INFO: task syz.0.1133:4027 blocked for more than 138 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1133 state:D stack:0 pid:4027 tgid:4015 ppid:297 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:6026 [inline]
__schedule+0x14ce/0x2100 kernel/sched/core.c:7893
__schedule_loop kernel/sched/core.c:7974 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7989
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:10900
rtnl_unlock+0x12/0x20 net/core/rtnetlink.c:152
ppp_release+0xf5/0x200 drivers/net/ppp/ppp_generic.c:423
__fput+0x1fe/0xa00 fs/file_table.c:429
____fput+0x20/0x30 fs/file_table.c:457
task_work_run+0x1e5/0x260 kernel/task_work.c:246
exit_task_work include/linux/task_work.h:43 [inline]
do_exit+0x9ad/0x2720 kernel/exit.c:954
do_group_exit+0x229/0x2f0 kernel/exit.c:1096
get_signal+0x1398/0x14e0 kernel/signal.c:2933
arch_do_signal_or_restart+0xbc/0x760 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [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+0x57/0xb0 kernel/entry/common.c:218
do_syscall_64+0x63/0xf0 arch/x86/entry/common.c:84
entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f9ca259ce59
RSP: 002b:00007f9ca34720e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f9ca2816098 RCX: 00007f9ca259ce59
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f9ca2816098
RBP: 00007f9ca2816090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9ca2816128 R14: 00007ffc7f369630 R15: 00007ffc7f369718
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 8a9cd2cbe126bd9938f6e7ac5eb01541012e42ba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 4064 Comm: syz-executor Not tainted syzkaller #0 8a9cd2cbe126bd9938f6e7ac5eb01541012e42ba
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:memset_orig+0x46/0xb0 arch/x86/lib/memset_64.S:72
Code: 41 83 e1 07 75 70 48 89 d1 48 c1 e9 06 74 35 0f 1f 44 00 00 48 ff c9 48 89 07 48 89 47 08 48 89 47 10 48 89 47 18 48 89 47 20 <48> 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d8 0f 1f 84 00
RSP: 0018:ffffc900106b7318 EFLAGS: 00000206
RAX: ffffffffffffffff RBX: ffffea0006909f40 RCX: 0000000000000006
RDX: 0000000000000200 RSI: 00000000000000ff RDI: ffffed103484fa40
RBP: ffffc900106b7320 R08: dffffc0000000000 R09: 0000000000000000
R10: ffffed103484fa00 R11: ffffed1021874bbc R12: 0000000000000001
R13: 0000000000000000 R14: 1ffff920020d6e70 R15: dffffc0000000000
FS: 0000555563fa7500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5e8c6324aa CR3: 000000015ec20000 CR4: 00000000003526b0
Call Trace:
__kasan_poison_pages+0x31/0x40 mm/kasan/common.c:143
kasan_poison_pages include/linux/kasan.h:118 [inline]
free_pages_prepare mm/page_alloc.c:1413 [inline]
free_unref_page+0x354/0xf80 mm/page_alloc.c:2876
__free_pages+0x6b/0x3b0 mm/page_alloc.c:5402
__free_slab+0xb5/0x110 mm/slub.c:2758
free_slab+0x18/0xe0 mm/slub.c:2781
discard_slab+0x23/0x40 mm/slub.c:2787
__slab_free+0x1fd/0x2a0 mm/slub.c:4625
do_slab_free mm/slub.c:4666 [inline]
___cache_free+0xc9/0xe0 mm/slub.c:4781
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0xb5/0x130 mm/kasan/quarantine.c:179
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
__kernfs_new_node+0xf1/0x740 fs/kernfs/dir.c:628
kernfs_new_node+0x154/0x280 fs/kernfs/dir.c:704
kernfs_create_dir_ns+0x4b/0x130 fs/kernfs/dir.c:1065
sysfs_create_dir_ns+0x127/0x210 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x71b/0xc30 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_init_and_add+0x12c/0x1a0 lib/kobject.c:457
rx_queue_add_kobject net/core/net-sysfs.c:1105 [inline]
net_rx_queue_update_kobjects+0x1f5/0x5a0 net/core/net-sysfs.c:1160
register_queue_kobjects net/core/net-sysfs.c:1894 [inline]
netdev_register_kobject+0x26d/0x360 net/core/net-sysfs.c:2139
register_netdevice+0xf92/0x19d0 net/core/dev.c:10609
tun_set_iff+0x83a/0xee0 drivers/net/tun.c:2865
__tun_chr_ioctl+0x861/0x1f60 drivers/net/tun.c:3134
tun_chr_ioctl+0x2e/0x40 drivers/net/tun.c:3421
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl+0x132/0x1b0 fs/ioctl.c:893
__x64_sys_ioctl+0x7f/0xa0 fs/ioctl.c:893
x64_sys_call+0x1878/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:17
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: 0033:0x7f16c619caeb
Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
RSP: 002b:00007fff6f164b60 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fff6f164c10 RCX: 00007f16c619caeb
RDX: 00007fff6f164be0 RSI: 00000000400454ca RDI: 00000000000000c8
RBP: 00007f16c62336b1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 00007fff6f164f08 R15: 0000000000000000
net_ratelimit: 117414 callbacks suppressed
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:1b, vlan:0)
bridge0: received packet on veth0_to_bridge with own address as source address (addr:06:c1:83:a8:79:6b, 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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, 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:1b, vlan:0)
bridge0: received packet on bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, vlan:0)
net_ratelimit: 124402 callbacks suppressed
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 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:1b, 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: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 bridge_slave_0 with own address as source address (addr:aa:aa:aa:aa:aa:1b, 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)