rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P5911/1:b..l
rcu: (detected by 0, t=10502 jiffies, g=88773, q=818 ncpus=2)
task:kworker/1:4 state:R running task stack:21032 pid:5911 tgid:5911 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: mld mld_ifc_work
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
irqentry_exit+0x599/0x620 kernel/entry/common.c:239
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__asan_memset+0x24/0x50 mm/kasan/shadow.c:84
Code: 90 90 90 90 90 90 f3 0f 1e fa 55 41 56 53 48 89 d3 89 f5 49 89 fe 48 8b 4c 24 18 48 89 d6 ba 01 00 00 00 e8 1e e5 ff ff 84 c0 <74> 11 4c 89 f7 89 ee 48 89 da 5b 41 5e 5d e9 69 c5 7f 09 31 c0 5b
RSP: 0018:ffffc900050671f8 EFLAGS: 00000202
RAX: ffffc90005067801 RBX: 0000000000000010 RCX: ffffffff8176985e
RDX: 0000000000000001 RSI: 0000000000000010 RDI: ffffc90005067338
RBP: 0000000000000000 R08: ffffc90005067347 R09: 1ffff92000a0ce68
R10: dffffc0000000000 R11: fffff52000a0ce69 R12: ffffc90005067338
R13: 1ffff92000a0ce5f R14: ffffc90005067338 R15: ffffc90005067330
unwind_next_frame+0xeae/0x23c0 arch/x86/kernel/unwind_orc.c:607
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
save_stack+0x122/0x230 mm/page_owner.c:165
__reset_page_owner+0x71/0x1f0 mm/page_owner.c:320
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
__slab_free+0x263/0x2b0 mm/slub.c:5573
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4538 [inline]
slab_alloc_node mm/slub.c:4866 [inline]
kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918
__alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702
alloc_skb include/linux/skbuff.h:1383 [inline]
mld_newpack+0x14c/0xc90 net/ipv6/mcast.c:1775
add_grhead+0x5a/0x2a0 net/ipv6/mcast.c:1886
add_grec+0x1452/0x1740 net/ipv6/mcast.c:2025
mld_send_cr net/ipv6/mcast.c:2148 [inline]
mld_ifc_work+0x6e6/0xe70 net/ipv6/mcast.c:2693
process_one_work kernel/workqueue.c:3276 [inline]
process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3359
worker_thread+0xa53/0xfc0 kernel/workqueue.c:3440
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: rcu_preempt kthread starved for 10548 jiffies! g88773 f0x0 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:27744 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00080000
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
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: 18242 Comm: syz.2.2287 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:class_spinlock_irqsave_constructor include/linux/spinlock.h:618 [inline]
RIP: 0010:posix_timer_fn+0x27/0x1c0 kernel/time/posix-timers.c:371
Code: 90 90 90 f3 0f 1e fa 55 41 57 41 56 41 55 41 54 53 49 89 ff 49 bd 00 00 00 00 00 fc ff df e8 f0 62 10 00 49 8d 9f 28 ff ff ff <48> 89 df e8 51 f1 fc 09 49 89 c6 48 c7 c0 c0 09 12 90 48 c1 e8 03
RSP: 0018:ffffc90000a08d08 EFLAGS: 00000006
RAX: ffffffff81b55ce0 RBX: ffff8880783ce240 RCX: ffff88801dbe3d00
RDX: 0000000000010000 RSI: 0000000000000000 RDI: ffff8880783ce318
RBP: ffffc90000a08e88 R08: ffffffff9011d6b7 R09: 1ffffffff2023ad6
R10: dffffc0000000000 R11: ffffffff81b55cc0 R12: ffff8880783ce318
R13: dffffc0000000000 R14: ffffffff81b55cc0 R15: ffff8880783ce318
FS: 00007f03d11df6c0(0000) GS:ffff888125554000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000002540 CR3: 000000005cb00000 CR4: 0000000000350ef0
Call Trace:
__run_hrtimer kernel/time/hrtimer.c:1785 [inline]
__hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849
hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline]
__sysvec_apic_timer_interrupt+0x102/0x460 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:handle_signal arch/x86/kernel/signal.c:-1 [inline]
RIP: 0010:arch_do_signal_or_restart+0x117/0x830 arch/x86/kernel/signal.c:339
Code: c7 00 49 8b 04 24 48 89 44 24 08 41 89 c4 bf ff ff ff ff 4c 89 e6 e8 e8 81 5d 00 b8 ff ff ff ff 49 39 c4 75 51 e8 f9 7c 5d 00 cf 00 00 00 4c 89 f9 4c 8d 7b 78 4c 89 f8 48 c1 e8 03 80 3c 08
RSP: 0018:ffffc90003c8fd80 EFLAGS: 00000246
RAX: ffffffff816842d7 RBX: ffffc90003c8ff48 RCX: 0000000000080000
RDX: ffffc90003fe2000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90003c8fe90 R08: ffffffff9011d6b7 R09: 1ffffffff2023ad6
R10: dffffc0000000000 R11: fffffbfff2023ad7 R12: 00000000ffffffff
R13: 1ffff92000791fb4 R14: ffff88801dbe3d00 R15: dffffc0000000000
__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:226 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [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: 0033:0x7f03d039c817
Code: 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89
RSP: 002b:00007f03d11df0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007f03d0615fa8 RCX: 00007f03d039c819
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f03d0615fa8
RBP: 00007f03d0615fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f03d0616038 R14: 00007ffecb664320 R15: 00007ffecb664408