bcachefs (loop0): starting version 1.7: mi_btree_bitmap opts=metadata_checksum=none,data_checksum=xxhash,compression=lz4,journal_flush_disabled,fsck,norecovery,nojournal_transaction_names,reconstruct_alloc
============================================
WARNING: possible recursive locking detected
6.12.0-rc3-syzkaller-g9ec59cb3edc7 #0 Tainted: G W
--------------------------------------------
syz.0.21/6551 is trying to acquire lock:
ffff0000f1380908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_replicas_entry_validate+0x34/0x88 fs/bcachefs/replicas.c:101
but task is already holding lock:
ffff0000f1380908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_read_superblock_clean+0x44/0x444 fs/bcachefs/sb-clean.c:149
other info that might help us debug this:
Possible unsafe locking scenario:
CPU0
----
lock(&c->sb_lock);
lock(&c->sb_lock);
*** DEADLOCK ***
May be due to missing lock nesting notation
2 locks held by syz.0.21/6551:
#0: ffff0000f1380278 (&c->state_lock){+.+.}-{3:3}, at: bch2_fs_start+0x50/0x53c fs/bcachefs/super.c:1007
#1: ffff0000f1380908 (&c->sb_lock){+.+.}-{3:3}, at: bch2_read_superblock_clean+0x44/0x444 fs/bcachefs/sb-clean.c:149
stack backtrace:
CPU: 1 UID: 0 PID: 6551 Comm: syz.0.21 Tainted: G W 6.12.0-rc3-syzkaller-g9ec59cb3edc7 #0
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:484 (C)
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120
dump_stack+0x1c/0x28 lib/dump_stack.c:129
print_deadlock_bug+0x4e8/0x668 kernel/locking/lockdep.c:3037
check_deadlock kernel/locking/lockdep.c:3089 [inline]
validate_chain kernel/locking/lockdep.c:3891 [inline]
__lock_acquire+0x6180/0x77c8 kernel/locking/lockdep.c:5202
lock_acquire+0x240/0x728 kernel/locking/lockdep.c:5825
__mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:608
__mutex_lock kernel/locking/mutex.c:752 [inline]
mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:804
bch2_replicas_entry_validate+0x34/0x88 fs/bcachefs/replicas.c:101
journal_entry_data_usage_validate+0x268/0x5ac fs/bcachefs/journal_io.c:608
bch2_journal_entry_validate+0xb8/0xec fs/bcachefs/journal_io.c:830
bch2_sb_clean_validate_late fs/bcachefs/sb-clean.c:40 [inline]
bch2_read_superblock_clean+0x1ac/0x444 fs/bcachefs/sb-clean.c:168
bch2_fs_recovery+0x1b8/0x55a0 fs/bcachefs/recovery.c:639
bch2_fs_start+0x30c/0x53c fs/bcachefs/super.c:1037
bch2_fs_get_tree+0x938/0x1030 fs/bcachefs/fs.c:2078
vfs_get_tree+0x90/0x28c fs/super.c:1800
do_new_mount+0x278/0x900 fs/namespace.c:3507
path_mount+0x590/0xe04 fs/namespace.c:3834
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4055 [inline]
__se_sys_mount fs/namespace.c:4032 [inline]
__arm64_sys_mount+0x45c/0x5a8 fs/namespace.c:4032
__invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49
el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132
do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151
el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744
el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762
el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600