------------[ cut here ]------------ WARNING: CPU: 1 PID: 8118 at fs/btrfs/volumes.c:1086 close_fs_devices.part.0.cold+0x11/0x30 fs/btrfs/volumes.c:1086 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8118 Comm: syz-executor.5 Not tainted 4.19.199-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:close_fs_devices.part.0.cold+0x11/0x30 fs/btrfs/volumes.c:1086 Code: c7 c7 e0 14 a5 88 e8 eb fb f8 ff 0f 0b 49 c7 c4 ea ff ff ff e9 c1 6c f6 fa e8 12 1b 68 f9 48 c7 c7 e0 14 a5 88 e8 cc fb f8 ff <0f> 0b e9 9e 74 f6 fa e8 fa 1a 68 f9 48 c7 c7 e0 14 a5 88 e8 b4 fb RSP: 0018:ffff88804cb6fb68 EFLAGS: 00010286 RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814dfcf1 RDI: ffffed100996df5f RBP: ffff888092eb7280 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880ab2c9040 R14: ffff888096eea960 R15: ffff8880a2475240 close_fs_devices fs/btrfs/volumes.c:1113 [inline] btrfs_close_devices+0x95/0x1f0 fs/btrfs/volumes.c:1099 close_ctree+0x3c8/0x850 fs/btrfs/disk-io.c:4047 generic_shutdown_super+0x144/0x370 fs/super.c:456 kill_anon_super+0x36/0x60 fs/super.c:1032 btrfs_kill_super+0x49/0x550 fs/btrfs/super.c:2221 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 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: 0033:0x467a47 Code: ff d0 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 a6 00 00 00 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:00007ffc4319b688 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000467a47 RDX: 00007ffc4319b75c RSI: 0000000000000002 RDI: 00007ffc4319b750 RBP: 00007ffc4319b750 R08: 00000000ffffffff R09: 00007ffc4319b520 R10: 0000000001f568e3 R11: 0000000000000246 R12: 00000000004bee90 R13: 00007ffc4319c820 R14: 0000000001f56810 R15: 00007ffc4319c860 Kernel Offset: disabled Rebooting in 86400 seconds..