bcachefs (loop0): 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 done bcachefs (loop0): check_subvols... done bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): Fixed errors, running fsck a second time to verify fs is clean bcachefs (loop0): check_alloc_info... done bcachefs (loop0): check_lrus... done bcachefs (loop0): check_btree_backpointers... done bcachefs (loop0): check_backpointers_to_extents... done bcachefs (loop0): check_extents_to_backpointers... bcachefs (loop0): scanning for missing backpointers in 1/128 buckets done bcachefs (loop0): check_alloc_to_lru_refs... done bcachefs (loop0): bucket_gens_init... done bcachefs (loop0): check_snapshot_trees... done bcachefs (loop0): check_snapshots... done bcachefs (loop0): check_subvols... done bcachefs (loop0): check_subvol_children... done bcachefs (loop0): delete_dead_snapshots... done bcachefs (loop0): check_inodes... done bcachefs (loop0): check_extents... done bcachefs (loop0): check_indirect_extents... done bcachefs (loop0): check_dirents... done bcachefs (loop0): check_xattrs... done bcachefs (loop0): check_root... done bcachefs (loop0): check_unreachable_inodes... done bcachefs (loop0): check_subvolume_structure... done bcachefs (loop0): check_directory_structure... done bcachefs (loop0): check_nlinks... done bcachefs (loop0): resume_logged_ops... done bcachefs (loop0): delete_dead_inodes... done bcachefs (loop0): set_fs_needs_rebalance... done bcachefs (loop0): done starting filesystem evm: overlay not supported ============================================ WARNING: possible recursive locking detected 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 Not tainted -------------------------------------------- syz.0.0/5314 is trying to acquire lock: ffff888052085fa8 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff888052085fa8 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: bch2_symlink+0xf2/0x240 fs/bcachefs/fs.c:885 but task is already holding lock: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_workdir fs/overlayfs/copy_up.c:782 [inline] ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline] ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_flags+0x10ee/0x2fb0 fs/overlayfs/copy_up.c:1257 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&sb->s_type->i_mutex_key#19); lock(&sb->s_type->i_mutex_key#19); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz.0.0/5314: #0: ffff88803ea1e420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:556 #1: ffff888052082418 (&ovl_i_mutex_key[depth]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888052082418 (&ovl_i_mutex_key[depth]){+.+.}-{4:4}, at: chown_common+0x313/0x5a0 fs/open.c:772 #2: ffff8880520827d0 (&ovl_i_lock_key[depth]){+.+.}-{4:4}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:649 [inline] #2: ffff8880520827d0 (&ovl_i_lock_key[depth]){+.+.}-{4:4}, at: ovl_copy_up_start+0x56/0x310 fs/overlayfs/util.c:727 #3: ffff88805502e420 (sb_writers#12){.+.+}-{0:0}, at: ovl_copy_up_workdir fs/overlayfs/copy_up.c:781 [inline] #3: ffff88805502e420 (sb_writers#12){.+.+}-{0:0}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline] #3: ffff88805502e420 (sb_writers#12){.+.+}-{0:0}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] #3: ffff88805502e420 (sb_writers#12){.+.+}-{0:0}, at: ovl_copy_up_flags+0x10df/0x2fb0 fs/overlayfs/copy_up.c:1257 #4: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #4: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_workdir fs/overlayfs/copy_up.c:782 [inline] #4: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline] #4: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] #4: ffff888052085078 (&sb->s_type->i_mutex_key#19){++++}-{4:4}, at: ovl_copy_up_flags+0x10ee/0x2fb0 fs/overlayfs/copy_up.c:1257 stack backtrace: CPU: 0 UID: 0 PID: 5314 Comm: syz.0.0 Not tainted 6.15.0-rc3-syzkaller-00342-g5bc1018675ec #0 PREEMPT(full) 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_lvl+0x189/0x250 lib/dump_stack.c:120 print_deadlock_bug+0x28b/0x2a0 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain+0x1a3f/0x2140 kernel/locking/lockdep.c:3896 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] bch2_symlink+0xf2/0x240 fs/bcachefs/fs.c:885 vfs_symlink+0x140/0x2f0 fs/namei.c:4723 ovl_do_symlink+0x89/0xd0 fs/overlayfs/overlayfs.h:268 ovl_create_real+0x228/0x3f0 fs/overlayfs/dir.c:176 ovl_copy_up_workdir fs/overlayfs/copy_up.c:783 [inline] ovl_do_copy_up fs/overlayfs/copy_up.c:1001 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1202 [inline] ovl_copy_up_flags+0x1108/0x2fb0 fs/overlayfs/copy_up.c:1257 ovl_setattr+0x10b/0x550 fs/overlayfs/inode.c:40 notify_change+0xb33/0xe40 fs/attr.c:552 chown_common+0x3f9/0x5a0 fs/open.c:782 do_fchownat+0x161/0x270 fs/open.c:813 __do_sys_lchown fs/open.c:838 [inline] __se_sys_lchown fs/open.c:836 [inline] __x64_sys_lchown+0x85/0xa0 fs/open.c:836 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: 0033:0x7f76cd58e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f76ce3aa038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007f76cd7b5fa0 RCX: 00007f76cd58e969 RDX: 000000000000ee01 RSI: ffffffffffffffff RDI: 0000200000000e40 RBP: 00007f76cd610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f76cd7b5fa0 R15: 00007ffed8033478