====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.3.9262/26647 is trying to acquire lock: ffff88802df5e608 (sb_internal#3){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x67b/0xaf0 fs/ocfs2/quota_global.c:848 but task is already holding lock: ffff888059df0660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1e9/0x270 fs/ocfs2/quota_global.c:314 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #6 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 ocfs2_lock_global_qf+0x1e9/0x270 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x2a1/0xaf0 fs/ocfs2/quota_global.c:816 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x2b/0xf90 fs/quota/dquot.c:2831 quota_setquota+0x4b0/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x27b/0x950 fs/quota/quota.c:917 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 -> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}: down_write+0x97/0x1f0 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] ocfs2_lock_global_qf+0x1cb/0x270 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x2a1/0xaf0 fs/ocfs2/quota_global.c:816 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x2b/0xf90 fs/quota/dquot.c:2831 quota_setquota+0x4b0/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x27b/0x950 fs/quota/quota.c:917 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 -> #4 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x129/0xcc0 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:356 [inline] dqget+0x6fc/0xeb0 fs/quota/dquot.c:983 dquot_transfer+0x4b9/0x6d0 fs/quota/dquot.c:2163 ext4_setattr+0x87d/0x1c90 fs/ext4/inode.c:5477 notify_change+0xb0d/0xe10 fs/attr.c:499 chown_common+0x3f9/0x5a0 fs/open.c:783 do_fchownat+0x168/0x270 fs/open.c:814 __do_sys_chown fs/open.c:834 [inline] __se_sys_chown fs/open.c:832 [inline] __x64_sys_chown+0x82/0x90 fs/open.c:832 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 -> #3 (&ei->xattr_sem){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ext4_setattr+0x86b/0x1c90 fs/ext4/inode.c:5476 notify_change+0xb0d/0xe10 fs/attr.c:499 chown_common+0x3f9/0x5a0 fs/open.c:783 do_fchownat+0x168/0x270 fs/open.c:814 __do_sys_chown fs/open.c:834 [inline] __se_sys_chown fs/open.c:832 [inline] __x64_sys_chown+0x82/0x90 fs/open.c:832 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 -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x1e9d/0x20c0 fs/jbd2/transaction.c:448 jbd2__journal_start+0x2bb/0x5b0 fs/jbd2/transaction.c:505 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:544 ocfs2_start_trans+0x376/0x6c0 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x201/0xa10 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e2/0x890 fs/ocfs2/super.c:1883 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 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+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&journal->j_trans_barrier){.+.+}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 ocfs2_start_trans+0x36a/0x6c0 fs/ocfs2/journal.c:372 ocfs2_shutdown_local_alloc+0x201/0xa10 fs/ocfs2/localalloc.c:416 ocfs2_dismount_volume+0x1e2/0x890 fs/ocfs2/super.c:1883 generic_shutdown_super+0x134/0x2b0 fs/super.c:693 kill_block_super+0x44/0x90 fs/super.c:1660 deactivate_locked_super+0x97/0x100 fs/super.c:481 cleanup_mnt+0x429/0x4c0 fs/namespace.c:1250 task_work_run+0x1ce/0x250 kernel/task_work.c:239 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+0xf6/0x180 kernel/entry/common.c:210 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302 do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (sb_internal#3){.+.+}-{0:0}: 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 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x67b/0xaf0 fs/ocfs2/quota_global.c:848 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x2b/0xf90 fs/quota/dquot.c:2831 quota_setquota+0x4b0/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x27b/0x950 fs/quota/quota.c:917 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: Chain exists of: sb_internal#3 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7 --> &ocfs2_quota_ip_alloc_sem_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_quota_ip_alloc_sem_key); lock(&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7); lock(&ocfs2_quota_ip_alloc_sem_key); rlock(sb_internal#3); *** DEADLOCK *** 4 locks held by syz.3.9262/26647: #0: ffff88802df5e0e0 (&type->s_umount_key#94){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88802df5e0e0 (&type->s_umount_key#94){++++}-{3:3}, at: super_lock+0x167/0x360 fs/super.c:117 #1: ffff88804ff320a8 (&dquot->dq_lock){+.+.}-{3:3}, at: ocfs2_acquire_dquot+0x294/0xaf0 fs/ocfs2/quota_global.c:811 #2: ffff888059df09d8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #2: ffff888059df09d8 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#7){+.+.}-{3:3}, at: ocfs2_lock_global_qf+0x1cb/0x270 fs/ocfs2/quota_global.c:313 #3: ffff888059df0660 (&ocfs2_quota_ip_alloc_sem_key){++++}-{3:3}, at: ocfs2_lock_global_qf+0x1e9/0x270 fs/ocfs2/quota_global.c:314 stack backtrace: CPU: 1 PID: 26647 Comm: syz.3.9262 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025 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 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1633 [inline] sb_start_intwrite include/linux/fs.h:1755 [inline] ocfs2_start_trans+0x26b/0x6c0 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x67b/0xaf0 fs/ocfs2/quota_global.c:848 dqget+0x77c/0xeb0 fs/quota/dquot.c:988 dquot_set_dqblk+0x2b/0xf90 fs/quota/dquot.c:2831 quota_setquota+0x4b0/0x530 fs/quota/quota.c:310 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x27b/0x950 fs/quota/quota.c:917 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: 0033:0x7fc3db18eec9 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:00007fc3dbfbd038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007fc3db3e5fa0 RCX: 00007fc3db18eec9 RDX: 0000000000000000 RSI: 0000200000000100 RDI: ffffffff80000800 RBP: 00007fc3db211f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000440 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc3db3e6038 R14: 00007fc3db3e5fa0 R15: 00007ffe89a19fa8