INFO: task can't die in cangw_pernet

INFO: task can't die in cangw_pernet_exit
Status: auto-closed as invalid on 2021/03/24 08:16
Reported-by: syzbot+73da79d708b2241c830f@syzkaller.appspotmail.com
First crash: 314d, last: 269d
similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in cangw_pernet_exit (3)	syz	unreliable		218	now	37d	0/22	upstream: reported syz repro on 2021/09/12 19:22
Sample crash report:
INFO: task syz-executor.0:12004 can't die for more than 143 seconds.
task:syz-executor.0  state:D stack:24848 pid:12004 ppid: 10767 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007ff940cdbc68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffc28427a4f R14: 00007ff940cdc9c0 R15: 000000000119c034
INFO: task syz-executor.4:12041 can't die for more than 143 seconds.
task:syz-executor.4  state:D stack:26080 pid:12041 ppid: 10766 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f63b9fc6c68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffe32d3e9af R14: 00007f63b9fc79c0 R15: 000000000119c034
INFO: task syz-executor.3:12040 can't die for more than 144 seconds.
task:syz-executor.3  state:D stack:24960 pid:12040 ppid: 10770 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007fe04149ec68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffd7e9d022f R14: 00007fe04149f9c0 R15: 000000000119c034
INFO: task syz-executor.5:12069 can't die for more than 144 seconds.
task:syz-executor.5  state:D stack:25728 pid:12069 ppid:  8603 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007fa8a4031c68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007fff5254d86f R14: 00007fa8a40329c0 R15: 000000000119c034
INFO: task syz-executor.1:12129 can't die for more than 145 seconds.
task:syz-executor.1  state:D stack:25928 pid:12129 ppid: 10769 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007ff53589cc68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007ffd7f3d9b6f R14: 00007ff53589d9c0 R15: 000000000119c034
INFO: task syz-executor.2:12128 can't die for more than 145 seconds.
task:syz-executor.2  state:D stack:26312 pid:12128 ppid: 10768 flags:0x00004006
Call Trace:
 context_switch kernel/sched/core.c:4373 [inline]
 __schedule+0x90c/0x21a0 kernel/sched/core.c:5124
 schedule+0xcf/0x270 kernel/sched/core.c:5203
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:5262
 __mutex_lock_common kernel/locking/mutex.c:1033 [inline]
 __mutex_lock+0x81a/0x1110 kernel/locking/mutex.c:1103
 cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:187
 setup_net+0x508/0x850 net/core/net_namespace.c:365
 copy_net_ns+0x31e/0x760 net/core/net_namespace.c:483
 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110
 copy_namespaces+0x385/0x440 kernel/nsproxy.c:178
 copy_process+0x2ab5/0x6fd0 kernel/fork.c:2100
 kernel_clone+0xe7/0xab0 kernel/fork.c:2462
 __do_sys_clone3+0x1dd/0x2f0 kernel/fork.c:2737
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45e219
RSP: 002b:00007f2d0f5ffc68 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 000000000045e219
RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280
RBP: 000000000119c060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034
R13: 00007fffc188b5cf R14: 00007f2d0f6009c0 R15: 000000000119c034

Showing all locks held in the system:
2 locks held by kworker/0:2/8:
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246
 #1: ffff8880b9e20088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x305/0x440 kernel/sched/psi.c:833
4 locks held by kworker/u4:0/9:
1 lock held by khungtaskd/1662:
 #0: ffffffff8b370ea0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6326
1 lock held by in:imklog/8133:
 #0: ffff888024758d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947
3 locks held by kworker/1:4/9725:
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246
 #1: ffffc90015cd7da8 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250
 #2: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xb/0x60 net/core/link_watch.c:250
2 locks held by syz-executor.0/12004:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
3 locks held by kworker/1:7/12015:
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888010062d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246
 #1: ffffc9000d9c7da8 (deferred_process_work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250
 #2: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: switchdev_deferred_process_work+0xa/0x20 net/switchdev/switchdev.c:74
3 locks held by kworker/1:8/12016:
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff888147a5e938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x871/0x15f0 kernel/workqueue.c:2246
 #1: ffffc9000d997da8 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x8a5/0x15f0 kernel/workqueue.c:2250
 #2: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4570
2 locks held by syz-executor.4/12041:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
2 locks held by syz-executor.3/12040:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
2 locks held by syz-executor.5/12069:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
2 locks held by syz-executor.1/12129:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241
2 locks held by syz-executor.2/12128:
 #0: ffffffff8ca54ad0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2fa/0x760 net/core/net_namespace.c:479
 #1: ffffffff8ca67fc8 (rtnl_mutex){+.+.}-{3:3}, at: cangw_pernet_exit+0xe/0x20 net/can/gw.c:1241

=============================================
Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-linux-next-kasan-gce-root	2021/01/23 08:15	linux-next	bc085f8fc88f	52e37319	.config	log	report	info	INFO: task can't die in cangw_pernet_exit
ci-upstream-linux-next-kasan-gce-root	2020/12/12 10:05	linux-next	14240d4c5b25	bca53db9	.config	log	report	info
ci-upstream-linux-next-kasan-gce-root	2020/12/09 04:56	linux-next	a9e26cb5f261	40cc414d	.config	log	report	info