rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P30/2:b..l
rcu: (detected by 0, t=10502 jiffies, g=203029, q=599775 ncpus=2)
task:ksoftirqd/1 state:R running task stack:23752 pid:30 tgid:30 ppid:2 task_flags:0x4208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x1681/0x54c0 kernel/sched/core.c:7188
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7512
irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:547 [inline]
irqentry_exit+0x14f/0x730 kernel/entry/common.c:164
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:read_pnet include/net/net_namespace.h:419 [inline]
RIP: 0010:dev_net include/linux/netdevice.h:2764 [inline]
RIP: 0010:arp_process+0x60a/0x18a0 net/ipv4/arp.c:791
Code: 0f 48 8b 7c 24 10 e8 75 bd 8f f8 48 8b 44 24 10 41 bf 08 01 00 00 4c 03 38 e8 d2 35 80 01 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 <74> 08 4c 89 ff e8 4c bd 8f f8 41 bc 50 09 00 00 4d 03 27 4c 89 e0
RSP: 0018:ffffc90000a4f180 EFLAGS: 00000246
RAX: 1ffff11005074021 RBX: 1ffff92000149e3c RCX: ffff88801daa1ec0
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 00000000000000e0
RBP: ffffc90000a4f270 R08: 0000000000000000 R09: 0000000000000100
R10: dffffc0000000000 R11: fffff52000149e42 R12: dffffc0000000000
R13: ffff8880283a0000 R14: ffff888038ac3456 R15: ffff8880283a0108
NF_HOOK+0x33a/0x3c0 include/linux/netfilter.h:-1
__netif_receive_skb_list_ptype net/core/dev.c:6250 [inline]
__netif_receive_skb_list_core+0x765/0x810 net/core/dev.c:6292
__netif_receive_skb_list net/core/dev.c:6344 [inline]
netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6435
gro_normal_list include/net/gro.h:523 [inline]
gro_normal_one include/net/gro.h:543 [inline]
gro_skb_finish net/core/gro.c:603 [inline]
gro_receive_skb+0x5ae/0xbf0 net/core/gro.c:633
receive_buf+0x1010/0x1c80 drivers/net/virtio_net.c:2590
virtnet_receive_packets drivers/net/virtio_net.c:2900 [inline]
virtnet_receive drivers/net/virtio_net.c:2924 [inline]
virtnet_poll+0x2201/0x3060 drivers/net/virtio_net.c:3013
__napi_poll+0xab/0x550 net/core/dev.c:7730
napi_poll net/core/dev.c:7793 [inline]
net_rx_action+0x696/0xe00 net/core/dev.c:7950
handle_softirqs+0x1de/0x6d0 kernel/softirq.c:622
run_ksoftirqd+0x52/0x180 kernel/softirq.c:1076
smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: rcu_preempt kthread timer wakeup didn't happen for 252 jiffies! g203029 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: Possible timer handling issue on cpu=0 timer-softirq=137266
rcu: rcu_preempt kthread starved for 253 jiffies! g203029 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
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:I stack:24504 pid:18 tgid:18 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5387 [inline]
__schedule+0x1681/0x54c0 kernel/sched/core.c:7188
__schedule_loop kernel/sched/core.c:7267 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7282
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+0x514/0xb70 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:
CPU: 0 UID: 0 PID: 4963 Comm: udevd Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:seqcount_lockdep_reader_access+0xec/0x100 include/linux/seqlock.h:76
Code: 00 75 11 e8 36 6e 85 ff 4d 85 ff 75 16 e8 2c 6e 85 ff eb 15 e8 25 6e 85 ff e8 90 ea dc 08 4d 85 ff 74 ea e8 16 6e 85 ff fb 5b <41> 5e 41 5f c3 cc cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 90 90
RSP: 0018:ffffc90003a37d38 EFLAGS: 00000293
RAX: ffffffff823efaaa RBX: ffffc90003a37e40 RCX: ffff888038a5bd80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f11a1f R12: ffff8880339aa528
R13: ffffffff81000130 R14: ffffffff823f986f R15: 0000000000000200
FS: 00007fb82dec5880(0000) GS:ffff88812617d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1741cd4488 CR3: 0000000039222000 CR4: 00000000003526f0
Call Trace:
read_seqbegin include/linux/seqlock.h:838 [inline]
d_lookup+0x1f/0xc0 fs/dcache.c:2460
lookup_dcache fs/namei.c:1763 [inline]
lookup_one_qstr_excl+0x30/0x360 fs/namei.c:1792
__start_dirop fs/namei.c:2916 [inline]
start_dirop fs/namei.c:2938 [inline]
filename_unlinkat+0x2c0/0x610 fs/namei.c:5549
__do_sys_unlink fs/namei.c:5603 [inline]
__se_sys_unlink+0x2e/0x140 fs/namei.c:5600
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb82e021937
Code: 00 00 e9 a9 fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 5f 00 00 00 0f 05 c3 0f 1f 84 00 00 00 00 00 b8 57 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 91 b4 0d 00 f7 d8 64 89 02 b8
RSP: 002b:00007fffe5d3e5f8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fb82e021937
RDX: 0000000000000000 RSI: 000000009113e480 RDI: 000055c6f934202e
RBP: 0000000000000000 R08: 000000009119d7b5 R09: 3fffffffffffffff
R10: 4000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 000055c6f935d100 R14: 0000000000000001 R15: 0000000000000000