rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 4963 jiffies s: 115861 root: 0x2/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 24916 Comm: syz.4.6575 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:perf_trace_lock_acquire+0x352/0x3f0 include/trace/events/lock.h:24
Code: 01 00 00 00 4c 89 e7 44 89 ee 48 8b 4c 24 38 6a 00 ff 74 24 20 e8 7e 21 42 00 48 83 c4 10 43 c6 44 3e 08 f8 43 c6 44 3e 04 f8 <48> c7 44 24 40 0e 36 e0 45 4b c7 04 3e 00 00 00 00 43 c7 44 3e 08
RSP: 0018:ffffc900001e0380 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffffffff8c9f9a40 RCX: ffff888058a09e00
RDX: 0000000000000100 RSI: 00000000ffffffff RDI: 0000000000000000
RBP: ffffc900001e0480 R08: 0000000000000002 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: ffffffff8c9f99c0
R13: 000000000000002c R14: 1ffff9200003c078 R15: dffffc0000000000
FS:  00007fdfffe5b6c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e618ff8 CR3: 000000007baef000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire+0x452/0x4a0 kernel/locking/lockdep.c:5647
 rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
 rcu_read_lock include/linux/rcupdate.h:791 [inline]
 trace_call_bpf+0xe0/0x6b0 kernel/trace/bpf_trace.c:134
 perf_trace_run_bpf_submit+0x79/0x1c0 kernel/events/core.c:10027
 perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish+0x13f/0x180 kernel/trace/trace_preemptirq.c:67
 irqentry_enter+0x33/0x50 kernel/entry/common.c:382
 sysvec_apic_timer_interrupt+0xa/0xc0 arch/x86/kernel/apic/apic.c:1118
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:get_random_u32+0x540/0x930 drivers/char/random.c:513
Code: f8 fc 4d 85 f6 75 16 e8 6e 56 f8 fc eb 15 e8 67 56 f8 fc e8 82 40 a6 05 4d 85 f6 74 ea e8 58 56 f8 fc fb 8b 84 24 00 01 00 00 <43> c6 44 2f 18 f8 48 c7 44 24 40 0e 36 e0 45 4b c7 04 2f 00 00 00
RSP: 0018:ffffc900001e0900 EFLAGS: 00000246
RAX: 00000000c34e3865 RBX: 0000000000000000 RCX: ffff888058a09e00
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc900001e0a68 R08: ffffffff90b102cf R09: 1ffffffff2162059
R10: dffffc0000000000 R11: fffffbfff216205a R12: 0000000000000017
R13: dffffc0000000000 R14: 0000000000000200 R15: 1ffff9200003c128
 get_random_u32_below include/linux/random.h:87 [inline]
 prandom_u32_max include/linux/prandom.h:29 [inline]
 rfc3315_s14_backoff_update+0x14/0xc0 net/ipv6/addrconf.c:115
 addrconf_rs_timer+0x3b2/0x640 net/ipv6/addrconf.c:3992
 call_timer_fn+0x1ac/0x670 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x56c/0x810 kernel/time/timer.c:2023
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x291/0x910 kernel/softirq.c:596
 __do_softirq kernel/softirq.c:630 [inline]
 invoke_softirq kernel/softirq.c:470 [inline]
 __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x9d/0xc0 arch/x86/kernel/irq_work.c:17
 </IRQ>
 <TASK>
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:finish_task_switch+0x267/0x8e0 kernel/sched/core.c:5125
Code: d6 08 85 c0 0f 84 38 01 00 00 48 85 db 0f 85 57 01 00 00 0f 1f 44 00 00 4c 89 e7 e8 93 b1 e0 08 e8 2e 11 2f 00 fb 4c 8b 65 b8 <49> 8d bc 24 f8 15 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0
RSP: 0018:ffffc90004b67ba0 EFLAGS: 00000286
RAX: 26d671120ef20d00 RBX: 0000000000000000 RCX: 26d671120ef20d00
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90004b67bf0 R08: ffff8880b8f3ad03 R09: 1ffff110171e75a0
R10: dffffc0000000000 R11: ffffed10171e75a1 R12: ffff888058a09e00
R13: 1ffff110171e76fa R14: dffffc0000000000 R15: ffff8880b8f3b7d0
 context_switch kernel/sched/core.c:5249 [inline]
 __schedule+0x1087/0x4030 kernel/sched/core.c:6563
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6875
 irqentry_exit+0x63/0x70 kernel/entry/common.c:439
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2a/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 ed fa ff ff 66 90 66 90 e8 f4 75 58 f7 e8 6f 74 58 f7 fb 65 48 8b 05 76 50 d2 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 d1 d0 3e f7 48
RSP: 0018:ffffc90004b67f08 EFLAGS: 00000286
RAX: ffff888058a09e00 RBX: 000000000000000f RCX: 26d671120ef20d00
RDX: dffffc0000000000 RSI: ffffffff8a8c17a0 RDI: ffffffff8adf5de0
RBP: ffffc90004b67f48 R08: ffffffff8e210aef R09: 1ffffffff1c4215d
R10: dffffc0000000000 R11: fffffbfff1c4215e R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90004b67f58 R15: 0000000000000000
 do_syscall_64+0x24/0xa0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fdffef3f459
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007fdfffe5ab40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007fdfff226098 RCX: 00007fdffef3f459
RDX: 00007fdfffe5ab40 RSI: 00007fdfffe5ac70 RDI: 0000000000000021
RBP: 00007fdfff226090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fdfff226128 R14: 00007ffc0f8f5700 R15: 00007ffc0f8f57e8
 </TASK>