INFO: task hung in linkwatch_event
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syzbot
May 3, 2020, 4:09:14 AM5/3/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following crash on:
HEAD commit: 773e2b1c Linux 4.14.178
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14e15918100000
kernel config: https://syzkaller.appspot.com/x/.config?x=51a99e08e1400ec5
dashboard link: https://syzkaller.appspot.com/bug?extid=4d80691aa567739e7dc1
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4d8069...@syzkaller.appspotmail.com
INFO: task kworker/0:3:7348 blocked for more than 140 seconds.
Not tainted 4.14.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:3 D27152 7348 2 0x80000000
Workqueue: events linkwatch_event
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
linkwatch_event+0xa/0x50 net/core/link_watch.c:236
process_one_work+0x813/0x1540 kernel/workqueue.c:2116
worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task syz-executor.5:8681 blocked for more than 140 seconds.
Not tainted 4.14.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D26336 8681 6349 0x80000002
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
kobject_cleanup lib/kobject.c:633 [inline]
kobject_release lib/kobject.c:675 [inline]
kref_put include/linux/kref.h:70 [inline]
kobject_put+0x178/0x1f0 lib/kobject.c:692
net_rx_queue_update_kobjects+0x2df/0x3e0 net/core/net-sysfs.c:967
remove_queue_kobjects net/core/net-sysfs.c:1431 [inline]
netdev_unregister_kobject+0x138/0x1d0 net/core/net-sysfs.c:1570
rollback_registered_many+0x620/0xa70 net/core/dev.c:7230
rollback_registered+0xd6/0x180 net/core/dev.c:7248
unregister_netdevice_queue net/core/dev.c:8260 [inline]
unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8253
unregister_netdevice include/linux/netdevice.h:2442 [inline]
__tun_detach+0xa8d/0xcf0 drivers/net/tun.c:576
tun_detach drivers/net/tun.c:586 [inline]
tun_chr_close+0x41/0x60 drivers/net/tun.c:2671
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9f2/0x2b00 kernel/exit.c:858
do_group_exit+0x100/0x310 kernel/exit.c:955
get_signal+0x385/0x1ca0 kernel/signal.c:2423
do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x159/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007ffa20debcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000078c0e8 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c0e8
RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0ec
R13: 00007ffe28d04caf R14: 00007ffa20dec9c0 R15: 000000000078c0ec
Showing all locks held in the system:
1 lock held by khungtaskd/1015:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81465d33>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
3 locks held by kworker/1:2/2864:
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] work_static include/linux/workqueue.h:199 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
#1: ((addr_chk_work).work){+.+.}, at: [<ffffffff813b67f1>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091
#2: (rtnl_mutex){+.+.}, at: [<ffffffff8571f2ca>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4412
3 locks held by kworker/0:3/7348:
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] work_static include/linux/workqueue.h:199 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
#1: ((linkwatch_work).work){+.+.}, at: [<ffffffff813b67f1>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091
#2: (rtnl_mutex){+.+.}, at: [<ffffffff8503dd1a>] linkwatch_event+0xa/0x50 net/core/link_watch.c:236
2 locks held by syz-executor.5/8681:
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83da6624>] tun_detach drivers/net/tun.c:585 [inline]
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83da6624>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2671
#1: (uevent_sock_mutex){+.+.}, at: [<ffffffff863af844>] kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1015 Comm: khungtaskd Not tainted 4.14.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5e2/0xb80 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11527 Comm: syz-executor.1 Not tainted 4.14.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888054714680 task.stack: ffff88804ec30000
RIP: 0033:0x401c42
RSP: 002b:00007f65c53e93d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000416687
RDX: 00007f65c53e94c0 RSI: 0000000024a918f0 RDI: 00000000004c139a
RBP: 000000000078bf00 R08: 00007f65c53e9a70 R09: 000000000078bf00
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000bf1 R14: 00000000004ce15b R15: 00007f65c53ea6d4
FS: 00007f65c53ea700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000024a918f0 CR3: 00000000960c5000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following crash on:
HEAD commit: 773e2b1c Linux 4.14.178
git tree: linux-4.14.y
console output: https://syzkaller.appspot.com/x/log.txt?x=14e15918100000
kernel config: https://syzkaller.appspot.com/x/.config?x=51a99e08e1400ec5
dashboard link: https://syzkaller.appspot.com/bug?extid=4d80691aa567739e7dc1
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+4d8069...@syzkaller.appspotmail.com
INFO: task kworker/0:3:7348 blocked for more than 140 seconds.
Not tainted 4.14.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:3 D27152 7348 2 0x80000000
Workqueue: events linkwatch_event
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
linkwatch_event+0xa/0x50 net/core/link_watch.c:236
process_one_work+0x813/0x1540 kernel/workqueue.c:2116
worker_thread+0x5d1/0x1070 kernel/workqueue.c:2250
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: task syz-executor.5:8681 blocked for more than 140 seconds.
Not tainted 4.14.178-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.5 D26336 8681 6349 0x80000002
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3486
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x73c/0x1470 kernel/locking/mutex.c:893
kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
kobject_cleanup lib/kobject.c:633 [inline]
kobject_release lib/kobject.c:675 [inline]
kref_put include/linux/kref.h:70 [inline]
kobject_put+0x178/0x1f0 lib/kobject.c:692
net_rx_queue_update_kobjects+0x2df/0x3e0 net/core/net-sysfs.c:967
remove_queue_kobjects net/core/net-sysfs.c:1431 [inline]
netdev_unregister_kobject+0x138/0x1d0 net/core/net-sysfs.c:1570
rollback_registered_many+0x620/0xa70 net/core/dev.c:7230
rollback_registered+0xd6/0x180 net/core/dev.c:7248
unregister_netdevice_queue net/core/dev.c:8260 [inline]
unregister_netdevice_queue+0x1a1/0x220 net/core/dev.c:8253
unregister_netdevice include/linux/netdevice.h:2442 [inline]
__tun_detach+0xa8d/0xcf0 drivers/net/tun.c:576
tun_detach drivers/net/tun.c:586 [inline]
tun_chr_close+0x41/0x60 drivers/net/tun.c:2671
__fput+0x25f/0x790 fs/file_table.c:210
task_work_run+0x113/0x190 kernel/task_work.c:113
exit_task_work include/linux/task_work.h:22 [inline]
do_exit+0x9f2/0x2b00 kernel/exit.c:858
do_group_exit+0x100/0x310 kernel/exit.c:955
get_signal+0x385/0x1ca0 kernel/signal.c:2423
do_signal+0x7c/0x1690 arch/x86/kernel/signal.c:814
exit_to_usermode_loop+0x159/0x220 arch/x86/entry/common.c:160
prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline]
syscall_return_slowpath arch/x86/entry/common.c:270 [inline]
do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x45c829
RSP: 002b:00007ffa20debcf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000078c0e8 RCX: 000000000045c829
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000078c0e8
RBP: 000000000078c0e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0ec
R13: 00007ffe28d04caf R14: 00007ffa20dec9c0 R15: 000000000078c0ec
Showing all locks held in the system:
1 lock held by khungtaskd/1015:
#0: (tasklist_lock){.+.+}, at: [<ffffffff81465d33>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548
3 locks held by kworker/1:2/2864:
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] work_static include/linux/workqueue.h:199 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffff813b67b7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
#1: ((addr_chk_work).work){+.+.}, at: [<ffffffff813b67f1>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091
#2: (rtnl_mutex){+.+.}, at: [<ffffffff8571f2ca>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4412
3 locks held by kworker/0:3/7348:
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] work_static include/linux/workqueue.h:199 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_data kernel/workqueue.c:619 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ("events"){+.+.}, at: [<ffffffff813b67b7>] process_one_work+0x727/0x1540 kernel/workqueue.c:2087
#1: ((linkwatch_work).work){+.+.}, at: [<ffffffff813b67f1>] process_one_work+0x761/0x1540 kernel/workqueue.c:2091
#2: (rtnl_mutex){+.+.}, at: [<ffffffff8503dd1a>] linkwatch_event+0xa/0x50 net/core/link_watch.c:236
2 locks held by syz-executor.5/8681:
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83da6624>] tun_detach drivers/net/tun.c:585 [inline]
#0: (rtnl_mutex){+.+.}, at: [<ffffffff83da6624>] tun_chr_close+0x34/0x60 drivers/net/tun.c:2671
#1: (uevent_sock_mutex){+.+.}, at: [<ffffffff863af844>] kobject_uevent_env+0x5a4/0xc50 lib/kobject_uevent.c:459
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 1015 Comm: khungtaskd Not tainted 4.14.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline]
watchdog+0x5e2/0xb80 kernel/hung_task.c:274
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11527 Comm: syz-executor.1 Not tainted 4.14.178-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff888054714680 task.stack: ffff88804ec30000
RIP: 0033:0x401c42
RSP: 002b:00007f65c53e93d0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 000000000000000b RCX: 0000000000416687
RDX: 00007f65c53e94c0 RSI: 0000000024a918f0 RDI: 00000000004c139a
RBP: 000000000078bf00 R08: 00007f65c53e9a70 R09: 000000000078bf00
R10: 0000000000000000 R11: 0000000000000000 R12: 00000000ffffffff
R13: 0000000000000bf1 R14: 00000000004ce15b R15: 00007f65c53ea6d4
FS: 00007f65c53ea700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000024a918f0 CR3: 00000000960c5000 CR4: 00000000001426e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot
Jan 4, 2021, 8:42:10 PM1/4/21
to syzkaller...@googlegroups.com
Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.
Crashes did not happen for a while, no reproducer and no activity.
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