INFO: task kworker/u8:4:330 blocked for more than 123 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:330 tgid:330 ppid:2 flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
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
default_device_exit_batch+0x82d/0x8c0 net/core/dev.c:12041
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x747/0xc90 net/core/net_namespace.c:642
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
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
__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
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 3978 Comm: syz-executor Not tainted syzkaller #0 e74179280c147a83e3a201a5967fe5af4e04851c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:140 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:145 [inline]
RIP: 0010:qlist_free_all+0x8b/0x130 mm/kasan/quarantine.c:179
Code: 48 8b 4c 18 08 f6 c1 01 75 55 48 01 d8 0f b6 48 33 c1 e1 18 81 f9 00 00 00 f5 b9 00 00 00 00 48 0f 45 c1 4c 8b 60 08 4d 8b 2f <49> 63 84 24 ec 00 00 00 49 29 c7 4c 89 e7 4c 89 fe e8 8f e5 ff ff
RSP: 0018:ffffc900109071f8 EFLAGS: 00000246
RAX: ffffea0006377800 RBX: ffffea0000000000 RCX: 0000000000000000
RDX: 00000000000c0001 RSI: 0000000000000a06 RDI: ffff888104e56800
RBP: ffffc90010907228 R08: ffff88818dddf140 R09: 00000000000c0000
R10: ffff88818dddf640 R11: fffff52002120e18 R12: ffff888104e55780
R13: ffff88818dde0780 R14: 0000000000000000 R15: ffff88818dde03c0
FS: 0000000000000000(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb3f614a9e0 CR3: 000000018b4a8000 CR4: 00000000003526b0
DR0: 00000000e0006acd DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
kasan_quarantine_reduce+0x14f/0x180 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x28/0x90 mm/kasan/common.c:331
kasan_slab_alloc include/linux/kasan.h:251 [inline]
slab_post_alloc_hook mm/slub.c:4202 [inline]
slab_alloc_node mm/slub.c:4251 [inline]
kmem_cache_alloc_noprof+0x1bf/0x410 mm/slub.c:4260
mt_alloc_one lib/maple_tree.c:164 [inline]
mas_alloc_nodes+0x254/0x9d0 lib/maple_tree.c:1243
mas_node_count_gfp lib/maple_tree.c:1323 [inline]
mas_preallocate+0x783/0xcb0 lib/maple_tree.c:5551
vma_iter_prealloc mm/vma.h:446 [inline]
vma_shrink+0x2d9/0x6f0 mm/vma.c:1081
relocate_vma_down+0x478/0x530 mm/mmap.c:2425
setup_arg_pages+0x725/0xcf0 fs/exec.c:812
load_elf_binary+0xa06/0x2b80 fs/binfmt_elf.c:1012
search_binary_handler fs/exec.c:1790 [inline]
exec_binprm fs/exec.c:1832 [inline]
bprm_execve+0x6f9/0x1390 fs/exec.c:1884
do_execveat_common+0x928/0xa80 fs/exec.c:1989
do_execve fs/exec.c:2063 [inline]
__do_sys_execve fs/exec.c:2139 [inline]
__se_sys_execve fs/exec.c:2134 [inline]
__x64_sys_execve+0x96/0xb0 fs/exec.c:2134
x64_sys_call+0x12c4/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:60
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: 0033:0x7f47847c5197
Code: Unable to access opcode bytes at 0x7f47847c516d.
RSP: 002b:00007f4785600de8 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007ffdb604fef3 RCX: 00007f47847c5197
RDX: 00007ffdb604df90 RSI: 00007ffdb604e1d0 RDI: 00007ffdb604fef3
RBP: 00007f4785600e60 R08: 00007ffdb604dd60 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 00007ffdb604e1d0
R13: 00007ffdb604df90 R14: 0000000000000000 R15: 0000000000000000
net_ratelimit: 129433 callbacks suppressed
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:1c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:56:0a:24:39:4a:78, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:56:0a:24:39:4a:78, vlan:0)
bridge0: received packet on veth1_to_bridge with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)
bridge0: received packet on bridge_slave_1 with own address as source address (addr:aa:aa:aa:aa:aa:0c, vlan:0)