bisecting fixing commit since dda0e2920330128e0dbdeb11c8f25031aa40b11c
building syzkaller on 17a986e54c507287c078a70fa9eea0be9f191f84
testing commit dda0e2920330128e0dbdeb11c8f25031aa40b11c with gcc (GCC) 8.1.0
kernel signature: 675ebd8bab8c0b1f2c4ce47a8362526ba917335dc76883144b71632b06def68b
run #0: crashed: WARNING in cancel_delayed_work_sync
run #1: crashed: WARNING in corrupted
run #2: crashed: WARNING in pm_qos_remove_request
run #3: crashed: BUG: unable to handle kernel paging request in pm_qos_update_target
run #4: crashed: WARNING in cancel_delayed_work_sync
run #5: crashed: BUG: unable to handle kernel paging request in pm_qos_update_target
run #6: crashed: WARNING in cancel_delayed_work_sync
run #7: crashed: WARNING in cancel_delayed_work_sync
run #8: crashed: WARNING in pm_qos_remove_request
run #9: crashed: general protection fault in pm_qos_update_target
testing current HEAD 3fc898571b974f9a05e4e5c1fe17b18548207091
testing commit 3fc898571b974f9a05e4e5c1fe17b18548207091 with gcc (GCC) 8.1.0
kernel signature: ceda2376bb2ea1857920e3b2995495f8cd8565d21d41dcc1f526224dc8e641c0
run #0: crashed: WARNING in pm_qos_remove_request
run #1: OK
run #2: OK
run #3: OK
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
revisions tested: 2, total time: 33m37.110717343s (build: 18m17.899328611s, test: 14m9.344945321s)
the crash still happens on HEAD
commit msg: Linux 4.19.128
crash: WARNING in pm_qos_remove_request
NOHZ: local_softirq_pending 08
------------[ cut here ]------------
pm_qos_remove_request() called for unknown object
WARNING: CPU: 1 PID: 23093 at kernel/power/qos.c:535 pm_qos_remove_request+0x22a/0x350 kernel/power/qos.c:535
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 23093 Comm: syz-executor.4 Not tainted 4.19.128-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x123/0x177 lib/dump_stack.c:118
 panic+0x1cd/0x375 kernel/panic.c:186
 __warn.cold.8+0x1b/0x3e kernel/panic.c:541
 report_bug+0x1a4/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:178 [inline]
 do_error_trap+0x200/0x350 arch/x86/kernel/traps.c:296
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038
RIP: 0010:pm_qos_remove_request+0x22a/0x350 kernel/power/qos.c:535
Code: 04 24 48 85 c0 75 bb 65 ff 0d f2 c8 b5 7e 0f 85 47 fe ff ff e8 9a 33 b4 ff e9 3d fe ff ff 48 c7 c7 60 3d 2a 87 e8 89 8e ec ff <0f> 0b 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c3 65 ff 05 bd
RSP: 0018:ffff888091f7fb88 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff88809b470080 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff87677580 RDI: ffffffff8a186960
RBP: ffff888091f7fbb8 R08: ffffed1015d65079 R09: ffffed1015d65078
R10: ffffed1015d65078 R11: ffff8880aeb283c7 R12: 1ffff110123eff81
R13: ffff88809b4700a8 R14: ffff88808b28a500 R15: 0000000000004112
 snd_pcm_hw_free sound/core/pcm_native.c:822 [inline]
 snd_pcm_common_ioctl+0xa9a/0x1b30 sound/core/pcm_native.c:2896
 snd_pcm_ioctl+0x66/0xb0 sound/core/pcm_native.c:2975
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x196/0x10c0 fs/ioctl.c:688
 ksys_ioctl+0x62/0x90 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x6e/0xb0 fs/ioctl.c:710
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45c889
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f0562fdcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0562fdd6d4 RCX: 000000000045c889
RDX: 0000000000000000 RSI: 0000000000004112 RDI: 0000000000000005
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000004fa R14: 00000000004d3d58 R15: 000000000076bf0c
Kernel Offset: disabled
Rebooting in 86400 seconds..