INFO: task kworker/u8:2:46 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:2    state:D stack:0     pid:46    tgid:46    ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5996 [inline]
 __schedule+0x134f/0x1ea0 kernel/sched/core.c:7843
 __schedule_loop kernel/sched/core.c:7924 [inline]
 schedule+0xc5/0x240 kernel/sched/core.c:7939
 schedule_timeout+0xc7/0x3b0 kernel/time/timer.c:2596
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common kernel/sched/completion.c:116 [inline]
 wait_for_common+0x369/0x650 kernel/sched/completion.c:127
 wait_for_completion+0x1c/0x40 kernel/sched/completion.c:148
 rcu_barrier+0x415/0x540 kernel/rcu/tree.c:4657
 netdev_run_todo+0x118/0xce0 net/core/dev.c:10874
 rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
 cleanup_net+0x648/0xc90 net/core/net_namespace.c:638
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0x7d4/0x1020 kernel/workqueue.c:3319
 worker_thread+0xc70/0x10b0 kernel/workqueue.c:3400
 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>
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 a14c28d9e62c02dc866229d1d178db2aa7df2752
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6706 Comm: syz-executor Not tainted syzkaller #0 a14c28d9e62c02dc866229d1d178db2aa7df2752
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:PageBuddy include/linux/page-flags.h:1031 [inline]
RIP: 0010:__SetPageBuddy include/linux/page-flags.h:1031 [inline]
RIP: 0010:set_buddy_order mm/page_alloc.c:707 [inline]
RIP: 0010:expand mm/page_alloc.c:1678 [inline]
RIP: 0010:page_del_and_expand mm/page_alloc.c:1692 [inline]
RIP: 0010:__rmqueue_smallest mm/page_alloc.c:1880 [inline]
RIP: 0010:__rmqueue mm/page_alloc.c:2433 [inline]
RIP: 0010:rmqueue_bulk mm/page_alloc.c:2492 [inline]
RIP: 0010:___rmqueue_pcplist+0x130c/0x31b0 mm/page_alloc.c:3225
Code: 24 2c 74 05 e8 e5 a8 05 00 48 8b 44 24 40 48 89 43 28 48 83 c3 30 49 89 de 49 c1 ee 03 43 0f b6 04 2e 84 c0 75 78 0f b6 43 03 <c1> e0 18 3d 00 00 00 f0 48 8b 74 24 58 0f 84 55 fe ff ff 43 0f b6
RSP: 0000:ffffc90016bdf320 EFLAGS: 00000046
RAX: 00000000000000ff RBX: ffffea00054c9ab0 RCX: ffffea00054c9a88
RDX: ffffffff87e37f38 RSI: ffffffff87e37f38 RDI: ffffea00054c9aa8
RBP: ffffc90016bdf590 R08: ffffffff87e37ff0 R09: ffffffff87e37ff0
R10: dffffc0000000000 R11: fffffbfff0ed5431 R12: ffffffff87e37f38
R13: dffffc0000000000 R14: 1ffffd4000a99356 R15: 0000000000000001
FS:  0000555577d1e500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f588d5b2ff8 CR3: 0000000110266000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 __rmqueue_pcplist mm/page_alloc.c:3264 [inline]
 rmqueue_pcplist mm/page_alloc.c:3293 [inline]
 rmqueue mm/page_alloc.c:3326 [inline]
 get_page_from_freelist+0x6f5/0x4a20 mm/page_alloc.c:3912
 __alloc_pages_noprof+0x35f/0x7e0 mm/page_alloc.c:5265
 __folio_alloc_noprof+0x14/0x80 mm/page_alloc.c:5298
 __folio_alloc_node_noprof include/linux/gfp.h:280 [inline]
 folio_alloc_noprof include/linux/gfp.h:322 [inline]
 folio_prealloc+0x46/0x220 mm/memory.c:-1
 alloc_anon_folio mm/memory.c:4771 [inline]
 do_anonymous_page mm/memory.c:4828 [inline]
 do_pte_missing+0x1e80/0x44f0 mm/memory.c:3994
 handle_pte_fault mm/memory.c:5848 [inline]
 __handle_mm_fault mm/memory.c:5991 [inline]
 handle_mm_fault+0x11b8/0x1bf0 mm/memory.c:6159
 do_user_addr_fault+0x963/0x11e0 arch/x86/mm/fault.c:1338
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f588c79cd96
Code: 0f 1f 40 00 b8 ea ff ff ff 48 85 ff 74 28 48 85 d2 74 23 49 89 c8 b8 b3 01 00 00 0f 05 48 85 c0 7c 14 74 01 c3 31 ed 4c 89 c7 <ff> d2 48 89 c7 b8 3c 00 00 00 0f 05 48 c7 c1 e8 ff ff ff f7 d8 64
RSP: 002b:00007f588d5b3000 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000009000 RCX: 00007f588c79cd89
RDX: 00007f588c7997b0 RSI: 0000000000000058 RDI: 00007ffcd7150d60
RBP: 0000000000000000 R08: 00007ffcd7150d60 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 00007ffcd7150d60
R13: 0000000000000000 R14: 00007ffcd7150d00 R15: 00007ffcd71511d0
 </TASK>
net_ratelimit: 46990 callbacks suppressed
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:fa:e3:7f:57:d6:f1, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)