EXT4-fs (loop3): mounted filesystem without journal. Opts: errors=remount-ro,nodiscard,noquota,init_itable,quota,errors=continue,sysvgroups,bsddf,dioread_lock,. Quota mode: writeback. ext4 filesystem being mounted at /0/file1 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 5.15.167-syzkaller #0 Not tainted ------------------------------------------------------ syz.3.471/6531 is trying to acquire lock: ffff8880627caa58 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597 but task is already holding lock: ffff88807a67e208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:463 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x9d9/0x1240 fs/ext4/orphan.c:474 ext4_fill_super+0x98de/0xa110 fs/ext4/super.c:4974 mount_bdev+0x2c9/0x3f0 fs/super.c:1398 legacy_get_tree+0xeb/0x180 fs/fs_context.c:611 vfs_get_tree+0x88/0x270 fs/super.c:1528 do_new_mount+0x2ba/0xb40 fs/namespace.c:3005 do_mount fs/namespace.c:3348 [inline] __do_sys_mount fs/namespace.c:3556 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3533 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 dquot_commit+0x57/0x510 fs/quota/dquot.c:507 ext4_write_dquot+0x1fd/0x360 fs/ext4/super.c:6172 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf7/0x400 fs/quota/dquot.c:412 __dquot_alloc_space+0xdd8/0x1090 fs/quota/dquot.c:1750 dquot_alloc_space_nodirty include/linux/quotaops.h:297 [inline] dquot_alloc_space include/linux/quotaops.h:310 [inline] dquot_alloc_block include/linux/quotaops.h:334 [inline] ext4_mb_new_blocks+0x12d8/0x4d60 fs/ext4/mballoc.c:5742 ext4_ext_map_blocks+0x1b01/0x7630 fs/ext4/extents.c:4318 ext4_map_blocks+0xa66/0x1c70 fs/ext4/inode.c:672 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922 ext4_append+0x31f/0x5c0 fs/ext4/namei.c:83 ext4_add_entry+0xbcf/0x12b0 fs/ext4/namei.c:2509 ext4_rename fs/ext4/namei.c:3988 [inline] ext4_rename2+0x2835/0x4420 fs/ext4/namei.c:4270 vfs_rename+0xd32/0x10f0 fs/namei.c:4832 do_renameat2+0xe0f/0x1700 fs/namei.c:4985 __do_sys_rename fs/namei.c:5031 [inline] __se_sys_rename fs/namei.c:5029 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5029 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6566 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125 find_free_dqentry fs/quota/quota_tree.c:271 [inline] do_insert_tree+0xa2c/0x1c20 fs/quota/quota_tree.c:364 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:472 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 __ext4_new_inode+0x890/0x4430 fs/ext4/ialloc.c:993 ext4_create+0x275/0x550 fs/ext4/namei.c:2881 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_creat fs/open.c:1343 [inline] __se_sys_creat fs/open.c:1337 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&s->s_dquot.dqio_sem); lock(&dquot->dq_lock); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); *** DEADLOCK *** 4 locks held by syz.3.471/6531: #0: ffff88807a67e460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:377 #1: ffff8880624635c8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: inode_lock include/linux/fs.h:789 [inline] #1: ffff8880624635c8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: open_last_lookups fs/namei.c:3529 [inline] #1: ffff8880624635c8 (&type->i_mutex_dir_key#4){++++}-{3:3}, at: path_openat+0x824/0x2f20 fs/namei.c:3739 #2: ffff888073b96b28 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:460 #3: ffff88807a67e208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354 stack backtrace: CPU: 1 PID: 6531 Comm: syz.3.471 Not tainted 5.15.167-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 down_read+0x45/0x2e0 kernel/locking/rwsem.c:1498 ext4_map_blocks+0x391/0x1c70 fs/ext4/inode.c:597 ext4_getblk+0x19f/0x710 fs/ext4/inode.c:869 ext4_bread+0x2a/0x170 fs/ext4/inode.c:922 ext4_quota_write+0x21e/0x580 fs/ext4/super.c:6566 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x3a9/0x800 fs/quota/quota_tree.c:125 find_free_dqentry fs/quota/quota_tree.c:271 [inline] do_insert_tree+0xa2c/0x1c20 fs/quota/quota_tree.c:364 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 do_insert_tree+0x6d0/0x1c20 fs/quota/quota_tree.c:366 dq_insert_tree fs/quota/quota_tree.c:392 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:411 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:472 ext4_acquire_dquot+0x2eb/0x4a0 fs/ext4/super.c:6192 dqget+0x762/0xe90 fs/quota/dquot.c:986 __dquot_initialize+0x2d9/0xea0 fs/quota/dquot.c:1515 __ext4_new_inode+0x890/0x4430 fs/ext4/ialloc.c:993 ext4_create+0x275/0x550 fs/ext4/namei.c:2881 lookup_open fs/namei.c:3462 [inline] open_last_lookups fs/namei.c:3532 [inline] path_openat+0x130a/0x2f20 fs/namei.c:3739 do_filp_open+0x21c/0x460 fs/namei.c:3769 do_sys_openat2+0x13b/0x4f0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_creat fs/open.c:1343 [inline] __se_sys_creat fs/open.c:1337 [inline] __x64_sys_creat+0x11f/0x160 fs/open.c:1337 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fcf3a9caef9 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:00007fcf38e43038 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fcf3ab82f80 RCX: 00007fcf3a9caef9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007fcf3aa3db76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fcf3ab82f80 R15: 00007ffd3f635028 Quota error (device loop3): write_blk: dquota write failed Quota error (device loop3): qtree_write_dquot: Error -28 occurred while creating quota EXT4-fs error (device loop3): ext4_acquire_dquot:6196: comm syz.3.471: Failed to acquire dquot type 0