INFO: task hung in rtnetlink_rcv_msg

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 64c0133eb88a Merge tag 'armsoc-fixes' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14976800c00000
kernel config: https://syzkaller.appspot.com/x/.config?x=ee434566c893c7b1
dashboard link: https://syzkaller.appspot.com/bug?extid=8218a8a0ff60c19b8eae
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11c8a14cc00000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1189db74c00000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+8218a8...@syzkaller.appspotmail.com

INFO: task syz-executor725:8005 blocked for more than 140 seconds.
Not tainted 5.0.0-rc6+ #75
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor725 D27984 8005 7591 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:5127
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac037 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor725:8008 blocked for more than 140 seconds.
Not tainted 5.0.0-rc6+ #75
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor725 D27552 8008 7590 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:5127
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac03d R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor725:8009 blocked for more than 140 seconds.
Not tainted 5.0.0-rc6+ #75
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor725 D28008 8009 7595 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:5127
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac03d R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor725:8010 blocked for more than 140 seconds.
Not tainted 5.0.0-rc6+ #75
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor725 D28000 8010 7596 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:5127
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac03e R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000
INFO: task syz-executor725:8011 blocked for more than 140 seconds.
Not tainted 5.0.0-rc6+ #75
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor725 D28008 8011 7594 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2844 [inline]
__schedule+0x817/0x1cc0 kernel/sched/core.c:3485
schedule+0x92/0x180 kernel/sched/core.c:3529
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3587
__mutex_lock_common kernel/locking/mutex.c:1002 [inline]
__mutex_lock+0x726/0x1310 kernel/locking/mutex.c:1072
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
rtnl_lock net/core/rtnetlink.c:77 [inline]
rtnetlink_rcv_msg+0x40a/0xb00 net/core/rtnetlink.c:5127
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 <7a> fd ff 11 7a
fd ff 11 7a fd ff 11 7a fd ff 11 7a fd ff 11 7a fd
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac03b R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
3 locks held by kworker/1:1/22:
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
__write_once_size include/linux/compiler.h:220 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
atomic_long_set include/asm-generic/atomic-long.h:59 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
set_work_data kernel/workqueue.c:617 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline]
#0: 000000009b0b09b4 ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at:
process_one_work+0x87e/0x1790 kernel/workqueue.c:2144
#1: 00000000e8391065 ((addr_chk_work).work){+.+.}, at:
process_one_work+0x8b4/0x1790 kernel/workqueue.c:2148
#2: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock+0x17/0x20
net/core/rtnetlink.c:77
1 lock held by khungtaskd/1040:
#0: 00000000083344d4 (rcu_read_lock){....}, at:
debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4389
1 lock held by rsyslogd/7472:
#0: 000000007562dcc1 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110
fs/file.c:795
2 locks held by getty/7562:
#0: 000000000837ceb2 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000d91e6e17 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7563:
#0: 00000000243db696 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 000000000002034d (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7564:
#0: 00000000a59e483b (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 000000004032d53a (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7565:
#0: 0000000025343c97 (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000727bf19a (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7566:
#0: 000000003dac20af (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000fef38c44 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7567:
#0: 00000000da1bfc9c (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 00000000f82cf636 (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
2 locks held by getty/7568:
#0: 00000000a5d9fcdf (&tty->ldisc_sem){++++}, at:
ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
#1: 000000005ae165cb (&ldata->atomic_read_lock){+.+.}, at:
n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154
1 lock held by syz-executor725/8002:
1 lock held by syz-executor725/8005:
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock
net/core/rtnetlink.c:77 [inline]
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00
net/core/rtnetlink.c:5127
1 lock held by syz-executor725/8008:
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock
net/core/rtnetlink.c:77 [inline]
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00
net/core/rtnetlink.c:5127
1 lock held by syz-executor725/8009:
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock
net/core/rtnetlink.c:77 [inline]
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00
net/core/rtnetlink.c:5127
1 lock held by syz-executor725/8010:
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock
net/core/rtnetlink.c:77 [inline]
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00
net/core/rtnetlink.c:5127
1 lock held by syz-executor725/8011:
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnl_lock
net/core/rtnetlink.c:77 [inline]
#0: 00000000da1e0257 (rtnl_mutex){+.+.}, at: rtnetlink_rcv_msg+0x40a/0xb00
net/core/rtnetlink.c:5127

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

NMI backtrace for cpu 0
CPU: 0 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc6+ #75
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+0x172/0x1f0 lib/dump_stack.c:113
nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline]
watchdog+0x9df/0xee0 kernel/hung_task.c:287
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.415
msecs
NMI backtrace for cpu 1
CPU: 1 PID: 8002 Comm: syz-executor725 Not tainted 5.0.0-rc6+ #75
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:unwind_next_frame.part.0+0x1a8/0x9a0
arch/x86/kernel/unwind_frame.c:329
Code: 8b 6d 20 4c 89 ee 48 89 df 4c 89 95 60 ff ff ff 4c 89 9d 68 ff ff ff
4c 89 8d 70 ff ff ff e8 6f f7 ff ff 4c 8b 8d 70 ff ff ff <41> 89 c0 4c 8b
9d 68 ff ff ff b8 01 00 00 00 45 84 c0 4c 8b 95 60
RSP: 0018:ffff888096136e28 EFLAGS: 00000286
RAX: 0000000000000001 RBX: ffff888096136f00 RCX: 1ffff11012c26de8
RDX: dffffc0000000000 RSI: 1ffff11012c26d00 RDI: ffff888096136f48
RBP: ffff888096136ed8 R08: 0000000000000001 R09: ffff888096136f50
R10: ffff888096136f28 R11: ffff888096136f38 R12: 1ffff11012c26dca
R13: ffff888096137b70 R14: ffff888096137b40 R15: ffff888096137f58
FS: 00000000024b2880(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 000000009810b000 CR4: 00000000001406e0
Call Trace:
unwind_next_frame+0x3b/0x50 arch/x86/kernel/unwind_frame.c:287
__save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44
save_stack_trace+0x1a/0x20 arch/x86/kernel/stacktrace.c:60
save_stack+0x45/0xd0 mm/kasan/common.c:73
set_track mm/kasan/common.c:85 [inline]
__kasan_kmalloc mm/kasan/common.c:496 [inline]
__kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469
kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504
__do_kmalloc_node mm/slab.c:3673 [inline]
__kmalloc_node_track_caller+0x4e/0x70 mm/slab.c:3687
__kmalloc_reserve.isra.0+0x40/0xf0 net/core/skbuff.c:140
pskb_expand_head+0x14e/0xdd0 net/core/skbuff.c:1465
netlink_trim+0x215/0x270 net/netlink/af_netlink.c:1292
netlink_unicast+0xbf/0x720 net/netlink/af_netlink.c:1326
rtnetlink_send+0xf0/0x110 net/core/rtnetlink.c:721
tcf_add_notify net/sched/act_api.c:1325 [inline]
tcf_action_add+0x243/0x370 net/sched/act_api.c:1344
tc_ctl_action+0x3b6/0x4bd net/sched/act_api.c:1392
rtnetlink_rcv_msg+0x465/0xb00 net/core/rtnetlink.c:5130
netlink_rcv_skb+0x17a/0x460 net/netlink/af_netlink.c:2477
rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:5148
netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
netlink_unicast+0x536/0x720 net/netlink/af_netlink.c:1336
netlink_sendmsg+0x8ae/0xd70 net/netlink/af_netlink.c:1917
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg+0xdd/0x130 net/socket.c:631
___sys_sendmsg+0x806/0x930 net/socket.c:2114
__sys_sendmsg+0x105/0x1d0 net/socket.c:2152
__do_sys_sendmsg net/socket.c:2161 [inline]
__se_sys_sendmsg net/socket.c:2159 [inline]
__x64_sys_sendmsg+0x78/0xb0 net/socket.c:2159
do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4459f9
Code: e8 ac e8 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0b 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdc979ac28 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000004459f9
RDX: 00000000000000c4 RSI: 0000000020000300 RDI: 0000000000000003
RBP: 00000000000ac031 R08: 00000000004002c8 R09: 00000000004002c8
R10: 00000000200015a6 R11: 0000000000000246 R12: 0000000000406890
R13: 0000000000406920 R14: 0000000000000000 R15: 0000000000000000


---
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:
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syzbot can test patches for this bug, for details see:
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[Jakub Kicinski]

Hi!

Seems like something funny is going on with get_maintainer.pl since XDP
entry got added. We seem to have been CCed on:

net: ns83820: code cleanup for ns83820_probe_phy()
veth: Fix -Wformat-truncation
INFO: task hung in rtnetlink_rcv_msg

I tried Florian's veth patch myself and it does indeed produce:

"David S. Miller" <da...@davemloft.net> (odd fixer:NETWORKING DRIVERS,commit_signer:9/15=60%)
Alexei Starovoitov <a...@kernel.org> (supporter:XDP (eXpress Data Path))
Daniel Borkmann <dan...@iogearbox.net> (supporter:XDP (eXpress Data Path),commit_signer:6/15=40%)
Jakub Kicinski <jakub.k...@netronome.com> (supporter:XDP (eXpress Data Path))
Jesper Dangaard Brouer <ha...@kernel.org> (supporter:XDP (eXpress Data Path))
John Fastabend <john.fa...@gmail.com> (supporter:XDP (eXpress Data Path),commit_signer:2/15=13%)
Toshiaki Makita <makita....@lab.ntt.co.jp> (commit_signer:11/15=73%,authored:11/15=73%,added_lines:1027/1055=97%,removed_lines:180/195=92%)
David Ahern <dsa...@gmail.com> (commit_signer:2/15=13%,authored:1/15=7%)
Li RongQing <liron...@baidu.com> (authored:1/15=7%,removed_lines:14/195=7%)
Michael Walle <mic...@walle.cc> (authored:1/15=7%)
"Gustavo A. R. Silva" <gus...@embeddedor.com> (authored:1/15=7%)
net...@vger.kernel.org (open list:NETWORKING DRIVERS)
linux-...@vger.kernel.org (open list)
xdp-n...@vger.kernel.org (open list:XDP (eXpress Data Path))

Even though it only touches:

drivers/net/veth.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

And XDP entry is:

XDP (eXpress Data Path)
M: Alexei Starovoitov <a...@kernel.org>
M: Daniel Borkmann <dan...@iogearbox.net>
M: David S. Miller <da...@davemloft.net>
M: Jakub Kicinski <jakub.k...@netronome.com>
M: Jesper Dangaard Brouer <ha...@kernel.org>
M: John Fastabend <john.fa...@gmail.com>
L: net...@vger.kernel.org
L: xdp-n...@vger.kernel.org
S: Supported
F: net/core/xdp.c
F: include/net/xdp.h
F: kernel/bpf/devmap.c
F: kernel/bpf/cpumap.c
F: include/trace/events/xdp.h
K: xdp
N: xdp

So no relation to drivers at all...

[Joe Perches]

On Fri, 2019-02-22 at 12:01 -0800, Jakub Kicinski wrote:
> Hi!
>
> Seems like something funny is going on with get_maintainer.pl since XDP
> entry got added. We seem to have been CCed on:

I suggest removing the MAINTAINERS line with

K: xdp

as xdp is a pretty generic file/patch content
regex match for the K: type

$ git grep --name-only xdp | wc -l
236

Rather more files than desired.

The N: match is dubious too.

It's generally better to have specific lists of
maintained file patterns rather than using the
K: and N: pattern matches.

---
MAINTAINERS | 1 -
1 file changed, 1 deletion(-)

diff --git a/MAINTAINERS b/MAINTAINERS
index d7ad97b235ec..aa703e2cb882 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16970,7 +16970,6 @@ F: include/net/xdp.h

F: kernel/bpf/devmap.c
F: kernel/bpf/cpumap.c
F: include/trace/events/xdp.h

-K: xdp
N: xdp

XDP SOCKETS (AF_XDP)

[Jakub Kicinski]

Thanks for the explanation, at least now I know why it happens! :)
I'll leave it to Daniel to decide if we really need it removed,
so far the false positives weren't overwhelming, just surprising.

[Daniel Borkmann]

No strong opinion. I've seen this K+N pattern in a number of places
in the maintainers file. I'm fine either way if it gets too noisy. :)

[Jesper Dangaard Brouer]

On Sat, 23 Feb 2019 01:47:00 +0100
Daniel Borkmann <dan...@iogearbox.net> wrote:

> On 02/22/2019 10:45 PM, Jakub Kicinski wrote:
> > On Fri, 22 Feb 2019 12:14:57 -0800, Joe Perches wrote:
> >> On Fri, 2019-02-22 at 12:01 -0800, Jakub Kicinski wrote:
> >>> Hi!
> >>>
> >>> Seems like something funny is going on with get_maintainer.pl since XDP
> >>> entry got added. We seem to have been CCed on:
> >>
> >> I suggest removing the MAINTAINERS line with
> >>
> >> K: xdp
> >>
> >> as xdp is a pretty generic file/patch content
> >> regex match for the K: type
> >>
> >> $ git grep --name-only xdp | wc -l
> >> 236

I'm unsure how K: works, but you grep definitely selects some wrong files.

I tried with "xdp_":
git grep --name-only xdp_

That does catch all the driver that have XDP support, which is the
point of the exercise (to catch drivers).

It does contain a couple of false-positives:
drivers/net/ethernet/neterion/vxge/vxge-traffic.c
drivers/thunderbolt/tb_msgs.h
drivers/thunderbolt/xdomain.c
sound/soc/codecs/rt5670.c

Via the pattern '[^a-z]xdp_' I'm only left with the thunderbolt
false-positive, as it have a data struct's called tb_xdp_*.

> >> Rather more files than desired.
> >>
> >> The N: match is dubious too.
> >>
> >> It's generally better to have specific lists of
> >> maintained file patterns rather than using the
> >> K: and N: pattern matches.
> >>
> >> ---
> >> MAINTAINERS | 1 -
> >> 1 file changed, 1 deletion(-)
> >>
> >> diff --git a/MAINTAINERS b/MAINTAINERS
> >> index d7ad97b235ec..aa703e2cb882 100644
> >> --- a/MAINTAINERS
> >> +++ b/MAINTAINERS
> >> @@ -16970,7 +16970,6 @@ F: include/net/xdp.h
> >> F: kernel/bpf/devmap.c
> >> F: kernel/bpf/cpumap.c
> >> F: include/trace/events/xdp.h
> >> -K: xdp
> >> N: xdp
> >>
> >> XDP SOCKETS (AF_XDP)
> >
> > Thanks for the explanation, at least now I know why it happens! :)
> > I'll leave it to Daniel to decide if we really need it removed,
> > so far the false positives weren't overwhelming, just surprising.
>
> No strong opinion. I've seen this K+N pattern in a number of places
> in the maintainers file. I'm fine either way if it gets too noisy. :)

--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer

[Joe Perches]

Then it's probably better to use

K: \Wxdp_

and if XDP_ is also to be matched, maybe

K: (?i:\Wxdp_)

[Jesper Dangaard Brouer]

The last one seems to be the best at matching the relevant files :-)

[Hillf Danton]

On 22 Feb 2019 09:00:05 -0800

> HEAD commit: 64c0133eb88a Merge tag 'armsoc-fixes' of git://git.kernel...
> git tree: upstream

> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1189db74c00000

See if it could be reproduced upstream.

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+8218a8...@syzkaller.appspotmail.com

Tested on:

commit: 3a93e403 Merge tag 'for-linus' of git://git.kernel.org..
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13c10339c80000
kernel config: https://syzkaller.appspot.com/x/.config?x=af86302075529ad9
dashboard link: https://syzkaller.appspot.com/bug?extid=8218a8a0ff60c19b8eae
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.