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SubjectINFO: task hung in genl_rcv_msg
From
Hello,

syzbot found the following crash on:

HEAD commit: bab5c80b2110 Merge tag 'armsoc-fixes-4.19' of git://git.ke..
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=15462c41400000
kernel config: https://syzkaller.appspot.com/x/.config?x=88e9a8a39dc0be2d
dashboard link: https://syzkaller.appspot.com/bug?extid=c3b90a95b2d6bd4f29b1
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=135e41a5400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+c3b90a95b2d6bd4f29b1@syzkaller.appspotmail.com

IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
8021q: adding VLAN 0 to HW filter on device team0
INFO: task syz-executor0:6925 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #140
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0 D24952 6925 5376 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x13a/0x168 net/netlink/genetlink.c:624
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007f805f83dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f805f83e6d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff
INFO: task syz-executor5:6923 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #140
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5 D24952 6923 5384 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x13a/0x168 net/netlink/genetlink.c:624
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007f00193a4c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f00193a56d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff
INFO: task syz-executor1:6930 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #140
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1 D24952 6930 5377 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x13a/0x168 net/netlink/genetlink.c:624
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007fc5ec984c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc5ec9856d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff
INFO: task syz-executor2:6940 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #140
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D24952 6940 5382 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x13a/0x168 net/netlink/genetlink.c:624
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007f988ec35c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f988ec366d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff
INFO: task syz-executor3:6942 blocked for more than 140 seconds.
Not tainted 4.19.0-rc7+ #140
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3 D23080 6942 5380 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2825 [inline]
__schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
schedule+0xfe/0x460 kernel/sched/core.c:3517
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3575
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0xbe7/0x1700 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
genl_lock net/netlink/genetlink.c:33 [inline]
genl_rcv_msg+0x13a/0x168 net/netlink/genetlink.c:624
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: Bad RIP value.
RSP: 002b:00007f8ef4a35c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000004
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f8ef4a366d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff

Showing all locks held in the system:
1 lock held by khungtaskd/982:
#0: 000000000bcea75c (rcu_read_lock){....}, at:
debug_show_all_locks+0xd0/0x424 kernel/locking/lockdep.c:4435
1 lock held by rsyslogd/5240:
#0: 00000000baacc0ba (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200
fs/file.c:766
2 locks held by getty/5329:
#0: 00000000da399000 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000078f6766 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5330:
#0: 000000006658d2ab (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000a4e55645 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5331:
#0: 00000000f3b48bf4 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000e44b615e (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5332:
#0: 00000000005368f9 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000717606d2 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5333:
#0: 000000008f6095e9 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000cbfa8653 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5334:
#0: 00000000a7e4496b (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 00000000e3981645 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/5335:
#0: 000000009ff3ef1e (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:353
#1: 000000004c38513e (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
4 locks held by syz-executor4/6919:
2 locks held by syz-executor0/6925:
#0: 00000000455a9b7b (cb_lock){++++}, at: genl_rcv+0x19/0x40
net/netlink/genetlink.c:636
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_lock
net/netlink/genetlink.c:33 [inline]
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_rcv_msg+0x13a/0x168
net/netlink/genetlink.c:624
2 locks held by syz-executor5/6923:
#0: 00000000455a9b7b (cb_lock){++++}, at: genl_rcv+0x19/0x40
net/netlink/genetlink.c:636
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_lock
net/netlink/genetlink.c:33 [inline]
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_rcv_msg+0x13a/0x168
net/netlink/genetlink.c:624
2 locks held by syz-executor1/6930:
#0: 00000000455a9b7b (cb_lock){++++}, at: genl_rcv+0x19/0x40
net/netlink/genetlink.c:636
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_lock
net/netlink/genetlink.c:33 [inline]
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_rcv_msg+0x13a/0x168
net/netlink/genetlink.c:624
2 locks held by syz-executor2/6940:
#0: 00000000455a9b7b (cb_lock){++++}, at: genl_rcv+0x19/0x40
net/netlink/genetlink.c:636
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_lock
net/netlink/genetlink.c:33 [inline]
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_rcv_msg+0x13a/0x168
net/netlink/genetlink.c:624
2 locks held by syz-executor3/6942:
#0: 00000000455a9b7b (cb_lock){++++}, at: genl_rcv+0x19/0x40
net/netlink/genetlink.c:636
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_lock
net/netlink/genetlink.c:33 [inline]
#1: 00000000f78598ee (genl_mutex){+.+.}, at: genl_rcv_msg+0x13a/0x168
net/netlink/genetlink.c:624

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

NMI backtrace for cpu 1
CPU: 1 PID: 982 Comm: khungtaskd Not tainted 4.19.0-rc7+ #140
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+0x1c4/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1b3/0x1ed lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
trigger_all_cpu_backtrace include/linux/nmi.h:144 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
watchdog+0xb3e/0x1050 kernel/hung_task.c:265
kthread+0x35a/0x420 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.662
msecs
NMI backtrace for cpu 0
CPU: 0 PID: 6919 Comm: syz-executor4 Not tainted 4.19.0-rc7+ #140
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__rhashtable_lookup include/linux/rhashtable.h:481 [inline]
RIP: 0010:rhashtable_lookup include/linux/rhashtable.h:516 [inline]
RIP: 0010:rhashtable_lookup_fast include/linux/rhashtable.h:542 [inline]
RIP: 0010:tipc_sk_lookup+0x99e/0xff0 net/tipc/socket.c:2698
Code: 85 2b 06 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 03 4b
06 fa 0f b6 05 9c 06 76 02 31 ff 89 c6 88 85 d0 fd ff ff <e8> bd 4b 06 fa
0f b6 85 d0 fd ff ff 84 c0 0f 85 74 fc ff ff e8 d9
RSP: 0018:ffff8801cecde8c8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff8801cecdeb18 RCX: ffffffff87788ad8
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8801cecdeb40 R08: ffff8801ce884040 R09: 1ffffffff1273965
R10: ffffed003b5c4732 R11: ffff8801dae23993 R12: ffff8801c89b2a00
R13: dffffc0000000000 R14: 0000000000000092 R15: 0000000000000001
FS: 00007fc2cfef9700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 00000001bc63a000 CR4: 00000000001406f0
Call Trace:
tipc_nl_publ_dump+0x22d/0xf9c net/tipc/socket.c:3502
__tipc_nl_compat_dumpit.isra.11+0x25d/0xb50 net/tipc/netlink_compat.c:196
tipc_nl_compat_publ_dump net/tipc/netlink_compat.c:925 [inline]
tipc_nl_compat_sk_dump+0x88e/0xc50 net/tipc/netlink_compat.c:973
__tipc_nl_compat_dumpit.isra.11+0x389/0xb50 net/tipc/netlink_compat.c:205
tipc_nl_compat_dumpit+0x1f4/0x440 net/tipc/netlink_compat.c:270
tipc_nl_compat_handle net/tipc/netlink_compat.c:1147 [inline]
tipc_nl_compat_recv+0x12b3/0x19a0 net/tipc/netlink_compat.c:1210
genl_family_rcv_msg+0x8a9/0x1140 net/netlink/genetlink.c:601
genl_rcv_msg+0xc6/0x168 net/netlink/genetlink.c:626
netlink_rcv_skb+0x172/0x440 net/netlink/af_netlink.c:2454
genl_rcv+0x28/0x40 net/netlink/genetlink.c:637
netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline]
netlink_unicast+0x5a5/0x760 net/netlink/af_netlink.c:1343
netlink_sendmsg+0xa18/0xfc0 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xd5/0x120 net/socket.c:631
___sys_sendmsg+0x7fd/0x930 net/socket.c:2116
__sys_sendmsg+0x11d/0x280 net/socket.c:2154
__do_sys_sendmsg net/socket.c:2163 [inline]
__se_sys_sendmsg net/socket.c:2161 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2161
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457569
Code: fd b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc2cfef8c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457569
RDX: 0000000000000000 RSI: 0000000020000100 RDI: 0000000000000006
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc2cfef96d4
R13: 00000000004c387d R14: 00000000004d56d0 R15: 00000000ffffffff


---
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 syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

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