bisecting fixing commit since bfb9e5c03076a446b1f4f6a523ddc8d723c907a6
building syzkaller on 64ca0a371100fc7dfdb20de9263763e46c88a436
testing commit bfb9e5c03076a446b1f4f6a523ddc8d723c907a6 with gcc (GCC) 8.1.0
kernel signature: 3a2f331dc90533173cdf33e5573a9f49da6d02eeeecc4a9930e1ec1b9f13652d
all runs: crashed: kernel BUG at fs/buffer.c:LINE!
testing current HEAD 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796
testing commit 98db2bf27b9ed2d5ed0b6c9c8a4bfcb127a19796 with gcc (GCC) 8.1.0
kernel signature: 08380a396785c2a155145f67b6d4866b5480e09ef76c64abe1184d057d763650
all runs: crashed: kernel BUG at fs/buffer.c:LINE!
revisions tested: 2, total time: 24m54.084670928s (build: 17m18.955227094s, test: 6m36.863357127s)
the crash still happens on HEAD
commit msg: Linux 4.14.171
crash: kernel BUG at fs/buffer.c:LINE!
IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready
8021q: adding VLAN 0 to HW filter on device batadv0
------------[ cut here ]------------
kernel BUG at fs/buffer.c:3111!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 1 PID: 7154 Comm: syz-executor.0 Not tainted 4.14.171-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88808964c580 task.stack: ffff888070240000
RIP: 0010:submit_bh_wbc+0x50f/0x730 fs/buffer.c:3111
RSP: 0018:ffff888070247cc8 EFLAGS: 00010246
RAX: 0000000000000005 RBX: ffff88806efee0a8 RCX: 0000000000000000
RDX: 1ffff1100ddfdc15 RSI: 0000000000000800 RDI: 0000000000000001
RBP: ffff888070247d10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000028 R11: ffff88808964c580 R12: 0000000000000800
R13: ffff88806efee0a8 R14: 0000000000000000 R15: 0000000000000000
FS:  00000000017ac940(0000) GS:ffff8880aed00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001873008 CR3: 000000007ad52000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 submit_bh fs/buffer.c:3158 [inline]
 __sync_dirty_buffer+0xaf/0x210 fs/buffer.c:3244
 sync_dirty_buffer+0xe/0x10 fs/buffer.c:3257
 fat_set_state+0x1be/0x280 fs/fat/inode.c:695
 fat_put_super+0x40/0xd0 fs/fat/inode.c:721
 generic_shutdown_super+0x12d/0x330 fs/super.c:446
 kill_block_super+0x96/0xe0 fs/super.c:1161
 deactivate_locked_super+0x62/0xb0 fs/super.c:319
 deactivate_super+0x7d/0x90 fs/super.c:350
 cleanup_mnt+0x9f/0x130 fs/namespace.c:1183
 __cleanup_mnt+0xd/0x10 fs/namespace.c:1190
 task_work_run+0xe5/0x170 kernel/task_work.c:113
 tracehook_notify_resume include/linux/tracehook.h:191 [inline]
 exit_to_usermode_loop+0x16a/0x1b0 arch/x86/entry/common.c:164
 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
 do_syscall_64+0x416/0x5b0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45d347
RSP: 002b:00007fff66ce2b38 EFLAGS: 00000206 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000045d347
RDX: 0000000000403720 RSI: 0000000000000002 RDI: 00007fff66ce2be0
RBP: 000000000000008c R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000005 R11: 0000000000000206 R12: 00007fff66ce3c70
R13: 00000000017ad940 R14: 0000000000000000 R15: 00007fff66ce3c70
Code: 75 33 45 89 65 10 4c 89 ef e8 ee b5 5a 01 31 c0 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 f0 80 63 01 f7 e9 96 fb ff ff 0f 0b <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b e8 b2 78 ec ff eb c6 e8 0b 78 ec 
RIP: submit_bh_wbc+0x50f/0x730 fs/buffer.c:3111 RSP: ffff888070247cc8
---[ end trace bc88641c448ba1fc ]---