bcachefs (loop7): bucket 0:26 data type btree ptr gen 0 missing in alloc btree
  while marking u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq ac62141f8dc7e261 written 24 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0, fixing
------------[ cut here ]------------
btree trans held srcu lock (delaying memory reclaim) for 20 seconds
WARNING: CPU: 0 PID: 8337 at fs/bcachefs/btree_iter.c:3232 check_srcu_held_too_long fs/bcachefs/btree_iter.c:3230 [inline]
WARNING: CPU: 0 PID: 8337 at fs/bcachefs/btree_iter.c:3232 bch2_trans_srcu_unlock+0x50d/0x620 fs/bcachefs/btree_iter.c:3246
Modules linked in:
CPU: 0 UID: 0 PID: 8337 Comm: syz.7.252 Not tainted 6.15.0-syzkaller-10769-g7d4e49a77d99 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:check_srcu_held_too_long fs/bcachefs/btree_iter.c:3230 [inline]
RIP: 0010:bch2_trans_srcu_unlock+0x50d/0x620 fs/bcachefs/btree_iter.c:3246
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 00 3f d3 8b 48 89 d6 e8 54 06 62 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:ffffc9000ecde9b8 EFLAGS: 00010246
RAX: 2003fb31a0568a00 RBX: 1ffff1100b205008 RCX: 0000000000080000
RDX: ffffc9001595b000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: 1ffff1100b205011 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa644 R12: ffff888059028042
R13: ffff888059028088 R14: 1ffff1100b205008 R15: 000000000000020a
FS:  00007fc70c0b66c0(0000) GS:ffff888125c95000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000007eaac000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_trans_begin+0x1a00/0x1fb0 fs/bcachefs/btree_iter.c:3322
 bch2_gc_btree fs/bcachefs/btree_gc.c:691 [inline]
 bch2_gc_btrees fs/bcachefs/btree_gc.c:754 [inline]
 bch2_check_allocations+0x117c/0x55f0 fs/bcachefs/btree_gc.c:1056
 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:415 [inline]
 __bch2_run_recovery_passes+0x382/0x10b0 fs/bcachefs/recovery_passes.c:470
 bch2_run_recovery_passes+0x184/0x210 fs/bcachefs/recovery_passes.c:541
 bch2_fs_recovery+0x2617/0x3970 fs/bcachefs/recovery.c:974
 bch2_fs_start+0xa43/0xd30 fs/bcachefs/super.c:1206
 bch2_fs_get_tree+0xbfc/0x15f0 fs/bcachefs/fs.c:2479
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1802
 do_new_mount+0x24a/0xa40 fs/namespace.c:3856
 do_mount fs/namespace.c:4193 [inline]
 __do_sys_mount fs/namespace.c:4404 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4381
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc70b19010a
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:00007fc70c0b5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fc70c0b5ef0 RCX: 00007fc70b19010a
RDX: 00002000000000c0 RSI: 0000200000000180 RDI: 00007fc70c0b5eb0
RBP: 00002000000000c0 R08: 00007fc70c0b5ef0 R09: 0000000000800000
R10: 0000000000800000 R11: 0000000000000246 R12: 0000200000000180
R13: 00007fc70c0b5eb0 R14: 0000000000005934 R15: 0000200000000480
 </TASK>