syzbot

kernel BUG at fs/bcachefs/btree_cache.c:594!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 5214 Comm: syz-executor803 Not tainted 6.12.0-rc3-syzkaller-00319-gb04ae0f45168 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:bch2_fs_btree_cache_exit+0x1124/0x1130 fs/bcachefs/btree_cache.c:593
Code: fd 90 0f 0b e8 7d 5e 84 fd 90 0f 0b e8 75 5e 84 fd 90 0f 0b e8 6d 5e 84 fd 90 0f 0b e8 65 5e 84 fd 90 0f 0b e8 5d 5e 84 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002e3fc40 EFLAGS: 00010293
RAX: ffffffff84108953 RBX: 0000000000000002 RCX: ffff88801c7f8000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff1100e7d4a16 R08: ffffffff84107ff7 R09: 1ffff1100c0403b6
R10: dffffc0000000000 R11: ffffed100c0403b7 R12: ffff888060201c78
R13: ffff888060200000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055558fc283c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3158dff000 CR3: 000000002da94000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __bch2_fs_free fs/bcachefs/super.c:556 [inline]
 bch2_fs_release+0x20e/0x7d0 fs/bcachefs/super.c:610
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22f/0x480 lib/kobject.c:737
 deactivate_locked_super+0xc4/0x130 fs/super.c:473
 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373
 task_work_run+0x24f/0x310 kernel/task_work.c:228
 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+0x168/0x370 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3160283e67
Code: 08 00 48 83 c4 08 5b 5d c3 66 2e 0f 1f 84 00 00 00 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fff0981e808 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f3160283e67
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fff0981e8c0
RBP: 00007fff0981e8c0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000202 R12: 00007fff0981f980
R13: 000055558fc29700 R14: 00007fff0981f924 R15: 00007fff0981f9a0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_fs_btree_cache_exit+0x1124/0x1130 fs/bcachefs/btree_cache.c:593
Code: fd 90 0f 0b e8 7d 5e 84 fd 90 0f 0b e8 75 5e 84 fd 90 0f 0b e8 6d 5e 84 fd 90 0f 0b e8 65 5e 84 fd 90 0f 0b e8 5d 5e 84 fd 90 <0f> 0b 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc90002e3fc40 EFLAGS: 00010293
RAX: ffffffff84108953 RBX: 0000000000000002 RCX: ffff88801c7f8000
RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000
RBP: 1ffff1100e7d4a16 R08: ffffffff84107ff7 R09: 1ffff1100c0403b6
R10: dffffc0000000000 R11: ffffed100c0403b7 R12: ffff888060201c78
R13: ffff888060200000 R14: 0000000000000000 R15: dffffc0000000000
FS:  000055558fc283c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3158dff000 CR3: 000000002da94000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400