bisecting fixing commit since dcc5c6f013d841e9ae74d527d312d512dfc2e2f0
building syzkaller on d5a3ae1f760e7cb2cd5a721d9645ae22eae114fe
testing commit dcc5c6f013d841e9ae74d527d312d512dfc2e2f0 with gcc (GCC) 8.1.0
kernel signature: 612d2a519473ebd149738f4ddd9f818cdbaaa6db30fb87dbb4bac992464546b1
run #0: crashed: WARNING in timer_wait_running
run #1: crashed: WARNING in timer_wait_running
run #2: crashed: WARNING in timer_wait_running
run #3: crashed: WARNING in timer_wait_running
run #4: OK
run #5: OK
run #6: OK
run #7: crashed: WARNING in timer_wait_running
run #8: OK
run #9: OK
testing current HEAD 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d
testing commit 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d with gcc (GCC) 8.1.0
kernel signature: 76deceeb0010b9ec441ff023b6aeaea38f8623d570b4ae23412c5fb640f017b3
run #0: crashed: WARNING in timer_wait_running
run #1: crashed: WARNING in timer_wait_running
run #2: crashed: WARNING in timer_wait_running
run #3: crashed: WARNING in timer_wait_running
run #4: crashed: WARNING in timer_wait_running
run #5: crashed: WARNING in timer_wait_running
run #6: crashed: WARNING in timer_wait_running
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 33m48.322065655s (build: 11m6.580334884s, test: 22m0.767837736s)
the crash still happens on HEAD
commit msg: Merge tag 'task_work-2021-01-19' of git://git.kernel.dk/linux-block
crash: WARNING in timer_wait_running
------------[ cut here ]------------
WARNING: CPU: 0 PID: 771 at kernel/time/posix-timers.c:849 rcu_read_lock include/linux/rcupdate.h:649 [inline]
WARNING: CPU: 0 PID: 771 at kernel/time/posix-timers.c:849 timer_wait_running+0x10f/0x120 kernel/time/posix-timers.c:846
Modules linked in:
CPU: 0 PID: 771 Comm: syz-executor263 Not tainted 5.11.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:timer_wait_running+0x10f/0x120 kernel/time/posix-timers.c:849
Code: 0f 85 6a ff ff ff 48 c7 c2 20 b2 e9 83 be 8a 02 00 00 48 c7 c7 50 af e9 83 c6 05 e9 e9 65 03 01 e8 de 2d db 01 e9 46 ff ff ff <0f> 0b e9 5d ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 41 54 55 53 48
RSP: 0018:ffffc900020ebe58 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff888114062af8 RCX: 0000000000000001
RDX: 0000000000000001 RSI: ffffffff83f4152b RDI: 00000000ffffffff
RBP: ffffc900020ebe78 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: ffffffff8362ea40 R14: ffffc900020ebe90 R15: 0000000000000000
FS:  00007fd8e1bfc700(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd8e1bdae78 CR3: 000000010b5ae005 CR4: 00000000001706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_timer_settime+0xc1/0x120 kernel/time/posix-timers.c:929
 __do_sys_timer_settime kernel/time/posix-timers.c:952 [inline]
 __se_sys_timer_settime kernel/time/posix-timers.c:938 [inline]
 __x64_sys_timer_settime+0x6b/0xd0 kernel/time/posix-timers.c:938
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x4468e9
Code: e8 5c b3 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 8b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd8e1bfbdb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000df
RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004468e9
RDX: 0000000020000300 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
R13: 00007ffd17d061ff R14: 00007fd8e1bfc9c0 R15: 20c49ba5e353f7cf