====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Tainted: G L ------------------------------------------------------ syz.0.2179/13319 is trying to acquire lock: ffff88804e133f60 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}, at: ocfs2_lock_global_qf+0x1c3/0x2a0 fs/ocfs2/quota_global.c:314 but task is already holding lock: ffff88804e1342c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] ffff88804e1342c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_lock_global_qf+0x196/0x2a0 fs/ocfs2/quota_global.c:313 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}: down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1027 [inline] ocfs2_lock_global_qf+0x196/0x2a0 fs/ocfs2/quota_global.c:313 ocfs2_acquire_dquot+0x255/0xae0 fs/ocfs2/quota_global.c:828 dqget+0x666/0x1130 fs/quota/dquot.c:980 __dquot_initialize+0x5a5/0xd70 fs/quota/dquot.c:1508 ocfs2_get_init_inode+0xe9/0x1b0 fs/ocfs2/namei.c:206 ocfs2_mknod+0xd5f/0x2750 fs/ocfs2/namei.c:314 ocfs2_mkdir+0xf2/0x3f0 fs/ocfs2/namei.c:660 vfs_mkdir+0x729/0xb50 fs/namei.c:5139 do_mkdirat+0x435/0x590 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x112/0x170 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (&dquot->dq_lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:614 [inline] __mutex_lock+0x1a2/0x1b90 kernel/locking/mutex.c:776 wait_on_dquot fs/quota/dquot.c:357 [inline] dqget+0x5c7/0x1130 fs/quota/dquot.c:975 __dquot_initialize+0x5a5/0xd70 fs/quota/dquot.c:1508 ocfs2_get_init_inode+0xe9/0x1b0 fs/ocfs2/namei.c:206 ocfs2_mknod+0xd5f/0x2750 fs/ocfs2/namei.c:314 ocfs2_mkdir+0xf2/0x3f0 fs/ocfs2/namei.c:660 vfs_mkdir+0x729/0xb50 fs/namei.c:5139 do_mkdirat+0x435/0x590 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x112/0x170 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}: down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1027 [inline] ocfs2_remove_inode+0x15b/0x860 fs/ocfs2/inode.c:733 ocfs2_wipe_inode+0x6db/0x11f0 fs/ocfs2/inode.c:896 ocfs2_delete_inode fs/ocfs2/inode.c:1157 [inline] ocfs2_evict_inode+0x7b9/0x13c0 fs/ocfs2/inode.c:1299 evict+0x3c2/0xad0 fs/inode.c:837 iput_final fs/inode.c:1954 [inline] iput.part.0+0x624/0x1150 fs/inode.c:2006 iput+0x35/0x40 fs/inode.c:1969 ocfs2_dentry_iput+0x139/0x330 fs/ocfs2/dcache.c:407 dentry_unlink_inode+0x282/0x490 fs/dcache.c:465 __dentry_kill+0x1d0/0x600 fs/dcache.c:670 finish_dput+0x76/0x480 fs/dcache.c:879 dput.part.0+0x456/0x570 fs/dcache.c:928 dput+0x1f/0x30 fs/dcache.c:920 ovl_check_rename_whiteout+0x40c/0x620 fs/overlayfs/super.c:622 ovl_make_workdir fs/overlayfs/super.c:717 [inline] ovl_get_workdir fs/overlayfs/super.c:840 [inline] ovl_fill_super_creds fs/overlayfs/super.c:1453 [inline] ovl_fill_super+0x11bb/0x5db0 fs/overlayfs/super.c:1567 vfs_get_super fs/super.c:1324 [inline] get_tree_nodev+0xdd/0x190 fs/super.c:1343 vfs_get_tree+0x92/0x320 fs/super.c:1751 fc_mount fs/namespace.c:1199 [inline] do_new_mount_fc fs/namespace.c:3636 [inline] do_new_mount fs/namespace.c:3712 [inline] path_mount+0x7d0/0x23c0 fs/namespace.c:4022 do_mount fs/namespace.c:4035 [inline] __do_sys_mount fs/namespace.c:4224 [inline] __se_sys_mount fs/namespace.c:4201 [inline] __x64_sys_mount+0x293/0x310 fs/namespace.c:4201 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&ocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE]){+.+.}-{4:4}: down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 inode_lock include/linux/fs.h:1027 [inline] ocfs2_del_inode_from_orphan+0x112/0x700 fs/ocfs2/namei.c:2731 ocfs2_dio_end_io_write+0x2cd/0xee0 fs/ocfs2/aops.c:2306 ocfs2_dio_end_io+0x136/0x2c0 fs/ocfs2/aops.c:2404 dio_complete+0x224/0x950 fs/direct-io.c:281 __blockdev_direct_IO+0x309f/0x3ae0 fs/direct-io.c:1303 ocfs2_direct_IO+0x263/0x360 fs/ocfs2/aops.c:2441 generic_file_direct_write+0x198/0x410 mm/filemap.c:4248 __generic_file_write_iter+0x11b/0x240 mm/filemap.c:4417 ocfs2_file_write_iter+0xd79/0x2160 fs/ocfs2/file.c:2475 iter_file_splice_write+0x82b/0x10a0 fs/splice.c:738 do_splice_from fs/splice.c:938 [inline] direct_splice_actor+0x192/0x6c0 fs/splice.c:1161 splice_direct_to_actor+0x345/0xa30 fs/splice.c:1105 do_splice_direct_actor fs/splice.c:1204 [inline] do_splice_direct+0x174/0x240 fs/splice.c:1230 do_sendfile+0xadc/0xe20 fs/read_write.c:1370 __do_sys_sendfile64 fs/read_write.c:1431 [inline] __se_sys_sendfile64 fs/read_write.c:1417 [inline] __x64_sys_sendfile64+0x1d8/0x220 fs/read_write.c:1417 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ocfs2_quota_ip_alloc_sem_key){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x17c/0x330 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_lock_global_qf+0x1c3/0x2a0 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x255/0xae0 fs/ocfs2/quota_global.c:828 dqget+0x666/0x1130 fs/quota/dquot.c:980 __dquot_initialize+0x5a5/0xd70 fs/quota/dquot.c:1508 ocfs2_get_init_inode+0xe9/0x1b0 fs/ocfs2/namei.c:206 ocfs2_mknod+0xd5f/0x2750 fs/ocfs2/namei.c:314 ocfs2_mkdir+0xf2/0x3f0 fs/ocfs2/namei.c:660 vfs_mkdir+0x729/0xb50 fs/namei.c:5139 do_mkdirat+0x435/0x590 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x112/0x170 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 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: &ocfs2_quota_ip_alloc_sem_key --> &dquot->dq_lock --> &ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE] Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]); lock(&dquot->dq_lock); lock(&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]); lock(&ocfs2_quota_ip_alloc_sem_key); *** DEADLOCK *** 5 locks held by syz.0.2179/13319: #0: ffff888032d74420 (sb_writers#17){.+.+}-{0:0}, at: filename_create+0x10d/0x400 fs/namei.c:4881 #1: ffff88804e10ed80 (&type->i_mutex_dir_key#12/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1072 [inline] #1: ffff88804e10ed80 (&type->i_mutex_dir_key#12/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2873 [inline] #1: ffff88804e10ed80 (&type->i_mutex_dir_key#12/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2884 [inline] #1: ffff88804e10ed80 (&type->i_mutex_dir_key#12/1){+.+.}-{4:4}, at: filename_create+0x1c0/0x400 fs/namei.c:4888 #2: ffff88806c6f9800 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #2: ffff88806c6f9800 (&ocfs2_sysfile_lock_key[INODE_ALLOC_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_reserve_suballoc_bits+0x11c/0x49f0 fs/ocfs2/suballoc.c:789 #3: ffff88804e1260a8 (&dquot->dq_lock){+.+.}-{4:4}, at: ocfs2_acquire_dquot+0x248/0xae0 fs/ocfs2/quota_global.c:823 #4: ffff88804e1342c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1027 [inline] #4: ffff88804e1342c0 (&ocfs2_sysfile_lock_key[USER_QUOTA_SYSTEM_INODE]){+.+.}-{4:4}, at: ocfs2_lock_global_qf+0x196/0x2a0 fs/ocfs2/quota_global.c:313 stack backtrace: CPU: 1 UID: 0 PID: 13319 Comm: syz.0.2179 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1c7 kernel/locking/lockdep.c:2043 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain kernel/locking/lockdep.c:3908 [inline] __lock_acquire+0x14b8/0x2630 kernel/locking/lockdep.c:5237 lock_acquire kernel/locking/lockdep.c:5868 [inline] lock_acquire+0x17c/0x330 kernel/locking/lockdep.c:5825 down_write+0x8b/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_lock_global_qf+0x1c3/0x2a0 fs/ocfs2/quota_global.c:314 ocfs2_acquire_dquot+0x255/0xae0 fs/ocfs2/quota_global.c:828 dqget+0x666/0x1130 fs/quota/dquot.c:980 __dquot_initialize+0x5a5/0xd70 fs/quota/dquot.c:1508 ocfs2_get_init_inode+0xe9/0x1b0 fs/ocfs2/namei.c:206 ocfs2_mknod+0xd5f/0x2750 fs/ocfs2/namei.c:314 ocfs2_mkdir+0xf2/0x3f0 fs/ocfs2/namei.c:660 vfs_mkdir+0x729/0xb50 fs/namei.c:5139 do_mkdirat+0x435/0x590 fs/namei.c:5173 __do_sys_mkdirat fs/namei.c:5195 [inline] __se_sys_mkdirat fs/namei.c:5193 [inline] __x64_sys_mkdirat+0x112/0x170 fs/namei.c:5193 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc348d99d97 Code: 00 66 90 48 89 f2 b9 00 01 00 00 48 89 fe bf 9c ff ff ff e9 db f7 ff ff 66 2e 0f 1f 84 00 00 00 00 00 90 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc349d1be58 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007fc349d1bee0 RCX: 00007fc348d99d97 RDX: 00000000000001ff RSI: 00002000000000c0 RDI: 00000000ffffff9c RBP: 0000200000000300 R08: 0000200000000000 R09: 0000000000000000 R10: 0000200000000300 R11: 0000000000000246 R12: 00002000000000c0 R13: 00007fc349d1bea0 R14: 0000000000000000 R15: 0000000000000000