rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-.... } 2680 jiffies s: 5069 root: 0x1/.
rcu: blocking rcu_node structures (internal RCU debug):
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4583 Comm: syz.3.52 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:178 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x2a/0x60 kernel/kcov.c:212
Code: 48 8b 04 24 65 48 8b 0d b4 28 80 7e 65 8b 15 b5 28 80 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 <74> 2c 8b 91 f8 15 00 00 83 fa 02 75 21 48 8b 91 00 16 00 00 48 8b
RSP: 0018:ffffc90000006e78 EFLAGS: 00000046
RAX: ffffffff81a93288 RBX: 0000000000000000 RCX: ffff888079d48000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000008
RBP: ffffc90000006f48 R08: ffffffff8f00d22f R09: 1ffffffff1e01a45
R10: dffffc0000000000 R11: fffffbfff1e01a46 R12: 0000000000000001
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff92000000dd4
FS: 00007f2e5cdac6c0(0000) GS:ffff8880b8c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 000000002f82f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
put_callchain_entry kernel/events/callchain.c:176 [inline]
get_perf_callchain+0x3c8/0x490 kernel/events/callchain.c:223
perf_callchain kernel/events/core.c:7522 [inline]
perf_prepare_sample+0x399/0x2020 kernel/events/core.c:7555
__perf_event_output kernel/events/core.c:7740 [inline]
perf_event_output_forward+0x197/0x2f0 kernel/events/core.c:7760
__perf_event_overflow+0x457/0x630 kernel/events/core.c:9506
perf_swevent_overflow kernel/events/core.c:9589 [inline]
perf_swevent_event+0x315/0x570 kernel/events/core.c:9640
perf_tp_event+0x36b/0xc10 kernel/events/core.c:10074
perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:10042
perf_trace_preemptirq_template+0x268/0x320 include/trace/events/preemptirq.h:14
trace_irq_enable_rcuidle+0xd3/0x140 include/trace/events/preemptirq.h:40
trace_hardirqs_on+0x24/0x40 kernel/trace/trace_preemptirq.c:44
asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:rcu_read_unlock_special+0x7f/0x510 kernel/rcu/tree_plugin.h:685
Code: eb 03 48 b8 f1 f1 f1 f1 f8 f2 f2 f2 4a 89 04 2b 42 c7 44 2b 08 f8 f3 f3 f3 65 44 8b 35 d2 68 95 7e 41 f7 c6 00 00 f0 00 74 40 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 42 c7 44 2b 08
RSP: 0018:ffffc90000007760 EFLAGS: 00000206
RAX: b60cd2f672db4b00 RBX: 1ffff92000000ef4 RCX: b60cd2f672db4b00
RDX: dffffc0000000000 RSI: ffffffff8a8c19a0 RDI: ffffffff8adf71a0
RBP: ffffc90000007860 R08: ffffffff91934337 R09: 1ffffffff2326866
R10: dffffc0000000000 R11: fffffbfff2326867 R12: 0000000000000246
R13: dffffc0000000000 R14: ffff8880b8c3bb00 R15: 0000000000000001
__rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:426
rcu_read_unlock include/linux/rcupdate.h:823 [inline]
ndisc_send_skb+0xdc2/0x1520 net/ipv6/ndisc.c:521
addrconf_rs_timer+0x367/0x640 net/ipv6/addrconf.c:3994
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_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:clear_page_erms+0x7/0x10 arch/x86/lib/clear_page_64.S:50
Code: 48 89 47 18 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 90 90 90 90 90 90 90 b9 00 10 00 00 31 c0 aa c3 90 90 90 90 90 90 89 c8 48 c1 e9 03 74 18 0f 1f 84 00 00
RSP: 0018:ffffc90004f5f870 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000d40
RDX: ffff888079407000 RSI: 0000000000000001 RDI: ffff8880794072c0
RBP: 00000000001d20c0 R08: ffffea0001e50037 R09: ffffed100f280000
R10: dffffc0000000000 R11: fffff940003ca007 R12: 0000000000000001
R13: 0000000000000000 R14: ffffea0001e50000 R15: 0000000000000008
clear_page arch/x86/include/asm/page_64.h:58 [inline]
clear_highpage include/linux/highmem.h:242 [inline]
clear_highpage_kasan_tagged include/linux/highmem.h:252 [inline]
kernel_init_pages mm/page_alloc.c:1408 [inline]
post_alloc_hook+0x12c/0x1a0 mm/page_alloc.c:2555
prep_new_page mm/page_alloc.c:2567 [inline]
get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
alloc_slab_page+0x5d/0x180 mm/slub.c:1799
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x87/0x2d0 mm/slub.c:1997
___slab_alloc+0xbc5/0x1240 mm/slub.c:3154
__slab_alloc mm/slub.c:3240 [inline]
slab_alloc_node mm/slub.c:3325 [inline]
kmem_cache_alloc_node+0x134/0x310 mm/slub.c:3404
perf_event_alloc+0x155/0x21e0 kernel/events/core.c:11888
__do_sys_perf_event_open kernel/events/core.c:12536 [inline]
__se_sys_perf_event_open+0x701/0x1ec0 kernel/events/core.c:12428
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2e5bf9e559
Code: 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 01 48
RSP: 002b:00007f2e5cdac028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f2e5c225fa0 RCX: 00007f2e5bf9e559
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f2e5c0358b0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2e5c226038 R14: 00007f2e5c225fa0 R15: 00007ffc251bce78