INFO: task kworker/u8:45:775 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:45   state:D stack:0     pid:775   tgid:775   ppid:2      flags:0x00004000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6027 [inline]
 __schedule+0x14ce/0x2100 kernel/sched/core.c:7894
 __schedule_loop kernel/sched/core.c:7975 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7990
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 linkwatch_event+0x12/0x60 net/core/link_watch.c:285
 process_one_work kernel/workqueue.c:3261 [inline]
 process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3342
 worker_thread+0xc51/0x1370 kernel/workqueue.c:3423
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task syz-executor:1398 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D
 stack:0     pid:1398  tgid:1398  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6027 [inline]
 __schedule+0x14ce/0x2100 kernel/sched/core.c:7894
 __schedule_loop kernel/sched/core.c:7975 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7990
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 ip_tunnel_init_net+0x30c/0x890 net/ipv4/ip_tunnel.c:1145
 ipgre_init_net+0x28/0x30 net/ipv4/ip_gre.c:1070
 ops_init+0x1af/0x5d0 net/core/net_namespace.c:139
 setup_net+0x227/0x9b0 net/core/net_namespace.c:356
 copy_net_ns+0x512/0xa30 net/core/net_namespace.c:510
 create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x503/0x8d0 kernel/fork.c:3374
 __do_sys_unshare kernel/fork.c:3457 [inline]
 __se_sys_unshare kernel/fork.c:3455 [inline]
 __x64_sys_unshare+0x3c/0x50 kernel/fork.c:3455
 x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb9fbb9e127
RSP: 002b:00007ffdfc5464f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fb9fbe15f40 RCX: 00007fb9fbb9e127
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007fb9fbe167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffdfc546738 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:1402 blocked for more than 126 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:1402  tgid:1402  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6027 [inline]
 __schedule+0x14ce/0x2100 kernel/sched/core.c:7894
 __schedule_loop kernel/sched/core.c:7975 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7990
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 ip_tunnel_init_net+0x30c/0x890 net/ipv4/ip_tunnel.c:1145
 ipgre_init_net+0x28/0x30 net/ipv4/ip_gre.c:1070
 ops_init+0x1af/0x5d0 net/core/net_namespace.c:139
 setup_net+0x227/0x9b0 net/core/net_namespace.c:356
 copy_net_ns+0x512/0xa30 net/core/net_namespace.c:510
 create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x503/0x8d0 kernel/fork.c:3374
 __do_sys_unshare kernel/fork.c:3457 [inline]
 __se_sys_unshare kernel/fork.c:3455 [inline]
 __x64_sys_unshare+0x3c/0x50 kernel/fork.c:3455
 x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fd661f9e127
RSP: 002b:00007ffe39cbfb78 EFLAGS: 00000206 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007fd662215f40 RCX: 00007fd661f9e127
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007fd6622167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffe39cbfdb8 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:1403 blocked for more than 126 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:1403  tgid:1403  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6027 [inline]
 __schedule+0x14ce/0x2100 kernel/sched/core.c:7894
 __schedule_loop kernel/sched/core.c:7975 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7990
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 ip_tunnel_init_net+0x30c/0x890 net/ipv4/ip_tunnel.c:1145
 ipgre_init_net+0x28/0x30 net/ipv4/ip_gre.c:1070
 ops_init+0x1af/0x5d0 net/core/net_namespace.c:139
 setup_net+0x227/0x9b0 net/core/net_namespace.c:356
 copy_net_ns+0x512/0xa30 net/core/net_namespace.c:510
 create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x503/0x8d0 kernel/fork.c:3374
 __do_sys_unshare kernel/fork.c:3457 [inline]
 __se_sys_unshare kernel/fork.c:3455 [inline]
 __x64_sys_unshare+0x3c/0x50 kernel/fork.c:3455
 x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7ff77199e127
RSP: 002b:00007fffbfd6b2f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007ff771c15f40 RCX: 00007ff77199e127
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007ff771c167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007fffbfd6b538 R15: 0000000000000000
 </TASK>
INFO: task syz-executor:1404 blocked for more than 128 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:0     pid:1404  tgid:1404  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6027 [inline]
 __schedule+0x14ce/0x2100 kernel/sched/core.c:7894
 __schedule_loop kernel/sched/core.c:7975 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7990
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:8047
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x960/0x1bc0 kernel/locking/mutex.c:805
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1136
 mutex_lock+0x113/0x1d0 kernel/locking/mutex.c:285
 rtnl_lock+0x19/0x20 net/core/rtnetlink.c:79
 ip_tunnel_init_net+0x30c/0x890 net/ipv4/ip_tunnel.c:1145
 ipip_init_net+0x2d/0x40 net/ipv4/ipip.c:601
 ops_init+0x1af/0x5d0 net/core/net_namespace.c:139
 setup_net+0x227/0x9b0 net/core/net_namespace.c:356
 copy_net_ns+0x512/0xa30 net/core/net_namespace.c:510
 create_new_namespaces+0x3b5/0x720 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x124/0x180 kernel/nsproxy.c:228
 ksys_unshare+0x503/0x8d0 kernel/fork.c:3374
 __do_sys_unshare kernel/fork.c:3457 [inline]
 __se_sys_unshare kernel/fork.c:3455 [inline]
 __x64_sys_unshare+0x3c/0x50 kernel/fork.c:3455
 x64_sys_call+0x2998/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:273
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f7077b9e127
RSP: 002b:00007ffc68b89d38 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f7077e15f40 RCX: 00007f7077b9e127
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f7077e167b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc68b89f78 R15: 0000000000000000
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 455e6e6e4058e005312aabb3f62c8d3b97c06770
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xdad/0xf00 kernel/hung_task.c:423
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 20 Comm: rcuop/0 Not tainted syzkaller #0 455e6e6e4058e005312aabb3f62c8d3b97c06770
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x70 kernel/kcov.c:217
Code: 48 8b 45 08 65 48 8b 0d 3c 23 7d 7e 65 8b 15 3d 23 7d 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 ec 0b 00 00 00 <74> 2c 8b 91 c8 0b 00 00 83 fa 02 75 21 48 8b 91 d0 0b 00 00 48 8b
RSP: 0018:ffffc900000072b0 EFLAGS: 00000246
RAX: ffffffff85001953 RBX: ffffc900000076b0 RCX: ffff888103664c00
RDX: 0000000000000100 RSI: ffff88810872bc00 RDI: ffff88810872bc00
RBP: ffffc900000072b0 R08: ffffc90000007518 R09: 0000000000000017
R10: ffffc900000076b0 R11: fffff52000000eda R12: ffff88810872bc00
R13: dffffc0000000000 R14: ffff88810872bc00 R15: ffffc90000007518
FS:  0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0e0a747e20 CR3: 000000010cf4a000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 __find_rr_leaf+0xa3/0x840 net/ipv6/route.c:829
 find_rr_leaf net/ipv6/route.c:893 [inline]
 rt6_select net/ipv6/route.c:934 [inline]
 fib6_table_lookup+0x330/0x9e0 net/ipv6/route.c:2242
 ip6_pol_route+0x17a/0x1370 net/ipv6/route.c:2278
 ip6_pol_route_input+0x5a/0x80 net/ipv6/route.c:2335
 pol_lookup_func include/net/ip6_fib.h:645 [inline]
 fib6_rule_lookup+0x4ee/0x6d0 net/ipv6/fib6_rules.c:117
 ip6_route_input_lookup net/ipv6/route.c:2347 [inline]
 ip6_route_input+0x62e/0x8f0 net/ipv6/route.c:2643
 ip6_rcv_finish_core net/ipv6/ip6_input.c:66 [inline]
 ip6_rcv_finish+0x15a/0x3c0 net/ipv6/ip6_input.c:77
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ipv6_rcv+0xf1/0x240 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5801 [inline]
 __netif_receive_skb net/core/dev.c:5914 [inline]
 process_backlog+0x44b/0xad0 net/core/dev.c:6250
 __napi_poll+0xd3/0x610 net/core/dev.c:6901
 napi_poll net/core/dev.c:6970 [inline]
 net_rx_action+0x5ea/0xd80 net/core/dev.c:7092
 handle_softirqs+0x1aa/0x630 kernel/softirq.c:621
 __do_softirq+0xf/0x16 kernel/softirq.c:659
 do_softirq+0xb8/0x110 kernel/softirq.c:503
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_do_batch+0x5d9/0xd40 kernel/rcu/tree.c:2594
 nocb_cb_wait kernel/rcu/tree_nocb.h:923 [inline]
 rcu_nocb_cb_kthread+0x524/0xb30 kernel/rcu/tree_nocb.h:957
 kthread+0x2c9/0x370 kernel/kthread.c:389
 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>