lec0: NETDEV WATCHDOG: CPU: 0: transmit queue 0 timed out 5370 ms
lec:lec_tx_timeout: lec0
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P7076/1:b..l
rcu: (detected by 0, t=10503 jiffies, g=221225, q=859060 ncpus=2)
task:syz-executor state:R running task stack:20496 pid:7076 tgid:7076 ppid:1 task_flags:0x40054c flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
preempt_schedule_common+0x82/0xd0 kernel/sched/core.c:7151
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__raw_spin_unlock include/linux/spinlock_api_smp.h:169 [inline]
_raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186
spin_unlock include/linux/spinlock.h:390 [inline]
zap_pte_range mm/memory.c:1946 [inline]
zap_pmd_range mm/memory.c:2002 [inline]
zap_pud_range mm/memory.c:2030 [inline]
zap_p4d_range mm/memory.c:2051 [inline]
unmap_page_range+0x3c17/0x4930 mm/memory.c:2072
unmap_single_vma mm/memory.c:2114 [inline]
unmap_vmas+0x48f/0x6a0 mm/memory.c:2152
exit_mmap+0x280/0xa10 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1179
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x8b9/0x2580 kernel/exit.c:962
do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
get_signal+0x1284/0x1330 kernel/signal.c:3032
arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:269 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb51b75cfce
RSP: 002b:00007ffe81acbc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e6
RAX: 0000000000000000 RBX: 00005555795e8500 RCX: 00007fb51b75cfce
RDX: 00007ffe81acbcc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffe81acbd2c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000021
R13: 0000000000000062 R14: 00000000001fc467 R15: 00007ffe81acbd80
rcu: rcu_preempt kthread starved for 10002 jiffies! g221225 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27552 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5354 [inline]
__schedule+0x1664/0x5590 kernel/sched/core.c:6966
__schedule_loop kernel/sched/core.c:7049 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7064
schedule_timeout+0x158/0x2c0 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x312/0x11d0 kernel/rcu/tree.c:2095
rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2297
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 04 02 56 0c 48 89 de 5b e9 83 90 5e 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d 28 92 57 11 65 8b 15 49 92 57 11 81 e2 00 01 ff 00 74
RSP: 0018:ffffc90000a07d48 EFLAGS: 00000202
RAX: ffffffff8a2ba5ad RBX: 0000000000000001 RCX: 0000000000000100
RDX: ffff88801def8000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8a0b24d6 R09: ffffffff8e760520
R10: ffffc90000a07f80 R11: fffff52000140ff6 R12: ffff88806bc51160
R13: 0000000000000005 R14: ffff88802b941e20 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff88812554c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555573f0c4e8 CR3: 00000000b3b64000 CR4: 00000000003526f0
Call Trace:
fib_table_lookup+0x2ed/0x16e0 net/ipv4/fib_trie.c:1479
fib_lookup+0x1c5/0x440 include/net/ip_fib.h:390
ip_route_output_key_hash_rcu+0x32e/0x25f0 net/ipv4/route.c:2814
ip_route_output_key_hash+0x18d/0x2a0 net/ipv4/route.c:2705
__ip_route_output_key include/net/route.h:169 [inline]
ip_route_output_flow+0x2a/0x150 net/ipv4/route.c:2932
ip_route_output_key include/net/route.h:179 [inline]
ip_route_me_harder+0x742/0xf90 net/ipv4/netfilter.c:53
synproxy_send_tcp+0x34c/0x670 net/netfilter/nf_synproxy_core.c:432
synproxy_send_client_synack+0x8c1/0xe30 net/netfilter/nf_synproxy_core.c:485
nft_synproxy_eval_v4+0x34a/0x4e0 net/netfilter/nft_synproxy.c:60
nft_synproxy_do_eval+0x305/0x580 net/netfilter/nft_synproxy.c:142
expr_call_ops_eval net/netfilter/nf_tables_core.c:237 [inline]
nft_do_chain+0x45e/0x1990 net/netfilter/nf_tables_core.c:285
nft_do_chain_inet+0x29d/0x380 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:158 [inline]
nf_hook_slow+0xc5/0x220 net/netfilter/core.c:623
nf_hook include/linux/netfilter.h:273 [inline]
NF_HOOK+0x21f/0x3c0 include/linux/netfilter.h:316
NF_HOOK+0x336/0x3c0 include/linux/netfilter.h:318
__netif_receive_skb_one_core net/core/dev.c:6168 [inline]
__netif_receive_skb net/core/dev.c:6281 [inline]
process_backlog+0xaa3/0x1950 net/core/dev.c:6632
__napi_poll+0xae/0x340 net/core/dev.c:7696
napi_poll net/core/dev.c:7759 [inline]
net_rx_action+0x627/0xf70 net/core/dev.c:7911
handle_softirqs+0x22a/0x870 kernel/softirq.c:626
__do_softirq kernel/softirq.c:660 [inline]
invoke_softirq kernel/softirq.c:496 [inline]
__irq_exit_rcu+0xca/0x220 kernel/softirq.c:739
irq_exit_rcu+0x9/0x30 kernel/softirq.c:756
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1061
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 9d 6b 02 e9 83 ec 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 4f 19 00 fb f4 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e20 EFLAGS: 00000242
RAX: 0000000005555ee9 RBX: ffffffff819ababd RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8df00ec2 RDI: ffffffff8c27eb60
RBP: ffffc90000197f10 R08: ffff8880b873399b R09: 1ffff110170e6733
R10: dffffc0000000000 R11: ffffed10170e6734 R12: ffffffff90121db0
R13: 1ffff11003bdf000 R14: 0000000000000001 R15: 0000000000000001
arch_safe_halt arch/x86/kernel/process.c:766 [inline]
default_idle+0x9/0x20 arch/x86/kernel/process.c:767
default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
cpuidle_idle_call kernel/sched/idle.c:191 [inline]
do_idle+0x1bd/0x500 kernel/sched/idle.c:332
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:430
start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
common_startup_64+0x13e/0x147