INFO: task hung in dev_deactivate_many

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: b11964ad ANDROID: cuttlefish: enable CONFIG_INET_UDP_DIAG=y
git tree: android-4.14
console output: https://syzkaller.appspot.com/x/log.txt?x=12729a1b200000
kernel config: https://syzkaller.appspot.com/x/.config?x=322dd7397c84f390
dashboard link: https://syzkaller.appspot.com/bug?extid=9d66da9b2acf11edf3f4
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+9d66da...@syzkaller.appspotmail.com

ip6_tunnel: l0 xmit: Local address not yet configured!
INFO: task kworker/u4:23:7567 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:23 D26352 7567 2 0x80000000
Workqueue: netns cleanup_net
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
_synchronize_rcu_expedited+0x5ab/0x850 kernel/rcu/tree_exp.h:615
synchronize_net+0x2b/0x40 net/core/dev.c:8217
dev_deactivate_many+0x3cf/0x980 net/sched/sch_generic.c:931
__dev_close_many+0x10a/0x260 net/core/dev.c:1441
INFO: task syz-executor.1:8512 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29712 8512 1846 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
dev_ioctl+0x285/0xca0 net/core/dev_ioctl.c:421
sock_do_ioctl+0x92/0xb0 net/socket.c:980
sock_ioctl+0x253/0x440 net/socket.c:1070
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.1:8562 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D30064 8562 1846 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
__tun_chr_ioctl+0x125/0x31f0 drivers/net/tun.c:2309
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.1:8569 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.1 D29952 8569 1846 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
dev_ioctl+0x285/0xca0 net/core/dev_ioctl.c:421
sock_do_ioctl+0x92/0xb0 net/socket.c:980
sock_ioctl+0x253/0x440 net/socket.c:1070
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.4:8518 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29024 8518 1854 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
devinet_ioctl+0x17f/0x15c0 net/ipv4/devinet.c:1006
INFO: task syz-executor.4:8528 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29776 8528 1854 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
do_ip_setsockopt.isra.0+0x106/0x27c0 net/ipv4/ip_sockglue.c:645
ip_setsockopt+0x36/0x90 net/ipv4/ip_sockglue.c:1248
tcp_setsockopt net/ipv4/tcp.c:2805 [inline]
tcp_setsockopt+0x81/0xc0 net/ipv4/tcp.c:2799
SYSC_setsockopt net/socket.c:1864 [inline]
SyS_setsockopt+0x12b/0x210 net/socket.c:1843
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.4:8533 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29024 8533 1854 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
devinet_ioctl+0x17f/0x15c0 net/ipv4/devinet.c:1006
INFO: task syz-executor.4:8565 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4 D29776 8565 1854 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
do_ip_setsockopt.isra.0+0x106/0x27c0 net/ipv4/ip_sockglue.c:645
ip_setsockopt+0x36/0x90 net/ipv4/ip_sockglue.c:1248
tcp_setsockopt net/ipv4/tcp.c:2805 [inline]
tcp_setsockopt+0x81/0xc0 net/ipv4/tcp.c:2799
SYSC_setsockopt net/socket.c:1864 [inline]
SyS_setsockopt+0x12b/0x210 net/socket.c:1843
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.3:8560 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D27104 8560 1860 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
ipv6_route_ioctl+0x1ca/0x280 net/ipv6/route.c:2678
inet6_ioctl+0xff/0x1b0 net/ipv6/af_inet6.c:554
sock_do_ioctl+0x65/0xb0 net/socket.c:973
sock_ioctl+0x253/0x440 net/socket.c:1070
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289
INFO: task syz-executor.3:8579 blocked for more than 140 seconds.
Not tainted 4.14.105+ #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3 D30064 8579 1860 0x00000004
Call Trace:
schedule+0x92/0x1c0 kernel/sched/core.c:3492
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3550
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0x559/0x1430 kernel/locking/mutex.c:893
addrconf_add_ifaddr+0xe2/0x170 net/ipv6/addrconf.c:2966
inet6_ioctl+0x114/0x1b0 net/ipv6/af_inet6.c:557
sock_do_ioctl+0x65/0xb0 net/socket.c:973
sock_ioctl+0x253/0x440 net/socket.c:1070
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:500 [inline]
do_vfs_ioctl+0xabe/0x1040 fs/ioctl.c:684
SYSC_ioctl fs/ioctl.c:701 [inline]
SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692
do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289

Showing all locks held in the system:
1 lock held by khungtaskd/23:
#0: (tasklist_lock){.+.?}, at: [<ffffffffa3a00e0c>]
debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541
2 locks held by getty/1759:
#0: (&tty->ldisc_sem){++++}, at: [<ffffffffa4538782>]
tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:275
#1: (&ldata->atomic_read_lock){+.+.}, at: [<ffffffffa4533ba7>]
n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.0/3165:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.0/3189:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by udevd/3701:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
2 locks held by syz-executor.5/4353:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (sk_lock-AF_PACKET){+.+.}, at: [<ffffffffa4fd0319>] lock_sock
include/net/sock.h:1456 [inline]
#1: (sk_lock-AF_PACKET){+.+.}, at: [<ffffffffa4fd0319>]
packet_release+0x4c9/0xb80 net/packet/af_packet.c:3036
2 locks held by syz-executor.5/5598:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<ffffffffa3a48eb5>]
exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline]
#1: (rcu_preempt_state.exp_mutex){+.+.}, at: [<ffffffffa3a48eb5>]
_synchronize_rcu_expedited+0x375/0x850 kernel/rcu/tree_exp.h:596
1 lock held by syz-executor.0/5912:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
3 locks held by kworker/0:4/5967:
#0: ("%s"("ipv6_addrconf")){+.+.}, at: [<ffffffffa39287d5>]
process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085
#1: ((addr_chk_work).work){+.+.}, at: [<ffffffffa392880b>]
process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089
#2: (rtnl_mutex){+.+.}, at: [<ffffffffa4ebe26a>]
addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431
2 locks held by syz-executor.3/6126:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
#1: (&ep->mtx){+.+.}, at: [<ffffffffa3e3e5d9>] ep_free+0xd9/0x220
fs/eventpoll.c:859
2 locks held by syz-executor.3/7130:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (rtnl_mutex){+.+.}, at: [<ffffffffa4d55d5e>] raw_close+0xe/0x30
net/ipv4/raw.c:699
5 locks held by kworker/u4:23/7567:
#0: ("%s""netns"){+.+.}, at: [<ffffffffa39287d5>]
process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085
#1: (net_cleanup_work){+.+.}, at: [<ffffffffa392880b>]
process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089
#2: (net_mutex){+.+.}, at: [<ffffffffa4aeefd6>] cleanup_net+0x136/0x860
net/core/net_namespace.c:449
#3: (rtnl_mutex){+.+.}, at: [<ffffffffa4faf421>]
ip6_tnl_exit_net+0x71/0x550 net/ipv6/ip6_tunnel.c:2265
#4: (rcu_preempt_state.exp_mutex){+.+.}, at: [<ffffffffa3a48e47>]
exp_funnel_lock kernel/rcu/tree_exp.h:272 [inline]
#4: (rcu_preempt_state.exp_mutex){+.+.}, at: [<ffffffffa3a48e47>]
_synchronize_rcu_expedited+0x307/0x850 kernel/rcu/tree_exp.h:596
1 lock held by syz-executor.5/7794:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.0/12859:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.5/13291:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.5/13603:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.5/13613:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.5/15185:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.0/15434:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.3/16140:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
1 lock held by syz-executor.4/16427:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.3/18223:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
1 lock held by syz-executor.0/18235:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
2 locks held by kworker/u4:31/19722:
#0: ("events_unbound"){+.+.}, at: [<ffffffffa39287d5>]
process_one_work+0x6e5/0x14e0 kernel/workqueue.c:2085
#1: ((reaper_work).work){+.+.}, at: [<ffffffffa392880b>]
process_one_work+0x71b/0x14e0 kernel/workqueue.c:2089
2 locks held by syz-executor.4/20495:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (rtnl_mutex){+.+.}, at: [<ffffffffa4d55d5e>] raw_close+0xe/0x30
net/ipv4/raw.c:699
2 locks held by syz-executor.3/24503:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (sk_lock-AF_PACKET){+.+.}, at: [<ffffffffa4fd0319>] lock_sock
include/net/sock.h:1456 [inline]
#1: (sk_lock-AF_PACKET){+.+.}, at: [<ffffffffa4fd0319>]
packet_release+0x4c9/0xb80 net/packet/af_packet.c:3036
1 lock held by syz-executor.3/28445:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.0/28524:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
2 locks held by syz-executor.3/30012:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (rtnl_mutex){+.+.}, at: [<ffffffffa4d55d5e>] raw_close+0xe/0x30
net/ipv4/raw.c:699
1 lock held by udevd/740:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
1 lock held by syz-executor.1/931:
#0: (epmutex){+.+.}, at: [<ffffffffa3e3e56d>] ep_free+0x6d/0x220
fs/eventpoll.c:839
1 lock held by syz-executor.5/1601:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.2/1824:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.5/2121:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
1 lock held by syz-executor.1/5237:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
2 locks held by syz-executor.4/6734:
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
inode_lock include/linux/fs.h:715 [inline]
#0: (&sb->s_type->i_mutex_key#8){+.+.}, at: [<ffffffffa4a9dd26>]
__sock_release+0x86/0x250 net/socket.c:601
#1: (rtnl_mutex){+.+.}, at: [<ffffffffa4d55d5e>] raw_close+0xe/0x30
net/ipv4/raw.c:699
1 lock held by syz-executor.1/8512:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b7beb5>] dev_ioctl+0x285/0xca0
net/core/dev_ioctl.c:421
1 lock held by syz-executor.1/8562:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa46dd035>]
__tun_chr_ioctl+0x125/0x31f0 drivers/net/tun.c:2309
1 lock held by syz-executor.1/8569:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b7beb5>] dev_ioctl+0x285/0xca0
net/core/dev_ioctl.c:421
1 lock held by syz-executor.4/8518:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4d8721f>]
devinet_ioctl+0x17f/0x15c0 net/ipv4/devinet.c:1006
1 lock held by syz-executor.4/8528:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4cb8f56>]
do_ip_setsockopt.isra.0+0x106/0x27c0 net/ipv4/ip_sockglue.c:645
1 lock held by syz-executor.4/8533:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4d8721f>]
devinet_ioctl+0x17f/0x15c0 net/ipv4/devinet.c:1006
1 lock held by syz-executor.4/8565:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4cb8f56>]
do_ip_setsockopt.isra.0+0x106/0x27c0 net/ipv4/ip_sockglue.c:645
1 lock held by syz-executor.3/8560:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ee161a>]
ipv6_route_ioctl+0x1ca/0x280 net/ipv6/route.c:2678
1 lock held by syz-executor.3/8579:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ec1292>]
addrconf_add_ifaddr+0xe2/0x170 net/ipv6/addrconf.c:2966
1 lock held by syz-executor.3/8581:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ee161a>]
ipv6_route_ioctl+0x1ca/0x280 net/ipv6/route.c:2678
1 lock held by syz-executor.3/8586:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ec1292>]
addrconf_add_ifaddr+0xe2/0x170 net/ipv6/addrconf.c:2966
1 lock held by syz-executor.3/8587:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ee161a>]
ipv6_route_ioctl+0x1ca/0x280 net/ipv6/route.c:2678
1 lock held by syz-executor.3/8590:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4ee161a>]
ipv6_route_ioctl+0x1ca/0x280 net/ipv6/route.c:2678
1 lock held by syz-executor.3/8592:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa46dd035>]
__tun_chr_ioctl+0x125/0x31f0 drivers/net/tun.c:2309
1 lock held by syz-executor.5/8561:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b57ec0>] rtnl_lock
net/core/rtnetlink.c:72 [inline]
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b57ec0>]
rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280
1 lock held by syz-executor.5/8578:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b57ec0>] rtnl_lock
net/core/rtnetlink.c:72 [inline]
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b57ec0>]
rtnetlink_rcv_msg+0x330/0xb40 net/core/rtnetlink.c:4280
1 lock held by syz-executor.0/8583:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b7beb5>] dev_ioctl+0x285/0xca0
net/core/dev_ioctl.c:421
1 lock held by syz-executor.0/8585:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b7beb5>] dev_ioctl+0x285/0xca0
net/core/dev_ioctl.c:421
1 lock held by syz-executor.2/8596:
#0: (rtnl_mutex){+.+.}, at: [<ffffffffa4b7beb5>] dev_ioctl+0x285/0xca0
net/core/dev_ioctl.c:421

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

NMI backtrace for cpu 0
CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.105+ #29
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0xb9/0x10e lib/dump_stack.c:53
nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 18 Comm: kworker/1:0 Not tainted 4.14.105+ #29
Workqueue: events rtc_timer_do_work
task: ffff8881d66ac680 task.stack: ffff8881d66c8000
RIP: 0010:__lock_release kernel/locking/lockdep.c:3760 [inline]
RIP: 0010:lock_release+0x1de/0x730 kernel/locking/lockdep.c:4010
RSP: 0018:ffff8881d66cf9a8 EFLAGS: 00000002
RAX: 0000000000000004 RBX: 1ffff1103acd9f38 RCX: ffff8881d66cf9e0
RDX: 0000000000000004 RSI: 1ffffffff4b58485 RDI: ffff8881d66aceac
RBP: ffffffffa720a5a0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000246 R11: 0000000000000001 R12: ffff8881d1f36b88
R13: ffff8881d66ac680 R14: 0000000000000004 R15: ffff8881d66acea8
FS: 0000000000000000(0000) GS:ffff8881d7700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe9ffa3700 CR3: 0000000209226006 CR4: 00000000001606a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
Code: 89 e8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 4e 04 00 00 44 89 f0
0b 05 c0 bd 80 03 0f 84 49 03 00 00 48 8d 4c 24 38 44 89 f2 <4c> 89 e6 4c
89 ef e8 57 6a ff ff 48 85 c0 48 89 c1 0f 84 15 03


---
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Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.