On Mon, Feb 12, 2018 at 4:23 PM, syzbot <syzbot+7d03c810e50aaedef...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot hit the following crash on net-next commit > 9515a2e082f91457db0ecff4b65371d0fb5d9aad (Thu Jan 25 03:37:38 2018 +0000) > net/ipv4: Allow send to local broadcast from a socket bound to a VRF > > So far this crash happened 6 times on net-next. > 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+7d03c810e50aaedef...@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. > > INFO: rcu_sched self-detected stall on CPU > 1-...!: (124998 ticks this GP) idle=376/140000000000001/0 > softirq=506054/506054 fqs=19 > (t=125000 jiffies g=289415 c=289414 q=312) > rcu_sched kthread starved for 124920 jiffies! g289415 c289414 f0x0 > RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 > 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:1793 > rcu_gp_kthread+0x9e5/0x1930 kernel/rcu/tree.c:2314 > kthread+0x33c/0x400 kernel/kthread.c:238 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:541 > NMI backtrace for cpu 1 > CPU: 1 PID: 15893 Comm: syz-executor0 Not tainted 4.15.0-rc9+ #210 > 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:1628 > tick_sched_handle+0x85/0x160 kernel/time/tick-sched.c:162 > tick_sched_timer+0x42/0x120 kernel/time/tick-sched.c:1194 > __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:937 > </IRQ> > RIP: 0010:__read_once_size include/linux/compiler.h:183 [inline] > RIP: 0010:__sanitizer_cov_trace_pc+0x3b/0x50 kernel/kcov.c:106 > RSP: 0018:ffff8801a6867820 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff11 > RAX: 0000000000010000 RBX: ffff8801caf7d200 RCX: ffffffff84acc87d > RDX: 000000000000ffff RSI: ffffc90002aa6000 RDI: ffff8801c54c4f50 > RBP: ffff8801a6867820 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801c54c4e00 > R13: dffffc0000000000 R14: ffffed00395efa5f R15: ffff8801caf7d2fc > xfrm_get_dst_nexthop net/xfrm/xfrm_policy.c:2732 [inline] > xfrm_confirm_neigh+0xad/0x270 net/xfrm/xfrm_policy.c:2759 > dst_confirm_neigh include/net/dst.h:419 [inline] > raw_sendmsg+0xece/0x23b0 net/ipv4/raw.c:702 > inet_sendmsg+0x11f/0x5e0 net/ipv4/af_inet.c:764 > sock_sendmsg_nosec net/socket.c:630 [inline] > sock_sendmsg+0xca/0x110 net/socket.c:640 > SYSC_sendto+0x361/0x5c0 net/socket.c:1747 > SyS_sendto+0x40/0x50 net/socket.c:1715 > entry_SYSCALL_64_fastpath+0x29/0xa0 > RIP: 0033:0x452f19 > RSP: 002b:00007f00a389ec58 EFLAGS: 00000212 ORIG_RAX: 000000000000002c > RAX: ffffffffffffffda RBX: 000000000071bf58 RCX: 0000000000452f19 > RDX: 000000000000001e RSI: 0000000020098000 RDI: 0000000000000013 > RBP: 0000000000000510 R08: 0000000020cf9000 R09: 0000000000000010 > R10: fffffffffffffffe R11: 0000000000000212 R12: 00000000006f6a20 > R13: 00000000ffffffff R14: 00007f00a389f6d4 R15: 0000000000000001 > > > --- > 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/001a1141ba9ea381f70565057687%40google.com. > For more options, visit https://groups.google.com/d/optout.
