[v5.15] INFO: task hung in netdev_run_todo (4)
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syzbot
1:07 AM (3 hours ago) 1:07 AM
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Hello,
syzbot found the following issue on:
HEAD commit: aabd761612db Linux 5.15.215
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=165286c6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=2271061f8b8e1bc1195e
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f636f56d3662/disk-aabd7616.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1a46620f40c/vmlinux-aabd7616.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9b78bb48b022/bzImage-aabd7616.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+227106...@syzkaller.appspotmail.com
INFO: task syz-executor:4189 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:19840 pid: 4189 ppid: 1 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
__mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
tun_detach drivers/net/tun.c:705 [inline]
tun_chr_close+0x13b/0x1b0 drivers/net/tun.c:3443
__fput+0x212/0x8c0 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x635/0x2110 kernel/exit.c:890
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
get_signal+0x7eb/0x12e0 kernel/signal.c:2909
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f112b92390e
RSP: 002b:00007ffcd570ec18 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 000055555c7c0500 RCX: 00007f112b92390e
RDX: 0000000000000030 RSI: 00007ffcd570ed10 RDI: 00000000000000f9
RBP: 00007ffcd570ecbc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000088
R13: 000000000000003f R14: 0000000000020052 R15: 00007ffcd570ed10
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/1:2/2238:
#0: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
#1: ffff8880b9127888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x517/0x810 kernel/sched/psi.c:891
1 lock held by jbd2/sda1-8/3519:
#0: ffffffff8c3affa8 (oom_lock){+.+.}-{3:3}, at: __alloc_pages_may_oom mm/page_alloc.c:4308 [inline]
#0: ffffffff8c3affa8 (oom_lock){+.+.}-{3:3}, at: __alloc_pages_slowpath+0x1bad/0x2700 mm/page_alloc.c:5177
2 locks held by klogd/3546:
#0: ffff88802c6c7128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c6c7128 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by udevd/3557:
#0: ffff88807df44e28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807df44e28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by crond/3924:
#0: ffff88802c6c0f28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c6c0f28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by getty/3946:
#0: ffff88802cccc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002d032e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz-executor/4172:
#0: ffff8880734b8278 (&ei->i_data_sem){++++}-{3:3}, at: ext4_release_file+0x15d/0x310 fs/ext4/file.c:148
1 lock held by syz-executor/4189:
#0: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
3 locks held by kworker/1:7/4257:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc900031dfd00 ((work_completion)(&(&vi->refill)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
3 locks held by kworker/1:8/4269:
#0: ffff88814c59cd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000322fd00 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4664
5 locks held by kworker/u4:8/4388:
#0: ffff888016dcd938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc900031afd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d441550 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:589
#3: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: xfrmi_exit_batch_net+0xb7/0x280 net/xfrm/xfrm_interface_core.c:799
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
3 locks held by kworker/0:9/5128:
#0: ffff888016c71938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000316fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x82/0xa90 net/wireless/reg.c:2437
2 locks held by syz.0.453/5825:
#0: ffff8880799f2120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
#0: ffff8880799f2120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_setsockopt+0x7f3/0x1af0 net/packet/af_packet.c:3835
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by dhcpcd-run-hook/6122:
#0: ffff88802442a428 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802442a428 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
1 lock held by syz-executor/6163:
#0: ffff888024d77128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d77128 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
2 locks held by syz.6.542/6166:
#0: ffff888075b7ad70 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:842 [inline]
#0: ffff888075b7ad70 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x83f/0x13a0 mm/filemap.c:3096
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
4 locks held by syz-executor/6171:
#0: ffff888024d76328 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d76328 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
#2: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
#3: ffff8880b9027888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c3/0x810 kernel/sched/psi.c:882
2 locks held by syz-executor/6173:
#0: ffff88807df44728 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807df44728 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
2 locks held by syz-executor/6174:
#0: ffff888024d72b28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d72b28 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4174 Comm: kworker/0:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x5e/0x290 mm/kasan/generic.c:189
Code: bc 01 00 00 00 00 fc ff df 49 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 <4b> 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38
RSP: 0018:ffffc90002def3c0 EFLAGS: 00000a03
RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffffffff81b43581
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88813fffbd40
RBP: 0000000000000830 R08: ffff88813fffbd47 R09: 1ffff11027fff7a8
R10: dffffc0000000000 R11: ffffed1027fff7a8 R12: dffffc0000000001
R13: 0000000000000000 R14: 1ffff11027fff7a8 R15: ffff88813fffbd40
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24c1a70ae8 CR3: 000000006aec6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline]
zone_page_state include/linux/vmstat.h:210 [inline]
zone_watermark_fast+0x41/0x230 mm/page_alloc.c:3957
get_page_from_freelist+0x42f/0x2670 mm/page_alloc.c:4146
__alloc_pages_slowpath+0xf5b/0x2700 mm/page_alloc.c:5115
__alloc_pages+0x340/0x480 mm/page_alloc.c:5514
allocate_slab mm/slub.c:1925 [inline]
new_slab+0x2dc/0x4b0 mm/slub.c:1980
___slab_alloc+0x807/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
kmem_cache_alloc_node+0x118/0x2c0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline]
nsim_dev_trap_report_work+0x25c/0xab0 drivers/net/netdevsim/dev.c:762
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
---
This report is generated by a bot. It may contain errors.
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syzbot found the following issue on:
HEAD commit: aabd761612db Linux 5.15.215
git tree: linux-5.15.y
console output: https://syzkaller.appspot.com/x/log.txt?x=165286c6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=f161cbc9aef65db0
dashboard link: https://syzkaller.appspot.com/bug?extid=2271061f8b8e1bc1195e
compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f636f56d3662/disk-aabd7616.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f1a46620f40c/vmlinux-aabd7616.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9b78bb48b022/bzImage-aabd7616.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+227106...@syzkaller.appspotmail.com
INFO: task syz-executor:4189 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:19840 pid: 4189 ppid: 1 flags:0x00004006
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5049 [inline]
__schedule+0x11c3/0x4350 kernel/sched/core.c:6395
schedule+0x11b/0x1e0 kernel/sched/core.c:6478
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
__mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
tun_detach drivers/net/tun.c:705 [inline]
tun_chr_close+0x13b/0x1b0 drivers/net/tun.c:3443
__fput+0x212/0x8c0 fs/file_table.c:311
task_work_run+0x125/0x1a0 kernel/task_work.c:188
exit_task_work include/linux/task_work.h:33 [inline]
do_exit+0x635/0x2110 kernel/exit.c:890
do_group_exit+0x12c/0x2f0 kernel/exit.c:1004
get_signal+0x7eb/0x12e0 kernel/signal.c:2909
arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
handle_signal_work kernel/entry/common.c:154 [inline]
exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:178
exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:214
__syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f112b92390e
RSP: 002b:00007ffcd570ec18 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: fffffffffffffe00 RBX: 000055555c7c0500 RCX: 00007f112b92390e
RDX: 0000000000000030 RSI: 00007ffcd570ed10 RDI: 00000000000000f9
RBP: 00007ffcd570ecbc R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000088
R13: 000000000000003f R14: 0000000000020052 R15: 00007ffcd570ed10
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c31ef60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by kworker/1:2/2238:
#0: ffff8880b913a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
#1: ffff8880b9127888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x517/0x810 kernel/sched/psi.c:891
1 lock held by jbd2/sda1-8/3519:
#0: ffffffff8c3affa8 (oom_lock){+.+.}-{3:3}, at: __alloc_pages_may_oom mm/page_alloc.c:4308 [inline]
#0: ffffffff8c3affa8 (oom_lock){+.+.}-{3:3}, at: __alloc_pages_slowpath+0x1bad/0x2700 mm/page_alloc.c:5177
2 locks held by klogd/3546:
#0: ffff88802c6c7128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c6c7128 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by udevd/3557:
#0: ffff88807df44e28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807df44e28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by crond/3924:
#0: ffff88802c6c0f28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802c6c0f28 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by getty/3946:
#0: ffff88802cccc098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc90002d032e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x594/0x1a50 drivers/tty/n_tty.c:2158
1 lock held by syz-executor/4172:
#0: ffff8880734b8278 (&ei->i_data_sem){++++}-{3:3}, at: ext4_release_file+0x15d/0x310 fs/ext4/file.c:148
1 lock held by syz-executor/4189:
#0: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: netdev_run_todo+0x8dd/0xac0 net/core/dev.c:10722
3 locks held by kworker/1:7/4257:
#0: ffff888016c70938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc900031dfd00 ((work_completion)(&(&vi->refill)->work)){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#2: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
3 locks held by kworker/1:8/4269:
#0: ffff88814c59cd38 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000322fd00 ((addr_chk_work).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4664
5 locks held by kworker/u4:8/4388:
#0: ffff888016dcd938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc900031afd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d441550 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x148/0xba0 net/core/net_namespace.c:589
#3: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: xfrmi_exit_batch_net+0xb7/0x280 net/xfrm/xfrm_interface_core.c:799
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#4: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
3 locks held by kworker/0:9/5128:
#0: ffff888016c71938 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x75c/0xff0 kernel/workqueue.c:-1
#1: ffffc9000316fd00 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x79e/0xff0 kernel/workqueue.c:2285
#2: ffffffff8d44d488 (rtnl_mutex){+.+.}-{3:3}, at: reg_check_chans_work+0x82/0xa90 net/wireless/reg.c:2437
2 locks held by syz.0.453/5825:
#0: ffff8880799f2120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline]
#0: ffff8880799f2120 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_setsockopt+0x7f3/0x1af0 net/packet/af_packet.c:3835
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
2 locks held by dhcpcd-run-hook/6122:
#0: ffff88802442a428 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88802442a428 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
1 lock held by syz-executor/6163:
#0: ffff888024d77128 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d77128 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
2 locks held by syz.6.542/6166:
#0: ffff888075b7ad70 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:842 [inline]
#0: ffff888075b7ad70 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0x83f/0x13a0 mm/filemap.c:3096
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
4 locks held by syz-executor/6171:
#0: ffff888024d76328 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d76328 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
#2: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
#3: ffff8880b9027888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c3/0x810 kernel/sched/psi.c:882
2 locks held by syz-executor/6173:
#0: ffff88807df44728 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline]
#0: ffff88807df44728 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0x2bb/0xc90 arch/x86/mm/fault.c:1296
#1: ffff8880b903a358 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x25/0x130 kernel/sched/core.c:475
2 locks held by syz-executor/6174:
#0: ffff888024d72b28 (&mm->mmap_lock){++++}-{3:3}, at: mmap_write_lock_killable include/linux/mmap_lock.h:87 [inline]
#0: ffff888024d72b28 (&mm->mmap_lock){++++}-{3:3}, at: vm_mmap_pgoff+0x16c/0x2d0 mm/util.c:549
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4654 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim mm/page_alloc.c:4678 [inline]
#1: ffffffff8c3ded00 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_slowpath+0x1017/0x2700 mm/page_alloc.c:5128
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 27 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
<TASK>
dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe1b/0xe60 kernel/hung_task.c:369
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4174 Comm: kworker/0:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events nsim_dev_trap_report_work
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:101 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:128 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline]
RIP: 0010:kasan_check_range+0x5e/0x290 mm/kasan/generic.c:189
Code: bc 01 00 00 00 00 fc ff df 49 89 fe 49 c1 ee 03 49 ba 00 00 00 00 00 fc ff df 4f 8d 1c 16 4c 8d 44 3e ff 4d 89 c1 49 c1 e9 03 <4b> 8d 1c 21 49 89 df 4d 29 df 49 83 ff 10 7f 29 4d 85 ff 0f 84 38
RSP: 0018:ffffc90002def3c0 EFLAGS: 00000a03
RAX: 0000000000000001 RBX: 0000000000000002 RCX: ffffffff81b43581
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88813fffbd40
RBP: 0000000000000830 R08: ffff88813fffbd47 R09: 1ffff11027fff7a8
R10: dffffc0000000000 R11: ffffed1027fff7a8 R12: dffffc0000000001
R13: 0000000000000000 R14: 1ffff11027fff7a8 R15: ffff88813fffbd40
FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24c1a70ae8 CR3: 000000006aec6000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic_long_read include/linux/atomic/atomic-instrumented.h:1183 [inline]
zone_page_state include/linux/vmstat.h:210 [inline]
zone_watermark_fast+0x41/0x230 mm/page_alloc.c:3957
get_page_from_freelist+0x42f/0x2670 mm/page_alloc.c:4146
__alloc_pages_slowpath+0xf5b/0x2700 mm/page_alloc.c:5115
__alloc_pages+0x340/0x480 mm/page_alloc.c:5514
allocate_slab mm/slub.c:1925 [inline]
new_slab+0x2dc/0x4b0 mm/slub.c:1980
___slab_alloc+0x807/0xdd0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
kmem_cache_alloc_node+0x118/0x2c0 mm/slub.c:3261
__alloc_skb+0xf4/0x750 net/core/skbuff.c:415
alloc_skb include/linux/skbuff.h:1162 [inline]
nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:664 [inline]
nsim_dev_trap_report drivers/net/netdevsim/dev.c:721 [inline]
nsim_dev_trap_report_work+0x25c/0xab0 drivers/net/netdevsim/dev.c:762
process_one_work+0x867/0xff0 kernel/workqueue.c:2310
worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
kthread+0x42e/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
</TASK>
---
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