Received: by 2002:a05:6a10:c7c6:0:0:0:0 with SMTP id h6csp333249pxy; Sat, 31 Jul 2021 08:39:07 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy7wtOGz3to9GRtG0chQFGSw/Jx+dXDvL2PJgKtJwsgsCzU5+mcESd2pPRJlTG3BwNHpq6/ X-Received: by 2002:a17:907:2096:: with SMTP id pv22mr3453527ejb.443.1627745947025; Sat, 31 Jul 2021 08:39:07 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1627745947; cv=none; d=google.com; s=arc-20160816; b=MELD3YzygmwZX0d0qvudpsYbuYW2cueuZLv0lJjYLjJvA+HhlqrWNEJPVJghNO4zUa jf9sIsNxrtIeAhVh/Nf/nGx9liUi3bbuF6Nmz7gw8zEGfaYejG0gdRg9OzV65RQfbmPI d0ywyTXoD98qvw9/1KoA/gJ9RDago+0sQNhlPsUZ0FqKGZLboTVCAuyp5svq0EUx0Hx1 3hym94c5e9aelDVVHNrMyFWO6glg2x13YJy4hvU5jCeQ16dD7Cy953Dskq1Kb8tBeP1y mD8J3NLwS9wW1xTfIyJDznjpnb5FKWTpyC8VBRBj/InJAYEC08dCXlBqFk899q3utHFx OhBw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:content-disposition :mime-version:user-agent:in-reply-to:references:subject:cc:to:from :message-id:date; bh=VKx4CS37XMmCGtpI4HH8ES1p3i26phfZHRxjBJ+tF5c=; b=bjBUzZd2mOVheiRcy4Wx4J1TQdgLrpZYv2V6NI80qHRuZ1HP6s/1ww5bCdWUee0jqd S+UyVXML7J7dFX//CTC7pBaI20krlPd9BHaB1GorxgxpcfXLp22FkyKl4Ny0yZnSYoFL dQdr3eFF+AJXCX3grcATpDI3P6wSys9lsgTqy0iNY4g6NL9ZHrJ0zt8DT/Q41Y2tjjQE 6XwvEda8pBplXEvA76pdJkYB9hz7+G/OkQvnEue29ZhEWTPH5/BiACILMxwafy+CoJDo tjk+BLTvqJqunYscIH8I9QKf/XHPW/aRtgQ0DelACIaYEN/bIqTev1NgL7E6MSCAnCgd bCSQ== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id j23si5566902eje.21.2021.07.31.08.38.43; Sat, 31 Jul 2021 08:39:07 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233495AbhGaPgP convert rfc822-to-8bit (ORCPT + 99 others); Sat, 31 Jul 2021 11:36:15 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:48359 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233917AbhGaPel (ORCPT ); Sat, 31 Jul 2021 11:34:41 -0400 Received: from localhost (mailhub3.si.c-s.fr [192.168.12.233]) by localhost (Postfix) with ESMTP id 4GcSxN5MbjzB9xF; Sat, 31 Jul 2021 17:34:32 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id lz5QMw1alx1r; Sat, 31 Jul 2021 17:34:32 +0200 (CEST) Received: from vm-hermes.si.c-s.fr (vm-hermes.si.c-s.fr [192.168.25.253]) by pegase1.c-s.fr (Postfix) with ESMTP id 4GcSxN3sVmzB9wR; Sat, 31 Jul 2021 17:34:32 +0200 (CEST) Received: by vm-hermes.si.c-s.fr (Postfix, from userid 33) id 5C04610B; Sat, 31 Jul 2021 17:39:54 +0200 (CEST) Received: from 37-173-18-216.coucou-networks.fr (37-173-18-216.coucou-networks.fr [37.173.18.216]) by messagerie.c-s.fr (Horde Framework) with HTTP; Sat, 31 Jul 2021 17:39:54 +0200 Date: Sat, 31 Jul 2021 17:39:54 +0200 Message-ID: <20210731173954.Horde.fV2Xkw7-sxjG0DUcZ_JO_g3@messagerie.c-s.fr> From: Christophe Leroy To: Finn Thain Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Nick Piggin , Michael Ellerman , Paul Mackerras , Benjamin Herrenschmidt , Stan Johnson Subject: Re: [PATCH v3 31/41] powerpc/32: Dismantle EXC_XFER_STD/LITE/TEMPLATE References: <666e3ab4-372-27c2-4621-7cc3933756dd@linux-m68k.org> In-Reply-To: <666e3ab4-372-27c2-4621-7cc3933756dd@linux-m68k.org> User-Agent: Internet Messaging Program (IMP) H5 (6.2.3) Content-Type: text/plain; charset=UTF-8; format=flowed; DelSp=Yes MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 8BIT Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Finn Thain a écrit : > Hi Christophe, > > On Fri, 12 Mar 2021, Christophe Leroy wrote: > >> In order to get more control in exception prolog, dismantle all non >> standard exception macros, finishing with EXC_XFER_STD and EXC_XFER_LITE >> and EXC_XFER_TEMPLATE. >> >> Also remove transfer_to_handler_full and ret_from_except and >> ret_from_except_full as they are not used anymore. >> >> Last parameter of EXCEPTION() is now ignored, will be removed in a later >> patch to avoid too much churn. >> >> Signed-off-by: Christophe Leroy >> --- >> arch/powerpc/kernel/entry_32.S | 42 +----------------------- >> arch/powerpc/kernel/head_32.h | 21 ++++-------- >> arch/powerpc/kernel/head_40x.S | 33 ++++++++++++------- >> arch/powerpc/kernel/head_8xx.S | 12 +++++-- >> arch/powerpc/kernel/head_book3s_32.S | 27 ++++++++++----- >> arch/powerpc/kernel/head_booke.h | 49 +++++++++++++++------------- >> arch/powerpc/kernel/head_fsl_booke.S | 14 +++++--- >> 7 files changed, 92 insertions(+), 106 deletions(-) >> > > Stan Johnson contacted me about a regression in mainline that he observed > on his G3 Powerbooks. Using 'git bisect' we determined that this patch was > the cause of the regression, i.e. commit 4c0104a83fc3 ("powerpc/32: > Dismantle EXC_XFER_STD/LITE/TEMPLATE"). > > When testing 4c0104a83fc and all subsequent builds, various user processes > were liable to segfault. Here is the console log that Stan provided: Hi, i will be able to look at that more in details next week, however I have a few preliminary qurstions. Can you reliabily reproduce the problem with the said commit, and can you reliabily run without problem with the parent commit ? I'm asking because at first look that commit doesn't bring any functionnal change. Coukd you provide your .config ? Could you try without CONFIG_VMAP_STACK Thanks Christophe > > [ 0.000000] printk: debug: ignoring loglevel setting. > [ 0.000000] Total memory = 512MB; using 1024kB for hash table > [ 0.000000] Activating Kernel Userspace Execution Prevention > [ 0.000000] Activating Kernel Userspace Access Protection > [ 0.000000] Linux version 5.12.0-rc3-pmac-00067-g4c0104a83fc > (johnson@ThinkPad) (powerpc-linux-gnu-gcc (Debian 8.3.0-2) 8.3.0, > GNU ld (GNU Binutils for Debian) 2.31.1) #22 SMP Fri Jul 30 12:15:00 > MDT 2021 > [ 0.000000] ioremap() called early from > probe_one_macio+0x130/0x268. Use early_ioremap() instead > [ 0.000000] Found a Gatwick mac-io controller, rev: 0, mapped at > 0x(ptrval) > [ 0.000000] ioremap() called early from > probe_one_macio+0x130/0x268. Use early_ioremap() instead > [ 0.000000] Found a Heathrow mac-io controller, rev: 0, mapped at > 0x(ptrval) > [ 0.000000] PowerMac motherboard: PowerBook Wallstreet > [ 0.000000] ioremap() called early from find_via_pmu+0x244/0x56c. > Use early_ioremap() instead > [ 0.000000] PMU driver v2 initialized for PowerBook G3 Series, > firmware: 0a > [ 0.000000] Using PowerMac machine description > [ 0.000000] printk: bootconsole [udbg0] enabled > [ 0.000000] CPU maps initialized for 1 thread per core > [ 0.000000] (thread shift is 0) > [ 0.000000] ----------------------------------------------------- > [ 0.000000] phys_mem_size = 0x20000000 > [ 0.000000] dcache_bsize = 0x20 > [ 0.000000] icache_bsize = 0x20 > [ 0.000000] cpu_features = 0x000000000501a008 > [ 0.000000] possible = 0x00000000277de14a > [ 0.000000] always = 0x0000000001000000 > [ 0.000000] cpu_user_features = 0x8c000001 0x00000000 > [ 0.000000] mmu_features = 0x00000001 > [ 0.000000] Hash_size = 0x100000 > [ 0.000000] Hash_mask = 0x3fff > [ 0.000000] ----------------------------------------------------- > [ 0.000000] ioremap() called early from > pmac_setup_arch+0x10c/0x294. Use early_ioremap() instead > [ 0.000000] nvram: OF partition at 0x1800 > [ 0.000000] nvram: XP partition at 0x1300 > [ 0.000000] nvram: NR partition at 0x1400 > [ 0.000000] Top of RAM: 0x20000000, Total RAM: 0x20000000 > [ 0.000000] Memory hole size: 0MB > [ 0.000000] Zone ranges: > [ 0.000000] DMA [mem 0x0000000000000000-0x000000001fffffff] > [ 0.000000] Normal empty > [ 0.000000] HighMem empty > [ 0.000000] Movable zone start for each node > [ 0.000000] Early memory node ranges > [ 0.000000] node 0: [mem 0x0000000000000000-0x000000001fffffff] > [ 0.000000] Initmem setup node 0 [mem > 0x0000000000000000-0x000000001fffffff] > [ 0.000000] On node 0 totalpages: 131072 > [ 0.000000] DMA zone: 1024 pages used for memmap > [ 0.000000] DMA zone: 0 pages reserved > [ 0.000000] DMA zone: 131072 pages, LIFO batch:31 > [ 0.000000] percpu: Embedded 13 pages/cpu s21644 r8192 d23412 u53248 > [ 0.000000] pcpu-alloc: s21644 r8192 d23412 u53248 alloc=13*4096 > [ 0.000000] pcpu-alloc: [0] 0 [0] 1 > [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 130048 > [ 0.000000] Kernel command line: root=/dev/sda12 console=ttyS0 > console=tty printk.time earlyprintk ignore_loglevel video=ofonly > [ 0.000000] Dentry cache hash table entries: 65536 (order: 6, > 262144 bytes, linear) > [ 0.000000] Inode-cache hash table entries: 32768 (order: 5, > 131072 bytes, linear) > [ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off > [ 0.000000] Memory: 498908K/524288K available (6756K kernel code, > 352K rwdata, 1276K rodata, 1232K init, 176K bss, 25380K reserved, 0K > cma-reserved, 0K highmem) > [ 0.000000] Kernel virtual memory layout: > [ 0.000000] * 0xffbbf000..0xfffff000 : fixmap > [ 0.000000] * 0xff400000..0xff800000 : highmem PTEs > [ 0.000000] * 0xff2fd000..0xff400000 : early ioremap > [ 0.000000] * 0xe1000000..0xff2fd000 : vmalloc & ioremap > [ 0.000000] rcu: Hierarchical RCU implementation. > [ 0.000000] rcu: RCU calculated value of scheduler-enlistment > delay is 10 jiffies. > [ 0.000000] NR_IRQS: 512, nr_irqs: 512, preallocated irqs: 16 > [ 0.000000] irq: Found primary Apple PIC /pci/mac-io for 64 irqs > [ 0.000000] irq: Found slave Apple PIC /pci/mac-io for 64 irqs cascade: 27 > [ 0.000000] irq: System has 128 possible interrupts > [ 0.000000] GMT Delta read from XPRAM: -360 minutes, DST: on > [ 0.000000] random: get_random_u32 called from > start_kernel+0x36c/0x4d8 with crng_init=0 > [ 0.000000] time_init: decrementer frequency = 16.671650 MHz > [ 0.000000] time_init: processor frequency = 264.000000 MHz > [ 0.000038] clocksource: timebase: mask: 0xffffffffffffffff > max_cycles: 0x3d85178a6, max_idle_ns: 440795202430 ns > [ 0.000097] clocksource: timebase mult[3bfb68a3] shift[24] registered > [ 0.000201] clockevent: decrementer mult[44497e0] shift[32] cpu[0] > [ 0.001368] Console: colour dummy device 80x25 > [ 0.001436] printk: console [tty0] enabled > [ 0.001487] printk: bootconsole [udbg0] disabled > [ 0.001882] pmac_zilog: serial modem detected > [ 1.345729] printk: console [ttyS0] enabled > [ 1.358329] pid_max: default: 32768 minimum: 301 > [ 1.372599] Mount-cache hash table entries: 1024 (order: 0, 4096 > bytes, linear) > [ 1.394156] Mountpoint-cache hash table entries: 1024 (order: 0, > 4096 bytes, linear) > [ 1.422118] rcu: Hierarchical SRCU implementation. > [ 1.437119] smp: Bringing up secondary CPUs ... > [ 1.450268] smp: Brought up 1 node, 1 CPU > [ 1.463448] devtmpfs: initialized > [ 1.473485] Duplicate name in PowerPC,750, renamed to "l2-cache#1" > [ 1.494492] Duplicate name in pci, renamed to "mac-io#1" > [ 1.511648] Duplicate name in pci, renamed to "pccard#1" > [ 1.530211] Found Grackle (MPC106) PCI host bridge at > 0x0000000080000000. Firmware bus number: 0->0 > [ 1.556990] PCI host bridge /pci (primary) ranges: > [ 1.571383] IO 0x00000000fe000000..0x00000000fe7fffff -> > 0x0000000000000000 > [ 1.593309] MEM 0x00000000fd000000..0x00000000fdffffff -> > 0x0000000000000000 > [ 1.614579] MEM 0x0000000080000000..0x00000000fcffffff -> > 0x0000000080000000 > [ 1.637120] clocksource: jiffies: mask: 0xffffffff max_cycles: > 0xffffffff, max_idle_ns: 19112604462750000 ns > [ 1.667441] futex hash table entries: 512 (order: 2, 16384 bytes, linear) > [ 1.688431] NET: Registered protocol family 16 > [ 1.707910] PMU i2c /pci/mac-io/via-pmu > [ 1.722983] channel 1 bus > [ 1.733605] channel 2 bus > [ 1.746841] PCI: Probing PCI hardware > [ 1.761155] PCI host bridge to bus 0000:00 > [ 1.773432] pci_bus 0000:00: root bus resource [io 0x0000-0x7fffff] > [ 1.792247] pci_bus 0000:00: root bus resource [mem > 0xfd000000-0xfdffffff] (bus address [0x00000000-0x00ffffff]) > [ 1.822825] pci_bus 0000:00: root bus resource [mem 0x80000000-0xfcffffff] > [ 1.843419] pci_bus 0000:00: root bus resource [bus 00-ff] > [ 1.859881] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to ff > [ 1.879871] pci 0000:00:00.0: [1057:0002] type 00 class 0x060000 > [ 1.899189] pci 0000:00:0d.0: [106b:0017] type 00 class 0xff0000 > [ 1.916838] pci 0000:00:0d.0: reg 0x10: [mem 0xf4000000-0xf407ffff] > [ 1.936859] pci 0000:00:10.0: [106b:0017] type 00 class 0xff0000 > [ 1.954533] pci 0000:00:10.0: reg 0x10: [mem 0xf3000000-0xf307ffff] > [ 1.974637] pci 0000:00:11.0: [1002:4c50] type 00 class 0x038000 > [ 1.992312] pci 0000:00:11.0: reg 0x10: [mem 0x82000000-0x82ffffff] > [ 2.011110] pci 0000:00:11.0: reg 0x14: [io 0x0400-0x04ff] > [ 2.027818] pci 0000:00:11.0: reg 0x18: [mem 0x82fff000-0x82ffffff] > [ 2.046665] pci 0000:00:11.0: reg 0x30: [mem 0xfd000000-0xfd01ffff pref] > [ 2.066830] pci 0000:00:11.0: supports D1 D2 > [ 2.080778] pci 0000:00:13.0: [104c:ac15] type 02 class 0x060700 > [ 2.098478] pci 0000:00:13.0: reg 0x10: [mem 0x81803000-0x81803fff] > [ 2.118276] pci 0000:00:13.1: [104c:ac15] type 02 class 0x060700 > [ 2.135978] pci 0000:00:13.1: reg 0x10: [mem 0x81802000-0x81802fff] > [ 2.156532] pci_bus 0000:01: extended config space not accessible > [ 2.175227] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 04 > [ 2.195189] pci_bus 0000:05: extended config space not accessible > [ 2.213538] pci_bus 0000:05: busn_res: [bus 05-ff] end is updated to 08 > [ 2.233067] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 08 > [ 2.253708] PCI: Cannot allocate resource region 2 of device > 0000:00:11.0, will remap > [ 2.277131] PCI 0000:00 Cannot reserve Legacy IO [io 0x0000-0x0fff] > [ 2.296121] pci 0000:00:13.0: BAR 9: assigned [mem > 0x84000000-0x87ffffff pref] > [ 2.317651] pci 0000:00:13.0: BAR 10: assigned [mem 0x88000000-0x8bffffff] > [ 2.338269] pci 0000:00:13.1: BAR 9: assigned [mem > 0x8c000000-0x8fffffff pref] > [ 2.359955] pci 0000:00:13.1: BAR 10: assigned [mem 0x90000000-0x93ffffff] > [ 2.380606] pci 0000:00:11.0: BAR 6: assigned [mem > 0xfd000000-0xfd01ffff pref] > [ 2.402311] pci 0000:00:11.0: BAR 2: assigned [mem 0xfd020000-0xfd020fff] > [ 2.422704] pci 0000:00:13.0: BAR 7: assigned [io 0x1000-0x10ff] > [ 2.441000] pci 0000:00:13.0: BAR 8: assigned [io 0x1100-0x11ff] > [ 2.459300] pci 0000:00:13.1: BAR 7: assigned [io 0x1200-0x12ff] > [ 2.477600] pci 0000:00:13.1: BAR 8: assigned [io 0x1300-0x13ff] > [ 2.495919] pci 0000:00:13.0: CardBus bridge to [bus 01-04] > [ 2.512627] pci 0000:00:13.0: bridge window [io 0x1000-0x10ff] > [ 2.530925] pci 0000:00:13.0: bridge window [io 0x1100-0x11ff] > [ 2.549229] pci 0000:00:13.0: bridge window [mem > 0x84000000-0x87ffffff pref] > [ 2.570928] pci 0000:00:13.0: bridge window [mem 0x88000000-0x8bffffff] > [ 2.591320] pci 0000:00:13.1: CardBus bridge to [bus 05-08] > [ 2.608046] pci 0000:00:13.1: bridge window [io 0x1200-0x12ff] > [ 2.626349] pci 0000:00:13.1: bridge window [io 0x1300-0x13ff] > [ 2.644651] pci 0000:00:13.1: bridge window [mem > 0x8c000000-0x8fffffff pref] > [ 2.666350] pci 0000:00:13.1: bridge window [mem 0x90000000-0x93ffffff] > [ 2.686748] pci_bus 0000:00: resource 4 [io 0x0000-0x7fffff] > [ 2.703993] pci_bus 0000:00: resource 5 [mem 0xfd000000-0xfdffffff] > [ 2.722816] pci_bus 0000:00: resource 6 [mem 0x80000000-0xfcffffff] > [ 2.741641] pci_bus 0000:01: resource 0 [io 0x1000-0x10ff] > [ 2.758373] pci_bus 0000:01: resource 1 [io 0x1100-0x11ff] > [ 2.775105] pci_bus 0000:01: resource 2 [mem 0x84000000-0x87ffffff pref] > [ 2.795235] pci_bus 0000:01: resource 3 [mem 0x88000000-0x8bffffff] > [ 2.814059] pci_bus 0000:05: resource 0 [io 0x1200-0x12ff] > [ 2.830791] pci_bus 0000:05: resource 1 [io 0x1300-0x13ff] > [ 2.847523] pci_bus 0000:05: resource 2 [mem 0x8c000000-0x8fffffff pref] > [ 2.867653] pci_bus 0000:05: resource 3 [mem 0x90000000-0x93ffffff] > [ 3.004865] vgaarb: loaded > [ 3.015684] SCSI subsystem initialized > [ 3.028576] libata version 3.00 loaded. > [ 3.041525] usbcore: registered new interface driver usbfs > [ 3.058590] usbcore: registered new interface driver hub > [ 3.074722] usbcore: registered new device driver usb > [ 3.097574] clocksource: Switched to clocksource timebase > [ 3.176945] NET: Registered protocol family 2 > [ 3.196269] tcp_listen_portaddr_hash hash table entries: 512 > (order: 0, 6144 bytes, linear) > [ 3.221544] TCP established hash table entries: 4096 (order: 2, > 16384 bytes, linear) > [ 3.244755] TCP bind hash table entries: 4096 (order: 3, 32768 > bytes, linear) > [ 3.266467] TCP: Hash tables configured (established 4096 bind 4096) > [ 3.285534] UDP hash table entries: 256 (order: 1, 8192 bytes, linear) > [ 3.305032] UDP-Lite hash table entries: 256 (order: 1, 8192 > bytes, linear) > [ 3.326164] NET: Registered protocol family 1 > [ 3.339985] RPC: Registered named UNIX socket transport module. > [ 3.357356] RPC: Registered udp transport module. > [ 3.371459] RPC: Registered tcp transport module. > [ 3.385564] RPC: Registered tcp NFSv4.1 backchannel transport module. > [ 3.405111] PCI: CLS 32 bytes, default 32 > [ 3.418590] Thermal assist unit using workqueue, shrink_timer: 2000 ms > [ 3.444637] workingset: timestamp_bits=30 max_order=17 bucket_order=0 > [ 3.465435] squashfs: version 4.0 (2009/01/31) Phillip Lougher > [ 3.484342] Block layer SCSI generic (bsg) driver version 0.4 > loaded (major 253) > [ 3.506233] io scheduler mq-deadline registered > [ 3.521141] pci 0000:00:11.0: enabling device (0086 -> 0087) > [ 3.537885] Using unsupported 1024x768 (null) at 82801000, > depth=32, pitch=4096 > [ 3.682913] Console: switching to colour frame buffer device 128x48 > [ 3.823127] fb0: Open Firmware frame buffer device on /pci/ATY,RageLTPro > [ 3.845192] pmac_zilog: 0.6 (Benjamin Herrenschmidt > ) > [ 3.869499] Non-volatile memory driver v1.3 > [ 3.893598] brd: module loaded > [ 3.931206] loop: module loaded > [ 3.942363] MacIO PCI driver attached to Gatwick chipset > [ 3.959805] MacIO PCI driver attached to Heathrow chipset > [ 3.986647] swim3 0.00015000:floppy: [fd0] SWIM3 floppy > controller in media bay > [ 4.015851] 0.00013020:ch-a: ttyS0 at MMIO 0xf3013020 (irq = 16, > base_baud = 230400) is a Z85c30 ESCC - Serial port > [ 4.052300] 0.00013000:ch-b: ttyS1 at MMIO 0xf3013000 (irq = 17, > base_baud = 230400) is a Z85c30 ESCC - Infrared port > [ 4.090256] macio: fixed media-bay irq on gatwick > [ 4.107695] macio: fixed left floppy irqs > [ 4.121515] swim3 1.00015000:floppy: [fd1] Couldn't request interrupt > [ 4.142797] swim3: probe of 1.00015000:floppy failed with error -16 > [ 4.163133] macio: fixed left ide irqs > [ 4.175485] macio: fixed SCC irqs on gatwick > [ 4.189655] 1.00013020:ch-a: ttyS2 at MMIO 0xf4013020 (irq = 79, > base_baud = 230400) is a Z85c30 ESCC - Internal modem > [ 4.226442] mediabay0: Registered Heathrow media-bay > [ 4.455126] mediabay1: Registered Heathrow media-bay > [ 4.686271] PMU Backlight initialized (pmubl) > [ 4.703522] mesh: configured for synchronous 5 MB/s > [ 4.719262] mediabay1: Bay contains a floppy drive > [ 4.954580] mesh: performing initial bus reset... > [ 6.861383] random: fast init done > [ 6.976730] adb device [2]: 2 0xC3 > [ 7.044008] adb device [3]: 3 0x1 > [ 7.107927] adb device [7]: 7 0x1F > [ 7.181591] ADB keyboard at 2 has handler 0xC3 > [ 7.244084] Detected ADB keyboard, type ANSI. > [ 7.306604] input: ADB keyboard as /devices/virtual/input/input0 > [ 7.374680] input: ADB Powerbook buttons as /devices/virtual/input/input1 > [ 7.509364] ADB mouse (trackpad) at 3 has handler 0x4 > [ 7.573745] input: ADB mouse as /devices/virtual/input/input2 > [ 9.034624] scsi host0: MESH > [ 12.394536] pata-macio 0.00020000:ata0: Activating pata-macio > chipset Heathrow ATA, Apple bus ID 0 > [ 12.477627] scsi host1: pata_macio > [ 12.540331] ata1: PATA max MWDMA2 irq 30 > [ 12.795027] ata1.00: ATA-7: SAMSUNG HM100JC, YN100-08, max UDMA/100 > [ 12.865009] ata1.00: 195371568 sectors, multi 8: LBA48 > [ 12.935050] scsi 1:0:0:0: Direct-Access ATA SAMSUNG > HM100JC 0-08 PQ: 0 ANSI: 5 > [ 13.013610] sd 1:0:0:0: [sda] 195371568 512-byte logical blocks: > (100 GB/93.2 GiB) > [ 13.088556] sd 1:0:0:0: Attached scsi generic sg0 type 0 > [ 13.158582] sd 1:0:0:0: [sda] Write Protect is off > [ 13.223470] sd 1:0:0:0: [sda] Mode Sense: 00 3a 00 00 > [ 13.289075] sd 1:0:0:0: [sda] Write cache: disabled, read cache: > enabled, doesn't support DPO or FUA > [ 13.674503] pata-macio 0.00021000:ata1: Activating pata-macio > chipset Heathrow ATA, Apple bus ID 1 > [ 13.757042] scsi host2: pata_macio > [ 13.819249] ata2: PATA max MWDMA2 irq 36 > [ 13.904489] pata-macio 1.00021000:ata4: Activating pata-macio > chipset Heathrow ATA, Apple bus ID 4 > [ 13.983164] genirq: Flags mismatch irq 36. 00000000 > (pata-macio[1.00021000:ata4]) vs. 00000000 > (pata-macio[0.00021000:ata1]) > [ 14.070207] pata-macio: probe of 1.00021000:ata4 failed with error -16 > [ 14.479032] eth0: BMAC at 00:05:02:07:5a:a6 > [ 14.479077] > [ 14.615187] aoe: AoE v85 initialised. > [ 14.679798] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver > [ 14.753685] ehci-pci: EHCI PCI platform driver > [ 14.820303] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver > [ 14.893038] ohci-pci: OHCI PCI platform driver > [ 14.959871] usbcore: registered new interface driver uas > [ 15.029671] usbcore: registered new interface driver usb-storage > [ 15.104150] mousedev: PS/2 mouse device common for all mice > [ 15.178852] rtc-generic rtc-generic: registered as rtc0 > [ 15.248707] i2c /dev entries driver > [ 15.313358] PowerMac i2c bus pmu 2 registered > [ 15.379651] PowerMac i2c bus pmu 1 registered > [ 15.450539] usbcore: registered new interface driver usbhid > [ 15.517786] usbhid: USB HID core driver > [ 15.581161] sda: [mac] sda1 sda2 sda3 sda4 sda5 sda6 sda7 sda8 > sda9 sda10 sda11 sda12 sda13 sda14 sda15 > [ 15.682021] sd 1:0:0:0: [sda] Attached SCSI disk > [ 15.748688] NET: Registered protocol family 17 > [ 15.815278] drmem: No dynamic reconfiguration memory found > [ 15.905030] EXT4-fs (sda12): mounting ext3 file system using the > ext4 subsystem > [ 16.093352] EXT4-fs (sda12): mounted filesystem with ordered data > mode. Opts: (null). Quota mode: disabled. > [ 16.177770] VFS: Mounted root (ext3 filesystem) readonly on device 8:12. > [ 16.267681] Freeing unused kernel memory: 1232K > [ 16.337890] Kernel memory protection not selected by kernel config. > [ 16.413504] Run /sbin/init as init process > [ 16.481986] with arguments: > [ 16.546360] /sbin/init > [ 16.609020] earlyprintk > [ 16.671224] with environment: > [ 16.733922] HOME=/ > [ 16.792877] TERM=linux > [ 17.149488] BUG: Unable to handle kernel data access on read at 0x5071b5f4 > [ 17.222336] Faulting instruction address: 0xc0004194 > [ 17.289513] Oops: Kernel access of bad area, sig: 11 [#1] > [ 17.357646] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac > [ 17.426007] Modules linked in: > [ 17.485807] CPU: 0 PID: 1 Comm: init Not tainted > 5.12.0-rc3-pmac-00067-g4c0104a83fc #22 > [ 17.561902] NIP: c0004194 LR: c0004194 CTR: 00000000 > [ 17.629263] REGS: e1025e70 TRAP: 0300 Not tainted > (5.12.0-rc3-pmac-00067-g4c0104a83fc) > [ 17.707694] MSR: 00001032 CR: 40025f30 XER: 00000000 > [ 17.780835] DAR: 5071b5f4 DSISR: 40000000 > [ 17.780835] GPR00: 00000000 e1025f30 c14432e0 e1025f40 00000000 > 00000000 00000000 00000000 > [ 17.780835] GPR08: 00000000 0000d032 00000300 5071b53c c0000000 > 00000000 00000000 00000000 > [ 17.780835] GPR16: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 17.780835] GPR24: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 18.155821] NIP [c0004194] DataAccess_virt+0x8c/0xac > [ 18.218757] LR [c0004194] DataAccess_virt+0x8c/0xac > [ 18.281072] Call Trace: > [ 18.335751] [e1025f30] [c0004240] > InstructionAccess_virt+0x8c/0x90 (unreliable) > [ 18.407057] --- interrupt: 300 at 0xb780d500 > [ 18.468711] NIP: b780d500 LR: b7828554 CTR: 00000000 > [ 18.532657] REGS: e1025f40 TRAP: 0300 Not tainted > (5.12.0-rc3-pmac-00067-g4c0104a83fc) > [ 18.607221] MSR: 0000d032 CR: 00000000 > XER: 00000000 > [ 18.678419] DAR: bfcbfd50 DSISR: 42000000 > [ 18.678419] GPR00: 00000000 bfcc0010 00000000 bfcc0020 00000000 > 00000000 00000000 00000000 > [ 18.678419] GPR08: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 18.678419] GPR16: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 18.678419] GPR24: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 19.044798] NIP [b780d500] 0xb780d500 > [ 19.104645] LR [b7828554] 0xb7828554 > [ 19.164652] --- interrupt: 300 > [ 19.222524] Instruction dump: > [ 19.279658] 3d407265 394a6773 914b0008 39400300 914b00b0 906b001c > 908b0020 90ab0024 > [ 19.352049] 90cb0028 90eb002c 910b0030 4800fe71 <80ab00b8> > 74a00040 4082000c 48014f65 > [ 19.424682] ---[ end trace 88a2dc920b595dd1 ]--- > [ 19.487214] > [ 20.499171] Kernel panic - not syncing: Attempted to kill init! > exitcode=0x0000000b > [ 20.571365] Rebooting in 180 seconds.. > > > When testing a recent mainline build, 5.14.0-rc2-pmac-00323-gd8079fac1681, > PID 1 did not crash. Other processes crash instead and the kernel produces > messages like these: > > [ 91.150956] xfce4-session[1792]: segfault (11) at 404cd4fc nip > a6aed794 lr a6aed930 code 1 in libc-2.31.so[a6aa9000+1ce000] > [ 91.151194] xfce4-session[1792]: code: 2c170000 41820050 83f70004 > 3bb70008 57ff2036 3bfffff8 7ff7fa14 7c1df840 > [ 91.151233] xfce4-session[1792]: code: 41810028 60000000 60000000 > 41920150 <813f000c> 7c09d800 41820144 3bfffff0 > [ 115.700631] xfwm4[1978]: segfault (11) at 766d3243 nip a6c4af84 > lr a6e07724 code 1 in libc-2.31.so[a6c0b000+1ce000] > [ 115.700948] xfwm4[1978]: code: 60420000 8121000c 5069063e > 9121000c 60420000 c8010008 fdfe058e 38210010 > [ 115.700995] xfwm4[1978]: code: 4e800020 7c250b78 80c28ff4 > 7cc52a78 <90a30000> 7c0802a6 91c3000c d9c30058 > > > We found that reducing memory with the kernel parameter 'mem=464M' would > prevent the crash. > > Below are Stan's notes from the 'git bisect' run. They include an > additional failure mode that might be of interest. We've also observed > "Kernel attempted to write user page (c6207c) - exploit attempt?" and > "kernel BUG at arch/powerpc/kernel/interrupt.c:49!". > > > On Thu, 29 Jul 2021, Stanley J. Johnson wrote: > >> Here are the git bisect results (I saved the kernels and dmesg outputs >> in case they're needed later, though it's easy enough to re-create the >> results). >> >> We'll have up to two boots (only one if the first boot fails) for each >> kernel on WS-1 with the default memory setting of 512M. >> >> 1) 5.12.0-pmac-08447-g85f3f17b5db (good) >> -> works: no dmesg errs, X works >> -> works: no dmesg errs, X works >> >> 2) 5.12.0-pmac-12750-g23243c1ace9 (bad) >> (Crash and burn. I was tempted to mark this one "skip", since the errors >> are different, though we've seen them in earlier tests. So there could >> be multiple regressions. But let's keep chasing this one. I can re-run >> the bisect later and skip some failures if necessary.) >> -> fails: "Unable to contact settings server" after wdm login; dmesg errors: >> ... >> [ 127.169294] BUG: Unable to handle kernel instruction fetch (NULL >> pointer?) >> [ 127.169397] Faulting instruction address: 0x00000000 >> [ 127.169635] Oops: Kernel access of bad area, sig: 11 [#2] >> [ 127.169661] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 127.169696] Modules linked in: >> [ 127.169736] CPU: 0 PID: 1877 Comm: gdbus Tainted: G D >> 5.12.0-pmac-12750-g23243c1ace9 #9 >> [ 127.169776] NIP: 00000000 LR: 00000000 CTR: 00000000 >> ... >> >> 3) 5.12.0-rc7-pmac-02335-gaeacb52a8de (good) >> -> works: no dmesg errs, X works >> -> works: no dmesg errs, X works >> >> 4) 5.12.0-pmac-11585-g95275402f66 (bad) >> -> fails: dmesg errs, wdm login fails with "Unable to contact settings >> server..." >> ... >> [ 58.290883] BUG: Unable to handle kernel instruction fetch >> [ 58.291009] Faulting instruction address: 0x7cc903a4 >> [ 58.291240] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 58.291268] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 58.291305] Modules linked in: >> [ 58.291349] CPU: 0 PID: 1750 Comm: Xorg Not tainted >> 5.12.0-pmac-11585-g95275402f66 #11 >> [ 58.291391] NIP: 7cc903a4 LR: 7cc903a6 CTR: c0127eb8 >> [ 58.291417] REGS: e2da1e70 TRAP: 0400 Not tainted >> (5.12.0-pmac-11585-g95275402f66) >> [ 58.291450] MSR: 40001030 CR: 28008228 XER: 20000000 >> ... >> >> 5) 5.12.0-pmac-11068-g9d31d233895 (good) >> -> works: no dmesg errs, X works >> -> works: no dmesg errs, X works >> >> 6) 5.12.0-rc3-pmac-00258-ga9d2f9bb225 (bad) >> -> fails: wdm dies at login, screen hangs, dmesg errs that I haven't >> seen before: >> ... >> [ 59.988732] InputThread[1751]: bad frame in sys_rt_sigreturn: >> 51a79ab6 nip 001023c8 lr 001023c0 >> [ 62.079043] InputThread[1760]: bad frame in sys_rt_sigreturn: >> a98be235 nip 001023c8 lr 001023c0 >> [ 64.348063] InputThread[1776]: bad frame in sys_rt_sigreturn: >> a46b945e nip 001023c8 lr 001023c0 >> [ 66.413980] InputThread[1785]: bad frame in sys_rt_sigreturn: >> a98be235 nip 001023c8 lr 001023c0 >> [ 68.486768] InputThread[1794]: bad frame in sys_rt_sigreturn: >> 677e693b nip 001023c8 lr 001023c0 >> >> 7) 5.12.0-rc3-pmac-00129-g036fc2cb1dc (bad) >> -> fails: dmesg errs, wdm hangs (wdm did not crash, screen seems hung) >> ... >> [ 101.136941] BUG: Unable to handle kernel instruction fetch >> [ 101.137059] Faulting instruction address: 0xfea31f74 >> [ 101.137296] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 101.137323] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 101.137358] Modules linked in: >> [ 101.137401] CPU: 0 PID: 1882 Comm: xfce4-session Not tainted >> 5.12.0-rc3-pmac-00129-g036fc2cb1dc #14 >> [ 101.137443] NIP: fea31f74 LR: fea31f74 CTR: c00cfef4 >> [ 101.137470] REGS: e2e21e70 TRAP: 0400 Not tainted >> (5.12.0-rc3-pmac-00129-g036fc2cb1dc) >> [ 101.137502] MSR: 40001030 CR: 220084e8 XER: 00000000 >> ... >> >> 8) 5.12.0-rc3-pmac-00064-g719e7e212c7 (good) >> -> works: no dmesg errs, X works >> -> works: no dmesg errs, X works >> >> 9) 5.12.0-rc3-pmac-00096-ga2308836880 (bad) >> -> fails: dmesg errs, wdm hangs while validating login >> ... >> [ 104.559951] BUG: Unable to handle kernel instruction fetch >> [ 104.560086] Faulting instruction address: 0xfe988ba4 >> [ 104.560307] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 104.560337] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 104.560371] Modules linked in: >> [ 104.560415] CPU: 0 PID: 1834 Comm: xfce4-session Not tainted >> 5.12.0-rc3-pmac-00096-ga2308836880 #16 >> [ 104.560457] NIP: fe988ba4 LR: fe988ba4 CTR: c00cfee8 >> [ 104.560484] REGS: e2d9de70 TRAP: 0400 Not tainted >> (5.12.0-rc3-pmac-00096-ga2308836880) >> [ 104.560517] MSR: 40001030 CR: 220484e8 XER: 00000000 >> ... >> [ 114.371853] BUG: Unable to handle kernel instruction fetch >> [ 114.371998] Faulting instruction address: 0x3e62a270 >> [ 114.372270] Oops: Kernel access of bad area, sig: 11 [#2] >> [ 114.372298] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 114.372334] Modules linked in: >> [ 114.372382] CPU: 0 PID: 1858 Comm: xfwm4 Tainted: G D >> 5.12.0-rc3-pmac-00096-ga2308836880 #16 >> [ 114.372425] NIP: 3e62a270 LR: 3e62a271 CTR: c065eebc >> [ 114.372452] REGS: e2dede70 TRAP: 0400 Tainted: G D >> (5.12.0-rc3-pmac-00096-ga2308836880) >> [ 114.372486] MSR: 40001030 CR: 22002284 XER: 00000000 >> ... >> >> 10) 5.12.0-rc3-pmac-00080-g7a7d744ffe8 (bad) >> -> fails: dmesg errs, "Unable to contact settings server..." >> ... >> [ 170.622408] BUG: Unable to handle kernel instruction fetch >> [ 170.622546] Faulting instruction address: 0xfe9255d4 >> [ 170.622777] Oops: Kernel access of bad area, sig: 11 [#1] >> [ 170.622806] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 170.622841] Modules linked in: >> [ 170.622885] CPU: 0 PID: 1863 Comm: xfce4-session Not tainted >> 5.12.0-rc3-pmac-00080-g7a7d744ffe8 #17 >> [ 170.622927] NIP: fe9255d4 LR: fe9255d4 CTR: c00cfee8 >> [ 170.622954] REGS: e2da1e70 TRAP: 0400 Not tainted >> (5.12.0-rc3-pmac-00080-g7a7d744ffe8) >> [ 170.622987] MSR: 40001030 CR: 220484e8 XER: 00000000 >> ... >> [ 172.611235] BUG: Unable to handle kernel instruction fetch (NULL >> pointer?) >> [ 172.611364] Faulting instruction address: 0x00000000 >> [ 172.611662] Oops: Kernel access of bad area, sig: 11 [#2] >> [ 172.611690] BE PAGE_SIZE=4K MMU=Hash SMP NR_CPUS=2 PowerMac >> [ 172.611725] Modules linked in: >> [ 172.611773] CPU: 0 PID: 1871 Comm: gmain Tainted: G D >> 5.12.0-rc3-pmac-00080-g7a7d744ffe8 #17 >> [ 172.611814] NIP: 00000000 LR: 00000000 CTR: 00000000 >> [ 172.611840] REGS: e2db9e70 TRAP: 0400 Tainted: G D >> (5.12.0-rc3-pmac-00080-g7a7d744ffe8) >> [ 172.611874] MSR: 40001030 CR: 28008468 XER: 00000000 >> ... >> >> 11) 5.12.0-rc3-pmac-00072-ga2b3e09ae41 (bad) >> -> fails: kernel panic, I'd have to capture the output via a serial console >> >> 12) 5.12.0-rc3-pmac-00068-gacc142b6230 (bad) >> -> fails: kernel panic >> >> 13) 5.12.0-rc3-pmac-00066-g8f6ff5bd9b7 (good) >> -> works: no dmesg errs, X works >> -> works: no dmesg errs, X works >> >> 14) 5.12.0-rc3-pmac-00067-g4c0104a83fc (bad) >> -> fails: kernel panic >> >> The git bisect thinks this is the bad commit, but I'm not sure it means >> anything at all: >> >> ----- >> >> 4c0104a83fc3990a76a01a2f4e504251fa9814c4 is the first bad commit