bisecting fixing commit since 2034d6f0838e465dd8f120c4e946d8444b4bb5df building syzkaller on 6a81331a1d4c744da9204d02ec88d558f7eea9c9 testing commit 2034d6f0838e465dd8f120c4e946d8444b4bb5df compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 15c85f6c255ceff0c70503329b5e01f2938cd99276e56f965ab4c08a00f06fec 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: crashed: WARNING: locking bug in __sb_end_write run #14: OK run #15: crashed: WARNING: locking bug in __sb_end_write run #16: OK run #17: OK run #18: OK run #19: OK testing current HEAD e23d55af0e1fca9be5c99f0c37d48b289f4d6489 testing commit e23d55af0e1fca9be5c99f0c37d48b289f4d6489 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: df0ad7afa8a9c287bff012d4e4232e41841bc98ac2a42bb7bc99c5ff4e263745 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: OK run #9: OK revisions tested: 2, total time: 41m40.530801371s (build: 22m57.750653542s, test: 18m17.02331238s) the crash still happens on HEAD commit msg: Linux 4.19.205 crash: WARNING: locking bug in __sb_end_write ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(depth <= 0) WARNING: CPU: 0 PID: 10208 at kernel/locking/lockdep.c:3670 __lock_release kernel/locking/lockdep.c:3670 [inline] WARNING: CPU: 0 PID: 10208 at kernel/locking/lockdep.c:3670 lock_release+0x669/0x840 kernel/locking/lockdep.c:3927 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 10208 Comm: syz-executor.2 Not tainted 4.19.205-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+0x17c/0x226 lib/dump_stack.c:118 panic+0x1cd/0x375 kernel/panic.c:186 __warn.cold.7+0x1b/0x36 kernel/panic.c:541 report_bug+0x1a1/0x200 lib/bug.c:183 fixup_bug arch/x86/kernel/traps.c:178 [inline] fixup_bug arch/x86/kernel/traps.c:173 [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:__lock_release kernel/locking/lockdep.c:3670 [inline] RIP: 0010:lock_release+0x669/0x840 kernel/locking/lockdep.c:3927 Code: 03 38 d0 7c 08 84 d2 0f 85 c7 01 00 00 8b 35 0e b9 79 0a 85 f6 75 15 48 c7 c6 40 99 09 88 48 c7 c7 00 66 09 88 e8 ec 2f 3b 06 <0f> 0b 48 8b 95 70 ff ff ff 4c 89 e6 4c 89 ff e8 f3 6f ff ff e9 49 RSP: 0018:ffff88807fbd7d38 EFLAGS: 00010086 RAX: 0000000000000000 RBX: 1ffff1100ff7afaa RCX: 0000000000000000 RDX: 0000000000000004 RSI: 0000000000000004 RDI: 0000000000000000 RBP: ffff88807fbd7dd8 R08: fffffbfff132e779 R09: fffffbfff132e778 R10: fffffbfff132e778 R11: ffffffff89973bc3 R12: ffff88809a1706d0 R13: 0000000000000000 R14: ffff88809b8a2d00 R15: ffff88809b8a2480 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:1353 file_end_write include/linux/fs.h:2793 [inline] vfs_write+0x2e4/0x4d0 fs/read_write.c:555 ksys_write+0x103/0x260 fs/read_write.c:599 __do_sys_write fs/read_write.c:611 [inline] __se_sys_write fs/read_write.c:608 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:608 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x466459 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f261fed0188 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: 00007fff0b33ba1f R14: 00007f261fed0300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..