UBIFS error (pid: 21523): cannot open "/dev/loop1", error -22 ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(mutex_is_locked(lock)) WARNING: CPU: 0 PID: 21678 at kernel/locking/mutex-debug.c:103 mutex_destroy+0xec/0x130 kernel/locking/mutex-debug.c:103 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 21678 Comm: syz-executor.1 Not tainted 4.19.196-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+0x1fc/0x2ef lib/dump_stack.c:118 panic+0x26a/0x50e kernel/panic.c:186 __warn.cold+0x20/0x5a kernel/panic.c:541 report_bug+0x262/0x2b0 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+0x1d7/0x310 arch/x86/kernel/traps.c:296 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:1038 RIP: 0010:mutex_destroy+0xec/0x130 kernel/locking/mutex-debug.c:103 Code: 11 38 d0 7c 04 84 d2 75 50 8b 05 9f 65 ec 0b 85 c0 0f 85 63 ff ff ff 48 c7 c6 c0 0f 6a 88 48 c7 c7 00 10 6a 88 e8 24 81 a7 06 <0f> 0b e9 49 ff ff ff 48 c7 c7 60 07 24 8d e8 61 e7 4d 00 e9 2e ff RSP: 0018:ffff88804a76fde0 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff88809d611c80 RCX: 0000000000000000 RDX: 0000000000016fd8 RSI: ffffffff814dfc91 RDI: ffffed10094edfae RBP: ffff88809d611b00 R08: 0000000000000000 R09: 0000000000003ec9 R10: 0000000000000006 R11: ffffffff8c66201b R12: 0000000000000000 R13: ffff88809d611c80 R14: ffff8880a1f04e88 R15: ffff88823b297820 ww_mutex_destroy include/linux/ww_mutex.h:358 [inline] reservation_object_fini include/linux/reservation.h:129 [inline] dma_buf_release+0x531/0x630 drivers/dma-buf/dma-buf.c:77 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 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:00007fa716b0e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 000000000056c0f0 RCX: 00000000004665d9 RDX: 0000000020000040 RSI: 00000000c00464b4 RDI: 0000000000000006 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c0f0 R13: 00007fff936b264f R14: 00007fa716b0e300 R15: 0000000000022000 Kernel Offset: disabled Rebooting in 86400 seconds..