------------[ cut here ]------------ WARNING: CPU: 0 PID: 12787 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: 0 PID: 12787 Comm: syz-executor.2 Not tainted 4.19.186-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:186 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 0f a5 88 e8 b8 fa f8 ff 0f 0b 49 c7 c4 ea ff ff ff e9 5f 3b f7 fa e8 40 12 69 f9 48 c7 c7 e0 0f a5 88 e8 99 fa f8 ff <0f> 0b e9 3c 43 f7 fa e8 28 12 69 f9 48 c7 c7 e0 0f a5 88 e8 81 fa RSP: 0018:ffff8880b320fb68 EFLAGS: 00010286 RAX: 0000000000000024 RBX: 0000000000000001 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff814dddb1 RDI: ffffed1016641f5f RBP: ffff8880aaebc2c0 R08: 0000000000000024 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff8880983eb000 R14: ffff88809ce94920 R15: ffff88809a4a7200 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: 0033:0x4678b7 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:00007fff38b9f6c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000000004678b7 RDX: 00007fff38b9f79a RSI: 0000000000000002 RDI: 00007fff38b9f790 RBP: 00007fff38b9f790 R08: 00000000ffffffff R09: 00007fff38b9f560 R10: 0000000002c528e3 R11: 0000000000000246 R12: 00000000004bebb2 R13: 00007fff38ba0860 R14: 0000000002c52810 R15: 00007fff38ba08a0 Kernel Offset: disabled Rebooting in 86400 seconds..