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MIME-Version: 1.0 X-Received: by 2002:a92:ad03:: with SMTP id w3mr203136ilh.22.1596471921612; Mon, 03 Aug 2020 09:25:21 -0700 (PDT) Date: Mon, 03 Aug 2020 09:25:21 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000c81ce605abfb956f@google.com> Subject: INFO: rcu detected stall in addrconf_rs_timer (4) From: syzbot To: fweisbec@gmail.com, linux-kernel@vger.kernel.org, mingo@kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: 7cc2a8ea Merge tag 'block-5.8-2020-07-01' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=113132a7100000 kernel config: https://syzkaller.appspot.com/x/.config?x=183dd243398ba7ec dashboard link: https://syzkaller.appspot.com/bug?extid=ca2665ae8487c46d365d compiler: clang version 10.0.0 (https://github.com/llvm/llvm-project/ c2443155a0fb245c8f17f2c1c72b6ea391e86e81) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13db60a3100000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11d5a66d100000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ca2665ae8487c46d365d@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=036/1/0x4000000000000000 softirq=8112/8113 fqs=5248 (t=10502 jiffies g=7165 q=165) NMI backtrace for cpu 0 CPU: 0 PID: 7101 Comm: syz-executor548 Not tainted 5.8.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x199/0x2a0 kernel/rcu/tree_stall.h:320 print_cpu_stall kernel/rcu/tree_stall.h:553 [inline] check_cpu_stall kernel/rcu/tree_stall.h:627 [inline] rcu_pending kernel/rcu/tree.c:3489 [inline] rcu_sched_clock_irq+0x1928/0x1eb0 kernel/rcu/tree.c:2504 update_process_times+0x12c/0x180 kernel/time/timer.c:1726 tick_sched_handle kernel/time/tick-sched.c:176 [inline] tick_sched_timer+0x254/0x410 kernel/time/tick-sched.c:1320 __run_hrtimer kernel/time/hrtimer.c:1520 [inline] __hrtimer_run_queues+0x42d/0x930 kernel/time/hrtimer.c:1584 hrtimer_interrupt+0x373/0xd60 kernel/time/hrtimer.c:1646 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline] __sysvec_apic_timer_interrupt+0xf0/0x260 arch/x86/kernel/apic/apic.c:1097 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:50 [inline] sysvec_apic_timer_interrupt+0x112/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:unwind_next_frame+0xb2/0x1e90 arch/x86/kernel/unwind_orc.c:437 Code: 00 00 48 89 4c 24 68 4c 89 6c 24 48 4c 89 64 24 40 4c 89 7c 24 58 48 89 6c 24 28 bf 01 00 00 00 e8 43 12 1d 00 48 89 5c 24 08 <48> 83 c3 50 48 89 d8 48 c1 e8 03 48 89 44 24 38 42 80 3c 30 00 74 RSP: 0018:ffffc90000007630 EFLAGS: 00000206 RAX: 0000000000000301 RBX: ffffc900000076f8 RCX: ffffc90001cd7f58 RDX: dffffc0000000000 RSI: ffffffff88200078 RDI: 0000000000000001 RBP: 1ffff92000000edf R08: 000000000000001a R09: ffffc900000077a8 R10: fffff52000000eeb R11: 0000000000000000 R12: ffffc90000007730 R13: 1ffff92000000ee6 R14: dffffc0000000000 R15: ffffffff88200078 arch_stack_walk+0xb4/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xad/0x150 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:48 [inline] set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] __do_kmalloc mm/slab.c:3654 [inline] __kmalloc+0x228/0x330 mm/slab.c:3665 kmalloc include/linux/slab.h:560 [inline] kzalloc+0x1d/0x40 include/linux/slab.h:669 neigh_alloc net/core/neighbour.c:399 [inline] ___neigh_create+0x54c/0x1c50 net/core/neighbour.c:577 ip6_finish_output2+0x95b/0x1400 net/ipv6/ip6_output.c:114 dst_output include/net/dst.h:435 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0x92d/0xd20 net/ipv6/ndisc.c:506 addrconf_rs_timer+0x226/0x680 net/ipv6/addrconf.c:3848 call_timer_fn+0x91/0x160 kernel/time/timer.c:1404 expire_timers kernel/time/timer.c:1449 [inline] __run_timers+0x736/0x930 kernel/time/timer.c:1773 run_timer_softirq+0x46/0x80 kernel/time/timer.c:1786 __do_softirq+0x268/0x80c kernel/softirq.c:292 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0xe0/0x1a0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:387 [inline] __irq_exit_rcu+0x1e1/0x1f0 kernel/softirq.c:417 irq_exit_rcu+0x6/0x50 kernel/softirq.c:429 sysvec_apic_timer_interrupt+0x117/0x130 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:596 RIP: 0010:__sanitizer_cov_trace_switch+0x46/0x100 kernel/kcov.c:319 Code: d3 00 00 00 48 c1 e9 03 ba 8b 00 00 00 0f a3 ca 0f 83 c1 00 00 00 4c 8b 16 4d 85 d2 0f 84 b5 00 00 00 4c 8b 04 c5 48 7f 64 88 <4c> 8b 4c 24 20 65 4c 8b 1c 25 00 fe 01 00 31 d2 eb 14 0f 1f 84 00 RSP: 0018:ffffc90001cd7c68 EFLAGS: 00000202 RAX: 0000000000000007 RBX: 0000000000000001 RCX: 0000000000000007 RDX: 000000000000008b RSI: ffffffff89309a70 RDI: ffff888087e62340 RBP: ffff888087e62340 R08: 0000000000000007 R09: ffffed1012283d8a R10: 0000000000000002 R11: 0000000000000000 R12: ffffffff8191d4d0 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff888090a9b000 event_function_call+0x181/0x580 kernel/events/core.c:274 perf_remove_from_context+0xb0/0x1e0 kernel/events/core.c:2338 perf_event_release_kernel+0x54b/0xc90 kernel/events/core.c:4918 perf_release+0x37/0x40 kernel/events/core.c:5014 __fput+0x2f0/0x750 fs/file_table.c:281 task_work_run+0x137/0x1c0 kernel/task_work.c:135 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop arch/x86/entry/common.c:216 [inline] __prepare_exit_to_usermode+0x14c/0x1e0 arch/x86/entry/common.c:246 do_syscall_64+0x7f/0xe0 arch/x86/entry/common.c:368 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x404670 Code: Bad RIP value. RSP: 002b:00007ffc65f0e6b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000000404670 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc00306777 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000036 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches