On Wed, May 16, 2018 at 5:29 PM, syzbot <syzbot+769a7ccbbb4b5074f125@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 0b7d9978406f Merge branch 'Microsemi-Ocelot-Ethernet-switc.. > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1138c477800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=b632d8e2c2ab2c1 > dashboard link: https://syzkaller.appspot.com/bug?extid=769a7ccbbb4b5074f125 > compiler: gcc (GCC) 8.0.1 20180413 (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+769a7ccbbb4b5074f125@xxxxxxxxxxxxxxxxxxxxxxxxx > > netlink: 4 bytes leftover after parsing attributes in process > `syz-executor2'. > random: crng init done > INFO: rcu_sched self-detected stall on CPU > 1-...!: (121515 ticks this GP) idle=e7e/1/4611686018427387908 > softirq=31362/31362 fqs=7 > (t=125000 jiffies g=16439 c=16438 q=668508) > rcu_sched kthread starved for 124958 jiffies! g16439 c16438 f0x2 > RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0 > RCU grace-period kthread stack dump: > rcu_sched R running task 23768 9 2 0x80000000 > Call Trace: > context_switch kernel/sched/core.c:2848 [inline] > __schedule+0x801/0x1e30 kernel/sched/core.c:3490 > schedule+0xef/0x430 kernel/sched/core.c:3549 > schedule_timeout+0x138/0x240 kernel/time/timer.c:1801 > rcu_gp_kthread+0x6b5/0x1940 kernel/rcu/tree.c:2231 > kthread+0x345/0x410 kernel/kthread.c:238 > ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 > NMI backtrace for cpu 1 > CPU: 1 PID: 4488 Comm: syz-fuzzer Not tainted 4.17.0-rc4+ #45 > 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+0x1b9/0x294 lib/dump_stack.c:113 > nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 > nmi_trigger_cpumask_backtrace+0x151/0x192 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+0x175/0x1c2 kernel/rcu/tree.c:1376 > print_cpu_stall kernel/rcu/tree.c:1525 [inline] > check_cpu_stall.isra.61.cold.80+0x36c/0x59a kernel/rcu/tree.c:1593 > __rcu_pending kernel/rcu/tree.c:3356 [inline] > rcu_pending kernel/rcu/tree.c:3401 [inline] > rcu_check_callbacks+0x21b/0xad0 kernel/rcu/tree.c:2763 > update_process_times+0x2d/0x70 kernel/time/timer.c:1636 > tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164 > tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274 > __run_hrtimer kernel/time/hrtimer.c:1398 [inline] > __hrtimer_run_queues+0x3e3/0x10a0 kernel/time/hrtimer.c:1460 > hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518 > local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1025 [inline] > smp_apic_timer_interrupt+0x15d/0x710 arch/x86/kernel/apic/apic.c:1050 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > RIP: 0010:rcu_is_watching+0x6/0x140 kernel/rcu/tree.c:1071 > RSP: 0000:ffff8801daf06620 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 > RAX: ffff8801ad526240 RBX: 0000000000000000 RCX: ffffffff86444456 > RDX: 0000000000000100 RSI: ffffffff864444b8 RDI: 0000000000000001 > RBP: ffff8801daf06628 R08: ffff8801ad526240 R09: 0000000000000002 > R10: ffff8801ad526240 R11: 0000000000000000 R12: 1ffff1003b5e0cca > R13: ffff88008ff1a100 R14: 0000000000000000 R15: ffff8801daf066d0 > rcu_read_unlock include/linux/rcupdate.h:684 [inline] > ip_route_output_key_hash+0x2cd/0x390 net/ipv4/route.c:2303 > __ip_route_output_key include/net/route.h:124 [inline] > ip_route_output_flow+0x28/0xc0 net/ipv4/route.c:2557 > ip_route_output_key include/net/route.h:134 [inline] > sctp_v4_get_dst+0x50e/0x17a0 net/sctp/protocol.c:447 > sctp_transport_route+0x132/0x360 net/sctp/transport.c:303 > sctp_packet_config+0x926/0xdd0 net/sctp/output.c:118 > sctp_outq_select_transport+0x2bb/0x9c0 net/sctp/outqueue.c:877 > sctp_outq_flush_ctrl.constprop.12+0x2ad/0xe60 net/sctp/outqueue.c:911 > sctp_outq_flush+0x2ef/0x3430 net/sctp/outqueue.c:1203 > sctp_outq_uncork+0x6a/0x80 net/sctp/outqueue.c:776 > sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1820 [inline] > sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] > sctp_do_sm+0x596/0x7160 net/sctp/sm_sideeffect.c:1191 > sctp_generate_heartbeat_event+0x218/0x450 net/sctp/sm_sideeffect.c:406 #syz fix: sctp: not allow to set rto_min with a value below 200 msecs > call_timer_fn+0x230/0x940 kernel/time/timer.c:1326 > expire_timers kernel/time/timer.c:1363 [inline] > __run_timers+0x79e/0xc50 kernel/time/timer.c:1666 > run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692 > __do_softirq+0x2e0/0xaf5 kernel/softirq.c:285 > invoke_softirq kernel/softirq.c:365 [inline] > irq_exit+0x1d1/0x200 kernel/softirq.c:405 > exiting_irq arch/x86/include/asm/apic.h:525 [inline] > smp_apic_timer_interrupt+0x17e/0x710 arch/x86/kernel/apic/apic.c:1052 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863 > </IRQ> > RIP: 0033:0x40b55d > RSP: 002b:000000c424bedca8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 > RAX: 000000c4244e5470 RBX: 000000004d36768c RCX: 0000000000000000 > RDX: 000000c4244e5470 RSI: 000000000000ffff RDI: 0000000000000000 > RBP: 000000c424bedcc0 R08: 0000000000000000 R09: 0000000000000000 > R10: 00000000009466f2 R11: 0000000000000004 R12: 0000000000000000 > R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000034 > BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 125s! > BUG: workqueue lockup - pool cpus=0-1 flags=0x4 nice=0 stuck for 125s! > Showing busy workqueues and worker pools: > workqueue events: flags=0x0 > pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=3/256 > in-flight: 2104:do_numa_crng_init > pending: drbg_async_seed, cache_reap > pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=9/256 > pending: defense_work_handler, defense_work_handler, > defense_work_handler, defense_work_handler, defense_work_handler, > defense_work_handler, check_corruption, vmstat_shepherd, cache_reap > workqueue events_power_efficient: flags=0x80 > pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 > pending: do_cache_clean > pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=2/256 > pending: check_lifetime, gc_worker > workqueue writeback: flags=0x4e > pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 > in-flight: 6:wb_workfn > workqueue ipv6_addrconf: flags=0x40008 > pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 > pending: addrconf_verify_work > workqueue krdsd: flags=0xe000a > pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/1 > in-flight: 43:rds_connect_worker > pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=0s workers=4 idle: 24 1980 18 > pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=7 idle: 22 8018 287 6751 > 89 > > > --- > 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#bug-status-tracking for how to communicate with > syzbot. > > -- > 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+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000e2e064056c5460e3%40google.com. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
