INFO: task hung in snd_pcm_oss_write

[syzbot]

Hello,

syzkaller hit the following crash on
cf1fb158230edce8a0482bfb2e59b9c390477fb6
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
Unfortunately, I don't have any reproducer for this bug yet.
CC: [alsa-...@alsa-project.org linux-...@vger.kernel.org
mi...@kernel.org o-ta...@sakamocchi.jp pe...@perex.cz ti...@suse.com]

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d6e4de...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for
details.
If you forward the report, please keep this part and the footer.

INFO: task syz-executor1:11180 blocked for more than 120 seconds.
Not tainted 4.15.0-rc7+ #256
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D24192 11180 3731 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2799 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3375
schedule+0xf5/0x430 kernel/sched/core.c:3434
schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3492
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1338 [inline]
snd_pcm_oss_write+0x22d/0x830 sound/core/oss/pcm_oss.c:2646
do_loop_readv_writev fs/read_write.c:676 [inline]
do_iter_write+0x3ca/0x540 fs/read_write.c:934
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007fca929efc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9
RDX: 0000000000000005 RSI: 0000000020d30fb0 RDI: 0000000000000014
RBP: 00000000000003aa R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3890
R13: 00000000ffffffff R14: 00007fca929f06d4 R15: 0000000000000005

Showing all locks held in the system:
2 locks held by khungtaskd/737:
#0: (rcu_read_lock){....}, at: [<00000000eaa2e968>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000eaa2e968>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<000000005ed461f9>]
debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4464
2 locks held by getty/3468:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3469:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3470:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3471:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3472:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3473:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3474:
#0: (&tty->ldisc_sem){++++}, at: [<000000000ce218db>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<0000000093a88874>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor1/11180:
#0: (&runtime->oss.params_lock){+.+.}, at: [<0000000025c7b14d>]
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1338 [inline]
#0: (&runtime->oss.params_lock){+.+.}, at: [<0000000025c7b14d>]
snd_pcm_oss_write+0x22d/0x830 sound/core/oss/pcm_oss.c:2646
1 lock held by syz-executor3/11468:
#0: (net_mutex){+.+.}, at: [<0000000012aa0ea7>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor5/11495:
#0: (net_mutex){+.+.}, at: [<0000000012aa0ea7>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor0/11515:
#0: (net_mutex){+.+.}, at: [<0000000012aa0ea7>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 737 Comm: khungtaskd Not tainted 4.15.0-rc7+ #256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11167 Comm: syz-executor1 Not tainted 4.15.0-rc7+ #256
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:check_kcov_mode kernel/kcov.c:67 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x1a/0x50 kernel/kcov.c:101
RSP: 0018:ffff8801cfeb77d0 EFLAGS: 00000246
RAX: ffff8801cb2c23c0 RBX: ffffc900012ff9c5 RCX: 0000000000000007
RDX: 0000000000000000 RSI: ffffc900020b7000 RDI: ffffc9000126438a
RBP: ffff8801cfeb77d0 R08: fffff5200024c872 R09: fffff5200024c872
R10: 0000000000000001 R11: fffff5200024c871 R12: 0000000000007e00
R13: ffff8801d8a3a900 R14: dffffc0000000000 R15: ffffc9000126438a
FS: 00007fca92a11700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020eef000 CR3: 00000001d477e002 CR4: 00000000001606e0
Call Trace:
ulaw2linear sound/core/oss/mulaw.c:134 [inline]
mulaw_decode+0x5aa/0x770 sound/core/oss/mulaw.c:194
mulaw_transfer+0x222/0x270 sound/core/oss/mulaw.c:273
snd_pcm_plug_write_transfer+0x22d/0x420 sound/core/oss/pcm_plugin.c:611
snd_pcm_oss_write2+0x260/0x420 sound/core/oss/pcm_oss.c:1311
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1372 [inline]
snd_pcm_oss_write+0x5fe/0x830 sound/core/oss/pcm_oss.c:2646
do_loop_readv_writev fs/read_write.c:676 [inline]
do_iter_write+0x3ca/0x540 fs/read_write.c:934
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9
RSP: 002b:00007fca92a10c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007fca92a11700 RCX: 0000000000452ac9
RDX: 0000000000000005 RSI: 0000000020d30fb0 RDI: 0000000000000014
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007fca92a119c0 R15: 0000000000000000
Code: e9 c3 fc ff ff 90 90 90 90 90 90 90 90 90 90 90 90 55 65 48 8b 04 25
c0 ed 01 00 48 89 e5 65 8b 15 bc d5 91 7e 81 e2 00 01 1f 00 <48> 8b 4d 08
75 2b 8b 90 b8 12 00 00 83 fa 02 75 20 48 8b b0 c0


---
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[syzbot]

syzkaller has found reproducer for the following crash on

cf1fb158230edce8a0482bfb2e59b9c390477fb6
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.

syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers

CC: [alsa-...@alsa-project.org linux-...@vger.kernel.org
mi...@kernel.org o-ta...@sakamocchi.jp pe...@perex.cz ti...@suse.com]

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d6e4de...@syzkaller.appspotmail.com
It will help syzbot understand when the bug is fixed.

INFO: task syz-executor3:3522 blocked for more than 120 seconds.

Not tainted 4.15.0-rc7+ #256
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.

syz-executor3 D24272 3522 3509 0x00000004

Call Trace:
context_switch kernel/sched/core.c:2799 [inline]
__schedule+0x8eb/0x2060 kernel/sched/core.c:3375
schedule+0xf5/0x430 kernel/sched/core.c:3434
schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3492
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1338 [inline]
snd_pcm_oss_write+0x22d/0x830 sound/core/oss/pcm_oss.c:2646
do_loop_readv_writev fs/read_write.c:676 [inline]
do_iter_write+0x3ca/0x540 fs/read_write.c:934
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9

RSP: 002b:00007f71e06cbc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000014

RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452ac9

RDX: 0000000000000005 RSI: 0000000020d30fb0 RDI: 0000000000000000

RBP: 00000000000003aa R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3890

R13: 00000000ffffffff R14: 00007f71e06cc6d4 R15: 0000000000000000

Showing all locks held in the system:

3 locks held by kworker/u4:1/21:
#0: ((wq_completion)"%s""netns"){+.+.}, at: [<000000009d8b7ab1>]
process_one_work+0xaaf/0x1b10 kernel/workqueue.c:2083
#1: (net_cleanup_work){+.+.}, at: [<0000000057b0e500>]
process_one_work+0xb01/0x1b10 kernel/workqueue.c:2087
#2: (net_mutex){+.+.}, at: [<00000000272d2639>] cleanup_net+0x247/0xb50
net/core/net_namespace.c:450
2 locks held by khungtaskd/738:
#0: (rcu_read_lock){....}, at: [<00000000d3caa368>]
check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000d3caa368>] watchdog+0x1c5/0xd60
kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000ad265c79>]
debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4464
2 locks held by getty/3465:
#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3466:
#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3467:
#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131

2 locks held by getty/3468:

#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]

n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3469:

#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]

n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3470:

#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]

n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
2 locks held by getty/3471:

#0: (&tty->ldisc_sem){++++}, at: [<000000000cbb9a4f>]
ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000751be7e4>]
n_tty_read+0x2ef/0x1a00 drivers/tty/n_tty.c:2131
1 lock held by syz-executor3/3522:
#0: (&runtime->oss.params_lock){+.+.}, at: [<00000000b64538d3>]
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1338 [inline]
#0: (&runtime->oss.params_lock){+.+.}, at: [<00000000b64538d3>]
snd_pcm_oss_write+0x22d/0x830 sound/core/oss/pcm_oss.c:2646
1 lock held by syz-executor1/3534:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor2/3536:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor7/3538:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor0/3540:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor5/3542:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor6/3543:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410
1 lock held by syz-executor4/3545:
#0: (net_mutex){+.+.}, at: [<00000000a3f02c40>] copy_net_ns+0x239/0x580
net/core/net_namespace.c:410

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 738 Comm: khungtaskd Not tainted 4.15.0-rc7+ #256

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:524

Sending NMI from CPU 1 to CPUs 0:

NMI backtrace for cpu 0

CPU: 0 PID: 3521 Comm: syz-executor3 Not tainted 4.15.0-rc7+ #256

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011

RIP: 0010:memcpy_erms+0x8/0x10 arch/x86/lib/memcpy_64.S:54
RSP: 0018:ffff8801bfa1f7b0 EFLAGS: 00000246
RAX: ffffc900017899ec RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffff8801bfa1f8a2 RDI: ffffc900017899ee
RBP: ffff8801bfa1f7d0 R08: fffff520002f133e R09: fffff520002f133e
R10: 0000000000000001 R11: fffff520002f133d R12: ffffc900017899ec
R13: ffff8801bfa1f8a0 R14: dffffc0000000000 R15: ffffc900017899ec
FS: 00007f71e06ed700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020e1e000 CR3: 00000001c1252005 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
memcpy include/linux/string.h:344 [inline]
cvt_s16_to_native sound/core/oss/mulaw.c:164 [inline]
mulaw_decode+0x52f/0x770 sound/core/oss/mulaw.c:195

mulaw_transfer+0x222/0x270 sound/core/oss/mulaw.c:273
snd_pcm_plug_write_transfer+0x22d/0x420 sound/core/oss/pcm_plugin.c:611
snd_pcm_oss_write2+0x260/0x420 sound/core/oss/pcm_oss.c:1311
snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1372 [inline]
snd_pcm_oss_write+0x5fe/0x830 sound/core/oss/pcm_oss.c:2646
do_loop_readv_writev fs/read_write.c:676 [inline]
do_iter_write+0x3ca/0x540 fs/read_write.c:934
vfs_writev+0x18a/0x340 fs/read_write.c:977
do_writev+0xfc/0x2a0 fs/read_write.c:1012
SYSC_writev fs/read_write.c:1085 [inline]
SyS_writev+0x27/0x30 fs/read_write.c:1082
entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x452ac9

RSP: 002b:00007f71e06ecc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452ac9
RDX: 0000000000000005 RSI: 0000000020d30fb0 RDI: 0000000000000000
RBP: 00000000000003cf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3c08
R13: 00000000ffffffff R14: 00007f71e06ed6d4 R15: 0000000000000000
Code: 90 90 90 eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48
a5 89 d1 f3 a4 c3 66 0f 1f 44 00 00 48 89 f8 48 89 d1 f3 a4 <c3> 0f 1f 80
00 00 00 00 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c

[Dmitry Vyukov]

#syz fix: ALSA: pcm: Abort properly at pending signal in OSS read/write loops

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> https://groups.google.com/d/msgid/syzkaller-upstream-moderation/001a113dede4ba339f056272b4f9%40google.com.
>
> For more options, visit https://groups.google.com/d/optout.