ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode. ====================================================== WARNING: possible circular locking dependency detected 6.1.146-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.186/5134 is trying to acquire lock: ffff0000d9e24348 (&mm->mmap_lock){++++}-{3:3}, at: __might_fault+0x9c/0x124 mm/memory.c:5851 but task is already holding lock: ffff0000f5ca3f60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_fiemap+0x258/0x9b0 fs/ocfs2/extent_map.c:755 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}: down_read+0x64/0x304 kernel/locking/rwsem.c:1520 ocfs2_read_virt_blocks+0x244/0x8e0 fs/ocfs2/extent_map.c:976 ocfs2_read_dir_block fs/ocfs2/dir.c:508 [inline] ocfs2_find_entry_el fs/ocfs2/dir.c:715 [inline] ocfs2_find_entry+0x318/0x1c5c fs/ocfs2/dir.c:1091 ocfs2_find_files_on_disk+0x128/0x410 fs/ocfs2/dir.c:1995 ocfs2_lookup_ino_from_name+0x60/0x114 fs/ocfs2/dir.c:2017 ocfs2_find_victim_alloc_group+0x198/0x7c0 fs/ocfs2/move_extents.c:379 ocfs2_move_extent fs/ocfs2/move_extents.c:650 [inline] __ocfs2_move_extents_range+0x154c/0x2aac fs/ocfs2/move_extents.c:860 ocfs2_move_extents+0x314/0x7e0 fs/ocfs2/move_extents.c:927 ocfs2_ioctl_move_extents+0x3fc/0x5c8 fs/ocfs2/move_extents.c:1053 ocfs2_ioctl+0x204/0xaf4 fs/ocfs2/ioctl.c:930 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (jbd2_handle){++++}-{0:0}: start_this_handle+0xfe0/0x122c fs/jbd2/transaction.c:463 jbd2__journal_start+0x288/0x51c fs/jbd2/transaction.c:520 __ext4_journal_start_sb+0x2fc/0x674 fs/ext4/ext4_jbd2.c:105 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x9c/0x100 fs/ext4/inode.c:6116 __mark_inode_dirty+0x2e8/0x12a0 fs/fs-writeback.c:2433 generic_update_time fs/inode.c:1946 [inline] inode_update_time fs/inode.c:1959 [inline] touch_atime+0x40c/0x7d0 fs/inode.c:2031 file_accessed include/linux/fs.h:2600 [inline] ext4_file_mmap+0x140/0x2f8 fs/ext4/file.c:780 call_mmap include/linux/fs.h:2270 [inline] mmap_file+0x6c/0xc8 mm/util.c:1109 __mmap_region mm/mmap.c:2768 [inline] mmap_region+0xcc8/0x1860 mm/mmap.c:2912 do_mmap+0x978/0x10dc mm/mmap.c:1432 vm_mmap_pgoff+0x184/0x284 mm/util.c:520 ksys_mmap_pgoff+0x3b8/0x5a0 mm/mmap.c:1478 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __might_fault+0xc4/0x124 mm/memory.c:5852 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] fiemap_fill_next_extent+0x15c/0x3b4 fs/ioctl.c:144 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0x75c/0x9b0 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1694/0x206c fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: &mm->mmap_lock --> jbd2_handle --> &ocfs2_file_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_file_ip_alloc_sem_key); lock(jbd2_handle); lock(&ocfs2_file_ip_alloc_sem_key); lock(&mm->mmap_lock); *** DEADLOCK *** 1 lock held by syz.0.186/5134: #0: ffff0000f5ca3f60 (&ocfs2_file_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_fiemap+0x258/0x9b0 fs/ocfs2/extent_map.c:755 stack backtrace: CPU: 1 PID: 5134 Comm: syz.0.186 Not tainted 6.1.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x240/0x2d4 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x293c/0x6544 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x644 kernel/locking/lockdep.c:5662 __might_fault+0xc4/0x124 mm/memory.c:5852 _copy_to_user include/linux/uaccess.h:143 [inline] copy_to_user include/linux/uaccess.h:169 [inline] fiemap_fill_next_extent+0x15c/0x3b4 fs/ioctl.c:144 ocfs2_fiemap_inline fs/ocfs2/extent_map.c:725 [inline] ocfs2_fiemap+0x75c/0x9b0 fs/ocfs2/extent_map.c:762 ioctl_fiemap fs/ioctl.c:219 [inline] do_vfs_ioctl+0x1694/0x206c fs/ioctl.c:810 __do_sys_ioctl fs/ioctl.c:868 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0xe4/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585