loop0: detected capacity change from 0 to 512 EXT4-fs (loop0): orphan cleanup on readonly fs ====================================================== WARNING: possible circular locking dependency detected 6.2.0-next-20230303-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor400/5208 is trying to acquire lock: ffff88807771b068 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_commit+0x51/0x570 fs/quota/dquot.c:479 but task is already holding lock: ffff8880751c52c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0xfce/0x1620 fs/ext4/inode.c:4337 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}-{3:3}: down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 ext4_getblk+0x61f/0x850 fs/ext4/inode.c:863 ext4_bread+0x2e/0x190 fs/ext4/inode.c:919 ext4_quota_write+0x218/0x620 fs/ext4/super.c:7101 write_blk+0x12e/0x220 fs/quota/quota_tree.c:64 get_free_dqblk+0x104/0x2f0 fs/quota/quota_tree.c:130 find_free_dqentry fs/quota/quota_tree.c:276 [inline] do_insert_tree+0xa52/0x12d0 fs/quota/quota_tree.c:373 do_insert_tree+0x696/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x696/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x696/0x12d0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6736 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0xa707/0xadf0 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1294 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4d/0x120 fs/quota/quota_v2.c:332 dquot_acquire+0x1b3/0x6c0 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6736 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0xa707/0xadf0 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1294 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&dquot->dq_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire.part.0+0x11a/0x370 kernel/locking/lockdep.c:5669 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 dquot_commit+0x51/0x570 fs/quota/dquot.c:479 ext4_write_dquot+0x25f/0x330 fs/ext4/super.c:6720 ext4_mark_dquot_dirty fs/ext4/super.c:6768 [inline] ext4_mark_dquot_dirty+0x115/0x1b0 fs/ext4/super.c:6762 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_free_space+0x773/0xaf0 fs/quota/dquot.c:1907 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:6044 [inline] ext4_free_blocks+0x11e0/0x2560 fs/ext4/mballoc.c:6173 ext4_remove_blocks fs/ext4/extents.c:2545 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2710 [inline] ext4_ext_remove_space+0x208e/0x4760 fs/ext4/extents.c:2958 ext4_ext_truncate+0x34b/0x400 fs/ext4/extents.c:4416 ext4_truncate+0x1033/0x1620 fs/ext4/inode.c:4342 ext4_process_orphan+0x158/0x410 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0xa707/0xadf0 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1294 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &dquot->dq_lock --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&dquot->dq_lock); *** DEADLOCK *** 4 locks held by syz-executor400/5208: #0: ffff888076e280e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 fs/super.c:228 #1: ffff8880751c5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff8880751c5440 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_process_orphan+0x109/0x410 fs/ext4/orphan.c:337 #2: ffff8880751c52c8 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_truncate+0xfce/0x1620 fs/ext4/inode.c:4337 #3: ffffffff8c991488 (dquot_srcu){....}-{0:0}, at: i_dquot fs/quota/dquot.c:939 [inline] #3: ffffffff8c991488 (dquot_srcu){....}-{0:0}, at: __dquot_free_space+0x1a8/0xaf0 fs/quota/dquot.c:1880 stack backtrace: CPU: 0 PID: 5208 Comm: syz-executor400 Not tainted 6.2.0-next-20230303-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 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 kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire.part.0+0x11a/0x370 kernel/locking/lockdep.c:5669 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 dquot_commit+0x51/0x570 fs/quota/dquot.c:479 ext4_write_dquot+0x25f/0x330 fs/ext4/super.c:6720 ext4_mark_dquot_dirty fs/ext4/super.c:6768 [inline] ext4_mark_dquot_dirty+0x115/0x1b0 fs/ext4/super.c:6762 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_free_space+0x773/0xaf0 fs/quota/dquot.c:1907 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:6044 [inline] ext4_free_blocks+0x11e0/0x2560 fs/ext4/mballoc.c:6173 ext4_remove_blocks fs/ext4/extents.c:2545 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2710 [inline] ext4_ext_remove_space+0x208e/0x4760 fs/ext4/extents.c:2958 ext4_ext_truncate+0x34b/0x400 fs/ext4/extents.c:4416 ext4_truncate+0x1033/0x1620 fs/ext4/inode.c:4342 ext4_process_orphan+0x158/0x410 fs/ext4/orphan.c:339 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0xa707/0xadf0 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1294 vfs_get_tree+0x8d/0x350 fs/super.c:1501 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __x64_sys_mount+0x283/0x300 fs/namespace.c:3571 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fbeac3d1cfa Code: 48 c7 c2 c0 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 a8 00 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffe3a2ed48 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00005555565572c0 RCX: 00007fbeac3d1cfa RDX: 0000000020000040 RSI: 0000000020000500 RDI: 00007fffe3a2ed90 RBP: 0000000000000000 R08: 00007fffe3a2edd0 R09: 00000000000004b4 R10: 0000000000000047 R11: 0000000000000202 R12: 0000000000000004 R13: 00007fffe3a2edd0 R14: 0000000000000003 R15: 00007fffe3a2ed90 EXT4-fs (loop0): 1 truncate cleaned up