INFO: task hung in addrconf_verify_work (2)
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syzbot
Jul 26, 2020, 4:09:17 PM7/26/20
to syzkaller...@googlegroups.com
Hello,
syzbot found the following issue on:
HEAD commit: 20b3a3df Linux 4.19.134
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=173870bc900000
kernel config: https://syzkaller.appspot.com/x/.config?x=7c76c572c403b9ac
dashboard link: https://syzkaller.appspot.com/bug?extid=c4ca228c10209e436eb6
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c4ca22...@syzkaller.appspotmail.com
bond101 (unregistering): Releasing backup interface bridge194
bond101 (unregistering): Releasing backup interface bridge193
bond101 (unregistering): Releasing backup interface bridge192
bond101 (unregistering): Released all slaves
bond100 (unregistering): Releasing backup interface bridge191
INFO: task kworker/0:0:5 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0 D26320 5 2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:1:23806 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1 D29400 23806 2 0x80000000
Workqueue: events switchdev_deferred_process_work
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:3:10221 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:3 D28992 10221 2 0x80000000
Workqueue: events linkwatch_event
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
linkwatch_event+0xb/0x60 net/core/link_watch.c:236
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task syz-executor.0:29168 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28648 29168 1 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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4774
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
__sys_sendto+0x21a/0x320 net/socket.c:1787
__do_sys_sendto net/socket.c:1799 [inline]
__se_sys_sendto net/socket.c:1795 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x416043
Code: Bad RIP value.
RSP: 002b:00007ffc13671d78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000ca3700 RCX: 0000000000416043
RDX: 0000000000000028 RSI: 0000000000ca3750 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc13671d80 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000ca3750 R15: 0000000000000003
Showing all locks held in the system:
bond100 (unregistering): Releasing backup interface bridge190
3 locks held by kworker/0:0/5:
#0: 00000000a4a253fd ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 000000002ee28908 ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475
1 lock held by khungtaskd/1082:
#0: 00000000c0b0035a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/6136:
#0: 00000000d660f8ad (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
2 locks held by agetty/6206:
#0: 000000000c9e8e4e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 0000000026354c44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154
4 locks held by kworker/u4:6/11448:
#0: 00000000e34cd9af ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 00000000860b7038 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000009857e87c (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:520
#3: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnl_lock_unregistering net/core/dev.c:9734 [inline]
#3: 000000007974e53b (rtnl_mutex){+.+.}, at: default_device_exit_batch+0xea/0x3c0 net/core/dev.c:9772
3 locks held by kworker/0:1/23806:
#0: 000000008dd09519 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 000000009b386a37 (deferred_process_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
3 locks held by kworker/0:3/10221:
#0: 000000008dd09519 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 00000000a968a6ff ((linkwatch_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:236
1 lock held by syz-executor.0/29168:
#0: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
#0: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4774
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1082 Comm: khungtaskd Not tainted 4.19.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb 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+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3682 Comm: systemd-journal Not tainted 4.19.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_is_watching+0x8f/0xc0 kernel/rcu/tree.c:1028
Code: b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 43 10 d1 e8 83 e0 01 65 ff 0d 78 81 a9 7e 74 07 48 83 c4 08 5b <5d> c3 e8 ab f2 a7 ff 48 83 c4 08 5b 5d c3 48 89 ef e8 2b 5f 47 00
RSP: 0018:ffff888094acfd60 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffffff891c6760 RCX: ffffffff81586c23
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae6239d0
RBP: ffff8880ae6239d0 R08: 0000000000000000 R09: ffffed1015cc473a
R10: ffff8880ae6239d3 R11: 000000001cebfd02 R12: ffff888089281e80
R13: 00000000007000c0 R14: ffff88812c39c1c0 R15: ffff88812c39c1c0
FS: 00007f8290b988c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f828dca7000 CR3: 0000000094aed000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_lock_sched_held+0xc6/0x1d0 kernel/rcu/update.c:113
trace_kmalloc include/trace/events/kmem.h:46 [inline]
__do_kmalloc mm/slab.c:3728 [inline]
__kmalloc_track_caller+0x389/0x3c0 mm/slab.c:3742
kmemdup+0x23/0x50 mm/util.c:118
kmemdup include/linux/string.h:446 [inline]
selinux_cred_prepare+0x44/0xa0 security/selinux/hooks.c:3982
security_prepare_creds+0x50/0xb0 security/security.c:1014
prepare_creds+0x32d/0x510 kernel/cred.c:282
do_faccessat+0x94/0x7a0 fs/open.c:359
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f828fe549c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe39fe3cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffe39fe6c10 RCX: 00007f828fe549c7
RDX: 00007f82908c5a00 RSI: 0000000000000000 RDI: 00005576c913d9a3
RBP: 00007ffe39fe3d30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffe39fe6c10 R15: 00007ffe39fe4220
---
This report 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 issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot found the following issue on:
HEAD commit: 20b3a3df Linux 4.19.134
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=173870bc900000
kernel config: https://syzkaller.appspot.com/x/.config?x=7c76c572c403b9ac
dashboard link: https://syzkaller.appspot.com/bug?extid=c4ca228c10209e436eb6
compiler: gcc (GCC) 10.1.0-syz 20200507
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c4ca22...@syzkaller.appspotmail.com
bond101 (unregistering): Releasing backup interface bridge194
bond101 (unregistering): Releasing backup interface bridge193
bond101 (unregistering): Releasing backup interface bridge192
bond101 (unregistering): Released all slaves
bond100 (unregistering): Releasing backup interface bridge191
INFO: task kworker/0:0:5 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:0 D26320 5 2 0x80000000
Workqueue: ipv6_addrconf addrconf_verify_work
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:1:23806 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:1 D29400 23806 2 0x80000000
Workqueue: events switchdev_deferred_process_work
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task kworker/0:3:10221 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:3 D28992 10221 2 0x80000000
Workqueue: events linkwatch_event
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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
linkwatch_event+0xb/0x60 net/core/link_watch.c:236
process_one_work+0x864/0x1570 kernel/workqueue.c:2155
worker_thread+0x64c/0x1130 kernel/workqueue.c:2298
kthread+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
INFO: task syz-executor.0:29168 blocked for more than 140 seconds.
Not tainted 4.19.134-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.0 D28648 29168 1 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:1002 [inline]
__mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4774
netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2455
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1909
sock_sendmsg_nosec net/socket.c:622 [inline]
sock_sendmsg+0xc3/0x120 net/socket.c:632
__sys_sendto+0x21a/0x320 net/socket.c:1787
__do_sys_sendto net/socket.c:1799 [inline]
__se_sys_sendto net/socket.c:1795 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:1795
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x416043
Code: Bad RIP value.
RSP: 002b:00007ffc13671d78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 0000000000ca3700 RCX: 0000000000416043
RDX: 0000000000000028 RSI: 0000000000ca3750 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffc13671d80 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000ca3750 R15: 0000000000000003
Showing all locks held in the system:
bond100 (unregistering): Releasing backup interface bridge190
3 locks held by kworker/0:0/5:
#0: 00000000a4a253fd ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 000000002ee28908 ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475
1 lock held by khungtaskd/1082:
#0: 00000000c0b0035a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440
1 lock held by in:imklog/6136:
#0: 00000000d660f8ad (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
2 locks held by agetty/6206:
#0: 000000000c9e8e4e (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
#1: 0000000026354c44 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154
4 locks held by kworker/u4:6/11448:
#0: 00000000e34cd9af ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 00000000860b7038 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000009857e87c (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:520
#3: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnl_lock_unregistering net/core/dev.c:9734 [inline]
#3: 000000007974e53b (rtnl_mutex){+.+.}, at: default_device_exit_batch+0xea/0x3c0 net/core/dev.c:9772
3 locks held by kworker/0:1/23806:
#0: 000000008dd09519 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 000000009b386a37 (deferred_process_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:150
3 locks held by kworker/0:3/10221:
#0: 000000008dd09519 ((wq_completion)"events"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126
#1: 00000000a968a6ff ((linkwatch_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130
#2: 000000007974e53b (rtnl_mutex){+.+.}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:236
1 lock held by syz-executor.0/29168:
#0: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnl_lock net/core/rtnetlink.c:77 [inline]
#0: 000000007974e53b (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x3fe/0xb80 net/core/rtnetlink.c:4774
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 1082 Comm: khungtaskd Not tainted 4.19.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1fc/0x2fe lib/dump_stack.c:118
nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1a6/0x1eb 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+0x30b/0x410 kernel/kthread.c:246
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 3682 Comm: systemd-journal Not tainted 4.19.134-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:rcu_is_watching+0x8f/0xc0 kernel/rcu/tree.c:1028
Code: b6 14 02 48 89 e8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 24 8b 43 10 d1 e8 83 e0 01 65 ff 0d 78 81 a9 7e 74 07 48 83 c4 08 5b <5d> c3 e8 ab f2 a7 ff 48 83 c4 08 5b 5d c3 48 89 ef e8 2b 5f 47 00
RSP: 0018:ffff888094acfd60 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffffff891c6760 RCX: ffffffff81586c23
RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880ae6239d0
RBP: ffff8880ae6239d0 R08: 0000000000000000 R09: ffffed1015cc473a
R10: ffff8880ae6239d3 R11: 000000001cebfd02 R12: ffff888089281e80
R13: 00000000007000c0 R14: ffff88812c39c1c0 R15: ffff88812c39c1c0
FS: 00007f8290b988c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f828dca7000 CR3: 0000000094aed000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_read_lock_sched_held+0xc6/0x1d0 kernel/rcu/update.c:113
trace_kmalloc include/trace/events/kmem.h:46 [inline]
__do_kmalloc mm/slab.c:3728 [inline]
__kmalloc_track_caller+0x389/0x3c0 mm/slab.c:3742
kmemdup+0x23/0x50 mm/util.c:118
kmemdup include/linux/string.h:446 [inline]
selinux_cred_prepare+0x44/0xa0 security/selinux/hooks.c:3982
security_prepare_creds+0x50/0xb0 security/security.c:1014
prepare_creds+0x32d/0x510 kernel/cred.c:282
do_faccessat+0x94/0x7a0 fs/open.c:359
do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f828fe549c7
Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48
RSP: 002b:00007ffe39fe3cf8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015
RAX: ffffffffffffffda RBX: 00007ffe39fe6c10 RCX: 00007f828fe549c7
RDX: 00007f82908c5a00 RSI: 0000000000000000 RDI: 00005576c913d9a3
RBP: 00007ffe39fe3d30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ffe39fe6c10 R15: 00007ffe39fe4220
---
This report is generated by a bot. It may contain errors.
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syzbot
Feb 21, 2021, 3:05:13 AM2/21/21
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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