syzbot

rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=6894/1/0x4000000000000000 softirq=12723/12724 fqs=4086
rcu: 	         hardirqs   softirqs   csw/system
rcu: 	 number:  1439204          0            0
rcu: 	cputime:    16545      35934           68   ==> 52480(ms)
rcu: 	(t=10500 jiffies g=11713 q=1473 ncpus=2)
CPU: 0 PID: 5926 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:get_current arch/x86/include/asm/current.h:41 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x60 kernel/kcov.c:215
Code: 00 00 f3 0f 1e fa 53 48 89 fb e8 13 00 00 00 48 8b 3d cc cb 03 0d 48 89 de 5b e9 d3 5f 57 00 cc cc cc f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0d a0 a0 7c 7e 65 8b 15 a1 a0 7c 7e 81 e2 00 01 ff 00 74
RSP: 0018:ffffc900000071b8 EFLAGS: 00000202
RAX: ffffffff813b34f1 RBX: ffffc90000007230 RCX: 0000000000000100
RDX: ffff88802bed9e00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffff88802bed9e00 R09: 0000000000000003
R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff81df18ae
R13: ffffffff8ca73388 R14: dffffc0000000000 R15: 1ffff92000000e46
FS:  000055558ddb1500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000001372 CR3: 000000001bab5000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 unwind_get_return_address+0x71/0xc0 arch/x86/kernel/unwind_orc.c:369
 arch_stack_walk+0x11d/0x190 arch/x86/kernel/stacktrace.c:26
 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:53
 ____kasan_kmalloc mm/kasan/common.c:375 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 ref_tracker_alloc+0x162/0x4c0 lib/ref_tracker.c:203
 __netdev_tracker_alloc include/linux/netdevice.h:4110 [inline]
 netdev_hold include/linux/netdevice.h:4139 [inline]
 ___neigh_create+0xc8b/0x2440 net/core/neighbour.c:658
 ip6_finish_output2+0x1581/0x1630 net/ipv6/ip6_output.c:132
 dst_output include/net/dst.h:467 [inline]
 NF_HOOK include/linux/netfilter.h:304 [inline]
 ndisc_send_skb+0xc26/0x14f0 net/ipv6/ndisc.c:513
 addrconf_rs_timer+0x2d5/0x630 net/ipv6/addrconf.c:4024
 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701
 expire_timers kernel/time/timer.c:1752 [inline]
 __run_timers+0x542/0x800 kernel/time/timer.c:2023
 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036
 handle_softirqs+0x280/0x820 kernel/softirq.c:578
 __do_softirq kernel/softirq.c:612 [inline]
 invoke_softirq kernel/softirq.c:452 [inline]
 __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661
 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_schedule_irq+0xba/0x150 kernel/sched/core.c:7010
Code: 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 6f bf 01 00 00 00 e8 61 cb cf f6 e8 ec d2 00 f7 fb bf 01 00 00 00 <e8> f1 b4 ff ff 43 c6 44 37 08 00 48 c7 44 24 40 00 00 00 00 9c 8f
RSP: 0018:ffffc90003247da0 EFLAGS: 00000286
RAX: 8fd40a1b600a7700 RBX: 0000000000000000 RCX: 8fd40a1b600a7700
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: 0000000000000001
RBP: ffffc90003247e40 R08: ffffffff8e8adeaf R09: 1ffffffff1d15bd5
R10: dffffc0000000000 R11: fffffbfff1d15bd6 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000648fb4
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:__syscall_enter_from_user_work kernel/entry/common.c:97 [inline]
RIP: 0010:syscall_enter_from_user_mode+0x2e/0x80 kernel/entry/common.c:118
Code: 41 56 53 48 89 f3 49 89 fe 48 8b 7c 24 10 e8 e9 fa ff ff 66 90 66 90 e8 00 12 09 f7 e8 bb 11 09 f7 fb 65 48 8b 05 92 42 7f 75 <48> 8b 70 08 40 f6 c6 3f 74 0b 4c 89 f7 5b 41 5e e9 0d 57 ef f6 48
RSP: 0018:ffffc90003247f08 EFLAGS: 00000286
RAX: ffff88802bed9e00 RBX: 00000000000000ca RCX: 8fd40a1b600a7700
RDX: dffffc0000000000 RSI: ffffffff8acac900 RDI: ffffffff8b1c82e0
RBP: ffffc90003247f48 R08: ffffffff8e8adeaf R09: 1ffffffff1d15bd5
R10: dffffc0000000000 R11: fffffbfff1d15bd6 R12: 0000000000000000
R13: 0000000000000000 R14: ffffc90003247f58 R15: 0000000000000000
 do_syscall_64+0x28/0xa0 arch/x86/entry/common.c:72
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fea01b9c799
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:00007ffc17af3588 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fea01b9c799
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007fea01e15fac
RBP: 0000000000001372 R08: 0000000000745d1e R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fea01e15fac R14: 00007fea01e15fa8 R15: 00007fea01e15fa0
 </TASK>