BTRFS info (device loop2): last unmount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d BTRFS info (device loop2): at unmount dio bytes count 61440 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5249 at fs/btrfs/block-group.c:159 btrfs_put_block_group fs/btrfs/block-group.c:159 [inline] WARNING: CPU: 0 PID: 5249 at fs/btrfs/block-group.c:159 btrfs_put_block_group+0x3b6/0x450 fs/btrfs/block-group.c:146 Modules linked in: CPU: 0 PID: 5249 Comm: syz-executor.2 Not tainted 6.10.0-rc3-syzkaller-00044-g2ccbdf43d5e7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:btrfs_put_block_group fs/btrfs/block-group.c:159 [inline] RIP: 0010:btrfs_put_block_group+0x3b6/0x450 fs/btrfs/block-group.c:146 Code: 00 00 00 4c 89 ef e8 69 14 d0 00 e9 9a fe ff ff e8 4f 45 3c fe e9 f9 fc ff ff e8 45 45 3c fe e9 2d fd ff ff e8 6b 12 df fd 90 <0f> 0b 90 e9 77 fd ff ff e8 5d 12 df fd b9 5b 02 00 00 48 c7 c2 80 RSP: 0018:ffffc90002d37b48 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888028ab3000 RCX: ffffffff83af7adc RDX: ffff88801f82a440 RSI: ffffffff83af7d65 RDI: 0000000000000007 RBP: 000000000000f000 R08: 0000000000000007 R09: 0000000000000000 R10: 000000000000f000 R11: 0000000000000002 R12: ffff888000c00000 R13: 0000000000000001 R14: ffff888028ab3160 R15: ffff888028ab3000 FS: 0000000000000000(0000) GS:ffff88802c000000(0063) knlGS:0000000057434400 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000eeaa1000 CR3: 000000004b6ac000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: btrfs_free_block_groups+0x9f5/0x13e0 fs/btrfs/block-group.c:4418 close_ctree+0xa54/0xf90 fs/btrfs/disk-io.c:4381 generic_shutdown_super+0x159/0x3d0 fs/super.c:642 kill_anon_super+0x3a/0x60 fs/super.c:1226 btrfs_kill_super+0x3b/0x50 fs/btrfs/super.c:2096 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 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+0x80/0x120 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: 0023:0xf7339579 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:00000000ff8a9c68 EFLAGS: 00000292 ORIG_RAX: 0000000000000034 RAX: 0000000000000000 RBX: 00000000ff8a9d10 RCX: 0000000000000009 RDX: 00000000f748fff4 RSI: 00000000f73e0361 RDI: 00000000ff8aadb4 RBP: 00000000ff8a9d10 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