gen 0 oldest_gen 0 data_type need_discard journal_seq 4 need_discard 1 need_inc_gen 1 dirty_sectors 0 stripe_sectors 0 cached_sectors 0 stripe 0 stripe_redundancy 0 io_time[READ] 1 io_time[WRITE] 512 fragmentation 0 bp_start 8 , fixing done bcachefs (loop0): check_btree_backpointers... done bcachefs (loop0): check_backpointers_to_extents... backpointer for missing btree node u64s 9 type backpointer 0:7077888:0 len 0 ver 0: bucket=0:27:0 btree=extents l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing backpointer for missing extent u64s 9 type backpointer 0:8912896:0 len 0 ver 0: bucket=0:34:0 btree=extents l=0 offset=0:0 len=8 pos=536870913:8:U32_MAX, fixing backpointer for missing extent u64s 9 type backpointer 0:9437184:0 len 0 ver 0: bucket=0:36:0 btree=extents l=0 offset=0:0 len=8 pos=4098:24:U32_MAX, fixing done bcachefs (loop0): check_extents_to_backpointers... missing backpointer for btree=inodes l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 19bc58a6c09b6540 written 24 min_key POS_MIN durability: 1 ptr: 0:38:0 gen 0 got: u64s 5 type deleted 0:9961472:0 len 0 ver 0 want: u64s 9 type backpointer 0:9961472:0 len 0 ver 0: bucket=0:38:0 btree=inodes l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing missing backpointer for btree=dirents l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq c18f4a4face03c6 written 24 min_key POS_MIN durability: 1 ptr: 0:41:0 gen 0 got: u64s 5 type deleted 0:10747904:0 len 0 ver 0 want: u64s 9 type backpointer 0:10747904:0 len 0 ver 0: bucket=0:41:0 btree=dirents l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing missing backpointer for btree=alloc l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 75277f57b0c8c24 written 40 min_key POS_MIN durability: 1 ptr: 0:26:0 gen 0 got: u64s 5 type deleted 0:6815744:0 len 0 ver 0 want: u64s 9 type backpointer 0:6815744:0 len 0 ver 0: bucket=0:26:0 btree=alloc l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing missing backpointer for btree=subvolumes l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 7675f41d391e5d36 written 16 min_key POS_MIN durability: 1 ptr: 0:35:0 gen 0 got: u64s 5 type deleted 0:9175040:0 len 0 ver 0 want: u64s 9 type backpointer 0:9175040:0 len 0 ver 0: bucket=0:35:0 btree=subvolumes l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing missing backpointer for btree=snapshots l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq bcb9905dfb2993d5 written 16 min_key POS_MIN durability: 1 ptr: 0:32:0 gen 0 got: u64s 5 type deleted 0:8388608:0 len 0 ver 0 want: u64s 9 type backpointer 0:8388608:0 len 0 ver 0: bucket=0:32:0 btree=snapshots l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing missing backpointer for btree=freespace l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq 9a831b4a3f983356 written 48 min_key POS_MIN durability: 1 ptr: 0:29:0 gen 0 got: u64s 5 type deleted 0:7602176:0 len 0 ver 0 want: u64s 9 type backpointer 0:7602176:0 len 0 ver 0: bucket=0:29:0 btree=freespace l=1 offset=0:0 len=256 pos=SPOS_MAX, fixing done bcachefs (loop0): check_alloc_to_lru_refs... done bcachefs (loop0): check_snapshot_trees... done bcachefs (loop0): check_snapshots... snapshot points to missing/incorrect tree: u64s 8 type snapshot 0:4294967295:0 len 0 ver 0: is_subvol 1 deleted 0 parent 0 children 0 0 subvol 1 tree 0, fixing ============================= WARNING: suspicious RCU usage 6.11.0-syzkaller-09015-g18ba6034468e #0 Not tainted ----------------------------- fs/bcachefs/snapshot.h:45 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz.0.0/5106: #0: ffff88804bc80278 (&c->state_lock){+.+.}-{3:3}, at: bch2_fs_start+0x45/0x5b0 fs/bcachefs/super.c:1007 #1: ffff88804bc84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #1: ffff88804bc84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #1: ffff88804bc84398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3215 #2: ffff888012fc0128 (bcachefs_btree){+.+.}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #2: ffff888012fc0128 (bcachefs_btree){+.+.}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #2: ffff888012fc0128 (bcachefs_btree){+.+.}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3215 stack backtrace: CPU: 0 UID: 0 PID: 5106 Comm: syz.0.0 Not tainted 6.11.0-syzkaller-09015-g18ba6034468e #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 lockdep_rcu_suspicious+0x226/0x340 kernel/locking/lockdep.c:6802 snapshot_t fs/bcachefs/snapshot.h:45 [inline] bch2_snapshot_tree_oldest_subvol+0x485/0x550 fs/bcachefs/snapshot.c:473 snapshot_tree_ptr_repair fs/bcachefs/snapshot.c:714 [inline] check_snapshot fs/bcachefs/snapshot.c:836 [inline] bch2_check_snapshots+0x3f59/0x5320 fs/bcachefs/snapshot.c:889 bch2_run_recovery_pass+0xf0/0x1e0 fs/bcachefs/recovery_passes.c:185 bch2_run_recovery_passes+0x387/0x870 fs/bcachefs/recovery_passes.c:232 bch2_fs_recovery+0x24f9/0x38b0 fs/bcachefs/recovery.c:859 bch2_fs_start+0x356/0x5b0 fs/bcachefs/super.c:1037 bch2_fs_get_tree+0xd68/0x1710 fs/bcachefs/fs.c:2071 vfs_get_tree+0x90/0x2b0 fs/super.c:1800 do_new_mount+0x2be/0xb40 fs/namespace.c:3507 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4055 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4032 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb68d97f69a 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:00007fb68e6d5e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fb68e6d5ef0 RCX: 00007fb68d97f69a RDX: 0000000020005d80 RSI: 0000000020000240 RDI: 00007fb68e6d5eb0 RBP: 0000000020005d80 R08: 00007fb68e6d5ef0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000020000240 R13: 00007fb68e6d5eb0 R14: 0000000000005db9 R15: 0000000020000040 done bcachefs (loop0): bch2_fs_recovery(): error ERESTARTSYS bcachefs (loop0): bch2_fs_start(): error starting filesystem ERESTARTSYS bcachefs (loop0): shutting down bcachefs (loop0): shutdown complete bcachefs: bch2_fs_get_tree() error: ERESTARTSYS