rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P10/1:b..l P5971/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=11409, q=532 ncpus=2)
task:syz-executor    state:R  running task     stack:19496 pid:5971  tgid:5971  ppid:5968   task_flags:0x400140 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6864
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7191
 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:on_stack arch/x86/include/asm/stacktrace.h:60 [inline]
RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:393 [inline]
RIP: 0010:deref_stack_reg+0xc3/0x230 arch/x86/kernel/unwind_orc.c:403
Code: 85 3c 01 00 00 41 83 3f 00 0f 95 c0 4c 39 c3 0f 96 c1 20 c1 4d 39 c6 0f 97 c0 20 c8 3c 01 75 18 49 8d 40 08 48 39 d8 0f 97 c1 <4c> 39 f0 0f 96 c0 84 c1 0f 85 c3 00 00 00 49 8d 7f 28 48 89 f8 48
RSP: 0000:ffffc900035f6500 EFLAGS: 00000206
RAX: ffffc900035f7cb8 RBX: ffffc900035f0000 RCX: 0000000000000001
RDX: ffffc900035f6668 RSI: dffffc0000000000 RDI: ffffc900035f6628
RBP: 1ffff920006becc5 R08: ffffc900035f7cb0 R09: 0000000000000000
R10: ffffc900035f6678 R11: fffff520006becd1 R12: 1ffff920006becc6
R13: 1ffff920006becc7 R14: ffffc900035f8000 R15: ffffc900035f6628
 unwind_next_frame+0x17c4/0x2390 arch/x86/kernel/unwind_orc.c:-1
 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:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 unpoison_slab_object mm/kasan/common.c:339 [inline]
 __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4948 [inline]
 slab_alloc_node mm/slub.c:5258 [inline]
 kmem_cache_alloc_node_noprof+0x43c/0x720 mm/slub.c:5310
 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586
 __alloc_skb+0x27e/0x430 net/core/skbuff.c:690
 alloc_skb include/linux/skbuff.h:1383 [inline]
 nlmsg_new include/net/netlink.h:1055 [inline]
 inet6_ifmcaddr_notify+0xeb/0x1d0 net/ipv6/mcast.c:909
 __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
 cfg80211_register_netdevice+0x138/0x2d0 net/wireless/core.c:1534
 ieee80211_if_add+0xe50/0x1370 net/mac80211/iface.c:2337
 ieee80211_register_hw+0x35d9/0x4110 net/mac80211/main.c:1607
 mac80211_hwsim_new_radio+0x2f76/0x5320 drivers/net/wireless/virtual/mac80211_hwsim.c:5810
 hwsim_new_radio_nl+0xf5b/0x1bd0 drivers/net/wireless/virtual/mac80211_hwsim.c:6504
 genl_family_rcv_msg_doit+0x215/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 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:728
 __sock_sendmsg net/socket.c:743 [inline]
 __sys_sendto+0x3ce/0x540 net/socket.c:2212
 __do_sys_sendto net/socket.c:2219 [inline]
 __se_sys_sendto net/socket.c:2215 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2215
 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: 0033:0x7ffa583915dc
RSP: 002b:00007ffca3fc5ec0 EFLAGS: 00000293 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007ffa59114620 RCX: 00007ffa583915dc
RDX: 0000000000000024 RSI: 00007ffa59114670 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00007ffca3fc5f14 R09: 000000000000000c
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000003
R13: 0000000000000000 R14: 00007ffa59114670 R15: 0000000000000000
 </TASK>
task:kworker/0:1     state:R  running task     stack:23544 pid:10    tgid:10    ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events_power_efficient gc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6864
 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7191
 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:seqcount_lockdep_reader_access+0x17e/0x1c0 include/linux/seqlock.h:75
Code: f8 4d 85 e4 75 16 e8 d1 59 36 f8 eb 15 e8 ca 59 36 f8 e8 45 58 d7 01 4d 85 e4 74 ea e8 bb 59 36 f8 fb 48 c7 04 24 0e 36 e0 45 <4b> c7 04 3e 00 00 00 00 66 43 c7 44 3e 09 00 00 43 c6 44 3e 0b 00
RSP: 0018:ffffc900000f7860 EFLAGS: 00000293
RAX: ffffffff898b9975 RBX: 0000000000000000 RCX: ffff88801d691e80
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900000f7910 R08: ffffffff8fc2d477 R09: 1ffffffff1f85a8e
R10: dffffc0000000000 R11: fffffbfff1f85a8f R12: 0000000000000200
R13: 1ffff11003ad2460 R14: 1ffff9200001ef0c R15: dffffc0000000000
 nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:342 [inline]
 gc_worker+0x308/0x1380 net/netfilter/nf_conntrack_core.c:1548
 process_one_work+0x93a/0x15a0 kernel/workqueue.c:3261
 process_scheduled_works kernel/workqueue.c:3344 [inline]
 worker_thread+0x9b0/0xee0 kernel/workqueue.c:3425
 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>
rcu: rcu_preempt kthread starved for 10604 jiffies! g11409 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:27736 pid:16    tgid:16    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5257 [inline]
 __schedule+0x14bc/0x5000 kernel/sched/core.c:6864
 __schedule_loop kernel/sched/core.c:6946 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6961
 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
 </TASK>
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: 6067 Comm: syz.1.18 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:lapic_next_event+0x0/0x20 arch/x86/kernel/apic/apic.c:417
Code: 41 20 07 c6 05 70 7a 55 11 01 0f b6 05 49 78 55 11 c3 cc cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 89 fe bf 80 03 00 00 e8 1f 2d 01 00 31 c0 c3 cc cc
RSP: 0018:ffffc90002f87a30 EFLAGS: 00000046
RAX: 1ffff110170c47c9 RBX: ffff8880b8623e40 RCX: 0000000000000020
RDX: 0000000000000000 RSI: ffff8880b8623e40 RDI: 000000000000003e
RBP: 000000000000003e R08: ffffffff81afa9c5 R09: ffffffff99d15508
R10: 0000000000000003 R11: ffffffff8171cb10 R12: ffff8880b8623e80
R13: ffff8880b8623e78 R14: 0000000000000020 R15: dffffc0000000000
FS:  00005555682f3500(0000) GS:ffff888125a03000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd2d4dfa80 CR3: 00000000734b8000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 clockevents_program_min_delta+0x1b0/0x350 kernel/time/clockevents.c:248
 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+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa5d318f749
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:00007ffd2d4dfc48 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fa5d33e7da0 RCX: 00007fa5d318f749
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007fa5d33e7da0 R08: 0000000000000000 R09: 000000072d4dff3f
R10: 00007fa5d33e7cb0 R11: 0000000000000246 R12: 00000000000223bc
R13: 00007fa5d33e6090 R14: ffffffffffffffff R15: 00007ffd2d4dfd60
 </TASK>