rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	0-....: (1 GPs behind) idle=8a5/1/0x4000000000000002 softirq=23771/23772 fqs=5191 
	(detected by 1, t=10502 jiffies, g=33365, q=1114)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11030 Comm: syz.5.2172 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:perf_trace_buf_alloc+0x166/0x300 kernel/trace/trace_event_perf.c:420
Code: 00 89 ee e8 4c 3a f8 ff 83 fd 03 0f 87 fc 00 00 00 e8 de 36 f8 ff 4e 8d 34 fd 80 ae 10 96 4c 89 f0 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 f7 e8 00 9a 3c 00 4d 8b 3e e8 18 b0 28 08 89 c5 41 89
RSP: 0018:ffffc90000007580 EFLAGS: 00000046
RAX: 1ffffffff2c215d1 RBX: 0000000000000014 RCX: ffff88802852bb80
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000004
RBP: 0000000000000001 R08: dffffc0000000000 R09: ffffed101720765a
R10: ffffed101720765a R11: 1ffff11017207659 R12: ffffffff8bbbe820
R13: dffffc0000000000 R14: ffffffff9610ae88 R15: 0000000000000001
FS:  00007f7dc473c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000003b000 CR3: 0000000074feb000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 perf_trace_preemptirq_template+0x178/0x380 include/trace/events/preemptirq.h:14
 trace_irq_enable_rcuidle+0x108/0x180 include/trace/events/preemptirq.h:40
 trace_hardirqs_on+0x57/0x80 kernel/trace/trace_preemptirq.c:44
 asm_sysvec_irq_work+0x16/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:rcu_read_unlock_special+0x84/0x480 kernel/rcu/tree_plugin.h:671
Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 7d 16 9e 7e 41 f7 c6 00 00 f0 00 74 45 <48> c7 44 24 20 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b
RSP: 0018:ffffc900000077a0 EFLAGS: 00000206
RAX: 0ed5d64d3339e600 RBX: 1ffff92000000ef8 RCX: 0ed5d64d3339e600
RDX: dffffc0000000000 RSI: ffffffff8a0b15c0 RDI: ffffffff8a599340
RBP: ffffc90000007880 R08: dffffc0000000000 R09: fffffbfff1ff6e39
R10: fffffbfff1ff6e39 R11: 1ffffffff1ff6e38 R12: ffffffff8c120800
R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001
 __rcu_read_unlock+0x78/0xd0 kernel/rcu/tree_plugin.h:422
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 ndisc_send_skb+0xdc4/0x14a0 net/ipv6/ndisc.c:521
 addrconf_rs_timer+0x2b8/0x600 net/ipv6/addrconf.c:3957
 call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
 expire_timers kernel/time/timer.c:1496 [inline]
 __run_timers+0x525/0x7c0 kernel/time/timer.c:1767
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 __do_softirq kernel/softirq.c:610 [inline]
 invoke_softirq kernel/softirq.c:450 [inline]
 __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:_compound_head include/linux/page-flags.h:196 [inline]
RIP: 0010:__SetPageLocked include/linux/page-flags.h:342 [inline]
RIP: 0010:shmem_alloc_and_acct_page+0x67a/0xb70 mm/shmem.c:1613
Code: 4c 8b 33 4c 89 f6 48 83 e6 01 31 ff e8 bf 98 d2 ff 49 83 e6 01 0f 85 81 04 00 00 43 80 3c 3c 00 74 08 48 89 df e8 06 f8 16 00 <4c> 8b 33 44 89 f6 83 e6 01 31 ff e8 96 98 d2 ff 41 f6 c6 01 0f 85
RSP: 0018:ffffc9000306f620 EFLAGS: 00000246
RAX: ffffffff81a52f41 RBX: ffffea0001688ec8 RCX: ffff88802852bb80
RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000306f920 R08: dffffc0000000000 R09: fffffbfff1ad2dd6
R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: 1ffffd40002d11d9
R13: ffffea0001688ec0 R14: 0000000000000000 R15: dffffc0000000000
 shmem_getpage_gfp+0x14f4/0x2d40 mm/shmem.c:1906
 shmem_getpage mm/shmem.c:151 [inline]
 shmem_write_begin+0xcd/0x1a0 mm/shmem.c:2474
 generic_perform_write+0x2aa/0x530 mm/filemap.c:3785
 __generic_file_write_iter+0x25f/0x4e0 mm/filemap.c:3912
 generic_file_write_iter+0xa6/0x1b0 mm/filemap.c:3944
 call_write_iter include/linux/fs.h:2172 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x712/0xd00 fs/read_write.c:594
 ksys_write+0x14d/0x250 fs/read_write.c:647
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7dc64f5be9
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:00007f7dc473c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f7dc671d090 RCX: 00007f7dc64f5be9
RDX: 00000000002a979d RSI: 0000200000000000 RDI: 000000000000000c
RBP: 00007f7dc6578e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7dc671d128 R14: 00007f7dc671d090 R15: 00007ffd187d6b58
 </TASK>