INFO: task pool_workqueue_:3 blocked for more than 40 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:pool_workqueue_ state:D stack:28024 pid:3 tgid:3 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x11f6/0x6500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121
synchronize_rcu_normal+0x230/0x260 kernel/rcu/tree.c:3333
synchronize_rcu_expedited+0x3cd/0x450 kernel/rcu/tree_exp.h:955
wq_unregister_lockdep kernel/workqueue.c:4949 [inline]
pwq_release_workfn+0x618/0xb30 kernel/workqueue.c:5245
kthread_worker_fn+0x300/0xbe0 kernel/kthread.c:1025
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/1:0:31 blocked for more than 40 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/1:0 state:D stack:23320 pid:31 tgid:31 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient crda_timeout_work
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x11f6/0x6500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
rt_mutex_schedule+0x96/0xe0 kernel/sched/core.c:7607
rt_mutex_slowlock_block.constprop.0+0x366/0x7c0 kernel/locking/rtmutex.c:1670
__rt_mutex_slowlock kernel/locking/rtmutex.c:1747 [inline]
__rt_mutex_slowlock_locked.constprop.0+0x1cc/0x760 kernel/locking/rtmutex.c:1787
rt_mutex_slowlock.constprop.0+0x8d/0x120 kernel/locking/rtmutex.c:1827
__rt_mutex_lock kernel/locking/rtmutex.c:1842 [inline]
__mutex_lock_common kernel/locking/rtmutex_api.c:560 [inline]
mutex_lock_nested+0xd6/0x110 kernel/locking/rtmutex_api.c:578
crda_timeout_work+0x16/0x70 net/wireless/reg.c:529
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task kworker/u8:7:167 blocked for more than 40 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:7 state:D stack:22608 pid:167 tgid:167 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: netns cleanup_net
Call Trace:
context_switch kernel/sched/core.c:5510 [inline]
__schedule+0x11f6/0x6500 kernel/sched/core.c:7234
__schedule_loop kernel/sched/core.c:7311 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7326
schedule_timeout+0x1b2/0x280 kernel/time/sleep_timeout.c:75
do_wait_for_common kernel/sched/completion.c:100 [inline]
__wait_for_common+0x2e7/0x4c0 kernel/sched/completion.c:121
synchronize_rcu_normal+0x230/0x260 kernel/rcu/tree.c:3333
synchronize_rcu_expedited+0x3cd/0x450 kernel/rcu/tree_exp.h:955
synchronize_net net/core/dev.c:12276 [inline]
dev_remove_pack+0x7a/0xb0 net/core/dev.c:689
tipc_detach_loopback+0x5b/0x110 net/tipc/bearer.c:819
tipc_exit_net+0x8b/0x260 net/tipc/core.c:112
ops_exit_list net/core/net_namespace.c:199 [inline]
ops_undo_list+0x2ee/0xab0 net/core/net_namespace.c:252
cleanup_net+0x49c/0x920 net/core/net_namespace.c:702
process_one_work+0xa23/0x1940 kernel/workqueue.c:3322
process_scheduled_works kernel/workqueue.c:3405 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3486
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0[ 163.797520][ T38] ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Showing all locks held in the system:
4 locks held by ktimers/0/16:
3 locks held by pr/legacy/17:
2 locks held by rcu_preempt/18:
3 locks held by kworker/1:0/31:
#0: ffff88813fe3e538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
#1: ffffc90000a5fd08 ((crda_timeout).work){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
#2: ffffffff8fd25398 (rtnl_mutex){+.+.}-{4:4}, at: crda_timeout_work+0x16/0x70 net/wireless/reg.c:529
1 lock held by khungtaskd/38:
#0: ffffffff8e04e740 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e04e740 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline]
#0: ffffffff8e04e740 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6775
2 locks held by kcompactd0/41:
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool lib/debugobjects.c:779 [inline]
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool+0x223/0x660 lib/debugobjects.c:758
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: get_from_partial_node+0x149/0x4e0 mm/slub.c:3817
2 locks held by kcompactd1/42:
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool lib/debugobjects.c:779 [inline]
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool+0x223/0x660 lib/debugobjects.c:758
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: get_from_partial_node+0x149/0x4e0 mm/slub.c:3817
7 locks held by kworker/u8:4/66:
2 locks held by kworker/0:1H/102:
7 locks held by kworker/u8:5/122:
3 locks held by kworker/u8:7/167:
#0: ffff88801bae0938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12b1/0x1940 kernel/workqueue.c:3297
#1: ffffc900038ffd08 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x988/0x1940 kernel/workqueue.c:3298
#2: ffffffff8fd0cc60 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xb8/0x920 net/core/net_namespace.c:673
2 locks held by dhcpcd/5248:
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool lib/debugobjects.c:779 [inline]
#0: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool+0x223/0x660 lib/debugobjects.c:758
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#1: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: get_from_partial_node+0x149/0x4e0 mm/slub.c:3817
2 locks held by getty/5341:
#0: ffff8880384d30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x424/0x14f0 drivers/tty/n_tty.c:2211
4 locks held by udevd/5614:
3 locks held by kworker/1:4/5645:
1 lock held by syz-executor663/5977:
2 locks held by syz-executor663/6203:
2 locks held by syz-executor663/6205:
2 locks held by syz-executor663/6207:
#0: ffffffff8fd0cc60 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x451/0x7c0 net/core/net_namespace.c:575
#1: ffffffff8fd25398 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x21e/0x780 net/ipv4/ip_tunnel.c:1149
2 locks held by syz-executor663/6209:
1 lock held by dhcpcd/6211:
#0: ffff88803e628358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803e628358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6212:
#0: ffff88803b75e358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803b75e358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6213:
#0: ffff88803c2bc358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803c2bc358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
3 locks held by dhcpcd/6214:
#0: ffff88802eceacb0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_downgrade include/linux/mmap_lock.h:586 [inline]
#0: ffff88802eceacb0 (&mm->mmap_lock){++++}-{4:4}, at: vms_complete_munmap_vmas+0x946/0xdd0 mm/vma.c:1340
#1: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool lib/debugobjects.c:779 [inline]
#1: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool+0x223/0x660 lib/debugobjects.c:758
#2: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#2: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: get_from_partial_node+0x149/0x4e0 mm/slub.c:3817
1 lock held by dhcpcd/6215:
#0: ffff88803c2b8358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803c2b8358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6216:
#0: ffff88803c2be358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803c2be358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6217:
#0: ffff88803b534358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803b534358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6218:
#0: ffff88803b4a8358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803b4a8358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
1 lock held by dhcpcd/6219:
#0: ffff88803b4aa358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
#0: ffff88803b4aa358 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf50 net/packet/af_packet.c:3226
3 locks held by dhcpcd/6220:
#0: ffff888032b6acb0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#0: ffff888032b6acb0 (&mm->mmap_lock){++++}-{4:4}, at: __vm_munmap+0x10f/0x390 mm/vma.c:3285
#1: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool lib/debugobjects.c:779 [inline]
#1: ffffffff8ebe21a0 (fill_pool_map-wait-type-override){+.+.}-{3:3}, at: debug_objects_fill_pool+0x223/0x660 lib/debugobjects.c:758
#2: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline]
#2: ffff88813fe20758 (&n->list_lock){+.+.}-{3:3}, at: get_from_partial_node+0x149/0x4e0 mm/slub.c:3817
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:122
nmi_trigger_cpumask_backtrace+0x21c/0x2a0 lib/nmi_backtrace.c:65
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x370/0x450 kernel/kthread.c:436
ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5977 Comm: syz-executor663 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x2e/0xa0 kernel/kcov.c:246
Code: 89 cf 49 89 d2 65 8b 15 20 a2 53 11 65 48 8b 0d 00 a2 53 11 49 89 f1 81 e2 00 00 ff 00 8b 81 f4 0b 00 00 89 d6 25 00 01 00 00 <09> c6 74 17 85 c0 74 04 85 d2 74 05 c3 cc cc cc cc 8b 81 f4 16 00
RSP: 0018:ffffc900038cf6e0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88803870d200 RCX: ffff888027d98000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8b0988ac
RBP: 000000000000000b R08: 0000000000000000 R09: 0000000000000007
R10: 000000000000000b R11: 0000000000000000 R12: ffff888041231b40
R13: 0000000000000007 R14: 0000000000000001 R15: 0000000000000000
FS: 000055556f5b4400(0000) GS:ffff888125097000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2474af7d3c CR3: 000000003d734000 CR4: 00000000003506f0
Call Trace:
mt_validate_nulls+0x48c/0xa20 lib/maple_tree.c:6908
mt_validate+0x188d/0x3220 lib/maple_tree.c:6956
validate_mm+0xa8/0x4e0 mm/vma.c:652
mmap_region+0x38d/0x620 mm/vma.c:2866
do_mmap+0xc74/0x1300 mm/mmap.c:560
vm_mmap_pgoff+0x2a4/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3d1/0x620 mm/mmap.c:606
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x10b/0x830 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2474a89122
Code: 00 00 00 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 3b 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 6e 5b 5d c3 0f 1f 00 48 c7 c0 d0 ff ff ff 64
RSP: 002b:00007ffc98fd5ca8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 0000001b2e964000 RCX: 00007f2474a89122
RDX: 0000000000000003 RSI: 00000000005c0000 RDI: 0000001b2e964000
RBP: 0000000000100001 R08: 0000000000000003 R09: 0000000000040000
R10: 0000000000100001 R11: 0000000000000206 R12: 00007ffc98fd5cc0
R13: 0000000000000002 R14: 00007f2474b27560 R15: 0000000000000002