INFO: task hung in switchdev_deferred_process

INFO: task hung in switchdev_deferred_process_work (2)
Status: upstream: reported on 2020/07/27 17:04
Reported-by: syzbot+8ecc009e206a956ab317@syzkaller.appspotmail.com
First crash: 118d, last: 2d22h

similar bugs (2):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in switchdev_deferred_process_work			35	305d	841d	0/17	closed as invalid on 2019/10/23 07:26
linux-4.19	INFO: task hung in switchdev_deferred_process_work			13	24d	156d	0/1	upstream: reported on 2020/03/08 04:06

Sample crash report:

INFO: task kworker/1:88:31265 blocked for more than 143 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:88    D27792 31265      2 0x00004000
Workqueue: events switchdev_deferred_process_work
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task kworker/u4:0:26132 blocked for more than 143 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:0    D24952 26132      2 0x00004000
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 caif_exit_net+0x2cd/0x8c0 net/caif/caif_dev.c:522
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 cleanup_net+0x4ea/0xa00 net/core/net_namespace.c:603
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task kworker/1:7:19541 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/1:7     D27736 19541      2 0x00004000
Workqueue: events linkwatch_event
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 linkwatch_event+0xb/0x60 net/core/link_watch.c:250
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task syz-executor.4:23737 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D28656 23737   7312 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 setup_net+0x502/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007fb620accc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00000000000355c0 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000078bf30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007fffa84fe1ff R14: 00007fb620acd9c0 R15: 000000000078bf0c
INFO: task syz-executor.4:23741 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D27840 23741   7312 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007fb620aabc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c080 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007fffa84fe1ff R14: 00007fb620aac9c0 R15: 000000000078bfac
INFO: task syz-executor.4:23770 blocked for more than 145 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D27568 23770   7312 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 setup_net+0x502/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007fb620a69c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00000000000355c0 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000078c110 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0ec
R13: 00007fffa84fe1ff R14: 00007fb620a6a9c0 R15: 000000000078c0ec
INFO: task syz-executor.4:23777 blocked for more than 146 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.4  D27888 23777   7312 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007fb620a48c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c080 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 000000000078c1c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c18c
R13: 00007fffa84fe1ff R14: 00007fb620a499c0 R15: 000000000078c18c
INFO: task syz-executor.3:23743 blocked for more than 146 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D28624 23743   7267 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 setup_net+0x502/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007f6b4235bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00000000000355c0 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000078bf30 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bf0c
R13: 00007ffca511a8df R14: 00007f6b4235c9c0 R15: 000000000078bf0c
INFO: task syz-executor.3:23745 blocked for more than 147 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D27128 23745   7267 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 rtnl_lock net/core/rtnetlink.c:72 [inline]
 rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
 netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
 sock_sendmsg_nosec net/socket.c:652 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:672
 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2406
 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007f6b4233ac78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 000000000002c080 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000020000480 RDI: 0000000000000003
RBP: 000000000078bfe0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac
R13: 00007ffca511a8df R14: 00007f6b4233b9c0 R15: 000000000078bfac
INFO: task syz-executor.3:23746 blocked for more than 148 seconds.
      Not tainted 5.8.0-rc7-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.3  D27824 23746   7267 0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x8ea/0x2210 kernel/sched/core.c:4219
 schedule+0xd0/0x2a0 kernel/sched/core.c:4294
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4353
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x3e2/0x10d0 kernel/locking/mutex.c:1103
 gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186
 setup_net+0x502/0x850 net/core/net_namespace.c:364
 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482
 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:231
 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2983
 __do_sys_unshare kernel/fork.c:3051 [inline]
 __se_sys_unshare kernel/fork.c:3049 [inline]
 __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3049
 do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45cc79
Code: Bad RIP value.
RSP: 002b:00007f6b42319c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00000000000355c0 RCX: 000000000045cc79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 000000000078c070 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c04c
R13: 00007ffca511a8df R14: 00007f6b4231a9c0 R15: 000000000078c04c

Showing all locks held in the system:
1 lock held by khungtaskd/1158:
 #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
1 lock held by in:imklog/6525:
 #0: ffff88809059caf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
3 locks held by kworker/1:49/20721:
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888099833938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc90002287da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
 #2: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4543
3 locks held by kworker/1:88/31265:
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc90008547da8 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
 #2: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
4 locks held by kworker/u4:0/26132:
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8880a97c3138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc90001cd7da8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
 #2: ffffffff8a7b1030 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa00 net/core/net_namespace.c:565
 #3: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: caif_exit_net+0x2cd/0x8c0 net/caif/caif_dev.c:522
3 locks held by kworker/1:7/19541:
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc90002477da8 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
 #2: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:250
2 locks held by kworker/1:8/23430:
2 locks held by syz-executor.5/23734:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
 #1: ffffffff89bc5820 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
 #1: ffffffff89bc5820 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x4e8/0x5f0 kernel/rcu/tree_exp.h:838
2 locks held by syz-executor.4/23737:
 #0: ffffffff8a7b1030 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2ac/0x5e0 net/core/net_namespace.c:478
 #1: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
1 lock held by syz-executor.4/23741:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
2 locks held by syz-executor.4/23770:
 #0: ffffffff8a7b1030 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2ac/0x5e0 net/core/net_namespace.c:478
 #1: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
1 lock held by syz-executor.4/23777:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
2 locks held by syz-executor.3/23743:
 #0: ffffffff8a7b1030 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2ac/0x5e0 net/core/net_namespace.c:478
 #1: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
1 lock held by syz-executor.3/23745:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x3f9/0xad0 net/core/rtnetlink.c:5458
2 locks held by syz-executor.3/23746:
 #0: ffffffff8a7b1030 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2ac/0x5e0 net/core/net_namespace.c:478
 #1: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: gtp_net_exit+0x1b5/0x380 drivers/net/gtp.c:1353
1 lock held by syz-executor.2/23765:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x1a3/0xc40 net/core/dev_ioctl.c:495
1 lock held by syz-executor.2/23769:
 #0: ffffffff8a7bde28 (rtnl_mutex){+.+.}-{3:3}, at: dev_ioctl+0x1a3/0xc40 net/core/dev_ioctl.c:495

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

NMI backtrace for cpu 0
CPU: 0 PID: 1158 Comm: khungtaskd Not tainted 5.8.0-rc7-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+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd7d/0x1000 kernel/hung_task.c:295
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 23845 Comm: (md-udevd) Not tainted 5.8.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_is_held_type+0x0/0xe0 kernel/locking/lockdep.c:4985
Code: 85 c0 75 c8 48 c7 c6 e0 aa 4b 88 48 c7 c7 20 ab 4b 88 89 04 24 e8 c2 aa 5c f9 0f 0b 8b 04 24 e9 f0 fe ff ff 66 0f 1f 44 00 00 <41> 57 41 56 41 55 41 54 55 53 48 83 ec 08 65 48 8b 2c 25 00 ff 01
RSP: 0018:ffffc900063f7f00 EFLAGS: 00000002
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff1304729
RDX: 1ffffffff137884e RSI: 00000000ffffffff RDI: ffffffff89bc1100
RBP: ffffc900063f7f58 R08: 0000000000000000 R09: ffffffff8aaf264f
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: ffffffff87e81067 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f54fd482500(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f00ef3cf000 CR3: 000000002ee3c000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lock_is_held include/linux/lockdep.h:425 [inline]
 rcu_read_lock_sched_held+0x3a/0xb0 kernel/rcu/update.c:135
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish kernel/trace/trace_preemptirq.c:67 [inline]
 trace_hardirqs_off_finish+0x26b/0x2d0 kernel/trace/trace_preemptirq.c:61
 enter_from_user_mode arch/x86/entry/common.c:102 [inline]
 do_syscall_64+0x17/0xe0 arch/x86/entry/common.c:374
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f54fbd2028d
Code: c1 20 00 00 75 10 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 ee fb ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 37 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffdc87c18b0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: ffffffffffffffda RBX: 000000000002fc4e RCX: 00007f54fbd2028d
RDX: 00007ffdc87c193c RSI: 00007ffdc87c1930 RDI: 000000000002fc4e
RBP: 0000000000100000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000293 R12: 0000000000000003
R13: 00007ffdc87c1930 R14: 0000000000000000 R15: 00007ffdc87c1bb0

Crashes (39):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce-selinux-root	2020/08/02 11:28	upstream	ac3a0c84	63a73341	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/08/01 10:14	upstream	7dc6fd0f	d895b3be	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/07/23 16:59	upstream	d15be546	340ea530	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/14 19:18	upstream	0dc589da	609fb517	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/11 16:48	upstream	a581387e	18d18b59	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/07 06:25	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce	2020/07/06 05:26	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce	2020/07/05 19:50	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/05 15:55	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce	2020/07/05 04:38	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/04 07:35	upstream	7cc2a8ea	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/07/03 21:08	upstream	7cc2a8ea	bed10395	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/03 06:34	upstream	cd77006e	bed10395	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/07/02 08:54	upstream	cd77006e	bed10395	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce	2020/07/01 20:01	upstream	7c30b859	39acb39d	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/07/01 05:46	upstream	9ebcfadb	917afeaa	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/07/01 05:06	upstream	9ebcfadb	917afeaa	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2020/06/28 09:42	upstream	1590a2e1	ffec44b5	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce	2020/06/24 17:33	upstream	7ae77150	54566aff	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/05/31 15:42	upstream	ffeb595d	a0331e89	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2020/05/22 16:00	upstream	051143e1	9682898d	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/04/25 16:04	upstream	5ef58e29	b8bb8e5f	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-kasan-gce-root	2020/04/15 18:36	upstream	8632e9b5	3f3c5574	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-this-kasan-gce	2020/08/08 11:33	net	c7ca03c2	ff51e522	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-this-kasan-gce	2020/06/24 12:55	net	b835a71e	54566aff	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/08/08 21:07	net-next	bfdd5aaa	f721e4a0	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/08/06 17:45	net-next	c1055b76	1f122f88	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/08/04 13:40	net-next	2f631133	196277c4	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/07/31 19:21	net-next	bd69058f	d895b3be	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/07/31 03:30	net-next	41d707b7	8df85ed9	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/07/24 13:22	net-next	1b6687e3	554af388	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/07/23 16:32	net-next	7fc3b978	340ea530	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-net-kasan-gce	2020/07/02 15:48	net-next	23212a70	bed10395	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-bpf-next-kasan-gce	2020/06/30 19:43	bpf-next	cb8e59cc	917afeaa	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-bpf-next-kasan-gce	2020/06/18 11:49	bpf-next	cb8e59cc	d45a4d69	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-bpf-next-kasan-gce	2020/04/24 16:09	bpf-next	3f2eaebb	03d97a1b	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/07/06 13:46	linux-next	9e50b94b	51095195	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/06/16 04:26	linux-next	e7b08814	baca2611	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2020/05/09 06:42	linux-next	ac935d22	e97b06d3	.config	log	report	davem@davemloft.net, ivecera@redhat.com, jiri@resnulli.us, kuba@kernel.org, linux-kernel@vger.kernel.org, netdev@vger.kernel.org