audit: type=1800 audit(1674966214.077:394): pid=11698 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14190 res=0 audit: type=1800 audit(1674966214.077:395): pid=11698 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14190 res=0 ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/11710 is trying to acquire lock: 0000000061d4d492 (&dquot->dq_lock){+.+.}, at: dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 but task is already holding lock: 000000008de74119 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&ei->i_data_sem/2){++++}: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 ext4_getblk+0xad/0x4f0 fs/ext4/inode.c:993 ext4_bread+0x7c/0x210 fs/ext4/inode.c:1043 ext4_quota_write+0x205/0x530 fs/ext4/super.c:6008 write_blk+0x10a/0x200 fs/quota/quota_tree.c:72 find_free_dqentry fs/quota/quota_tree.c:280 [inline] do_insert_tree+0x9c1/0x1150 fs/quota/quota_tree.c:337 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 do_insert_tree+0x85b/0x1150 fs/quota/quota_tree.c:339 dq_insert_tree fs/quota/quota_tree.c:365 [inline] qtree_write_dquot+0x1cb/0x570 fs/quota/quota_tree.c:384 v2_write_dquot+0x11c/0x250 fs/quota/quota_v2.c:359 dquot_acquire+0x25c/0x490 fs/quota/dquot.c:436 ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666 dqget+0x785/0xfc0 fs/quota/dquot.c:896 __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470 ext4_rmdir+0x11c/0xe20 fs/ext4/namei.c:3003 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 __do_sys_unlinkat fs/namei.c:4105 [inline] __se_sys_unlinkat fs/namei.c:4099 [inline] __x64_sys_unlinkat+0xdf/0x120 fs/namei.c:4099 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&s->s_dquot.dqio_sem){++++}: v2_read_dquot+0x49/0x120 fs/quota/quota_v2.c:333 dquot_acquire+0x121/0x490 fs/quota/dquot.c:428 ext4_acquire_dquot+0x1e7/0x2d0 fs/ext4/super.c:5666 dqget+0x785/0xfc0 fs/quota/dquot.c:896 __dquot_initialize+0x3bd/0xb70 fs/quota/dquot.c:1470 ext4_rmdir+0x11c/0xe20 fs/ext4/namei.c:3003 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 __do_sys_unlinkat fs/namei.c:4105 [inline] __se_sys_unlinkat fs/namei.c:4099 [inline] __x64_sys_unlinkat+0xdf/0x120 fs/namei.c:4099 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&dquot->dq_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650 ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701 mark_dquot_dirty fs/quota/dquot.c:341 [inline] mark_all_dquot_dirty fs/quota/dquot.c:379 [inline] __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702 dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline] dquot_alloc_space include/linux/quotaops.h:311 [inline] dquot_alloc_block include/linux/quotaops.h:335 [inline] ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 ext4_write_begin+0x52d/0x1610 fs/ext4/inode.c:1345 ext4_da_write_begin+0x737/0x10e0 fs/ext4/inode.c:3051 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x668/0x790 fs/read_write.c:681 do_iter_write+0x182/0x5d0 fs/read_write.c:960 vfs_iter_write+0x70/0xa0 fs/read_write.c:973 iter_file_splice_write+0x60d/0xbb0 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1025 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe 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-executor.5/11710: #0: 000000000d5f4565 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000000d5f4565 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 #1: 00000000ddaeb1c7 (&sb->s_type->i_mutex_key#10){++++}, at: inode_trylock include/linux/fs.h:768 [inline] #1: 00000000ddaeb1c7 (&sb->s_type->i_mutex_key#10){++++}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 #2: 000000008de74119 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 #3: 00000000f731cb8f (dquot_srcu){....}, at: i_dquot fs/quota/dquot.c:921 [inline] #3: 00000000f731cb8f (dquot_srcu){....}, at: __dquot_alloc_space+0x1ad/0x860 fs/quota/dquot.c:1662 stack backtrace: CPU: 1 PID: 11710 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 ext4_write_dquot+0x1e7/0x280 fs/ext4/super.c:5650 ext4_mark_dquot_dirty+0x111/0x1a0 fs/ext4/super.c:5701 mark_dquot_dirty fs/quota/dquot.c:341 [inline] mark_all_dquot_dirty fs/quota/dquot.c:379 [inline] __dquot_alloc_space+0x37e/0x860 fs/quota/dquot.c:1702 dquot_alloc_space_nodirty include/linux/quotaops.h:298 [inline] dquot_alloc_space include/linux/quotaops.h:311 [inline] dquot_alloc_block include/linux/quotaops.h:335 [inline] ext4_mb_new_blocks+0x58c/0x4370 fs/ext4/mballoc.c:4534 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 __block_write_begin_int+0x46c/0x17b0 fs/buffer.c:1978 ext4_write_begin+0x52d/0x1610 fs/ext4/inode.c:1345 ext4_da_write_begin+0x737/0x10e0 fs/ext4/inode.c:3051 generic_perform_write+0x1f8/0x4d0 mm/filemap.c:3170 __generic_file_write_iter+0x24b/0x610 mm/filemap.c:3295 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] do_iter_readv_writev+0x668/0x790 fs/read_write.c:681 do_iter_write+0x182/0x5d0 fs/read_write.c:960 vfs_iter_write+0x70/0xa0 fs/read_write.c:973 iter_file_splice_write+0x60d/0xbb0 fs/splice.c:750 do_splice_from fs/splice.c:852 [inline] direct_splice_actor+0x115/0x160 fs/splice.c:1025 splice_direct_to_actor+0x33f/0x8d0 fs/splice.c:980 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fef340f80c9 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:00007fef3266a168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007fef34217f80 RCX: 00007fef340f80c9 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000008 RBP: 00007fef34153ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0001000000201005 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9e03818f R14: 00007fef3266a300 R15: 0000000000022000 input: syz1 as /devices/virtual/input/input566 audit: type=1800 audit(1674966215.497:396): pid=11800 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="file0" dev="sda1" ino=14727 res=0 EXT4-fs (loop5): Unrecognized mount option "" or missing value input: syz1 as /devices/virtual/input/input567 input: syz1 as /devices/virtual/input/input568 audit: type=1800 audit(1674966216.367:397): pid=11855 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="file0" dev="sda1" ino=14766 res=0 input: syz1 as /devices/virtual/input/input569 EXT4-fs (loop5): Unrecognized mount option "" or missing value input: syz1 as /devices/virtual/input/input570 input: syz1 as /devices/virtual/input/input571 input: syz1 as /devices/virtual/input/input572 input: syz1 as /devices/virtual/input/input573 input: syz1 as /devices/virtual/input/input574 input: syz1 as /devices/virtual/input/input575 input: syz1 as /devices/virtual/input/input576 delete_channel: no stack delete_channel: no stack input: syz1 as /devices/virtual/input/input577 input: syz1 as /devices/virtual/input/input578 input: syz1 as /devices/virtual/input/input579 input: syz1 as /devices/virtual/input/input580 input: syz1 as /devices/virtual/input/input581 input: syz1 as /devices/virtual/input/input582 input: syz1 as /devices/virtual/input/input583 input: syz1 as /devices/virtual/input/input584 netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 148 bytes leftover after parsing attributes in process `syz-executor.1'. input: syz1 as /devices/virtual/input/input585 netlink: 164 bytes leftover after parsing attributes in process `syz-executor.5'. input: syz1 as /devices/virtual/input/input586 input: syz1 as /devices/virtual/input/input587 input: syz1 as /devices/virtual/input/input588 input: syz1 as /devices/virtual/input/input589 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. input: syz1 as /devices/virtual/input/input590 input: syz1 as /devices/virtual/input/input591 netlink: 52 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 16 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 148 bytes leftover after parsing attributes in process `syz-executor.1'. input: syz1 as /devices/virtual/input/input592 input: syz1 as /devices/virtual/input/input593 input: syz1 as /devices/virtual/input/input594 input: syz1 as /devices/virtual/input/input595 input: syz1 as /devices/virtual/input/input596 input: syz1 as /devices/virtual/input/input597 input: syz1 as /devices/virtual/input/input598 input: syz1 as /devices/virtual/input/input599 input: syz1 as /devices/virtual/input/input600 can: request_module (can-proto-0) failed. input: syz1 as /devices/virtual/input/input601 netlink: 8 bytes leftover after parsing attributes in process `syz-executor.2'. input: syz1 as /devices/virtual/input/input602 input: syz1 as /devices/virtual/input/input603 input: syz1 as /devices/virtual/input/input604 input: syz1 as /devices/virtual/input/input605 base_sock_release(00000000135660d1) sk=00000000b8046c0c input: syz1 as /devices/virtual/input/input606 input: syz1 as /devices/virtual/input/input607 input: syz1 as /devices/virtual/input/input608 input: syz1 as /devices/virtual/input/input609 x_tables: duplicate underflow at hook 2 input: syz1 as /devices/virtual/input/input610 input: syz1 as /devices/virtual/input/input611 input: syz1 as /devices/virtual/input/input612