bisecting fixing commit since bd634aa6416382439890b78f7be0023020a86207
building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9
testing commit bd634aa6416382439890b78f7be0023020a86207 with gcc (GCC) 8.4.1 20210217
kernel signature: 0d2b7235b5f651b3f786f4083cf8ef9488b4f5ded68b7990dd629f0f71fd19a9
run #0: crashed: WARNING: locking bug in __sb_end_write
run #1: crashed: WARNING: locking bug in __sb_end_write
run #2: crashed: WARNING: locking bug in __sb_end_write
run #3: crashed: WARNING: locking bug in __sb_end_write
run #4: crashed: WARNING: locking bug in __sb_end_write
run #5: crashed: WARNING: locking bug in __sb_end_write
run #6: crashed: WARNING: locking bug in __sb_end_write
run #7: crashed: WARNING: locking bug in __sb_end_write
run #8: crashed: WARNING: locking bug in __sb_end_write
run #9: crashed: WARNING: locking bug in __sb_end_write
run #10: crashed: WARNING: locking bug in __sb_end_write
run #11: crashed: WARNING: locking bug in __sb_end_write
run #12: crashed: WARNING: locking bug in __sb_end_write
run #13: OK
run #14: OK
run #15: OK
run #16: OK
run #17: OK
run #18: OK
run #19: OK
testing current HEAD 7d7d1c0ab3eb7c8d8f63a126535018007823b207
testing commit 7d7d1c0ab3eb7c8d8f63a126535018007823b207 with gcc (GCC) 8.4.1 20210217
kernel signature: cc678c764d9a5122e1032ab724155f960c8ba218774f9594ddfa70d6471bce12
run #0: crashed: WARNING: locking bug in __sb_end_write
run #1: crashed: WARNING: locking bug in __sb_end_write
run #2: crashed: WARNING: locking bug in __sb_end_write
run #3: crashed: WARNING: locking bug in __sb_end_write
run #4: crashed: WARNING: locking bug in __sb_end_write
run #5: crashed: WARNING: locking bug in __sb_end_write
run #6: crashed: WARNING: locking bug in __sb_end_write
run #7: crashed: WARNING: locking bug in __sb_end_write
run #8: crashed: WARNING: locking bug in __sb_end_write
run #9: OK
revisions tested: 2, total time: 33m32.588207926s (build: 15m21.718285661s, test: 17m40.519999362s)
the crash still happens on HEAD
commit msg: Linux 4.14.232
crash: WARNING: locking bug in __sb_end_write
DEBUG_LOCKS_WARN_ON(depth <= 0)
------------[ cut here ]------------
WARNING: CPU: 0 PID: 12643 at kernel/locking/lockdep.c:3760 __lock_release kernel/locking/lockdep.c:3760 [inline]
WARNING: CPU: 0 PID: 12643 at kernel/locking/lockdep.c:3760 lock_release.cold.53+0x13/0x9d kernel/locking/lockdep.c:4017
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 12643 Comm: syz-executor.5 Not tainted 4.14.232-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x14b/0x1e7 lib/dump_stack.c:58
 panic+0x1b0/0x358 kernel/panic.c:183
 __warn.cold.7+0x25/0x25 kernel/panic.c:547
 report_bug+0x1a1/0x200 lib/bug.c:186
 fixup_bug arch/x86/kernel/traps.c:177 [inline]
 fixup_bug arch/x86/kernel/traps.c:172 [inline]
 do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295
 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:964
RIP: 0010:__lock_release kernel/locking/lockdep.c:3760 [inline]
RIP: 0010:lock_release.cold.53+0x13/0x9d kernel/locking/lockdep.c:4017
RSP: 0018:ffff88809ac57d38 EFLAGS: 00010082
RAX: 000000000000001f RBX: 1ffff1101358afaa RCX: 0000000000000000
RDX: 000000000000001f RSI: 0000000000000001 RDI: ffffed101358af9e
RBP: ffff88809ac57dd8 R08: 0000000000000001 R09: 0000000000000001
R10: fffffbfff15ec827 R11: dffffc0000000000 R12: ffff88809bc506d0
R13: 0000000000000000 R14: ffff888087162540 R15: ffff888087162dc0
 percpu_up_read_preempt_enable include/linux/percpu-rwsem.h:102 [inline]
 percpu_up_read include/linux/percpu-rwsem.h:108 [inline]
 __sb_end_write+0xa4/0xd0 fs/super.c:1329
 file_end_write include/linux/fs.h:2726 [inline]
 vfs_write+0x30b/0x4f0 fs/read_write.c:550
 SYSC_write fs/read_write.c:590 [inline]
 SyS_write+0x100/0x250 fs/read_write.c:582
 do_syscall_64+0x1c7/0x5b0 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x46/0xbb
RIP: 0033:0x466459
RSP: 002b:00007f1cc09e6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056c0b0 RCX: 0000000000466459
RDX: 0000000020104000 RSI: 0000000020004200 RDI: 0000000000000004
RBP: 00000000004bf9fb R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0b0
R13: 00007ffd1b159daf R14: 00007f1cc09e6300 R15: 0000000000022000
Kernel Offset: disabled
Rebooting in 86400 seconds..