------------[ cut here ]------------
WARNING: CPU: 0 PID: 6315 at kernel/rcu/srcutree.c:1327 srcu_gp_start_if_needed+0xf8a/0x11d0 kernel/rcu/srcutree.c:1327
Modules linked in:
CPU: 0 UID: 0 PID: 6315 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:srcu_gp_start_if_needed+0xf8a/0x11d0 kernel/rcu/srcutree.c:1327
Code: c7 c0 00 b0 99 e8 f6 17 7d 00 48 8b 35 ff fe 09 18 48 8b 54 24 10 48 81 c2 60 01 00 00 89 df e8 0c ff e3 ff e9 dc fd ff ff 90 <0f> 0b 90 e9 6c f7 ff ff e8 39 c6 d3 09 41 f7 c7 00 02 00 00 0f 85
RSP: 0018:ffffc900036979a0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffffe8ffffc7dbc0 RCX: cade8f0630afad00
RDX: 0000000000000001 RSI: fffffffffffffe74 RDI: ffffe8ffffc7dc00
RBP: ffffc90003697af0 R08: 0000000000000000 R09: ffffffff81a5f58d
R10: dffffc0000000000 R11: fffff520006d2f20 R12: dffffc0000000000
R13: ffff88802e0f2180 R14: ffffe8ffffc7dc00 R15: 0000000000000246
FS:  0000555571117500(0000) GS:ffff888125c18000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd83bd53000 CR3: 00000000543e6000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __call_srcu kernel/rcu/srcutree.c:1391 [inline]
 __synchronize_srcu+0x306/0x3a0 kernel/rcu/srcutree.c:1443
 bch2_fs_btree_iter_exit+0x3f9/0x490 fs/bcachefs/btree_iter.c:3750
 __bch2_fs_free fs/bcachefs/super.c:617 [inline]
 bch2_fs_release+0x2ab/0x830 fs/bcachefs/super.c:667
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x22b/0x480 lib/kobject.c:737
 deactivate_locked_super+0xbc/0x130 fs/super.c:474
 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1375
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3c9b58e117
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd131c2a68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f3c9b60e08c RCX: 00007f3c9b58e117
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffd131c2b20
RBP: 00007ffd131c2b20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd131c3bb0
R13: 00007f3c9b60e08c R14: 000000000004a367 R15: 00007ffd131c3bf0
 </TASK>