netlink: 'syz-executor.1': attribute type 1 has an invalid length. vhci_hcd: connection reset by peer vhci_hcd: stop threads vhci_hcd: release socket ====================================================== WARNING: possible circular locking dependency detected 4.19.195-syzkaller #0 Not tainted ------------------------------------------------------ vhci_hcd: disconnect device kworker/1:5/9480 is trying to acquire lock: 0000000095abffa1 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 0000000095abffa1 (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578 but task is already holding lock: 00000000497af88b ((delayed_fput_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 ((delayed_fput_work).work){+.+.}: worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #2 ((wq_completion)"events"){+.+.}: flush_scheduled_work include/linux/workqueue.h:599 [inline] tipc_exit_net+0x38/0x60 net/tipc/core.c:100 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 -> #1 (pernet_ops_rwsem){++++}: unregister_netdevice_notifier+0x7b/0x330 net/core/dev.c:1708 raw_release+0x58/0x820 net/can/raw.c:358 __sock_release+0xcd/0x2a0 net/socket.c:579 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sb->s_type->i_mutex_key#13){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] __sock_release+0x86/0x2a0 net/socket.c:578 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 delayed_fput+0x56/0x70 fs/file_table.c:304 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#13 --> (wq_completion)"events" --> (delayed_fput_work).work Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock((delayed_fput_work).work); lock((wq_completion)"events"); lock((delayed_fput_work).work); lock(&sb->s_type->i_mutex_key#13); *** DEADLOCK *** 2 locks held by kworker/1:5/9480: #0: 0000000007e82995 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000497af88b ((delayed_fput_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 stack backtrace: CPU: 1 PID: 9480 Comm: kworker/1:5 Not tainted 4.19.195-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events delayed_fput 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 down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] __sock_release+0x86/0x2a0 net/socket.c:578 sock_close+0x15/0x20 net/socket.c:1140 __fput+0x2ce/0x890 fs/file_table.c:278 delayed_fput+0x56/0x70 fs/file_table.c:304 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 IPVS: ftp: loaded support on port[0] = 21 bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state device bridge0 entered promiscuous mode XFS (loop4): Invalid superblock magic number netlink: 'syz-executor.4': attribute type 1 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 'syz-executor.4': attribute type 1 has an invalid length. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. device vlan0 entered promiscuous mode device batadv0 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 libceph: connect [d::]:4 error -101 libceph: mon0 [d::]:4 connect error audit: type=1804 audit(1624968567.094:150): pid=23657 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.0" name="/root/syzkaller-testdir402875236/syzkaller.Xtudbu/540/cgroup.controllers" dev="sda1" ino=14905 res=1 IPVS: ftp: loaded support on port[0] = 21 ceph: No mds server is up or the cluster is laggy EXT4-fs error (device loop3): ext4_ext_check_inode:498: inode #3: comm syz-executor.3: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 1(1) EXT4-fs error (device loop3): ext4_quota_enable:5838: comm syz-executor.3: Bad quota inode # 3 EXT4-fs warning (device loop3): ext4_enable_quotas:5875: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop3): mount failed EXT4-fs error (device loop3): ext4_ext_check_inode:498: inode #3: comm syz-executor.3: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 1(1) EXT4-fs error (device loop3): ext4_quota_enable:5838: comm syz-executor.3: Bad quota inode # 3 EXT4-fs warning (device loop3): ext4_enable_quotas:5875: Failed to enable quota tracking (type=0, err=-117). Please run e2fsck to fix. EXT4-fs (loop3): mount failed usb 13-1: enqueue for inactive port 0 usb 13-1: enqueue for inactive port 0 vhci_hcd: vhci_device speed not set ADFS-fs: unrecognised mount option "dont_appraise" or missing value IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 audit: type=1400 audit(1624968571.834:151): apparmor="DENIED" operation="change_hat" info="unconfined can not change_hat" error=-1 profile="unconfined" pid=24085 comm="syz-executor.4" AppArmor: change_hat: Invalid input '0x0000000‡00000004^/proc/thread-self/aQԅL}' audit: type=1400 audit(1624968571.844:152): apparmor="DENIED" operation="change_hat" info="unconfined can not change_hat" error=-1 profile="unconfined" pid=24085 comm="syz-executor.4" EXT4-fs (loop4): VFS: Can't find ext4 filesystem EXT4-fs (loop4): VFS: Can't find ext4 filesystem REISERFS warning (device loop2): sh-2021 reiserfs_fill_super: can not find reiserfs on loop2