EXT4-fs error (device loop5): ext4_lookup:1855: inode #15: comm syz-executor.5: casefold flag without casefold feature ====================================================== WARNING: possible circular locking dependency detected 6.1.63-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/4944 is trying to acquire lock: ffff88802b3c66d8 ( &ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644 but task is already holding lock: ffff888027de6208 (&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+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 down_read+0xad/0xa30 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4a/0x100 fs/quota/quota_v2.c:332 dquot_acquire+0x188/0x680 fs/quota/dquot.c:461 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6769 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x2d9/0xe10 fs/quota/dquot.c:1562 ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xb70/0x1400 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5533 [inline] ext4_fill_super+0x83ff/0x8b50 fs/ext4/super.c:5664 get_tree_bdev+0x3fe/0x620 fs/super.c:1355 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x132/0xd80 kernel/locking/mutex.c:747 dquot_commit+0x57/0x510 fs/quota/dquot.c:505 ext4_write_dquot+0x1e8/0x2b0 fs/ext4/super.c:6753 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty fs/quota/dquot.c:410 [inline] __dquot_free_space+0x99a/0xfe0 fs/quota/dquot.c:1977 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6106 [inline] ext4_free_blocks+0x1fb8/0x3020 fs/ext4/mballoc.c:6236 ext4_remove_blocks fs/ext4/extents.c:2545 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2711 [inline] ext4_ext_remove_space+0x22bb/0x4f30 fs/ext4/extents.c:2959 ext4_ext_truncate+0x201/0x360 fs/ext4/extents.c:4417 ext4_truncate+0xa1d/0x1290 fs/ext4/inode.c:4265 ext4_evict_inode+0xb68/0x1150 fs/ext4/inode.c:286 evict+0x2a4/0x620 fs/inode.c:664 ext4_orphan_cleanup+0xb70/0x1400 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5533 [inline] ext4_fill_super+0x83ff/0x8b50 fs/ext4/super.c:5664 get_tree_bdev+0x3fe/0x620 fs/super.c:1355 vfs_get_tree+0x88/0x270 fs/super.c:1562 do_new_mount+0x28b/0xae0 fs/namespace.c:3040 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount+0x2d5/0x3c0 fs/namespace.c:3568 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644 ext4_getblk+0x1eb/0x7c0 fs/ext4/inode.c:854 ext4_bread+0x2a/0x170 fs/ext4/inode.c:910 ext4_quota_write+0x21e/0x570 fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] find_free_dqentry fs/quota/quota_tree.c:312 [inline] do_insert_tree+0xe16/0x1ae0 fs/quota/quota_tree.c:373 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:420 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6769 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1562 ext4_file_open+0x2cf/0x710 fs/ext4/file.c:893 do_dentry_open+0x7f9/0x10f0 fs/open.c:882 do_open fs/namei.c:3558 [inline] path_openat+0x2644/0x2e60 fs/namei.c:3715 do_filp_open+0x230/0x480 fs/namei.c:3742 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd 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 *** 2 locks held by syz-executor.5/4944: #0: ffff888096f46ce8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x64/0x680 fs/quota/dquot.c:458 #1: ffff888027de6208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9b/0x190 fs/quota/quota_v2.c:354 stack backtrace: CPU: 0 PID: 4944 Comm: syz-executor.5 Not tainted 6.1.63-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 check_noncircular+0x2fa/0x3b0 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+0x1667/0x58e0 kernel/locking/lockdep.c:3824 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5048 lock_acquire+0x1f8/0x5a0 kernel/locking/lockdep.c:5661 down_write+0x36/0x60 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x963/0x1ca0 fs/ext4/inode.c:644 ext4_getblk+0x1eb/0x7c0 fs/ext4/inode.c:854 ext4_bread+0x2a/0x170 fs/ext4/inode.c:910 ext4_quota_write+0x21e/0x570 fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] find_free_dqentry fs/quota/quota_tree.c:312 [inline] do_insert_tree+0xe16/0x1ae0 fs/quota/quota_tree.c:373 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 do_insert_tree+0x72a/0x1ae0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b9/0x530 fs/quota/quota_tree.c:420 v2_write_dquot+0x11c/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x34d/0x680 fs/quota/dquot.c:470 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6769 dqget+0x74e/0xe30 fs/quota/dquot.c:984 __dquot_initialize+0x45e/0xe10 fs/quota/dquot.c:1562 ext4_file_open+0x2cf/0x710 fs/ext4/file.c:893 do_dentry_open+0x7f9/0x10f0 fs/open.c:882 do_open fs/namei.c:3558 [inline] path_openat+0x2644/0x2e60 fs/namei.c:3715 do_filp_open+0x230/0x480 fs/namei.c:3742 do_sys_openat2+0x13b/0x500 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1345 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fe6f0a7cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe6f17880c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fe6f0b9bf80 RCX: 00007fe6f0a7cae9 RDX: 0000000000103042 RSI: 00000000200000c0 RDI: ffffffffffffff9c RBP: 00007fe6f0ac847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fe6f0b9bf80 R15: 00007ffe9052d228