INFO: task hung in usbdev_open (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 3f8a27f9e27b Linux 4.19.211
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=10a0a9ff880000
kernel config: https://syzkaller.appspot.com/x/.config?x=9b9277b418617afe
dashboard link: https://syzkaller.appspot.com/bug?extid=4e98d38b11091ae4e826
compiler: gcc version 10.2.1 20210110 (Debian 10.2.1-6)

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/98c0bdb4abb3/disk-3f8a27f9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ea228ff02669/vmlinux-3f8a27f9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+4e98d3...@syzkaller.appspotmail.com

INFO: task syz-executor.0:10587 blocked for more than 140 seconds.
Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D27488 10587 8142 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1016 [inline]
__mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
device_lock include/linux/device.h:1174 [inline]
usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
chrdev_open+0x266/0x770 fs/char_dev.c:423
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff898235234
Code: Bad RIP value.
RSP: 002b:00007ff8967f4ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007ff898235234
RDX: 0000000000000001 RSI: 00007ff8967f4d40 RDI: 00000000ffffff9c
RBP: 00007ff8967f4d40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffd4472098f R14: 00007ff8967f5300 R15: 0000000000022000
INFO: task syz-executor.0:10592 blocked for more than 140 seconds.
Not tainted 4.19.211-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D29504 10592 8142 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2828 [inline]
__schedule+0x887/0x2040 kernel/sched/core.c:3517
schedule+0x8d/0x1b0 kernel/sched/core.c:3561
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619
__mutex_lock_common kernel/locking/mutex.c:1016 [inline]
__mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078
device_lock include/linux/device.h:1174 [inline]
usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
chrdev_open+0x266/0x770 fs/char_dev.c:423
do_dentry_open+0x4aa/0x1160 fs/open.c:796
do_last fs/namei.c:3421 [inline]
path_openat+0x793/0x2df0 fs/namei.c:3537
do_filp_open+0x18c/0x3f0 fs/namei.c:3567
do_sys_open+0x3b3/0x520 fs/open.c:1085
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7ff898235234
Code: Bad RIP value.
RSP: 002b:00007ff8967d3ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00007ff898235234
RDX: 0000000000000001 RSI: 00007ff8967d3d40 RDI: 00000000ffffff9c
RBP: 00007ff8967d3d40 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffd4472098f R14: 00007ff8967d4300 R15: 0000000000022000

Showing all locks held in the system:
netlink: 12 bytes leftover after parsing attributes in process `syz-executor.0'.
1 lock held by khungtaskd/1570:
#0: 0000000060ae2e77 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by in:imklog/7749:
#0: 00000000d66b209d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
2 locks held by kworker/1:0/8137:
#0: 000000003ce79348 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
#1: 00000000d3b6f076 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
4 locks held by kworker/u4:1/8192:
#0: 000000000640327e ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
#1: 000000002d301eff (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
#2: 000000008ac828e5 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:521
#3: 00000000ab009c80 (rtnl_mutex){+.+.}, at: netdev_run_todo+0x719/0xab0 net/core/dev.c:9005
3 locks held by kworker/0:2/5649:
#0: 000000000bdaafd4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
#1: 0000000054696af6 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
#2: 00000000ab009c80 (rtnl_mutex){+.+.}, at: addrconf_dad_work+0x9c/0x10a0 net/ipv6/addrconf.c:3989
5 locks held by kworker/0:21/5707:
#0: 000000003db6e0f6 ((wq_completion)"usb_hub_wq"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124
#1: 000000003ad4a2e0 ((work_completion)(&hub->events)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128
#2: 000000007acb51e1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
#2: 000000007acb51e1 (&dev->mutex){....}, at: hub_event+0x11e/0x44a0 drivers/usb/core/hub.c:5387
#3: 0000000036ed7d16 (&port_dev->status_lock){+.+.}, at: usb_lock_port drivers/usb/core/hub.c:2983 [inline]
#3: 0000000036ed7d16 (&port_dev->status_lock){+.+.}, at: hub_port_connect drivers/usb/core/hub.c:5069 [inline]
#3: 0000000036ed7d16 (&port_dev->status_lock){+.+.}, at: hub_port_connect_change drivers/usb/core/hub.c:5253 [inline]
#3: 0000000036ed7d16 (&port_dev->status_lock){+.+.}, at: port_event drivers/usb/core/hub.c:5361 [inline]
#3: 0000000036ed7d16 (&port_dev->status_lock){+.+.}, at: hub_event+0x1cb8/0x44a0 drivers/usb/core/hub.c:5441
#4: 00000000549e91aa (hcd->address0_mutex){+.+.}, at: hub_port_init+0x1b9/0x3120 drivers/usb/core/hub.c:4578
1 lock held by syz-executor.0/10587:
#0: 000000007acb51e1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
#0: 000000007acb51e1 (&dev->mutex){....}, at: usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
1 lock held by syz-executor.0/10592:
#0: 000000007acb51e1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
#0: 000000007acb51e1 (&dev->mutex){....}, at: usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
1 lock held by syz-executor.0/11040:
#0: 000000007acb51e1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
#0: 000000007acb51e1 (&dev->mutex){....}, at: usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
1 lock held by syz-executor.0/11042:
#0: 000000007acb51e1 (&dev->mutex){....}, at: device_lock include/linux/device.h:1174 [inline]
#0: 000000007acb51e1 (&dev->mutex){....}, at: usbdev_open+0x152/0x7f0 drivers/usb/core/devio.c:1007
2 locks held by syz-executor.1/12001:
#0: 000000008ac828e5 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x1d8/0x340 net/core/net_namespace.c:435
#1: 000000006a80351b (rcu_preempt_state.barrier_mutex){+.+.}, at: _rcu_barrier+0x59/0x3e0 kernel/rcu/tree.c:3430
2 locks held by syz-executor.1/12009:
#0: 000000008ac828e5 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x1d8/0x340 net/core/net_namespace.c:435
#1: 00000000ab009c80 (rtnl_mutex){+.+.}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1032
2 locks held by syz-executor.0/12062:
#0: 00000000ab009c80 (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
#0: 00000000ab009c80 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4779
#1: 000000009376959b (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline]
#1: 000000009376959b (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x4dc/0x6f0 kernel/rcu/tree_exp.h:667

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x991/0xe60 kernel/hung_task.c:287
kthread+0x33f/0x460 kernel/kthread.c:259
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 12009 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:lock_acquire+0x5b/0x3c0 kernel/locking/lockdep.c:3900
Code: 00 00 48 83 ec 18 48 89 fa 4c 89 0c 24 48 c1 ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bd 02 00 00 <8b> b3 84 08 00 00 85 f6 0f 85 88 01 00 00 48 c7 c0 80 82 f1 89 48
RSP: 0018:ffff8880454df8e8 EFLAGS: 00000246
RAX: 0000000000000007 RBX: ffff8880a57b6540 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8880a57b6dc4
RBP: ffffffff89f85fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 0000000000000000
FS: 00007f03fcd0b700(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0dd18e1008 CR3: 0000000038b92000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_acquire include/linux/rcupdate.h:242 [inline]
rcu_read_lock include/linux/rcupdate.h:627 [inline]
inet_twsk_purge+0x115/0x7c0 net/ipv4/inet_timewait_sock.c:267
ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156
setup_net+0x3d1/0x720 net/core/net_namespace.c:333
copy_net_ns+0x1f7/0x340 net/core/net_namespace.c:439
create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107
copy_namespaces+0x325/0x3c0 kernel/nsproxy.c:165
copy_process.part.0+0x3a59/0x8260 kernel/fork.c:1916
copy_process kernel/fork.c:1710 [inline]
_do_fork+0x22f/0xf30 kernel/fork.c:2219
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f03fe7ba0a9
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:00007f03fcd0b118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f03fe8da050 RCX: 00007f03fe7ba0a9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0800400
RBP: 00007f03fe815ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffc0cacb80f R14: 00007f03fcd0b300 R15: 0000000000022000


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