BTRFS error (device loop3): failed to run delayed ref for logical 5242880 num_bytes 4096 type 178 action 1 ref_mod 1: -2 ------------[ cut here ]------------ BTRFS: Transaction aborted (error -2) WARNING: CPU: 0 PID: 15648 at fs/btrfs/extent-tree.c:2246 btrfs_run_delayed_refs+0x2d3/0x330 fs/btrfs/extent-tree.c:2246 Modules linked in: CPU: 0 PID: 15648 Comm: syz-executor.3 Not tainted 6.9.0-rc7-syzkaller-00183-gcf87f46fd34d #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:btrfs_run_delayed_refs+0x2d3/0x330 fs/btrfs/extent-tree.c:2246 Code: 93 9f 50 07 31 db e9 78 ff ff ff e8 e7 06 65 fe e9 b0 fd ff ff e8 fd 5b 08 fe 90 48 c7 c7 00 e2 55 8b 89 de e8 0e 22 cb fd 90 <0f> 0b 90 90 eb bc 48 8b 3c 24 e8 1e 07 65 fe e9 7a fe ff ff 4c 89 RSP: 0018:ffffc900236e7b50 EFLAGS: 00010286 RAX: 0000000000000000 RBX: 00000000fffffffe RCX: ffffffff815137b9 RDX: ffff88801e65c880 RSI: ffffffff815137c6 RDI: 0000000000000001 RBP: ffff888072813030 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000004 R12: 0000000000000001 R13: 0000000000000000 R14: ffffed10055ebc62 R15: ffff888072813090 FS: 0000000000000000(0000) GS:ffff88802c200000(0063) knlGS:0000000056ee6400 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f74720c4 CR3: 0000000073680000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_commit_transaction+0x783/0x3b40 fs/btrfs/transaction.c:2185 btrfs_sync_fs+0x13b/0x7c0 fs/btrfs/super.c:1006 sync_filesystem+0x1cc/0x290 fs/sync.c:66 generic_shutdown_super+0x7e/0x3d0 fs/super.c:620 kill_anon_super+0x3a/0x60 fs/super.c:1225 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2091 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x278/0x2a0 kernel/entry/common.c:218 __do_fast_syscall_32+0x82/0x120 arch/x86/entry/common.c:389 do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf72c8579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000ffd49408 EFLAGS: 00000292 ORIG_RAX: 0000000000000034 RAX: 0000000000000000 RBX: 00000000ffd494b0 RCX: 0000000000000009 RDX: 00000000f741fff4 RSI: 00000000f736f33a RDI: 00000000ffd4a554 RBP: 00000000ffd494b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi