bisecting fixing commit since 45f092f9e9cb31486db546e39bfe7cc0b3f57099
building syzkaller on cfc9868f25f37077a00800c89ed55586a333cdf3
testing commit 45f092f9e9cb31486db546e39bfe7cc0b3f57099 with gcc (GCC) 8.1.0
kernel signature: 7ed52113af3976a23e38584ca9863610aeb9a0bb
run #0: crashed: general protection fault in prepare_to_wait
run #1: crashed: general protection fault in prepare_to_wait
run #2: crashed: general protection fault in prepare_to_wait
run #3: crashed: general protection fault in prepare_to_wait
run #4: OK
run #5: OK
run #6: OK
run #7: OK
run #8: OK
run #9: OK
testing current HEAD c04fc6fa5c96ec57316527b2228fa31f26494abe
testing commit c04fc6fa5c96ec57316527b2228fa31f26494abe with gcc (GCC) 8.1.0
kernel signature: a2f58a67562cca9358608ae732db4599c3d76ed8
run #0: crashed: general protection fault in prepare_to_wait
run #1: crashed: general protection fault in prepare_to_wait
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: 37m29.676722627s (build: 16m55.853845715s, test: 20m1.160582273s)
the crash still happens on HEAD
commit msg: Linux 4.14.165
crash: general protection fault in prepare_to_wait
IPv6: ADDRCONF(NETDEV_CHANGE): hsr_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready
8021q: adding VLAN 0 to HW filter on device batadv0
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 6919 Comm: syz-executor.5 Not tainted 4.14.165-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88807e8e2440 task.stack: ffff888081610000
RIP: 0010:__lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365
RSP: 0018:ffff8880816178f0 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff879169c0
RBP: ffff888081617ac0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: ffff88807e8e2440 R12: 0000000000000018
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
FS:  00007fb047419700(0000) GS:ffff8880aee00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000009e606000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x173/0x400 kernel/locking/lockdep.c:3994
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:160
 prepare_to_wait+0x8a/0x3b0 kernel/sched/wait.c:234
 nr_accept+0x1a8/0x670 net/netrom/af_netrom.c:796
 SYSC_accept4+0x306/0x5e0 net/socket.c:1587
 SyS_accept4+0x9/0x10 net/socket.c:1537
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x459829
RSP: 002b:00007fb047418c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000120
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000459829
RDX: 0000000020000240 RSI: 00000000200002c0 RDI: 0000000000000006
RBP: 000000000075c118 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000800 R11: 0000000000000246 R12: 00007fb0474196d4
R13: 00000000004bf7c8 R14: 00000000004d1230 R15: 00000000ffffffff
Code: 00 00 00 00 8b 84 24 98 00 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 e2 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 30 00 00 49 81 3c 24 a0 f2 7a 88 0f 84 30 
RIP: __lock_acquire+0x1d5/0x4500 kernel/locking/lockdep.c:3365 RSP: ffff8880816178f0
---[ end trace 4ece9ec314aa3943 ]---