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Subject: Re: Linux 5.14-rc1
To:     Linus Torvalds <torvalds@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
References: <CAHk-=wjB5XBk4obhMPfrU3mnOakV9VgHAYOo-ZGJnB2X0DnBWA@mail.gmail.com>
From:   Jon Masters <jcm@jonmasters.org>
Organization: World Organi{s,z}ation of Broken Dreams
Message-ID: <a9473821-1d53-0037-7590-aeaf8e85e72a@jonmasters.org>
Date:   Mon, 12 Jul 2021 03:08:14 -0400
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On 7/11/21 6:49 PM, Linus Torvalds wrote:
> You all know the drill by now. It's been the usual two weeks of merge
> window, and not it's closed, and 5.14-rc1 is out there.

I happened to be installing a Fedora 34 (x86) VM for something and did a 
test kernel compile that hung on boot. Setting up a serial console I get 
the below backtrace from ttm but I have not had chance to look at it.

Fedora 34 (Server Edition)
Kernel 5.14.0-rc1 on an x86_64 (ttyS0)

Web console: https://fedora:9090/ or https://192.168.1.91:9090/

fedora login: [   11.263539] BUG: kernel NULL pointer dereference, 
address: 0000000000000010
[   11.266355] #PF: supervisor read access in kernel mode
[   11.268409] #PF: error_code(0x0000) - not-present page
[   11.270456] PGD 0 P4D 0
[   11.271506] Oops: 0000 [#1] SMP PTI
[   11.272903] CPU: 1 PID: 41 Comm: kworker/1:1 Not tainted 5.14.0-rc1 #1
[   11.275488] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 
0.0.0 02/06/2015
[   11.278274] Workqueue: events ttm_device_delayed_workqueue [ttm]
[   11.279865] RIP: 0010:qxl_bo_delete_mem_notify+0x19/0x40 [qxl]
[   11.281404] Code: 89 e7 45 31 e4 e8 67 bf f6 dc eb ea 0f 1f 44 00 00 
0f 1f 44 00 00 55 48 89 fd e8 a2 02 00 00 84 c0 74 0d 48 8b 85 68 01 00 
00 <83> 78 10 03 74 02 5d c3 8b 85 64 02 00 00 85 c0 74 f4 48 8b 7d 08
[   11.286271] RSP: 0018:ffffb7a24017fdd0 EFLAGS: 00010202
[   11.287616] RAX: 0000000000000000 RBX: ffff9da7c08e8670 RCX: 
ffff9da7c0b30000
[   11.288978] RDX: ffff9da7c27f7990 RSI: ffff9da7c27f7990 RDI: 
ffff9da7c27f7800
[   11.290332] RBP: ffff9da7c27f7800 R08: ffff9da7c27f7990 R09: 
0000000000000000
[   11.291690] R10: ffff9da7c991ec00 R11: 0000000000000000 R12: 
ffff9da7c27f7990
[   11.293021] R13: ffff9da7c27f7800 R14: ffff9da7c27f7960 R15: 
ffff9da7c27f7990
[   11.294349] FS:  0000000000000000(0000) GS:ffff9da937c80000(0000) 
knlGS:0000000000000000
[   11.295853] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.296935] CR2: 0000000000000010 CR3: 000000010c178004 CR4: 
0000000000370ee0
[   11.298111] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   11.299120] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
[   11.300130] Call Trace:
[   11.300489]  ttm_bo_cleanup_memtype_use+0x22/0x60 [ttm]
[   11.301256]  ttm_bo_release+0x1a1/0x300 [ttm]
[   11.301879]  ttm_bo_delayed_delete+0x1be/0x220 [ttm]
[   11.302587]  ttm_device_delayed_workqueue+0x18/0x40 [ttm]
[   11.303358]  process_one_work+0x1ec/0x390
[   11.303941]  worker_thread+0x53/0x3e0
[   11.304464]  ? process_one_work+0x390/0x390
[   11.305066]  kthread+0x127/0x150
[   11.305535]  ? set_kthread_struct+0x40/0x40
[   11.306188]  ret_from_fork+0x22/0x30
[   11.306749] Modules linked in: nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 
nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct 
nft_chain_nat ip6table_nat ip6table_mangle ip6table_raw 
ip6table_security iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 
nf_defrag_ipv4 iptable_mangle iptable_raw iptable_security ip_set 
nf_tables rfkill nfnetlink ip6table_filter ip6_tables iptable_filter 
sunrpc vfat fat snd_hda_codec_generic intel_rapl_msr snd_hda_intel 
intel_rapl_common snd_intel_dspcfg snd_hda_codec isst_if_common 
snd_hwdep snd_hda_core iTCO_wdt intel_pmc_bxt iTCO_vendor_support 
kvm_intel snd_seq snd_seq_device snd_pcm kvm joydev irqbypass i2c_i801 
rapl i2c_smbus snd_timer snd virtio_balloon lpc_ich soundcore fuse zram 
ip_tables xfs qxl drm_ttm_helper ttm drm_kms_helper crct10dif_pclmul 
crc32_pclmul crc32c_intel cec drm ghash_clmulni_intel serio_raw 
virtio_blk qemu_fw_cfg virtio_net virtio_console net_failover failover 
pkcs8_key_parser
[   11.318215] CR2: 0000000000000010
[   11.318670] ---[ end trace 20fb2a3e9bc19a76 ]---
[   11.319300] RIP: 0010:qxl_bo_delete_mem_notify+0x19/0x40 [qxl]
[   11.320090] Code: 89 e7 45 31 e4 e8 67 bf f6 dc eb ea 0f 1f 44 00 00 
0f 1f 44 00 00 55 48 89 fd e8 a2 02 00 00 84 c0 74 0d 48 8b 85 68 01 00 
00 <83> 78 10 03 74 02 5d c3 8b 85 64 02 00 00 85 c0 74 f4 48 8b 7d 08
[   11.322574] RSP: 0018:ffffb7a24017fdd0 EFLAGS: 00010202
[   11.323271] RAX: 0000000000000000 RBX: ffff9da7c08e8670 RCX: 
ffff9da7c0b30000
[   11.324226] RDX: ffff9da7c27f7990 RSI: ffff9da7c27f7990 RDI: 
ffff9da7c27f7800
[   11.325186] RBP: ffff9da7c27f7800 R08: ffff9da7c27f7990 R09: 
0000000000000000
[   11.326145] R10: ffff9da7c991ec00 R11: 0000000000000000 R12: 
ffff9da7c27f7990
[   11.327092] R13: ffff9da7c27f7800 R14: ffff9da7c27f7960 R15: 
ffff9da7c27f7990
[   11.328032] FS:  0000000000000000(0000) GS:ffff9da937c80000(0000) 
knlGS:0000000000000000
[   11.329086] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   11.329848] CR2: 0000000000000010 CR3: 000000010c178004 CR4: 
0000000000370ee0
[   11.330810] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
[   11.331746] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400


-- 
Computer Architect