On Mon, Feb 12, 2018 at 4:22 PM, syzbot <syzbot+9a24dafd2f9855d33...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on net-next commit > d0adb51edb73c94a595bfa9d9bd8b35977e74fbf > > Unfortunately, I don't have any reproducer for this crash yet. > Raw console output is attached. > compiler: gcc (GCC) 7.1.1 20170620 > .config is attached.
+xfrm maintainers > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+9a24dafd2f9855d33...@syzkaller.appspotmail.com > It will help syzbot understand when the bug is fixed. See footer for > details. > If you forward the report, please keep this part and the footer. > > netlink: 4 bytes leftover after parsing attributes in process > `syz-executor0'. > INFO: rcu_sched self-detected stall on CPU > INFO: rcu_sched detected stalls on CPUs/tasks: > 0-...!: (1 GPs behind) idle=c92/140000000000001/0 > softirq=414248/414250 fqs=23 > (detected by 1, t=125002 jiffies, g=240513, c=240512, q=235) > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.15.0-rc5+ #177 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:76 [inline] > RIP: 0010:delay_tsc+0x48/0x70 arch/x86/lib/delay.c:68 > RSP: 0018:ffff8801db206ff0 EFLAGS: 00000007 > RAX: 000001f123cf45ac RBX: ffffffff88460f20 RCX: 000001f123cf422e > RDX: 000000000000037e RSI: 0000000000000000 RDI: 00000000000008fd > RBP: ffff8801db206ff0 R08: 1ffff1003b640d57 R09: 000000000000000c > R10: ffff8801db206f78 R11: 0000000000000060 R12: 0000000000002708 > R13: 0000000000000020 R14: fffffbfff108c229 R15: fffffbfff108c1ed > FS: 0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00000000201e0000 CR3: 0000000006422004 CR4: 00000000001606f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > __delay arch/x86/lib/delay.c:161 [inline] > __const_udelay+0x5b/0x70 arch/x86/lib/delay.c:175 > wait_for_xmitr+0x6f/0x1e0 drivers/tty/serial/8250/8250_port.c:2041 > serial8250_console_putchar+0x1f/0x60 > drivers/tty/serial/8250/8250_port.c:3170 > uart_console_write+0xac/0xe0 drivers/tty/serial/serial_core.c:1858 > serial8250_console_write+0x64f/0xa40 > drivers/tty/serial/8250/8250_port.c:3236 > univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:590 > call_console_drivers kernel/printk/printk.c:1574 [inline] > console_unlock+0x788/0xd80 kernel/printk/printk.c:2233 > vprintk_emit+0x4ad/0x590 kernel/printk/printk.c:1757 > vprintk_default+0x28/0x30 kernel/printk/printk.c:1796 > vprintk_func+0x57/0xc0 kernel/printk/printk_safe.c:379 > printk+0xaa/0xca kernel/printk/printk.c:1829 > print_cpu_stall_info_begin kernel/rcu/tree_plugin.h:1657 [inline] > print_cpu_stall kernel/rcu/tree.c:1594 [inline] > check_cpu_stall.isra.61+0x845/0x15b0 kernel/rcu/tree.c:1676 > __rcu_pending kernel/rcu/tree.c:3440 [inline] > rcu_pending kernel/rcu/tree.c:3502 [inline] > rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842 > update_process_times+0x30/0x60 kernel/time/timer.c:1630 > tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 > tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166 > __run_hrtimer kernel/time/hrtimer.c:1211 [inline] > __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275 > hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] > smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 > apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904 > </IRQ> > RIP: 0010:_decode_session6+0x555/0x1380 net/ipv6/xfrm6_policy.c:148 > RSP: 0018:ffff8801d9f3e590 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff11 > RAX: 1ffff1003a6418d0 RBX: ffff8801d320c5c0 RCX: ffff8801d320c684 > RDX: 0000000000000000 RSI: 000000000000fc89 RDI: ffff8801d320c644 > RBP: ffff8801d9f3e618 R08: ffffed0037a8a2a5 R09: ffffed0037a8a2a5 > R10: 000000000000000b R11: ffffed0037a8a2a4 R12: 000000000000fe61 > R13: ffff8801d9f3e8f0 R14: 000000000000fcb0 R15: dffffc0000000000 > __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2358 > __xfrm_policy_check+0x18c/0x2350 net/xfrm/xfrm_policy.c:2393 > __xfrm_policy_check2 include/net/xfrm.h:1170 [inline] > xfrm_policy_check include/net/xfrm.h:1175 [inline] > xfrm6_policy_check include/net/xfrm.h:1185 [inline] > rawv6_rcv+0x8f6/0x1200 net/ipv6/raw.c:424 > ipv6_raw_deliver net/ipv6/raw.c:224 [inline] > raw6_local_deliver+0x819/0xa80 net/ipv6/raw.c:240 > ip6_input_finish+0x3c7/0x17a0 net/ipv6/ip6_input.c:246 > NF_HOOK include/linux/netfilter.h:250 [inline] > ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 > dst_input include/net/dst.h:449 [inline] > ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 > NF_HOOK include/linux/netfilter.h:250 [inline] > ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 > __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4499 > __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4564 > process_backlog+0x203/0x740 net/core/dev.c:5244 > napi_poll net/core/dev.c:5642 [inline] > net_rx_action+0x792/0x1910 net/core/dev.c:5708 > __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 > run_ksoftirqd+0x50/0x100 kernel/softirq.c:666 > smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 > Code: d1 48 09 c1 0f ae e8 0f 31 48 c1 e2 20 48 09 d0 48 89 c2 48 29 ca 48 > 39 > Lost 40 message(s)! > rcu_sched kthread starved for 124900 jiffies! g240513 c240512 f0x0 > RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1 > rcu_sched I23456 8 2 0x80000000 > Call Trace: > context_switch kernel/sched/core.c:2799 [inline] > __schedule+0x8eb/0x2060 kernel/sched/core.c:3375 > schedule+0xf5/0x430 kernel/sched/core.c:3434 > schedule_timeout+0x118/0x230 kernel/time/timer.c:1795 > rcu_gp_kthread+0x9e5/0x1930 kernel/rcu/tree.c:2314 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 > 0-...!: (1 GPs behind) idle=c92/140000000000001/0 > softirq=414248/414250 fqs=23 > (t=126311 jiffies g=240513 c=240512 q=235) > rcu_sched kthread starved for 126214 jiffies! g240513 c240512 f0x2 > RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1 > rcu_sched R running task 23456 8 2 0x80000000 > Call Trace: > context_switch kernel/sched/core.c:2799 [inline] > __schedule+0x8eb/0x2060 kernel/sched/core.c:3375 > schedule+0xf5/0x430 kernel/sched/core.c:3434 > schedule_timeout+0x118/0x230 kernel/time/timer.c:1795 > rcu_gp_kthread+0x9e5/0x1930 kernel/rcu/tree.c:2314 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 > NMI backtrace for cpu 0 > CPU: 0 PID: 7 Comm: ksoftirqd/0 Not tainted 4.15.0-rc5+ #177 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Call Trace: > <IRQ> > __dump_stack lib/dump_stack.c:17 [inline] > dump_stack+0x194/0x257 lib/dump_stack.c:53 > nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 > nmi_trigger_cpumask_backtrace+0x122/0x180 lib/nmi_backtrace.c:62 > arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 > trigger_single_cpu_backtrace include/linux/nmi.h:156 [inline] > rcu_dump_cpu_stacks+0x186/0x1d9 kernel/rcu/tree.c:1459 > print_cpu_stall kernel/rcu/tree.c:1608 [inline] > check_cpu_stall.isra.61+0xbb8/0x15b0 kernel/rcu/tree.c:1676 > __rcu_pending kernel/rcu/tree.c:3440 [inline] > rcu_pending kernel/rcu/tree.c:3502 [inline] > rcu_check_callbacks+0x256/0xd00 kernel/rcu/tree.c:2842 > update_process_times+0x30/0x60 kernel/time/timer.c:1630 > tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 > tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1166 > __run_hrtimer kernel/time/hrtimer.c:1211 [inline] > __hrtimer_run_queues+0x358/0xe20 kernel/time/hrtimer.c:1275 > hrtimer_interrupt+0x1c2/0x5e0 kernel/time/hrtimer.c:1309 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] > smp_apic_timer_interrupt+0x14a/0x700 arch/x86/kernel/apic/apic.c:1050 > apic_timer_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:904 > </IRQ> > RIP: 0010:_decode_session6+0x555/0x1380 net/ipv6/xfrm6_policy.c:148 > RSP: 0018:ffff8801d9f3e590 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff11 > RAX: 1ffff1003a6418d0 RBX: ffff8801d320c5c0 RCX: ffff8801d320c684 > RDX: 0000000000000000 RSI: 000000000000fc89 RDI: ffff8801d320c644 > RBP: ffff8801d9f3e618 R08: ffffed0037a8a2a5 R09: ffffed0037a8a2a5 > R10: 000000000000000b R11: ffffed0037a8a2a4 R12: 000000000000fe61 > R13: ffff8801d9f3e8f0 R14: 000000000000fcb0 R15: dffffc0000000000 > __xfrm_decode_session+0x68/0x110 net/xfrm/xfrm_policy.c:2358 > __xfrm_policy_check+0x18c/0x2350 net/xfrm/xfrm_policy.c:2393 > __xfrm_policy_check2 include/net/xfrm.h:1170 [inline] > xfrm_policy_check include/net/xfrm.h:1175 [inline] > xfrm6_policy_check include/net/xfrm.h:1185 [inline] > rawv6_rcv+0x8f6/0x1200 net/ipv6/raw.c:424 > ipv6_raw_deliver net/ipv6/raw.c:224 [inline] > raw6_local_deliver+0x819/0xa80 net/ipv6/raw.c:240 > ip6_input_finish+0x3c7/0x17a0 net/ipv6/ip6_input.c:246 > NF_HOOK include/linux/netfilter.h:250 [inline] > ip6_input+0xe9/0x560 net/ipv6/ip6_input.c:327 > dst_input include/net/dst.h:449 [inline] > ip6_rcv_finish+0x1a9/0x7a0 net/ipv6/ip6_input.c:71 > NF_HOOK include/linux/netfilter.h:250 [inline] > ipv6_rcv+0xf37/0x1fa0 net/ipv6/ip6_input.c:208 > __netif_receive_skb_core+0x1a41/0x3460 net/core/dev.c:4499 > __netif_receive_skb+0x2c/0x1b0 net/core/dev.c:4564 > process_backlog+0x203/0x740 net/core/dev.c:5244 > napi_poll net/core/dev.c:5642 [inline] > net_rx_action+0x792/0x1910 net/core/dev.c:5708 > __do_softirq+0x2d7/0xb85 kernel/softirq.c:285 > run_ksoftirqd+0x50/0x100 kernel/softirq.c:666 > smpboot_thread_fn+0x450/0x7c0 kernel/smpboot.c:164 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:515 > INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.115 > msecs > > > --- > This bug is generated by a dumb bot. It may contain errors. > See https://goo.gl/tpsmEJ for details. > Direct all questions to syzkal...@googlegroups.com. > > syzbot will keep track of this bug report. > If you forgot to add the Reported-by tag, once the fix for this bug is > merged > into any tree, please reply to this email with: > #syz fix: exact-commit-title > To mark this as a duplicate of another syzbot report, please reply with: > #syz dup: exact-subject-of-another-report > If it's a one-off invalid bug report, please reply with: > #syz invalid > Note: if the crash happens again, it will cause creation of a new bug > report. > Note: all commands must start from beginning of the line in the email body. > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/001a113f6d56977f0b056505705a%40google.com. > For more options, visit https://groups.google.com/d/optout.
