netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/13151 is trying to acquire lock: 00000000b23a338e (&dquot->dq_lock){+.+.}, at: dquot_commit+0x4d/0x400 fs/quota/dquot.c:469 but task is already holding lock: 000000002c9b5006 (&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+0x33e/0x1a50 fs/ext4/inode.c:578 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 get_free_dqblk+0xff/0x2d0 fs/quota/quota_tree.c:101 do_insert_tree+0x79c/0x1150 fs/quota/quota_tree.c:308 do_insert_tree+0xf5c/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_xattr_set+0xbd/0x2a0 fs/ext4/xattr.c:2499 __vfs_setxattr+0x10e/0x170 fs/xattr.c:149 __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180 __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238 vfs_setxattr+0xe5/0x270 fs/xattr.c:255 setxattr+0x23d/0x330 fs/xattr.c:520 path_setxattr+0x170/0x190 fs/xattr.c:539 __do_sys_setxattr fs/xattr.c:554 [inline] __se_sys_setxattr fs/xattr.c:550 [inline] __x64_sys_setxattr+0xc0/0x160 fs/xattr.c:550 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_mkdir+0xd7/0xe10 fs/ext4/namei.c:2689 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819 do_mkdirat+0x262/0x2d0 fs/namei.c:3842 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_alloc_branch fs/ext4/indirect.c:335 [inline] ext4_ind_map_blocks+0x1590/0x2430 fs/ext4/indirect.c:619 ext4_map_blocks+0xda9/0x1a50 fs/ext4/inode.c:659 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:871 ext4_dio_get_block+0x73/0xc0 fs/ext4/inode.c:888 get_more_blocks fs/direct-io.c:717 [inline] do_direct_IO fs/direct-io.c:1003 [inline] do_blockdev_direct_IO fs/direct-io.c:1333 [inline] __blockdev_direct_IO+0x424b/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 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 *** 5 locks held by syz-executor.4/13151: #0: 0000000016ac7b3b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 000000008d3a0fe9 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #1: 000000008d3a0fe9 (sb_writers#3){.+.+}, at: vfs_write+0x463/0x540 fs/read_write.c:548 #2: 000000004a722c93 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:768 [inline] #2: 000000004a722c93 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x21f/0xf20 fs/ext4/file.c:238 #3: 000000002c9b5006 (&ei->i_data_sem/2){++++}, at: ext4_map_blocks+0x740/0x1a50 fs/ext4/inode.c:650 #4: 0000000012abb34b (dquot_srcu){....}, at: i_dquot fs/quota/dquot.c:921 [inline] #4: 0000000012abb34b (dquot_srcu){....}, at: __dquot_alloc_space+0x1ad/0x860 fs/quota/dquot.c:1662 stack backtrace: CPU: 0 PID: 13151 Comm: syz-executor.4 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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_alloc_branch fs/ext4/indirect.c:335 [inline] ext4_ind_map_blocks+0x1590/0x2430 fs/ext4/indirect.c:619 ext4_map_blocks+0xda9/0x1a50 fs/ext4/inode.c:659 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:871 ext4_dio_get_block+0x73/0xc0 fs/ext4/inode.c:888 get_more_blocks fs/direct-io.c:717 [inline] do_direct_IO fs/direct-io.c:1003 [inline] do_blockdev_direct_IO fs/direct-io.c:1333 [inline] __blockdev_direct_IO+0x424b/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x2fe/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f4a9178a0f9 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:00007f4a8fcfc168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f4a918a9f80 RCX: 00007f4a9178a0f9 RDX: 000000000020b000 RSI: 0000000020000000 RDI: 0000000000000009 RBP: 00007f4a917e5ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc3bfa861f R14: 00007f4a8fcfc300 R15: 0000000000022000 EXT4-fs (loop0): Unrecognized mount option "" or missing value netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs warning (device loop2): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop2. netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 284 bytes leftover after parsing attributes in process `syz-executor.1'. EXT4-fs warning (device loop2): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop2. EXT4-fs (loop0): Unrecognized mount option "blkio.bfq.io_serviced" or missing value EXT4-fs (loop1): Unrecognized mount option "/dev/full" or missing value EXT4-fs (loop1): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option " " or missing value EXT4-fs (loop3): Unrecognized mount option " " or missing value EXT4-fs (loop0): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs warning (device loop5): ext4_multi_mount_protect:386: Unable to create kmmpd thread for loop5. EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop0): Unrecognized mount option "" or missing value EXT4-fs (loop5): Unrecognized mount option "./file0" or missing value EXT4-fs (loop3): Unrecognized mount option "" or missing value EXT4-fs (loop0): Unrecognized mount option "" or missing value EXT4-fs (loop1): couldn't mount as ext3 due to feature incompatibilities