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Message-ID: <0000000000009f9349057e4915b4@google.com> Date: Sun, 30 Dec 2018 19:34:04 -0800 From: syzbot <syzbot+94683b47a87718b5dff7@...kaller.appspotmail.com> To: davem@...emloft.net, herbert@...dor.apana.org.au, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, steffen.klassert@...unet.com, syzkaller-bugs@...glegroups.com Subject: INFO: rcu detected stall in inet_dgram_connect Hello, syzbot found the following crash on: HEAD commit: f7d18ef6a95f Merge git://git.kernel.org/pub/scm/linux/kern.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=152cb86f400000 kernel config: https://syzkaller.appspot.com/x/.config?x=4b137b8ba637eb77 dashboard link: https://syzkaller.appspot.com/bug?extid=94683b47a87718b5dff7 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+94683b47a87718b5dff7@...kaller.appspotmail.com netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor4'. rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P23939 rcu: (detected by 1, t=10503 jiffies, g=56797, q=1404) syz-executor5 R running task 24952 23939 8064 0x00000006 Call Trace: <IRQ> sched_show_task.cold.86+0x2b6/0x30a kernel/sched/core.c:5293 rcu_print_detail_task_stall_rnp+0xc7/0x103 kernel/rcu/tree_plugin.h:690 rcu_print_detail_task_stall kernel/rcu/tree_plugin.h:703 [inline] print_other_cpu_stall.cold.69+0x5b5/0x8db kernel/rcu/tree.c:1289 check_cpu_stall kernel/rcu/tree.c:1429 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xfe8/0x1410 kernel/rcu/tree.c:2521 update_process_times+0x2d/0x70 kernel/time/timer.c:1635 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:161 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 </IRQ> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:94 Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 <55> 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 c8 47 RSP: 0018:ffff888065fa7458 EFLAGS: 00000217 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff86c5ddd8 RDX: 00000000ffffffff RSI: 000000000000227d RDI: 0000000000000004 RBP: ffff888065fa7718 R08: ffff8880a9eac700 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a9eac700 R12: 000000000000227d R13: dffffc0000000000 R14: ffff8880a86c8dc0 R15: 00000000ffffffff xfrm_policy_lookup+0x7e/0x80 net/xfrm/xfrm_policy.c:2145 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2939 [inline] xfrm_lookup_with_ifid+0x972/0x2b80 net/xfrm/xfrm_policy.c:3080 xfrm_lookup net/xfrm/xfrm_policy.c:3172 [inline] xfrm_lookup_route+0x3c/0x1f0 net/xfrm/xfrm_policy.c:3183 ip_route_output_flow+0xb1/0xc0 net/ipv4/route.c:2582 ip_route_connect include/net/route.h:309 [inline] __ip4_datagram_connect+0x70e/0x1330 net/ipv4/datagram.c:51 ip4_datagram_connect+0x2f/0x50 net/ipv4/datagram.c:92 inet_dgram_connect+0x154/0x2e0 net/ipv4/af_inet.c:571 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fee7c44bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000010 RSI: 0000000020593000 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fee7c44c6d4 R13: 00000000004be2ff R14: 00000000004ce440 R15: 00000000ffffffff syz-executor5 R running task 24952 23939 8064 0x8000000e Call Trace: <IRQ> sched_show_task.cold.86+0x2b6/0x30a kernel/sched/core.c:5293 rcu_print_detail_task_stall_rnp+0xc7/0x103 kernel/rcu/tree_plugin.h:690 rcu_print_detail_task_stall kernel/rcu/tree_plugin.h:705 [inline] print_other_cpu_stall.cold.69+0x615/0x8db kernel/rcu/tree.c:1289 check_cpu_stall kernel/rcu/tree.c:1429 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks+0xfe8/0x1410 kernel/rcu/tree.c:2521 update_process_times+0x2d/0x70 kernel/time/timer.c:1635 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:161 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1271 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline] smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 </IRQ> RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x50 kernel/kcov.c:94 Code: 14 dd 28 00 00 00 4d 39 d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 <55> 48 89 e5 48 8b 75 08 65 48 8b 04 25 40 ee 01 00 65 8b 15 c8 47 RSP: 0018:ffff888065fa7458 EFLAGS: 00000217 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 0000000000000000 RCX: ffffffff86c5ddd8 RDX: 00000000ffffffff RSI: 000000000000227d RDI: 0000000000000004 RBP: ffff888065fa7718 R08: ffff8880a9eac700 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880a9eac700 R12: 000000000000227d R13: dffffc0000000000 R14: ffff8880a86c8dc0 R15: 00000000ffffffff xfrm_policy_lookup+0x7e/0x80 net/xfrm/xfrm_policy.c:2145 xfrm_bundle_lookup net/xfrm/xfrm_policy.c:2939 [inline] xfrm_lookup_with_ifid+0x972/0x2b80 net/xfrm/xfrm_policy.c:3080 xfrm_lookup net/xfrm/xfrm_policy.c:3172 [inline] xfrm_lookup_route+0x3c/0x1f0 net/xfrm/xfrm_policy.c:3183 ip_route_output_flow+0xb1/0xc0 net/ipv4/route.c:2582 ip_route_connect include/net/route.h:309 [inline] __ip4_datagram_connect+0x70e/0x1330 net/ipv4/datagram.c:51 ip4_datagram_connect+0x2f/0x50 net/ipv4/datagram.c:92 inet_dgram_connect+0x154/0x2e0 net/ipv4/af_inet.c:571 __sys_connect+0x37d/0x4c0 net/socket.c:1664 __do_sys_connect net/socket.c:1675 [inline] __se_sys_connect net/socket.c:1672 [inline] __x64_sys_connect+0x73/0xb0 net/socket.c:1672 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fee7c44bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 0000000000000010 RSI: 0000000020593000 RDI: 0000000000000004 RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fee7c44c6d4 R13: 00000000004be2ff R14: 00000000004ce440 R15: 00000000ffffffff rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { P23939 } 10898 jiffies s: 5085 root: 0x0/T rcu: blocking rcu_node structures: --- 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@...glegroups.com. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with syzbot.
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