rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10669/1:b..l
rcu: (detected by 1, t=10503 jiffies, g=24605, q=513 ncpus=2)
task:syz-executor state:R running task stack:21976 pid:10669 tgid:10669 ppid:10667 task_flags:0x400140 flags:0x00080000
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:lock_release+0x80/0x3b0 kernel/locking/lockdep.c:5881
Code: 21 25 0e 00 0f 84 3e 02 00 00 65 8b 05 f9 a6 25 11 85 c0 0f 85 2f 02 00 00 65 4c 8b 3c 25 08 40 c4 92 41 83 bf 2c 0b 00 00 00 <0f> 85 18 02 00 00 49 81 3e c0 03 88 93 0f 84 0b 02 00 00 48 c7 44
RSP: 0018:ffffc90003e6e250 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffffff90e28f01 RCX: 48d2a273610c4700
RDX: ffffc90003e6e301 RSI: ffffffff8be247c0 RDI: ffffffff8be24780
RBP: dffffc0000000000 R08: ffffc90003e6e908 R09: 0000000000000000
R10: ffffc90003e6e3d8 R11: fffff520007cdc7d R12: ffffc90003e6e918
R13: ffffffff81746f85 R14: ffffffff8e33f2e0 R15: ffff888059940000
rcu_lock_release include/linux/rcupdate.h:341 [inline]
rcu_read_unlock include/linux/rcupdate.h:897 [inline]
class_rcu_destructor include/linux/rcupdate.h:1195 [inline]
unwind_next_frame+0x1ab1/0x23d0 arch/x86/kernel/unwind_orc.c:695
arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kmem_cache_free+0x197/0x620 mm/slub.c:6785
netlink_broadcast_filtered+0xec7/0x1000 net/netlink/af_netlink.c:1535
nlmsg_multicast_filtered include/net/netlink.h:1165 [inline]
nlmsg_multicast include/net/netlink.h:1184 [inline]
nlmsg_notify+0xf0/0x1a0 net/netlink/af_netlink.c:2593
inet6_ifmcaddr_notify+0x134/0x1d0 net/ipv6/mcast.c:923
__ipv6_dev_mc_inc+0x8a9/0xa50 net/ipv6/mcast.c:973
ipv6_add_dev+0xe52/0x13c0 net/ipv6/addrconf.c:472
addrconf_notify+0x771/0x1050 net/ipv6/addrconf.c:3650
notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2269 [inline]
call_netdevice_notifiers net/core/dev.c:2283 [inline]
register_netdevice+0x15bd/0x1a70 net/core/dev.c:11430
veth_newlink+0x437/0xa60 drivers/net/veth.c:1856
rtnl_newlink_create+0x310/0xb00 net/core/rtnetlink.c:3840
__rtnl_newlink net/core/rtnetlink.c:3957 [inline]
rtnl_newlink+0x16e7/0x1c90 net/core/rtnetlink.c:4072
rtnetlink_rcv_msg+0x7cf/0xb70 net/core/rtnetlink.c:6958
netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894
sock_sendmsg_nosec+0x18f/0x1d0 net/socket.c:737
__sock_sendmsg net/socket.c:752 [inline]
__sys_sendto+0x3ce/0x540 net/socket.c:2221
__do_sys_sendto net/socket.c:2228 [inline]
__se_sys_sendto net/socket.c:2224 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2224
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: 0033:0x7f93743915dc
RSP: 002b:00007ffdae945530 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f9375114620 RCX: 00007f93743915dc
RDX: 0000000000000068 RSI: 00007f9375114670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffdae945584 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007f9375114670 R15: 0000000000000000
rcu: rcu_preempt kthread starved for 10563 jiffies! g24605 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:27728 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:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 10901 Comm: syz.2.2409 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lockdep_enabled kernel/locking/lockdep.c:121 [inline]
RIP: 0010:lock_acquire+0x98/0x340 kernel/locking/lockdep.c:5844
Code: 0f 84 f0 00 00 00 48 8b b4 24 90 00 00 00 4c 89 ef e8 dc c7 89 00 83 3d a5 52 25 0e 00 0f 84 fa 00 00 00 65 8b 05 a8 d7 25 11 <85> c0 0f 85 eb 00 00 00 65 48 8b 04 25 08 40 c4 92 83 b8 2c 0b 00
RSP: 0018:ffffc90002fa7900 EFLAGS: 00000002
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 4eb62d4e460f5f00
RDX: 0000000000000000 RSI: ffffffff81afa39f RDI: 1ffffffff33a7aa1
RBP: ffffffff81afa4e5 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000000 R12: 0000000000000002
R13: ffffffff99d3d508 R14: 0000000000000000 R15: 0000000000000001
FS: 00007fb954f6a6c0(0000) GS:ffff8881259dc000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000058 CR3: 00000000207b0000 CR4: 00000000003526f0
Call Trace:
seqcount_lockdep_reader_access+0xcf/0x1c0 include/linux/seqlock.h:72
ktime_get+0x45/0x200 kernel/time/timekeeping.c:824
clockevents_program_event+0xe8/0x350 kernel/time/clockevents.c:326
hrtimer_start_range_ns+0xd8a/0x1080 kernel/time/hrtimer.c:1323
__posixtimer_deliver_signal kernel/time/posix-timers.c:321 [inline]
posixtimer_deliver_signal+0x1cf/0x410 kernel/time/posix-timers.c:347
dequeue_signal+0x24a/0x370 kernel/signal.c:660
get_signal+0x55e/0x1340 kernel/signal.c:2914
arch_do_signal_or_restart+0x9a/0x7a0 arch/x86/kernel/signal.c:337
__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: 0033:0x7fb95418f747
Code: ff ff 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
RSP: 002b:00007fb954f6a0e8 EFLAGS: 00000246
RAX: 00000000000000ca RBX: 00007fb9543e5fa8 RCX: 00007fb95418f749
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fb9543e5fa8
RBP: 00007fb9543e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9543e6038 R14: 00007ffce99c90e0 R15: 00007ffce99c91c8