cgroup2: Unknown parameter 'blkio' ====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc6-syzkaller-00183-ga7a55e27ad72 #0 Not tainted ------------------------------------------------------ syz-executor.2/5831 is trying to acquire lock: ffff88802fefd2c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x38e/0x1cf0 fs/ext4/inode.c:574 but task is already holding lock: ffff888028f3e208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9f/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+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4e/0x110 fs/quota/quota_v2.c:332 dquot_acquire+0x18c/0x680 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6770 dqget+0x98f/0xdb0 fs/quota/dquot.c:914 __dquot_initialize+0x2dd/0xe20 fs/quota/dquot.c:1492 ext4_create+0xb5/0x550 fs/ext4/namei.c:2801 lookup_open fs/namei.c:3416 [inline] open_last_lookups fs/namei.c:3484 [inline] path_openat+0x13df/0x3170 fs/namei.c:3712 do_filp_open+0x234/0x490 fs/namei.c:3742 do_sys_openat2+0x13f/0x500 fs/open.c:1348 do_sys_open fs/open.c:1364 [inline] __do_sys_openat fs/open.c:1380 [inline] __se_sys_openat fs/open.c:1375 [inline] __x64_sys_openat+0x247/0x290 fs/open.c:1375 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&dquot->dq_lock){+.+.}-{3:3}: lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 __mutex_lock_common+0x1d8/0x2530 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x1b/0x20 kernel/locking/mutex.c:799 dquot_commit+0x5b/0x520 fs/quota/dquot.c:479 ext4_write_dquot+0x1f2/0x2c0 fs/ext4/super.c:6754 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x54c/0xf50 fs/quota/dquot.c:1722 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x111a/0x45f0 fs/ext4/mballoc.c:5571 ext4_ext_map_blocks+0x1973/0x7210 fs/ext4/extents.c:4286 ext4_map_blocks+0xa4c/0x1cf0 fs/ext4/inode.c:651 _ext4_get_block+0x238/0x6a0 fs/ext4/inode.c:807 ext4_block_write_begin+0x650/0x1400 fs/ext4/inode.c:1097 ext4_write_begin+0x626/0xee0 ext4_da_write_begin+0x42c/0x960 fs/ext4/inode.c:3057 generic_perform_write+0x300/0x5e0 mm/filemap.c:3926 ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:289 ext4_file_write_iter+0x1d6/0x1930 call_write_iter include/linux/fs.h:1851 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x7b2/0xbb0 fs/read_write.c:584 ksys_write+0x1a0/0x2c0 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x38e/0x1cf0 fs/ext4/inode.c:574 ext4_getblk+0x1ef/0x7c0 fs/ext4/inode.c:863 ext4_bread+0x2e/0x180 fs/ext4/inode.c:919 ext4_quota_write+0x222/0x580 fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x336/0x690 fs/quota/quota_tree.c:130 do_insert_tree+0x265/0x1a60 fs/quota/quota_tree.c:340 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3bd/0x530 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x351/0x680 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6770 dqget+0x98f/0xdb0 fs/quota/dquot.c:914 dquot_transfer+0x2c2/0x6d0 fs/quota/dquot.c:2103 ext4_setattr+0xaef/0x1bc0 fs/ext4/inode.c:5496 notify_change+0xc8b/0xf40 fs/attr.c:482 chown_common+0x500/0x850 fs/open.c:774 do_fchownat+0x16d/0x240 fs/open.c:805 __do_sys_lchown fs/open.c:830 [inline] __se_sys_lchown fs/open.c:828 [inline] __x64_sys_lchown+0x85/0x90 fs/open.c:828 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 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 *** 5 locks held by syz-executor.2/5831: #0: ffff888028f3e460 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:394 #1: ffff88803d565440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff88803d565440 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: chown_common+0x3e0/0x850 fs/open.c:764 #2: ffff88803d565108 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0xade/0x1bc0 fs/ext4/inode.c:5495 #3: ffff88803d6df5a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x68/0x680 fs/quota/dquot.c:432 #4: ffff888028f3e208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x9f/0x190 fs/quota/quota_v2.c:354 stack backtrace: CPU: 1 PID: 5831 Comm: syz-executor.2 Not tainted 6.3.0-rc6-syzkaller-00183-ga7a55e27ad72 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/30/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3832 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5056 lock_acquire+0x1e1/0x520 kernel/locking/lockdep.c:5669 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x38e/0x1cf0 fs/ext4/inode.c:574 ext4_getblk+0x1ef/0x7c0 fs/ext4/inode.c:863 ext4_bread+0x2e/0x180 fs/ext4/inode.c:919 ext4_quota_write+0x222/0x580 fs/ext4/super.c:7135 write_blk fs/quota/quota_tree.c:64 [inline] get_free_dqblk+0x336/0x690 fs/quota/quota_tree.c:130 do_insert_tree+0x265/0x1a60 fs/quota/quota_tree.c:340 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 do_insert_tree+0x70f/0x1a60 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3bd/0x530 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x190 fs/quota/quota_v2.c:358 dquot_acquire+0x351/0x680 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2e6/0x400 fs/ext4/super.c:6770 dqget+0x98f/0xdb0 fs/quota/dquot.c:914 dquot_transfer+0x2c2/0x6d0 fs/quota/dquot.c:2103 ext4_setattr+0xaef/0x1bc0 fs/ext4/inode.c:5496 notify_change+0xc8b/0xf40 fs/attr.c:482 chown_common+0x500/0x850 fs/open.c:774 do_fchownat+0x16d/0x240 fs/open.c:805 __do_sys_lchown fs/open.c:830 [inline] __se_sys_lchown fs/open.c:828 [inline] __x64_sys_lchown+0x85/0x90 fs/open.c:828 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f254e88c169 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f254f602168 EFLAGS: 00000246 ORIG_RAX: 000000000000005e RAX: ffffffffffffffda RBX: 00007f254e9ac050 RCX: 00007f254e88c169 RDX: 0000000000000000 RSI: 0000000000002180 RDI: 0000000020000180 RBP: 00007f254e8e7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffddf51eb5f R14: 00007f254f602300 R15: 0000000000022000