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From:   Dmitry Vyukov <dvyukov@google.com>
Date:   Tue, 2 May 2023 12:51:26 +0200
Message-ID: <CACT4Y+av+kMfR+qC7yKd=wOAEBOAaOf2BE5jYX+HPhuiUsmVag@mail.gmail.com>
Subject: Re: [syzbot] upstream boot error: BUG: unable to handle kernel paging
 request in gpiod_set_raw_value_commit
To:     syzbot <syzbot+691fcab418631dee8be3@syzkaller.appspotmail.com>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>
Cc:     brgl@bgdev.pl, linus.walleij@linaro.org,
        linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
        syzkaller-bugs@googlegroups.com
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On Tue, 2 May 2023 at 11:52, syzbot
<syzbot+691fcab418631dee8be3@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    865fdb08197e Merge tag 'input-for-v6.4-rc0' of git://git.=
k..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=3D149ab84428000=
0
> kernel config:  https://syzkaller.appspot.com/x/.config?x=3Dd43eae746231f=
eb3
> dashboard link: https://syzkaller.appspot.com/bug?extid=3D691fcab418631de=
e8be3
> compiler:       arm-linux-gnueabi-gcc (Debian 10.2.1-6) 10.2.1 20210110, =
GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm
>
> IMPORTANT: if you fix the issue, please add the following tag to the comm=
it:
> Reported-by: syzbot+691fcab418631dee8be3@syzkaller.appspotmail.com

+arm mailing list

Kernel started falling apart on arm during boot in various strange ways.

#syz set subsystems: arm


> Movable zone start for each node
> Early memory node ranges
>   node   0: [mem 0x0000000080000000-0x00000000ffffffff]
> Initmem setup node 0 [mem 0x0000000080000000-0x00000000ffffffff]
> percpu: Embedded 19 pages/cpu s47048 r8192 d22584 u77824
> Kernel command line: root=3D/dev/vda console=3DttyAMA0  earlyprintk=3Dser=
ial net.ifnames=3D0 sysctl.kernel.hung_task_all_cpu_backtrace=3D1 ima_polic=
y=3Dtcb nf-conntrack-ftp.ports=3D20000 nf-conntrack-tftp.ports=3D20000 nf-c=
onntrack-sip.ports=3D20000 nf-conntrack-irc.ports=3D20000 nf-conntrack-sane=
.ports=3D20000 binder.debug_mask=3D0 rcupdate.rcu_expedited=3D1 rcupdate.rc=
u_cpu_stall_cputime=3D1 no_hash_pointers page_owner=3Don sysctl.vm.nr_hugep=
ages=3D4 sysctl.vm.nr_overcommit_hugepages=3D4 secretmem.enable=3D1 sysctl.=
max_rcu_stall_to_panic=3D1 msr.allow_writes=3Doff coredump_filter=3D0xffff =
root=3D/dev/vda console=3DttyAMA0 vmalloc=3D512M smp.csd_lock_timeout=3D300=
000 watchdog_thresh=3D165 workqueue.watchdog_thresh=3D420 sysctl.net.core.n=
etdev_unregister_timeout_secs=3D420 dummy_hcd.num=3D2 panic_on_warn=3D1
> Unknown kernel command line parameters "earlyprintk=3Dserial page_owner=
=3Don", will be passed to user space.
> Dentry cache hash table entries: 262144 (order: 8, 1048576 bytes, linear)
> Inode-cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
> Built 1 zonelists, mobility grouping on.  Total pages: 520868
> allocated 2097152 bytes of page_ext
> mem auto-init: stack:off, heap alloc:on, heap free:off
> software IO TLB: area num 2.
> software IO TLB: mapped [mem 0x00000000d9a47000-0x00000000dda47000] (64MB=
)
> Memory: 1952316K/2097152K available (24576K kernel code, 2364K rwdata, 84=
04K rodata, 2048K init, 868K bss, 128452K reserved, 16384K cma-reserved, 52=
4288K highmem)
> SLUB: HWalign=3D64, Order=3D0-3, MinObjects=3D0, CPUs=3D2, Nodes=3D1
> trace event string verifier disabled
> rcu: Preemptible hierarchical RCU implementation.
> rcu:    RCU restricting CPUs from NR_CPUS=3D8 to nr_cpu_ids=3D2.
> rcu:    RCU callback double-/use-after-free debug is enabled.
>         All grace periods are expedited (rcu_expedited).
>         Trampoline variant of Tasks RCU enabled.
>         Tracing variant of Tasks RCU enabled.
> rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
> rcu: Adjusting geometry for rcu_fanout_leaf=3D16, nr_cpu_ids=3D2
> NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
> GIC physical location is 0x2c001000
> rcu: srcu_init: Setting srcu_struct sizes based on contention.
> sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
> clocksource: arm,sp804: mask: 0xffffffff max_cycles: 0xffffffff, max_idle=
_ns: 1911260446275 ns
> arch_timer: cp15 timer(s) running at 62.50MHz (virt).
> clocksource: arch_sys_counter: mask: 0x1ffffffffffffff max_cycles: 0x1cd4=
2e208c, max_idle_ns: 881590405314 ns
> sched_clock: 57 bits at 63MHz, resolution 16ns, wraps every 4398046511096=
ns
> Switching to timer-based delay loop, resolution 16ns
> Console: colour dummy device 80x30
> Calibrating delay loop (skipped), value calculated using timer frequency.=
. 125.00 BogoMIPS (lpj=3D625000)
> pid_max: default: 32768 minimum: 301
> LSM: initializing lsm=3Dlockdown,capability,landlock,yama,safesetid,tomoy=
o,selinux,bpf,integrity
> landlock: Up and running.
> Yama: becoming mindful.
> TOMOYO Linux initialized
> SELinux:  Initializing.
> LSM support for eBPF active
> stackdepot: allocating hash table of 131072 entries via kvcalloc
> Mount-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
> Mountpoint-cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
> CPU: Testing write buffer coherency: ok
> CPU0: Spectre BHB: enabling loop workaround for all CPUs
> CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
> 8<--- cut here ---
> Unable to handle kernel paging request at virtual address 831b70d8 when e=
xecute
> [831b70d8] *pgd=3D80000080006003, *pmd=3D4000008300071d(bad)
> Internal error: Oops: 8000020e [#1] PREEMPT SMP ARM
> Modules linked in:
> CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.3.0-syzkaller #0
> Hardware name: ARM-Versatile Express
> PC is at 0x831b70d8
> LR is at gpiod_set_raw_value_commit+0x4c/0x168 drivers/gpio/gpiolib.c:303=
0
> pc : [<831b70d8>]    lr : [<80890618>]    psr: 40000113
> sp : df85de90  ip : df85dec0  fp : df85debc
> r10: 00000000  r9 : 827e16e6  r8 : 00000001
> r7 : 831b7040  r6 : 00000001  r5 : 840b67bc  r4 : 00000003
> r3 : 831b70d8  r2 : 00000001  r1 : 00000003  r0 : 831b7040
> Flags: nZcv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none
> Control: 30c5387d  Table: 8470bd40  DAC: 00000000
> Register r0 information: slab kmalloc-512 start 831b7000 pointer offset 6=
4 size 512
> Register r1 information: non-paged memory
> Register r2 information: non-paged memory
> Register r3 information: slab kmalloc-512 start 831b7000 pointer offset 2=
16 size 512
> Register r4 information: non-paged memory
> Register r5 information: slab kmalloc-192 start 840b6780 pointer offset 6=
0 size 192
> Register r6 information: non-paged memory
> Register r7 information: slab kmalloc-512 start 831b7000 pointer offset 6=
4 size 512
> Register r8 information: non-paged memory
> Register r9 information: non-slab/vmalloc memory
> Register r10 information: NULL pointer
> Register r11 information: non-paged memory
> Register r12 information: non-paged memory
> Process swapper/1 (pid: 0, stack limit =3D 0xdf85c000)
> Stack: (0xdf85de90 to 0xdf85e000)
> de80:                                     00000003 840b67bc 00000001 0000=
00ff
> dea0: ddde4798 00000001 827e16e6 00000000 df85decc df85dec0 80890ca8 8089=
05d8
> dec0: df85dee4 df85ded0 80891a3c 80890c60 8301daa8 000000ff df85defc df85=
dee8
> dee0: 8107f408 808919f8 8301daa8 000000ff df85df0c df85df00 8107d838 8107=
f3b8
> df00: df85df24 df85df10 8107db84 8107d80c 8301daa8 840ebb94 df85df44 df85=
df28
> df20: 8107ea20 8107db2c 000001fd 8290cee4 00000002 ddde4798 df85df6c df85=
df48
> df40: 8107fde8 8107e9f4 00000001 8260c498 831f4680 8260c4e0 00000000 827e=
16e6
> df60: df85df7c df85df70 80208efc 8107fd44 df85dfc4 df85df80 80293568 8020=
8ef4
> df80: 8029e3c8 818015a4 81f860a0 824af2f8 5b935000 0f6c3d28 df85dfc4 0000=
0097
> dfa0: 00000001 831f4680 82850464 80003010 412fc0f1 00000000 df85dfd4 df85=
dfc8
> dfc0: 80293af8 802934f8 df85dff4 df85dfd8 80210374 80293ae4 830e0a00 0000=
0000
> dfe0: 30c0387d 82850464 00000000 df85dff8 802016f4 80210254 00000000 0000=
0000
> Backtrace:
> [<808905cc>] (gpiod_set_raw_value_commit) from [<80890ca8>] (gpiod_set_va=
lue_nocheck+0x54/0x58 drivers/gpio/gpiolib.c:3204)
>  r10:00000000 r9:827e16e6 r8:00000001 r7:ddde4798 r6:000000ff r5:00000001
>  r4:840b67bc r3:00000003
> [<80890c54>] (gpiod_set_value_nocheck) from [<80891a3c>] (gpiod_set_value=
+0x50/0xc0 drivers/gpio/gpiolib.c:3223)
> [<808919ec>] (gpiod_set_value) from [<8107f408>] (gpio_led_set+0x5c/0x60 =
drivers/leds/leds-gpio.c:54)
>  r5:000000ff r4:8301daa8
> [<8107f3ac>] (gpio_led_set) from [<8107d838>] (__led_set_brightness drive=
rs/leds/led-core.c:47 [inline])
> [<8107f3ac>] (gpio_led_set) from [<8107d838>] (led_set_brightness_nopm dr=
ivers/leds/led-core.c:271 [inline])
> [<8107f3ac>] (gpio_led_set) from [<8107d838>] (led_set_brightness_nosleep=
+0x38/0x5c drivers/leds/led-core.c:287)
>  r5:000000ff r4:8301daa8
> [<8107d800>] (led_set_brightness_nosleep) from [<8107db84>] (led_set_brig=
htness+0x64/0x68 drivers/leds/led-core.c:264)
> [<8107db20>] (led_set_brightness) from [<8107ea20>] (led_trigger_event dr=
ivers/leds/led-triggers.c:390 [inline])
> [<8107db20>] (led_set_brightness) from [<8107ea20>] (led_trigger_event+0x=
38/0x50 drivers/leds/led-triggers.c:380)
>  r5:840ebb94 r4:8301daa8
> [<8107e9e8>] (led_trigger_event) from [<8107fde8>] (ledtrig_cpu+0xb0/0x10=
0 drivers/leds/trigger/ledtrig-cpu.c:86)
>  r7:ddde4798 r6:00000002 r5:8290cee4 r4:000001fd
> [<8107fd38>] (ledtrig_cpu) from [<80208efc>] (arch_cpu_idle_exit+0x14/0x1=
8 arch/arm/kernel/process.c:98)
>  r9:827e16e6 r8:00000000 r7:8260c4e0 r6:831f4680 r5:8260c498 r4:00000001
> [<80208ee8>] (arch_cpu_idle_exit) from [<80293568>] (do_idle+0x7c/0x2f0 k=
ernel/sched/idle.c:284)
> [<802934ec>] (do_idle) from [<80293af8>] (cpu_startup_entry+0x20/0x24 ker=
nel/sched/idle.c:379)
>  r10:00000000 r9:412fc0f1 r8:80003010 r7:82850464 r6:831f4680 r5:00000001
>  r4:00000097
> [<80293ad8>] (cpu_startup_entry) from [<80210374>] (secondary_start_kerne=
l+0x12c/0x188 arch/arm/kernel/smp.c:482)
> [<80210248>] (secondary_start_kernel) from [<802016f4>] (__enable_mmu+0x0=
/0xc arch/arm/kernel/head.S:438)
>  r7:82850464 r6:30c0387d r5:00000000 r4:830e0a00
> Code: 831b710c 831b70d8 80216664 802160d0 (00000000)
> ---[ end trace 0000000000000000 ]---
> ----------------
> Code disassembly (best guess):
>    0:   831b710c        tsthi   fp, #12, 2
>    4:   831b70d8        tsthi   fp, #216        ; 0xd8
>    8:   80216664        eorhi   r6, r1, r4, ror #12
>    c:   802160d0        ldrdhi  r6, [r1], -r0   ; <UNPREDICTABLE>
> * 10:   00000000        andeq   r0, r0, r0 <-- trapping instruction
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
>
> If the bug is already fixed, let syzbot know by replying with:
> #syz fix: exact-commit-title
>
> If you want to change bug's subsystems, reply with:
> #syz set subsystems: new-subsystem
> (See the list of subsystem names on the web dashboard)
>
> If the bug is a duplicate of another bug, reply with:
> #syz dup: exact-subject-of-another-report
>
> If you want to undo deduplication, reply with:
> #syz undup
>
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