INFO: task syz-executor:291 blocked for more than 122 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:291   tgid:291   ppid:1      flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 synchronize_rcu_expedited+0x6b0/0x7b0 kernel/rcu/tree_exp.h:991
 namespace_unlock+0x1ec/0x3d0 fs/namespace.c:1700
 do_umount fs/namespace.c:1927 [inline]
 path_umount+0xeb4/0xf40 fs/namespace.c:2010
 ksys_umount fs/namespace.c:2033 [inline]
 __do_sys_umount fs/namespace.c:2038 [inline]
 __se_sys_umount fs/namespace.c:2036 [inline]
 __x64_sys_umount+0x126/0x170 fs/namespace.c:2036
 x64_sys_call+0x2ab8/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:167
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f3ab7d8ff17
RSP: 002b:00007ffc76b60b68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: ffffffffffffffda RBX: 00007f3ab7e11c05 RCX: 00007f3ab7d8ff17
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc76b60c20
RBP: 00007ffc76b60c20 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc76b61cb0
R13: 00007f3ab7e11c05 R14: 000000000000dcf9 R15: 00007ffc76b61cf0
 </TASK>
INFO: task kworker/u8:4:329 blocked for more than 124 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:4    state:D stack:0     pid:329   tgid:329   ppid:2      flags:0x00004000
Workqueue: events_unbound linkwatch_event
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x102/0x1c0 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:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task kworker/0:3:472 blocked for more than 125 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:3     state:D stack:0     pid:472   tgid:472   ppid:2      flags:0x00004000
Workqueue: events xfrm_state_gc_task
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
 synchronize_rcu_expedited+0x4ee/0x7b0 kernel/rcu/tree_exp.h:976
 synchronize_rcu+0x77/0x2e0 kernel/rcu/tree.c:4119
 xfrm_state_gc_task+0xca/0x170 net/xfrm/xfrm_state.c:569
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
INFO: task syz.1.505:1928 blocked for more than 126 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.505       state:D stack:0     pid:1928  tgid:1928  ppid:289    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7944
 __mutex_lock_common kernel/locking/mutex.c:707 [inline]
 __mutex_lock+0x81e/0x1b50 kernel/locking/mutex.c:803
 __mutex_lock_slowpath+0xe/0x20 kernel/locking/mutex.c:1134
 mutex_lock+0x102/0x1c0 kernel/locking/mutex.c:285
 exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
 synchronize_rcu_expedited+0x288/0x7b0 kernel/rcu/tree_exp.h:976
 synchronize_rcu+0x77/0x2e0 kernel/rcu/tree.c:4119
 synchronize_net+0x38/0x40 net/core/dev.c:11370
 packet_release+0x9f8/0xd50 net/packet/af_packet.c:3216
 __sock_release net/socket.c:659 [inline]
 sock_close+0xda/0x280 net/socket.c:1427
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fbe4278ebe9
RSP: 002b:00007ffc8c57f678 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000011399 RCX: 00007fbe4278ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fbe429c7da0 R08: 0000000000000001 R09: 0000001d8c57f96f
R10: 0000001b2dd20000 R11: 0000000000000246 R12: 00007fbe429c5fac
R13: 00007fbe429c5fa0 R14: ffffffffffffffff R15: 00007ffc8c57f790
 </TASK>
INFO: task syz.4.508:1940 blocked for more than 127 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.508       state:D stack:0     pid:1940  tgid:1939  ppid:1222   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
 synchronize_rcu_expedited+0x4ee/0x7b0 kernel/rcu/tree_exp.h:976
 bdi_remove_from_list mm/backing-dev.c:1150 [inline]
 bdi_unregister+0x16e/0x8a0 mm/backing-dev.c:1158
 generic_shutdown_super+0x25f/0x300 fs/super.c:685
 kill_anon_super+0x4b/0x1d0 fs/super.c:1240
 v9fs_kill_super+0x50/0x90 fs/9p/vfs_super.c:193
 deactivate_locked_super+0xd8/0x2a0 fs/super.c:476
 deactivate_super+0xb8/0xe0 fs/super.c:509
 cleanup_mnt+0x3f1/0x480 fs/namespace.c:1370
 __cleanup_mnt+0x1d/0x40 fs/namespace.c:1377
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7fb37058ebe9
RSP: 002b:00007fb36efe3038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: fffffffffffffffe RBX: 00007fb3707c5fa0 RCX: 00007fb37058ebe9
RDX: 00002000000003c0 RSI: 0000200000000500 RDI: 0000000000000000
RBP: 00007fb370611e19 R08: 0000200000000200 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb3707c6038 R14: 00007fb3707c5fa0 R15: 00007fff86dc9968
 </TASK>
INFO: task syz.3.510:1947 blocked for more than 128 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.510       state:D stack:0     pid:1947  tgid:1947  ppid:288    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
 synchronize_rcu_expedited+0x4ee/0x7b0 kernel/rcu/tree_exp.h:976
 synchronize_rcu+0x77/0x2e0 kernel/rcu/tree.c:4119
 pfkey_release+0x2a3/0x370 net/key/af_key.c:185
 __sock_release net/socket.c:659 [inline]
 sock_close+0xda/0x280 net/socket.c:1427
 __fput+0x1fe/0xa00 fs/file_table.c:429
 ____fput+0x20/0x30 fs/file_table.c:457
 task_work_run+0x1e3/0x250 kernel/task_work.c:240
 resume_user_mode_work+0x36/0x50 include/linux/resume_user_mode.h:50
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x64/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f3e0658ebe9
RSP: 002b:00007ffe329fbd08 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000012541 RCX: 00007f3e0658ebe9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f3e067c7da0 R08: 0000000000000001 R09: 00000009329fbfff
R10: 0000001b2df20000 R11: 0000000000000246 R12: 00007f3e067c5fac
R13: 00007f3e067c5fa0 R14: ffffffffffffffff R15: 00007ffe329fbe20
 </TASK>
INFO: task syz-executor:1950 blocked for more than 129 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:1950  tgid:1950  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x1322/0x1df0 kernel/sched/core.c:7791
 __schedule_loop kernel/sched/core.c:7872 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7887
 exp_funnel_lock kernel/rcu/tree_exp.h:320 [inline]
 synchronize_rcu_expedited+0x4ee/0x7b0 kernel/rcu/tree_exp.h:976
 synchronize_net net/core/dev.c:11368 [inline]
 netif_set_real_num_tx_queues+0x4c3/0x7e0 net/core/dev.c:3028
 veth_init_queues drivers/net/veth.c:1756 [inline]
 veth_newlink+0x893/0xc20 drivers/net/veth.c:1873
 rtnl_newlink_create net/core/rtnetlink.c:3542 [inline]
 __rtnl_newlink net/core/rtnetlink.c:3762 [inline]
 rtnl_newlink+0x14a3/0x2130 net/core/rtnetlink.c:3775
 rtnetlink_rcv_msg+0x882/0xa00 net/core/rtnetlink.c:6678
 netlink_rcv_skb+0x22b/0x4a0 net/netlink/af_netlink.c:2555
 rtnetlink_rcv+0x20/0x30 net/core/rtnetlink.c:6696
 netlink_unicast_kernel net/netlink/af_netlink.c:1323 [inline]
 netlink_unicast+0x8c3/0xa60 net/netlink/af_netlink.c:1349
 netlink_sendmsg+0x7f0/0xaf0 net/netlink/af_netlink.c:1899
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg net/socket.c:745 [inline]
 __sys_sendto+0x66a/0x6f0 net/socket.c:2217
 __do_sys_sendto net/socket.c:2229 [inline]
 __se_sys_sendto net/socket.c:2225 [inline]
 __x64_sys_sendto+0xe9/0x100 net/socket.c:2225
 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x58/0xf0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f5c3cf90a23
RSP: 002b:00007fff932e1a68 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f5c3dcf4620 RCX: 00007f5c3cf90a23
RDX: 000000000000002c RSI: 00007f5c3dcf4670 RDI: 0000000000000003
RBP: 0000000000000001 R08: 00007fff932e1a84 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f5c3dcf4670 R15: 0000000000000000
 </TASK>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 3aa8e93a75ec4fb080c21ea51d8727149e6cfac5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x10c/0x190 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2bf/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+0xd8f/0xed0 kernel/hung_task.c:423
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 45 Comm: kworker/1:1 Not tainted syzkaller #0 3aa8e93a75ec4fb080c21ea51d8727149e6cfac5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: mld mld_query_work
RIP: 0010:__asan_memset+0x3e/0x50 mm/kasan/shadow.c:88
Code: 89 ff 48 8b 4d 08 48 89 d6 ba 01 00 00 00 e8 39 e4 ff ff 84 c0 74 10 4c 89 ff 44 89 f6 48 89 da e8 87 3f b0 03 eb 02 31 c0 5b <41> 5e 41 5f 5d e9 18 7f b2 03 cc 0f 1f 80 00 00 00 00 b8 cf f9 60
RSP: 0018:ffffc900002300a0 EFLAGS: 00000246
RAX: ffffc90000230210 RBX: ffffc90000230210 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90000230230
RBP: ffffc900002300b0 R08: ffffc9000023022f R09: 0000000000000000
R10: ffffc90000230210 R11: fffff52000046046 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90000230210
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc8c57dff8 CR3: 00000000072a8000 CR4: 00000000003526b0
Call Trace:
 <IRQ>
 ip6t_do_table+0xd4/0x14d0 net/ipv6/netfilter/ip6_tables.c:261
 nf_hook_entry_hookfn include/linux/netfilter.h:155 [inline]
 nf_hook_slow+0xd2/0x240 net/netfilter/core.c:626
 nf_hook include/linux/netfilter.h:272 [inline]
 NF_HOOK include/linux/netfilter.h:315 [inline]
 ip6_input+0x320/0x380 net/ipv6/ip6_input.c:490
 ip6_mc_input+0x35a/0x670 net/ipv6/ip6_input.c:584
 dst_input include/net/dst.h:469 [inline]
 ip6_rcv_finish+0x344/0x3c0 net/ipv6/ip6_input.c:79
 NF_HOOK include/linux/netfilter.h:317 [inline]
 ipv6_rcv+0xed/0x220 net/ipv6/ip6_input.c:309
 __netif_receive_skb_one_core net/core/dev.c:5757 [inline]
 __netif_receive_skb net/core/dev.c:5870 [inline]
 netif_receive_skb_internal net/core/dev.c:5956 [inline]
 netif_receive_skb+0x147/0x7b0 net/core/dev.c:6015
 br_netif_receive_skb net/bridge/br_input.c:30 [inline]
 NF_HOOK include/linux/netfilter.h:317 [inline]
 br_pass_frame_up+0x126/0x1c0 net/bridge/br_input.c:70
 br_handle_frame_finish+0x12d9/0x1720 net/bridge/br_input.c:221
 nf_hook_bridge_pre net/bridge/br_input.c:301 [inline]
 br_handle_frame+0x5a6/0xba0 net/bridge/br_input.c:424
 __netif_receive_skb_core+0xf4b/0x3940 net/core/dev.c:5651
 __netif_receive_skb_one_core net/core/dev.c:5755 [inline]
 __netif_receive_skb net/core/dev.c:5870 [inline]
 process_backlog+0x3e5/0xae0 net/core/dev.c:6206
 __napi_poll+0xd3/0x610 net/core/dev.c:6857
 napi_poll net/core/dev.c:6926 [inline]
 net_rx_action+0x584/0xce0 net/core/dev.c:7048
 handle_softirqs+0x1ab/0x630 kernel/softirq.c:621
 __do_softirq+0xf/0x16 kernel/softirq.c:659
 do_softirq+0xa6/0x100 kernel/softirq.c:503
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x74/0x80 kernel/softirq.c:430
 __raw_spin_unlock_bh include/linux/spinlock_api_smp.h:167 [inline]
 _raw_spin_unlock_bh+0x54/0x60 kernel/locking/spinlock.c:210
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 mld_query_work+0x951/0x2c10 net/ipv6/mcast.c:1529
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d5/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc58/0x1250 kernel/workqueue.c:3400
 kthread+0x2c7/0x370 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>