bisecting fixing commit since d183c8e2647a7d45202c14a33631f6c09020f8ac
building syzkaller on dd56146d2611f7de0fbb7d8db6c016d3dcdc6371
testing commit d183c8e2647a7d45202c14a33631f6c09020f8ac with gcc (GCC) 8.1.0
kernel signature: 0023cdcbce3fe96a604baaaa6d045d4c06277752b78f75bcf92c3116e771f50d
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: crashed: general protection fault in prepare_to_wait
run #5: crashed: general protection fault in prepare_to_wait
run #6: crashed: general protection fault in prepare_to_wait
run #7: crashed: general protection fault in prepare_to_wait
run #8: OK
run #9: OK
testing current HEAD 258f0cf7ac3b788a14c0d01aab3c4aea02f8c86e
testing commit 258f0cf7ac3b788a14c0d01aab3c4aea02f8c86e with gcc (GCC) 8.1.0
kernel signature: 30089efb48a7e2ebcdf71aad8d4bce92bbf9e76fff75bb279b817f762ef43037
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: crashed: general protection fault in prepare_to_wait
run #5: crashed: general protection fault in prepare_to_wait
run #6: crashed: general protection fault in prepare_to_wait
run #7: crashed: general protection fault in prepare_to_wait
run #8: crashed: general protection fault in prepare_to_wait
run #9: OK
revisions tested: 2, total time: 41m26.00743063s (build: 20m3.722094659s, test: 19m30.119550343s)
the crash still happens on HEAD
commit msg: Linux 4.19.123
crash: general protection fault in prepare_to_wait
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): batadv_slave_1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready
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
CPU: 1 PID: 7774 Comm: syz-executor.2 Not tainted 4.19.123-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x1e0/0x4980 kernel/locking/lockdep.c:3294
Code: 28 00 00 00 0f 85 2a 30 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 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 28 32 00 00 49 81 7d 00 60 d5 5c 89 0f 84 4a ff
RSP: 0018:ffff88808f747900 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff88520740
RBP: ffff88808f747af0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000018 R14: ffff88809f560380 R15: 0000000000000000
FS:  00007efd643a3700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc3d86f470 CR3: 000000008ee86000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:3907
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152
 prepare_to_wait+0x90/0x310 kernel/sched/wait.c:230
 nr_accept+0x1b0/0x690 net/netrom/af_netrom.c:796
 __sys_accept4+0x32b/0x6b0 net/socket.c:1589
 __do_sys_accept net/socket.c:1630 [inline]
 __se_sys_accept net/socket.c:1627 [inline]
 __x64_sys_accept+0x70/0xb0 net/socket.c:1627
 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45b349
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:00007efd643a2c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: ffffffffffffffda RBX: 00007efd643a36d4 RCX: 000000000045b349
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000000 R14: 00000000004c1558 R15: 000000000075bfd4
Modules linked in:
---[ end trace 312f01d526e75547 ]---
RIP: 0010:__lock_acquire+0x1e0/0x4980 kernel/locking/lockdep.c:3294
Code: 28 00 00 00 0f 85 2a 30 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 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 28 32 00 00 49 81 7d 00 60 d5 5c 89 0f 84 4a ff
RSP: 0018:ffff88808f747900 EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000003 RSI: 0000000000000000 RDI: ffffffff88520740
RBP: ffff88808f747af0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000018 R14: ffff88809f560380 R15: 0000000000000000
FS:  00007efd643a3700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc3d86f470 CR3: 000000008ee86000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400