bcachefs (loop7): bucket incorrectly unset in freespace btree
  u64s 5 type deleted 0:2:0 len 0 ver 0, , continuing
------------[ cut here ]------------
btree trans held srcu lock (delaying memory reclaim) for 11 seconds
WARNING: CPU: 1 PID: 6561 at fs/bcachefs/btree_iter.c:3179 check_srcu_held_too_long fs/bcachefs/btree_iter.c:3177 [inline]
WARNING: CPU: 1 PID: 6561 at fs/bcachefs/btree_iter.c:3179 bch2_trans_srcu_unlock+0x50d/0x620 fs/bcachefs/btree_iter.c:3193
Modules linked in:
CPU: 1 UID: 0 PID: 6561 Comm: syz.7.107 Not tainted 6.15.0-rc5-syzkaller-00136-g9c69f8884904 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
RIP: 0010:check_srcu_held_too_long fs/bcachefs/btree_iter.c:3177 [inline]
RIP: 0010:bch2_trans_srcu_unlock+0x50d/0x620 fs/bcachefs/btree_iter.c:3193
Code: 7d 00 49 c1 ef 02 48 b9 c3 f5 28 5c 8f c2 f5 28 4c 89 f8 48 f7 e1 48 c1 ea 02 48 c7 c7 60 ca b2 8b 48 89 d6 e8 f4 8e 68 fd 90 <0f> 0b 90 90 e9 a6 fe ff ff 44 89 e1 80 e1 07 38 c1 0f 8c 1c fb ff
RSP: 0018:ffffc90001566ad8 EFLAGS: 00010246
RAX: edf74be01008e100 RBX: 1ffff1100c025808 RCX: 0000000000080000
RDX: ffffc900048e2000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 1ffff1100c025811 R08: ffff8880b8823e93 R09: 1ffff110171047d2
R10: dffffc0000000000 R11: ffffed10171047d3 R12: ffff88806012c042
R13: ffff88806012c088 R14: 1ffff1100c025808 R15: 0000000000000116
FS:  00007f4b68c766c0(0000) GS:ffff888126200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fa780e74000 CR3: 000000006c750000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_trans_begin+0x19b0/0x1f10 fs/bcachefs/btree_iter.c:3270
 bch2_trans_mark_metadata_bucket+0x1a2/0x1200 fs/bcachefs/buckets.c:1052
 bch2_trans_mark_metadata_sectors fs/bcachefs/buckets.c:1069 [inline]
 __bch2_trans_mark_dev_sb fs/bcachefs/buckets.c:1109 [inline]
 bch2_trans_mark_dev_sb+0x3ed/0x7c0 fs/bcachefs/buckets.c:1137
 bch2_trans_mark_dev_sbs_flags+0x6a1/0x700 fs/bcachefs/buckets.c:1147
 bch2_run_recovery_pass+0xdf/0x1d0 fs/bcachefs/recovery_passes.c:227
 bch2_run_recovery_passes+0x2a0/0xdb0 fs/bcachefs/recovery_passes.c:280
 bch2_fs_recovery+0x2399/0x37b0 fs/bcachefs/recovery.c:937
 bch2_fs_start+0x70b/0xae0 fs/bcachefs/super.c:1096
 bch2_fs_get_tree+0xad7/0x13b0 fs/bcachefs/fs.c:2505
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1759
 do_new_mount+0x24a/0xa40 fs/namespace.c:3884
 do_mount fs/namespace.c:4224 [inline]
 __do_sys_mount fs/namespace.c:4435 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4412
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b67d9010a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4b68c75e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f4b68c75ef0 RCX: 00007f4b67d9010a
RDX: 00002000000003c0 RSI: 0000200000000000 RDI: 00007f4b68c75eb0
RBP: 00002000000003c0 R08: 00007f4b68c75ef0 R09: 0000000000808040
R10: 0000000000808040 R11: 0000000000000246 R12: 0000200000000000
R13: 00007f4b68c75eb0 R14: 0000000000005903 R15: 0000200000000400
 </TASK>