====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/4279 is trying to acquire lock: ffff88805156c990 (jbd2_handle){++++}-{0:0}, at: jbd2_journal_lock_updates+0x8f/0x390 fs/jbd2/transaction.c:880 but task is already holding lock: ffff8880540a42c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] ffff8880540a42c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6075 [inline] ffff8880540a42c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}, at: ocfs2_truncate_log_shutdown+0x136/0x2f0 fs/ocfs2/alloc.c:6320 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:758 [inline] ocfs2_try_to_free_truncate_log+0xb1/0x350 fs/ocfs2/alloc.c:6124 ocfs2_reserve_clusters_with_limit+0x48a/0xc10 fs/ocfs2/suballoc.c:1180 ocfs2_reserve_clusters fs/ocfs2/suballoc.c:1223 [inline] ocfs2_lock_allocators+0x2d5/0x5f0 fs/ocfs2/suballoc.c:2679 ocfs2_extend_allocation+0x3fe/0x1930 fs/ocfs2/file.c:585 ocfs2_extend_no_holes+0x206/0x4b0 fs/ocfs2/file.c:1027 ocfs2_acquire_dquot+0x5fb/0xb20 fs/ocfs2/quota_global.c:841 dqget+0x778/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c8/0x25b0 fs/ocfs2/namei.c:310 ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0x1181/0x2ee0 fs/namei.c:3788 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #3 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ocfs2_create_local_dquot+0x1a5/0x18e0 fs/ocfs2/quota_local.c:1224 ocfs2_acquire_dquot+0x7c6/0xb20 fs/ocfs2/quota_global.c:871 dqget+0x778/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3c3/0xcd0 fs/quota/dquot.c:1517 ocfs2_get_init_inode+0x144/0x1b0 fs/ocfs2/namei.c:202 ocfs2_mknod+0x8c8/0x25b0 fs/ocfs2/namei.c:310 ocfs2_create+0x1b6/0x4b0 fs/ocfs2/namei.c:674 lookup_open fs/namei.c:3490 [inline] open_last_lookups fs/namei.c:3558 [inline] path_openat+0x1181/0x2ee0 fs/namei.c:3788 do_filp_open+0x1f1/0x430 fs/namei.c:3818 do_sys_openat2+0x150/0x4b0 fs/open.c:1320 do_sys_open fs/open.c:1336 [inline] __do_sys_openat fs/open.c:1352 [inline] __se_sys_openat fs/open.c:1347 [inline] __x64_sys_openat+0x135/0x160 fs/open.c:1347 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #2 (&dquot->dq_lock ){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12d/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6817 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_alloc_space+0x5fc/0xe60 fs/quota/dquot.c:1752 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0xfc4/0x4610 fs/ext4/mballoc.c:5740 ext4_ext_map_blocks+0x195b/0x6810 fs/ext4/extents.c:4346 ext4_map_blocks+0x9de/0x1b70 fs/ext4/inode.c:681 _ext4_get_block+0x1e7/0x540 fs/ext4/inode.c:824 ext4_block_write_begin+0x644/0x1300 fs/ext4/inode.c:1126 ext4_write_begin+0x629/0xf80 fs/ext4/ext4_jbd2.h:-1 generic_perform_write+0x2fa/0x5c0 mm/filemap.c:3862 ext4_buffered_write_iter+0x11a/0x390 fs/ext4/file.c:285 ext4_file_write_iter+0x1cf/0x1710 fs/ext4/file.c:-1 call_write_iter include/linux/fs.h:2265 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x4b1/0xa30 fs/read_write.c:584 ksys_write+0x14c/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&ei->i_data_sem){++++}-{3:3}: down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_truncate+0x999/0x1240 fs/ext4/inode.c:4297 ext4_setattr+0x11f8/0x1b50 fs/ext4/inode.c:5668 notify_change+0xc74/0xf40 fs/attr.c:499 do_truncate+0x1ac/0x240 fs/open.c:65 do_sys_ftruncate+0x312/0x3c0 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (jbd2_handle){++++}-{0:0}: 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+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 jbd2_journal_lock_updates+0xa8/0x390 fs/jbd2/transaction.c:880 __ocfs2_flush_truncate_log+0x2cf/0x1220 fs/ocfs2/alloc.c:6029 ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6076 [inline] ocfs2_truncate_log_shutdown+0x13e/0x2f0 fs/ocfs2/alloc.c:6320 ocfs2_dismount_volume+0x207/0x940 fs/ocfs2/super.c:1884 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7c/0xe0 fs/super.c:1470 deactivate_locked_super+0x93/0xf0 fs/super.c:332 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: jbd2_handle --> &ocfs2_quota_ip_alloc_sem_key --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type] #8 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type] #8); lock(&ocfs2_quota_ip_alloc_sem_key); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type] #8); lock(jbd2_handle ); *** DEADLOCK *** 2 locks held by syz-executor/4279: #0: ffff8881413ce0e0 (&type->s_umount_key#71){+.+.}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:362 #1: ffff8880540a42c8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#8){+.+.}-{3:3} , at: inode_lock include/linux/fs.h:758 [inline] , at: ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6075 [inline] , at: ocfs2_truncate_log_shutdown+0x136/0x2f0 fs/ocfs2/alloc.c:6320 stack backtrace: CPU: 1 PID: 4279 Comm: syz-executor Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 check_noncircular+0x296/0x330 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+0x2d07/0x7d10 kernel/locking/lockdep.c:5049 lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5662 jbd2_journal_lock_updates+0xa8/0x390 fs/jbd2/transaction.c:880 __ocfs2_flush_truncate_log+0x2cf/0x1220 fs/ocfs2/alloc.c:6029 ocfs2_flush_truncate_log fs/ocfs2/alloc.c:6076 [inline] ocfs2_truncate_log_shutdown+0x13e/0x2f0 fs/ocfs2/alloc.c:6320 ocfs2_dismount_volume+0x207/0x940 fs/ocfs2/super.c:1884 generic_shutdown_super+0x130/0x340 fs/super.c:501 kill_block_super+0x7c/0xe0 fs/super.c:1470 deactivate_locked_super+0x93/0xf0 fs/super.c:332 cleanup_mnt+0x42c/0x4b0 fs/namespace.c:1191 task_work_run+0x1d0/0x260 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline] syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:303 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f62da79da57 Code: a2 c7 05 9c fc 24 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffc406a40e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f62da832048 RCX: 00007f62da79da57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc406a41a0 RBP: 00007ffc406a41a0 R08: 00007ffc406a51a0 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc406a5230 R13: 00007f62da832048 R14: 0000000000034846 R15: 00007ffc406a5270 ocfs2: Unmounting device (7,2) on (node local)