INFO: task hung in ip6gre_exit_batch

Kernel	Title	Repro	Cause bisect	Count	Last	Reported	Patched	Status
upstream	INFO: task hung in ip6gre_exit_batch_net (6) net			1	287d	287d	0/26	closed as invalid on 2023/09/07 14:36
upstream	INFO: task hung in ip6gre_exit_batch_net (2) net			3	1620d	1621d	0/26	auto-closed as invalid on 2020/01/17 16:16
linux-4.19	INFO: task hung in ip6gre_exit_batch_net (3)			7	834d	1001d	0/1	auto-closed as invalid on 2022/05/13 06:16
upstream	INFO: task hung in ip6gre_exit_batch_net (4) net	syz	unreliable	44	888d	939d	0/26	closed as invalid on 2021/12/14 20:12
upstream	INFO: task hung in ip6gre_exit_batch_net net			6	1659d	2152d	0/26	closed as dup on 2018/06/04 15:23
upstream	INFO: task hung in ip6gre_exit_batch_net (5) net			1	665d	665d	0/26	auto-closed as invalid on 2022/09/28 06:40
linux-4.19	INFO: task hung in ip6gre_exit_batch_net			1	1638d	1637d	0/1	auto-closed as invalid on 2020/02/29 06:17
upstream	INFO: task hung in ip6gre_exit_batch_net (3) net			18	1123d	1438d	0/26	auto-closed as invalid on 2021/06/27 10:57

Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci3: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout Bluetooth: hci4: command 0x0406 tx timeout INFO: task kworker/u4:1:23 blocked for more than 140 seconds. Not tainted 4.19.161-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:1 D25992 23 2 0x80000000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072 ip6gre_exit_batch_net+0x82/0x6c0 net/ipv6/ip6_gre.c:1624 ops_exit_list+0xf9/0x150 net/core/net_namespace.c:156 cleanup_net+0x3b4/0x8b0 net/core/net_namespace.c:553 process_one_work+0x864/0x1570 kernel/workqueue.c:2155 worker_thread+0x64c/0x1130 kernel/workqueue.c:2298 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 INFO: task syz-executor.1:12547 blocked for more than 140 seconds. Not tainted 4.19.161-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29024 12547 8142 0x80000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline] _synchronize_rcu_expedited+0x60c/0x6f0 kernel/rcu/tree_exp.h:667 synchronize_rcu+0xc6/0x160 kernel/rcu/tree_plugin.h:818 cfcnfg_remove+0x2b/0x8f net/caif/cfcnfg.c:121 caif_exit_net+0x34d/0x450 net/caif/caif_dev.c:538 ops_exit_list+0xa5/0x150 net/core/net_namespace.c:153 setup_net+0x3d1/0x720 net/core/net_namespace.c:332 copy_net_ns+0x1f7/0x335 net/core/net_namespace.c:438 create_new_namespaces+0x3f6/0x7b0 kernel/nsproxy.c:107 unshare_nsproxy_namespaces+0xbd/0x1f0 kernel/nsproxy.c:206 ksys_unshare+0x36c/0x9a0 kernel/fork.c:2551 __do_sys_unshare kernel/fork.c:2619 [inline] __se_sys_unshare kernel/fork.c:2617 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:2617 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45e0f9 Code: 2a 03 00 00 48 83 ec 58 48 89 6c 24 50 48 8d 6c 24 50 8b 44 24 68 85 c0 0f 84 3a 02 00 00 48 8b 4c 24 60 48 8d 15 07 96 b0 00 <eb> 07 48 8b 92 c0 01 00 00 48 85 d2 0f 84 15 02 00 00 48 39 8a c8 RSP: 002b:00007fb85b653c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 000000000045e0f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000 RBP: 000000000119c100 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00007ffdf6acb49f R14: 00007fb85b6549c0 R15: 000000000119c0dc INFO: task syz-executor.2:12592 blocked for more than 140 seconds. Not tainted 4.19.161-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28648 12592 8144 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1002 [inline] __mutex_lock+0x647/0x1260 kernel/locking/mutex.c:1072 tun_detach drivers/net/tun.c:751 [inline] tun_chr_close+0x3a/0x180 drivers/net/tun.c:3267 __fput+0x2ce/0x890 fs/file_table.c:278 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x417a51 Code: 24 48 8b 4c 24 40 48 89 4c 24 08 e8 29 f4 00 00 8b 44 24 18 8b 4c 24 1c 39 c8 75 22 48 8b 44 24 38 48 89 04 24 e8 1f 33 ff ff <8b> 44 24 18 8b 4c 24 1c 39 c8 48 8b 44 24 40 e9 5a ff ff ff 48 8b RSP: 002b:00007fffbc661810 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000417a51 RDX: 0000000000000000 RSI: ffffffff88158bd8 RDI: 0000000000000005 RBP: 0000000000000001 R08: ffffffff8100432f R09: 0000000030ea99eb R10: 0000000030ea99ef R11: 0000000000000293 R12: 000000000119ca00 R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c034 Showing all locks held in the system: 4 locks held by kworker/u4:1/23: #0: 00000000ac5e79ae ((wq_completion)"%s""netns"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126 #1: 000000004c247ca4 (net_cleanup_work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 #2: 000000008baa0333 (pernet_ops_rwsem){++++}, at: cleanup_net+0xa8/0x8b0 net/core/net_namespace.c:520 #3: 00000000b088fae5 (rtnl_mutex){+.+.}, at: ip6gre_exit_batch_net+0x82/0x6c0 net/ipv6/ip6_gre.c:1624 1 lock held by khungtaskd/1566: #0: 00000000d670c100 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 3 locks held by kworker/0:2/3670: #0: 00000000a5098d7f ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2126 #1: 000000009ba5ba0f ((addr_chk_work).work){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2130 #2: 00000000b088fae5 (rtnl_mutex){+.+.}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4475 3 locks held by syz-executor.1/12547: #0: 000000008baa0333 (pernet_ops_rwsem){++++}, at: copy_net_ns+0x1d8/0x335 net/core/net_namespace.c:434 #1: 00000000b088fae5 (rtnl_mutex){+.+.}, at: caif_exit_net+0x38/0x450 net/caif/caif_dev.c:517 #2: 000000002bc8f7e8 (&caifn->caifdevs.lock){+.+.}, at: caif_exit_net+0x4f/0x450 net/caif/caif_dev.c:518 1 lock held by syz-executor.2/12592: #0: 00000000b088fae5 (rtnl_mutex){+.+.}, at: tun_detach drivers/net/tun.c:751 [inline] #0: 00000000b088fae5 (rtnl_mutex){+.+.}, at: tun_chr_close+0x3a/0x180 drivers/net/tun.c:3267 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1566 Comm: khungtaskd Not tainted 4.19.161-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60