====================================================== WARNING: possible circular locking dependency detected 6.14.0-rc1-syzkaller-g2014c95afece #0 Not tainted ------------------------------------------------------ syz.2.310/8444 is trying to acquire lock: ffff0000f1689760 (&bp->b_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff0000f1689760 (&bp->b_lock){+.+.}-{3:3}, at: xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] ffff0000f1689760 (&bp->b_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0xf44/0x1310 fs/xfs/xfs_buf.c:663 but task is already holding lock: ffff0000d3bc9180 (&bch->bc_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff0000d3bc9180 (&bch->bc_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0x3c0/0x1310 fs/xfs/xfs_buf.c:655 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&bch->bc_lock){+.+.}-{3:3}: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_rele_cached fs/xfs/xfs_buf.c:1093 [inline] xfs_buf_rele+0x200/0x127c fs/xfs/xfs_buf.c:1147 xfs_trans_brelse+0xf0/0x460 xfs_imap_lookup+0x268/0x5ec fs/xfs/libxfs/xfs_ialloc.c:2431 xfs_imap+0x44c/0xd84 fs/xfs/libxfs/xfs_ialloc.c:2514 xfs_iget_cache_miss fs/xfs/xfs_icache.c:644 [inline] xfs_iget+0x930/0x2d0c fs/xfs/xfs_icache.c:806 xfs_mountfs+0xf70/0x1c44 fs/xfs/xfs_mount.c:933 xfs_fs_fill_super+0xee4/0x1198 fs/xfs/xfs_super.c:1813 get_tree_bdev_flags+0x38c/0x494 fs/super.c:1636 get_tree_bdev+0x2c/0x3c fs/super.c:1659 xfs_fs_get_tree+0x28/0x38 fs/xfs/xfs_super.c:1860 vfs_get_tree+0x90/0x28c fs/super.c:1814 do_new_mount+0x278/0x900 fs/namespace.c:3560 path_mount+0x590/0xe04 fs/namespace.c:3887 do_mount fs/namespace.c:3900 [inline] __do_sys_mount fs/namespace.c:4111 [inline] __se_sys_mount fs/namespace.c:4088 [inline] __arm64_sys_mount+0x4d8/0x5ac fs/namespace.c:4088 __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 -> #0 (&bp->b_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] xfs_buf_find_insert+0xf44/0x1310 fs/xfs/xfs_buf.c:663 xfs_buf_get_map+0x1224/0x19a0 fs/xfs/xfs_buf.c:754 xfs_buf_read_map+0xe8/0x9f0 fs/xfs/xfs_buf.c:862 xfs_trans_read_buf_map+0x20c/0xae8 fs/xfs/xfs_trans_buf.c:304 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_imap_to_bp+0x140/0x2e0 fs/xfs/libxfs/xfs_inode_buf.c:139 xfs_iget_cache_miss fs/xfs/xfs_icache.c:664 [inline] xfs_iget+0x9e0/0x2d0c fs/xfs/xfs_icache.c:806 xfs_lookup+0x304/0x64c fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x14c/0x244 fs/xfs/xfs_iops.c:326 lookup_open fs/namei.c:3629 [inline] open_last_lookups fs/namei.c:3750 [inline] path_openat+0xf7c/0x2b1c fs/namei.c:3986 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1453 __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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&bch->bc_lock); lock(&bp->b_lock); lock(&bch->bc_lock); lock(&bp->b_lock); *** DEADLOCK *** 2 locks held by syz.2.310/8444: #0: ffff0000f169c130 (&inode->i_sb->s_type->i_mutex_dir_key#2){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:875 [inline] #0: ffff0000f169c130 (&inode->i_sb->s_type->i_mutex_dir_key#2){++++}-{4:4}, at: open_last_lookups fs/namei.c:3749 [inline] #0: ffff0000f169c130 (&inode->i_sb->s_type->i_mutex_dir_key#2){++++}-{4:4}, at: path_openat+0x674/0x2b1c fs/namei.c:3986 #1: ffff0000d3bc9180 (&bch->bc_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] #1: ffff0000d3bc9180 (&bch->bc_lock){+.+.}-{3:3}, at: xfs_buf_find_insert+0x3c0/0x1310 fs/xfs/xfs_buf.c:655 stack backtrace: CPU: 1 UID: 0 PID: 8444 Comm: syz.2.310 Not tainted 6.14.0-rc1-syzkaller-g2014c95afece #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (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_circular_bug+0x154/0x1c0 kernel/locking/lockdep.c:2076 check_noncircular+0x310/0x404 kernel/locking/lockdep.c:2208 check_prev_add kernel/locking/lockdep.c:3163 [inline] check_prevs_add kernel/locking/lockdep.c:3282 [inline] validate_chain kernel/locking/lockdep.c:3906 [inline] __lock_acquire+0x34f0/0x7904 kernel/locking/lockdep.c:5228 lock_acquire+0x23c/0x724 kernel/locking/lockdep.c:5851 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x48/0x60 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] xfs_buf_try_hold fs/xfs/xfs_buf.c:578 [inline] xfs_buf_find_insert+0xf44/0x1310 fs/xfs/xfs_buf.c:663 xfs_buf_get_map+0x1224/0x19a0 fs/xfs/xfs_buf.c:754 xfs_buf_read_map+0xe8/0x9f0 fs/xfs/xfs_buf.c:862 xfs_trans_read_buf_map+0x20c/0xae8 fs/xfs/xfs_trans_buf.c:304 xfs_trans_read_buf fs/xfs/xfs_trans.h:212 [inline] xfs_imap_to_bp+0x140/0x2e0 fs/xfs/libxfs/xfs_inode_buf.c:139 xfs_iget_cache_miss fs/xfs/xfs_icache.c:664 [inline] xfs_iget+0x9e0/0x2d0c fs/xfs/xfs_icache.c:806 xfs_lookup+0x304/0x64c fs/xfs/xfs_inode.c:553 xfs_vn_lookup+0x14c/0x244 fs/xfs/xfs_iops.c:326 lookup_open fs/namei.c:3629 [inline] open_last_lookups fs/namei.c:3750 [inline] path_openat+0xf7c/0x2b1c fs/namei.c:3986 do_filp_open+0x1e8/0x404 fs/namei.c:4016 do_sys_openat2+0x124/0x1b8 fs/open.c:1427 do_sys_open fs/open.c:1442 [inline] __do_sys_openat fs/open.c:1458 [inline] __se_sys_openat fs/open.c:1453 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1453 __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