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/0:0/5 is trying to acquire lock: 00000000ca8fa0d2 (&sb->s_type->i_mutex_key#13){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 00000000ca8fa0d2 (&sb->s_type->i_mutex_key#13){+.+.}, at: __sock_release+0x86/0x2a0 net/socket.c:578 but task is already holding lock: 000000002b4ca388 ((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 bcm_release+0x94/0x700 net/can/bcm.c:1525 __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 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xbf3/0x2be0 kernel/exit.c:870 do_group_exit+0x125/0x310 kernel/exit.c:967 get_signal+0x3f2/0x1f70 kernel/signal.c:2589 do_signal+0x8f/0x1670 arch/x86/kernel/signal.c:799 exit_to_usermode_loop+0x204/0x2a0 arch/x86/entry/common.c:163 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/0:0/5: #0: 00000000604d3ac6 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000002b4ca388 ((delayed_fput_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 stack backtrace: CPU: 0 PID: 5 Comm: kworker/0:0 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 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. vhci_hcd vhci_hcd.0: pdev(2) rhport(1) sockfd(5) vhci_hcd vhci_hcd.0: devid(0) speed(1) speed_str(low-speed) vhci_hcd: connection closed vhci_hcd vhci_hcd.0: Device attached vhci_hcd: stop threads vhci_hcd: release socket vhci_hcd: disconnect device ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy audit: type=1800 audit(1624935778.185:1153): pid=19406 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.4" name="bus" dev="sda1" ino=16084 res=0 libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. ceph: No mds server is up or the cluster is laggy xt_CT: netfilter: NOTRACK target is deprecated, use CT instead or upgrade iptables libceph: connect [d::]:6789 error -101 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. libceph: mon0 [d::]:6789 connect error netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. ceph: No mds server is up or the cluster is laggy netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. usb 13-1: enqueue for inactive port 0 usb 13-1: enqueue for inactive port 0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor.5'. vhci_hcd: vhci_device speed not set libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses ceph: No mds server is up or the cluster is laggy netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor.2'. libceph: connect [d::]:6789 error -101 bridge_slave_0: FDB only supports static addresses libceph: mon0 [d::]:6789 connect error bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses audit: type=1804 audit(1624935782.185:1154): pid=19781 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.5" name="/root/syzkaller-testdir181373722/syzkaller.6QqqLD/941/cgroup.controllers" dev="sda1" ino=16099 res=1 libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy vhci_hcd vhci_hcd.0: pdev(4) rhport(0) sockfd(7) vhci_hcd vhci_hcd.0: devid(0) speed(1) speed_str(low-speed) vhci_hcd vhci_hcd.0: Device attached bridge_slave_0: FDB only supports static addresses vhci_hcd: connection closed vhci_hcd: stop threads vhci_hcd: release socket libceph: connect [d::]:6789 error -101 vhci_hcd: disconnect device libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error hfs: creator requires a 4 character value hfs: unable to parse mount options ceph: No mds server is up or the cluster is laggy hfs: creator requires a 4 character value hfs: unable to parse mount options libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off. overlayfs: unrecognized mount option "smackfsfloor=hBhö»¬xù©}§]‹†*L" or missing value bridge_slave_0: FDB only supports static addresses ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses overlayfs: maximum fs stacking depth exceeded overlayfs: filesystem on './bus' not supported as upperdir libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy bridge_slave_0: FDB only supports static addresses bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy xt_CHECKSUM: CHECKSUM should be avoided. If really needed, restrict with "-p udp" and only use in OUTPUT x_tables: ip6_tables: rpfilter match: used from hooks FORWARD, but only valid from PREROUTING x_tables: ip6_tables: rpfilter match: used from hooks FORWARD, but only valid from PREROUTING bridge_slave_0: FDB only supports static addresses libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy EXT4-fs (loop5): mounted filesystem without journal. Opts: ,errors=continue libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error block nbd4: Attempted send on invalid socket print_req_error: I/O error, dev nbd4, sector 0 efs: cannot read volume header bridge_slave_0: FDB only supports static addresses ceph: No mds server is up or the cluster is laggy libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error ceph: No mds server is up or the cluster is laggy overlayfs: unrecognized mount option "fowner=00000000000000000000" or missing value overlayfs: unrecognized mount option "lowerdiY—¿ç.:fileIö8 žÍö¹" or missing value libceph: connect [d::]:6789 error -101 libceph: mon0 [d::]:6789 connect error