====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.2.14/5922 is trying to acquire lock: ffff88805eb92658 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff88805eb92658 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}, at: __ocfs2_flush_truncate_log+0x351/0x10b0 fs/ocfs2/alloc.c:6047 but task is already holding lock: ffff8880594b5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] ffff8880594b5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: ocfs2_flush_truncate_log+0x47/0x60 fs/ocfs2/alloc.c:6076 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ocfs2_move_extent fs/ocfs2/move_extents.c:640 [inline] __ocfs2_move_extents_range+0x1a65/0x3360 fs/ocfs2/move_extents.c:860 ocfs2_move_extents+0x379/0x940 fs/ocfs2/move_extents.c:927 ocfs2_ioctl_move_extents+0x4e1/0x6c0 fs/ocfs2/move_extents.c:1053 ocfs2_ioctl+0x195/0x750 fs/ocfs2/ioctl.c:945 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] __ocfs2_flush_truncate_log+0x351/0x10b0 fs/ocfs2/alloc.c:6047 ocfs2_flush_truncate_log+0x4f/0x60 fs/ocfs2/alloc.c:6077 ocfs2_sync_fs+0x117/0x310 fs/ocfs2/super.c:402 sync_filesystem+0x1c2/0x220 fs/sync.c:66 ocfs2_remount+0xf6/0xa50 fs/ocfs2/super.c:611 reconfigure_super+0x21e/0x880 fs/super.c:1151 vfs_cmd_reconfigure fs/fsopen.c:267 [inline] vfs_fsconfig_locked+0x16c/0x320 fs/fsopen.c:296 __do_sys_fsconfig fs/fsopen.c:475 [inline] __se_sys_fsconfig+0x700/0x850 fs/fsopen.c:349 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#6); *** DEADLOCK *** 3 locks held by syz.2.14/5922: #0: ffff88802b23b070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:473 [inline] #0: ffff88802b23b070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x6d4/0x850 fs/fsopen.c:349 #1: ffff88802b5ba0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: vfs_cmd_reconfigure fs/fsopen.c:266 [inline] #1: ffff88802b5ba0e0 (&type->s_umount_key#53){+.+.}-{3:3}, at: vfs_fsconfig_locked+0x164/0x320 fs/fsopen.c:296 #2: ffff8880594b5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #2: ffff8880594b5118 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{3:3}, at: ocfs2_flush_truncate_log+0x47/0x60 fs/ocfs2/alloc.c:6076 stack backtrace: CPU: 0 PID: 5922 Comm: syz.2.14 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106 check_noncircular+0x2bd/0x3c0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2ddb/0x7c80 kernel/locking/lockdep.c:5137 lock_acquire+0x197/0x410 kernel/locking/lockdep.c:5754 down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] __ocfs2_flush_truncate_log+0x351/0x10b0 fs/ocfs2/alloc.c:6047 ocfs2_flush_truncate_log+0x4f/0x60 fs/ocfs2/alloc.c:6077 ocfs2_sync_fs+0x117/0x310 fs/ocfs2/super.c:402 sync_filesystem+0x1c2/0x220 fs/sync.c:66 ocfs2_remount+0xf6/0xa50 fs/ocfs2/super.c:611 reconfigure_super+0x21e/0x880 fs/super.c:1151 vfs_cmd_reconfigure fs/fsopen.c:267 [inline] vfs_fsconfig_locked+0x16c/0x320 fs/fsopen.c:296 __do_sys_fsconfig fs/fsopen.c:475 [inline] __se_sys_fsconfig+0x700/0x850 fs/fsopen.c:349 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe39f58ebe9 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:00007fe3a0361038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007fe39f7c5fa0 RCX: 00007fe39f58ebe9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000005 RBP: 00007fe39f611e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe39f7c6038 R14: 00007fe39f7c5fa0 R15: 00007ffc4702a968 (syz.2.14,5922,0):ocfs2_remount:623 ERROR: Cannot change heartbeat mode on remount