rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-.... } 3669 jiffies s: 8533 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: 5878 Comm: syz.4.843 Not tainted 6.1.111-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__read_once_word_nocheck+0x3/0x10 include/asm-generic/rwonce.h:67
Code: c1 0f 8c dc fc ff ff 48 89 df e8 e8 51 a5 00 48 ba 00 00 00 00 00 fc ff df e9 c5 fc ff ff 66 0f 1f 84 00 00 00 00 00 48 8b 07 <c3> cc cc cc cc cc cc cc cc cc cc cc cc 31 c0 81 ff 03 00 00 40 0f
RSP: 0018:ffffc900001e0418 EFLAGS: 00000287
RAX: ffffffff8ac00d46 RBX: 1ffff9200003c0a0 RCX: 0000000000000001
RDX: ffffc900001e0500 RSI: ffffc9000a288000 RDI: ffffc9000a286fe0
RBP: ffffc900001e0500 R08: 0000000000000001 R09: ffffc900001e05f0
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc900001e0500
R13: ffffc9000a286fe0 R14: ffffc9000a288000 R15: ffffc9000a280000
FS:  0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ec1dff8 CR3: 000000000d08e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 deref_stack_reg arch/x86/kernel/unwind_orc.c:360 [inline]
 unwind_next_frame+0xd5d/0x2220 arch/x86/kernel/unwind_orc.c:539
 arch_stack_walk+0x10d/0x140 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
 __kasan_slab_alloc+0x65/0x70 mm/kasan/common.c:328
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook+0x52/0x3a0 mm/slab.h:737
 slab_alloc_node mm/slub.c:3398 [inline]
 kmem_cache_alloc_node+0x136/0x310 mm/slub.c:3443
 __alloc_skb+0xde/0x670 net/core/skbuff.c:505
 alloc_skb include/linux/skbuff.h:1271 [inline]
 ndisc_alloc_skb+0xee/0x2c0 net/ipv6/ndisc.c:424
 ndisc_send_rs+0x269/0x6a0 net/ipv6/ndisc.c:705
 addrconf_rs_timer+0x357/0x610 net/ipv6/addrconf.c:3963
 call_timer_fn+0x1ad/0x6b0 kernel/time/timer.c:1504
 expire_timers kernel/time/timer.c:1549 [inline]
 __run_timers+0x67c/0x890 kernel/time/timer.c:1820
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
 handle_softirqs+0x2ee/0xa40 kernel/softirq.c:571
 __do_softirq kernel/softirq.c:605 [inline]
 invoke_softirq kernel/softirq.c:445 [inline]
 __irq_exit_rcu+0x157/0x240 kernel/softirq.c:654
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:666
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1106
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:653
RIP: 0010:strlen+0x2d/0x60 lib/string.c:495
Code: 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 42 0f b6 04 38 <84> c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01 00 75 dd eb 13
RSP: 0018:ffffc9000a287098 EFLAGS: 00000a06
RAX: 0000000000000006 RBX: ffffffff8b0d1689 RCX: 000000008b0d1600
RDX: ffffffff81ecd888 RSI: ffffffff8d32b000 RDI: ffffffff8b0d1680
RBP: ffffc9000a2871d0 R08: dffffc0000000000 R09: fffffbfff1d33cae
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000008
R13: ffffffff81ecd888 R14: ffffffff8b0d1680 R15: dffffc0000000000
 trace_event_get_offsets_lock include/trace/events/lock.h:50 [inline]
 perf_trace_lock+0x10c/0x440 include/trace/events/lock.h:50
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release+0x995/0xa20 kernel/locking/lockdep.c:5673
 zap_pte_range mm/memory.c:1435 [inline]
 zap_pmd_range mm/memory.c:1574 [inline]
 zap_pud_range mm/memory.c:1603 [inline]
 zap_p4d_range mm/memory.c:1624 [inline]
 unmap_page_range+0x1b4a/0x2740 mm/memory.c:1645
 unmap_vmas+0x48b/0x640 mm/memory.c:1730
 exit_mmap+0x252/0x9f0 mm/mmap.c:3227
 __mmput+0x115/0x3c0 kernel/fork.c:1199
 exit_mm+0x226/0x300 kernel/exit.c:565
 do_exit+0x9f6/0x26a0 kernel/exit.c:858
 do_group_exit+0x202/0x2b0 kernel/exit.c:1021
 get_signal+0x16f7/0x17d0 kernel/signal.c:2870
 arch_do_signal_or_restart+0xb0/0x1a10 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x6a/0x100 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8f69f7def9
Code: Unable to access opcode bytes at 0x7f8f69f7decf.
RSP: 002b:00007f8f6ad45038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: 0000000000000007 RBX: 00007f8f6a135f80 RCX: 00007f8f69f7def9
RDX: 0000000000000048 RSI: 0000000020000240 RDI: 0000000000000000
RBP: 00007f8f69ff0b76 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f8f6a135f80 R15: 00007ffd3eb69968
 </TASK>