====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc1-syzkaller-00236-g8c6bc74c7f89 #0 Not tainted ------------------------------------------------------ syz.6.7024/26309 is trying to acquire lock: ffff8880666d0618 (sb_internal#2){.+.+}-{0:0}, at: ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 but task is already holding lock: ffff888053cedbe0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1c1/0x2d0 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){++++}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 ocfs2_lock_global_qf+0x1c1/0x2d0 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x258/0xb00 fs/ocfs2/quota_global.c:828 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #5 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}: down_write+0x92/0x200 kernel/locking/rwsem.c:1577 inode_lock include/linux/fs.h:867 [inline] ocfs2_lock_global_qf+0x194/0x2d0 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x258/0xb00 fs/ocfs2/quota_global.c:828 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #4 (&dquot->dq_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:747 wait_on_dquot fs/quota/dquot.c:354 [inline] dqget+0x5f1/0x1180 fs/quota/dquot.c:972 dquot_transfer+0x3a8/0x6a0 fs/quota/dquot.c:2140 ext4_setattr+0x885/0x2ae0 fs/ext4/inode.c:5817 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x54e/0x680 fs/open.c:790 do_fchownat+0x1a7/0x200 fs/open.c:821 __do_sys_lchown fs/open.c:846 [inline] __se_sys_lchown fs/open.c:844 [inline] __x64_sys_lchown+0x7e/0xc0 fs/open.c:844 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&ei->xattr_sem){++++}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 ext4_setattr+0x875/0x2ae0 fs/ext4/inode.c:5816 notify_change+0x6a9/0x1230 fs/attr.c:552 chown_common+0x54e/0x680 fs/open.c:790 do_fchownat+0x1a7/0x200 fs/open.c:821 __do_sys_chown fs/open.c:841 [inline] __se_sys_chown fs/open.c:839 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:839 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (jbd2_handle){++++}-{0:0}: start_this_handle+0x5ea/0x1410 fs/jbd2/transaction.c:444 jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501 jbd2_journal_start+0x29/0x40 fs/jbd2/transaction.c:540 ocfs2_start_trans+0x3b9/0x970 fs/ocfs2/journal.c:374 ocfs2_shutdown_local_alloc+0x281/0xa10 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1f5/0xa00 fs/ocfs2/super.c:1825 generic_shutdown_super+0x156/0x390 fs/super.c:643 kill_block_super+0x3b/0x90 fs/super.c:1753 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474 deactivate_super fs/super.c:507 [inline] deactivate_super+0xde/0x100 fs/super.c:503 cleanup_mnt+0x225/0x450 fs/namespace.c:1417 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&journal->j_trans_barrier){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 ocfs2_start_trans+0x3ae/0x970 fs/ocfs2/journal.c:372 ocfs2_shutdown_local_alloc+0x281/0xa10 fs/ocfs2/localalloc.c:417 ocfs2_dismount_volume+0x1f5/0xa00 fs/ocfs2/super.c:1825 generic_shutdown_super+0x156/0x390 fs/super.c:643 kill_block_super+0x3b/0x90 fs/super.c:1753 deactivate_locked_super+0xc1/0x1a0 fs/super.c:474 deactivate_super fs/super.c:507 [inline] deactivate_super+0xde/0x100 fs/super.c:503 cleanup_mnt+0x225/0x450 fs/namespace.c:1417 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:114 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (sb_internal#2){.+.+}-{0:0}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1793 [inline] sb_start_intwrite include/linux/fs.h:1976 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: sb_internal#2 --> &ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5 --> &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]#5); lock(&ocfs2_quota_ip_alloc_sem_key); rlock(sb_internal#2); *** DEADLOCK *** 4 locks held by syz.6.7024/26309: #0: ffff8880666d00e0 (&type->s_umount_key#82){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline] #0: ffff8880666d00e0 (&type->s_umount_key#82){++++}-{4:4}, at: super_lock+0x31c/0x3f0 fs/super.c:121 #1: ffff888073b0e0a8 (&dquot->dq_lock){+.+.}-{4:4}, at: ocfs2_acquire_dquot+0x24b/0xb00 fs/ocfs2/quota_global.c:823 #2: ffff888053cedf40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #2: ffff888053cedf40 (&ocfs2_sysfile_lock_key[args->fi_sysfile_type]#5){+.+.}-{4:4}, at: ocfs2_lock_global_qf+0x194/0x2d0 fs/ocfs2/quota_global.c:313 #3: ffff888053cedbe0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1c1/0x2d0 fs/ocfs2/quota_global.c:314 stack backtrace: CPU: 1 UID: 0 PID: 26309 Comm: syz.6.7024 Not tainted 6.16.0-rc1-syzkaller-00236-g8c6bc74c7f89 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline] percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline] __sb_start_write include/linux/fs.h:1793 [inline] sb_start_intwrite include/linux/fs.h:1976 [inline] ocfs2_start_trans+0x29d/0x970 fs/ocfs2/journal.c:370 ocfs2_acquire_dquot+0x563/0xb00 fs/ocfs2/quota_global.c:860 dqget+0x693/0x1180 fs/quota/dquot.c:977 dquot_set_dqblk+0x2b/0x1290 fs/quota/dquot.c:2820 quota_setquota+0x4c4/0x5e0 fs/quota/quota.c:310 do_quotactl+0xaf6/0x13d0 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl fs/quota/quota.c:917 [inline] __x64_sys_quotactl+0x1b3/0x440 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9fe738e929 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:00007f9fe812a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f9fe75b5fa0 RCX: 00007f9fe738e929 RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000801 RBP: 00007f9fe7410b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000180 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9fe75b5fa0 R15: 00007ffd3a484148