rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P18415 P36/2:b..l
rcu: (detected by 0, t=10503 jiffies, g=116401, q=520 ncpus=2)
task:kworker/u8:2 state:R running task stack:21144 pid:36 tgid:36 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: ipv6_addrconf addrconf_dad_work
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:7050
preempt_schedule+0xae/0xc0 kernel/sched/core.c:7074
preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12
__local_bh_enable_ip+0x13e/0x1c0 kernel/softirq.c:457
local_bh_enable include/linux/bottom_half.h:33 [inline]
rcu_read_unlock_bh include/linux/rcupdate.h:936 [inline]
__dev_queue_xmit+0x1955/0x3140 net/core/dev.c:4845
neigh_output include/net/neighbour.h:556 [inline]
ip6_finish_output2+0xfb3/0x1480 net/ipv6/ip6_output.c:136
NF_HOOK_COND include/linux/netfilter.h:307 [inline]
ip6_output+0x340/0x550 net/ipv6/ip6_output.c:247
NF_HOOK include/linux/netfilter.h:318 [inline]
ndisc_send_skb+0xbce/0x1510 net/ipv6/ndisc.c:512
ndisc_send_ns+0xcb/0x150 net/ipv6/ndisc.c:670
addrconf_dad_work+0xaae/0x14b0 net/ipv6/addrconf.c:4282
process_one_work+0x93a/0x15a0 kernel/workqueue.c:3279
process_scheduled_works kernel/workqueue.c:3362 [inline]
worker_thread+0x9b0/0xee0 kernel/workqueue.c:3443
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
task:syz.7.2686 state:R running task stack:25920 pid:18415 tgid:18409 ppid:15894 task_flags:0x400140 flags:0x00080000
Call Trace:
sched_show_task+0x49d/0x630 kernel/sched/core.c:7822
rcu_print_detail_task_stall_rnp kernel/rcu/tree_stall.h:292 [inline]
print_other_cpu_stall+0xf7a/0x1340 kernel/rcu/tree_stall.h:681
check_cpu_stall kernel/rcu/tree_stall.h:856 [inline]
rcu_pending kernel/rcu/tree.c:3667 [inline]
rcu_sched_clock_irq+0xac1/0x1280 kernel/rcu/tree.c:2704
update_process_times+0x23c/0x2f0 kernel/time/timer.c:2474
tick_sched_handle kernel/time/tick-sched.c:298 [inline]
tick_nohz_handler+0x3e9/0x710 kernel/time/tick-sched.c:319
__run_hrtimer kernel/time/hrtimer.c:1777 [inline]
__hrtimer_run_queues+0x4d0/0xc30 kernel/time/hrtimer.c:1841
hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline]
sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1056
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:page_pool_dma_sync_for_device net/core/page_pool.c:465 [inline]
RIP: 0010:__page_pool_put_page net/core/page_pool.c:844 [inline]
RIP: 0010:page_pool_put_unrefed_netmem+0x270/0xb40 net/core/page_pool.c:905
Code: 4d 8d 74 24 38 4d 89 f5 49 c1 ed 03 41 0f b6 44 1d 00 84 c0 0f 85 ac 06 00 00 41 0f b6 1e 89 de 83 e6 04 31 ff e8 10 6b 72 f8 <83> e3 04 75 71 e8 06 68 72 f8 4c 8b 6c 24 18 48 bb 00 00 00 00 00
RSP: 0018:ffffc90004f376d8 EFLAGS: 00000293
RAX: ffffffff894f5050 RBX: 0000000000000009 RCX: 0000000000000000
RDX: ffff888030cc9e80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea0000f5db37 R09: 1ffffd40001ebb66
R10: dffffc0000000000 R11: fffff940001ebb67 R12: ffff888055bb5000
R13: 1ffff1100ab76a07 R14: ffff888055bb5038 R15: 0000000000000000
xdp_test_run_batch net/bpf/test_run.c:341 [inline]
bpf_test_run_xdp_live+0xc4e/0x1b20 net/bpf/test_run.c:379
bpf_prog_test_run_xdp+0x7c0/0x10e0 net/bpf/test_run.c:1388
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4704
__sys_bpf+0x5ee/0x8a0 kernel/bpf/syscall.c:6226
__do_sys_bpf kernel/bpf/syscall.c:6321 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6319 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6319
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbfbef8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfbd1f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbfbf1e6180 RCX: 00007fbfbef8f749
RDX: 0000000000000050 RSI: 0000200000000b80 RDI: 000000000000000a
RBP: 00007fbfbf013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfbf1e6218 R14: 00007fbfbf1e6180 R15: 00007fff349f3fc8
rcu: rcu_preempt kthread starved for 10487 jiffies! g116401 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:26968 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
__schedule_loop kernel/sched/core.c:6948 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6963
schedule_timeout+0x12b/0x270 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x301/0x1540 kernel/rcu/tree.c:2083
rcu_gp_kthread+0x99/0x390 kernel/rcu/tree.c:2285
kthread+0x711/0x8a0 kernel/kthread.c:463
ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 18415 Comm: syz.7.2686 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:page_pool_dma_sync_for_device net/core/page_pool.c:465 [inline]
RIP: 0010:__page_pool_put_page net/core/page_pool.c:844 [inline]
RIP: 0010:page_pool_put_unrefed_netmem+0x270/0xb40 net/core/page_pool.c:905
Code: 4d 8d 74 24 38 4d 89 f5 49 c1 ed 03 41 0f b6 44 1d 00 84 c0 0f 85 ac 06 00 00 41 0f b6 1e 89 de 83 e6 04 31 ff e8 10 6b 72 f8 <83> e3 04 75 71 e8 06 68 72 f8 4c 8b 6c 24 18 48 bb 00 00 00 00 00
RSP: 0018:ffffc90004f376d8 EFLAGS: 00000293
RAX: ffffffff894f5050 RBX: 0000000000000009 RCX: 0000000000000000
RDX: ffff888030cc9e80 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffea0000f5db37 R09: 1ffffd40001ebb66
R10: dffffc0000000000 R11: fffff940001ebb67 R12: ffff888055bb5000
R13: 1ffff1100ab76a07 R14: ffff888055bb5038 R15: 0000000000000000
FS: 00007fbfbd1f66c0(0000) GS:ffff888125c25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7e4efb6ad8 CR3: 000000008b73a000 CR4: 00000000003526f0
Call Trace:
xdp_test_run_batch net/bpf/test_run.c:341 [inline]
bpf_test_run_xdp_live+0xc4e/0x1b20 net/bpf/test_run.c:379
bpf_prog_test_run_xdp+0x7c0/0x10e0 net/bpf/test_run.c:1388
bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4704
__sys_bpf+0x5ee/0x8a0 kernel/bpf/syscall.c:6226
__do_sys_bpf kernel/bpf/syscall.c:6321 [inline]
__se_sys_bpf kernel/bpf/syscall.c:6319 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6319
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbfbef8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbfbd1f6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fbfbf1e6180 RCX: 00007fbfbef8f749
RDX: 0000000000000050 RSI: 0000200000000b80 RDI: 000000000000000a
RBP: 00007fbfbf013f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbfbf1e6218 R14: 00007fbfbf1e6180 R15: 00007fff349f3fc8