Hello, syzbot found the following crash on: HEAD commit: ab8bba4e Add linux-next specific files for 20190326 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=147da22f200000 kernel config: https://syzkaller.appspot.com/x/.config?x=8b5e4ab01fbe59f3 dashboard link: https://syzkaller.appspot.com/bug?extid=c70685d9eac9589eaffc compiler: gcc (GCC) 9.0.0 20181231 (experimental) Unfortunately, I don't have any reproducer for this crash yet. IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+c70685d9eac9589eaffc@xxxxxxxxxxxxxxxxxxxxxxxxx protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 rcu: INFO: rcu_preempt self-detected stall on CPUrcu: 1-...!: (10499 ticks this GP) idle=4d6/1/0x4000000000000002 softirq=15531/15535 fqs=1
rcu: (t=10500 jiffies g=12661 q=236)rcu: rcu_preempt kthread starved for 10498 jiffies! g12661 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29176 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2877 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3518 schedule+0x92/0x180 kernel/sched/core.c:3562 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1971 [inline] rcu_gp_kthread+0x962/0x17b0 kernel/rcu/tree.c:2128 kthread+0x357/0x430 kernel/kthread.c:253 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1CPU: 1 PID: 10138 Comm: syz-executor.4 Not tainted 5.1.0-rc2-next-20190326 #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace: <IRQ> __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:164 [inline] rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1223 print_cpu_stall kernel/rcu/tree.c:1360 [inline] check_cpu_stall kernel/rcu/tree.c:1434 [inline] rcu_pending kernel/rcu/tree.c:3103 [inline] rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544 update_process_times+0x32/0x80 kernel/time/timer.c:1639 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1272 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x33e/0xde0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 </IRQ> RIP: 0010:bpf_prog_d4faa897062613d4+0x534/0x1000Code: cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 55 <48> 89 e5 48 81 ec 28 00 00 00 48 83 ed 28 48 89 5d 00 4c 89 6d 08
RSP: 0018:ffff88804e95fac0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: ffffffffa0008533 RBX: ffff88804e95fba8 RCX: ffffc9000e663000 RDX: 0000000000040000 RSI: ffffc90001965038 RDI: ffff88804e95fc68 RBP: ffff88804e95fbd0 R08: ffff888096eda6c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 00000000ffffffff R14: ffffc90001965000 R15: 0000000003d7c302 bpf_prog_test_run_xdp+0x24f/0x4c0 net/bpf/test_run.c:235 bpf_prog_test_run kernel/bpf/syscall.c:1969 [inline] __do_sys_bpf+0x15c2/0x3e50 kernel/bpf/syscall.c:2728 __se_sys_bpf kernel/bpf/syscall.c:2672 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2672 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x458209Code: ad b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f74d2a2dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458209 RDX: 0000000000000028 RSI: 0000000020000240 RDI: 000000000000000a RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f74d2a2e6d4 R13: 00000000004be3c5 R14: 00000000004cea20 R15: 00000000ffffffff net_ratelimit: 2 callbacks suppressed protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 protocol 88fb is buggy, dev hsr_slave_0 protocol 88fb is buggy, dev hsr_slave_1 --- This bug 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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