rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=31901, q=404 ncpus=2)
task:kworker/0:1 state:R running task stack:20432 pid:10 tgid:10 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: mld mld_dad_work
Call Trace:
context_switch kernel/sched/core.c:5258 [inline]
__schedule+0x150e/0x5070 kernel/sched/core.c:6866
preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7193
irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:unwind_next_frame+0x4d/0x23d0 arch/x86/kernel/unwind_orc.c:486
Code: 8d 5f 48 48 89 d8 48 c1 e8 03 48 89 44 24 30 80 3c 28 00 74 08 48 89 df e8 c0 31 b4 00 48 89 5c 24 10 49 8b 5e 48 4d 8d 6e 38 <4c> 89 e8 48 c1 e8 03 48 89 44 24 58 80 3c 28 00 74 08 4c 89 ef e8
RSP: 0018:ffffc900000f73d8 EFLAGS: 00000246
RAX: 1ffff9200001ee9e RBX: ffffffff818de381 RCX: 4f9dfc025a558b00
RDX: dffffc0000000000 RSI: ffffffff818de381 RDI: ffffc900000f74a8
RBP: dffffc0000000000 R08: ffffc900000f7570 R09: 0000000000000007
R10: ffffc900000f74f8 R11: ffffffff81ad9d50 R12: ffff88801d2c9e80
R13: ffffc900000f74e0 R14: ffffc900000f74a8 R15: ffffc900000f74a8
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
save_netdev_trace_buffer+0xd7/0x5a0 net/core/dev.c:13435
__dev_hold include/linux/netdevice.h:4400 [inline]
netdev_hold include/linux/netdevice.h:4443 [inline]
dst_init+0x6f/0x460 net/core/dst.c:52
dst_alloc+0x12a/0x170 net/core/dst.c:93
ip6_dst_alloc net/ipv6/route.c:342 [inline]
icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3322
mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844
mld_dad_work+0x46/0x490 net/ipv6/mcast.c:2294
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
rcu: rcu_preempt kthread starved for 10542 jiffies! g31901 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:27128 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: 1 UID: 0 PID: 8883 Comm: syz.3.517 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:lock_release+0x2a6/0x3b0 kernel/locking/lockdep.c:5893
Code: 4d 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f7 44 24 20 00 02 00 00 75 52 f7 c3 00 02 00 00 74 01 fb 65 48 8b 05 2a 0f 01 11 <48> 3b 44 24 28 75 75 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9
RSP: 0018:ffffc90003ce7898 EFLAGS: 00000206
RAX: 5c8c492243ca8200 RBX: 0000000000000287 RCX: 5c8c492243ca8200
RDX: 0000000000000000 RSI: ffffffff8db7ed49 RDI: ffffffff8be07960
RBP: ffff888030504830 R08: ffffffff820fad90 R09: ffff88813fe1a8c0
R10: ffffc90003ce79b0 R11: fffff5200079cf3a R12: 0000000000000000
R13: 0000000000000000 R14: ffff88813fe1a8c0 R15: ffff888030503d00
FS: 00007fcd697726c0(0000) GS:ffff888125d25000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd69750f40 CR3: 0000000033984000 CR4: 00000000003526f0
Call Trace:
__copy_to_user include/linux/uaccess.h:151 [inline]
save_xstate_epilog arch/x86/kernel/fpu/signal.c:121 [inline]
copy_fpstate_to_sigframe+0xa6b/0xcc0 arch/x86/kernel/fpu/signal.c:232
get_sigframe+0x58d/0x7d0 arch/x86/kernel/signal.c:163
x64_setup_rt_frame+0x15b/0xd40 arch/x86/kernel/signal_64.c:175
setup_rt_frame arch/x86/kernel/signal.c:250 [inline]
handle_signal arch/x86/kernel/signal.c:294 [inline]
arch_do_signal_or_restart+0x3d1/0x7a0 arch/x86/kernel/signal.c:339
__exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
exit_to_user_mode_loop+0x87/0x4f0 kernel/entry/common.c:75
__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_work include/linux/entry-common.h:159 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
do_syscall_64+0x2d0/0xf80 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fcd6898f749
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:00007fcd697720e8 EFLAGS: 00000246
RAX: fffffffffffffffc RBX: 00007fcd68be5fa8 RCX: 00007fcd6898f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fcd68be5fa8
RBP: 00007fcd68be5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fcd68be6038 R14: 00007ffc02897a00 R15: 00007ffc02897ae8