On Wed, Jan 2, 2019 at 6:02 PM syzbot <syzbot+14005fa30c9a07192...@syzkaller.appspotmail.com> wrote: > > syzbot has found a reproducer for the following crash on: > > HEAD commit: 4cd1b60def51 Add linux-next specific files for 20190102 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=12b12dbf400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3bf665f887bd3d7e > dashboard link: https://syzkaller.appspot.com/bug?extid=14005fa30c9a07192934 > compiler: gcc (GCC) 9.0.0 20181231 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10621f53400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=154d0427400000 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+14005fa30c9a07192...@syzkaller.appspotmail.com
Random manifestation of the stack overflow/corruption: #syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2 See https://groups.google.com/forum/#!msg/syzkaller-bugs/vr87kmG5qRI/31nOcuVsFgAJ > list_add corruption. next->prev should be prev (ffff8880ae72d8d8), but was > 0000000000000610. (next=ffff8880a94b64f0). > ------------[ cut here ]------------ > kernel BUG at lib/list_debug.c:23! > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > CPU: 1 PID: -1958513720 Comm: Not tainted 4.20.0-next-20190102 #2 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__list_add_valid.cold+0xf/0x3c lib/list_debug.c:23 > Code: 34 fe eb d5 4c 89 e7 e8 3a 82 34 fe eb a3 4c 89 f7 e8 30 82 34 fe e9 > 56 ff ff ff 4c 89 e1 48 c7 c7 40 98 81 88 e8 00 cb d6 fd <0f> 0b 48 89 f2 > 4c 89 e1 4c 89 ee 48 c7 c7 80 99 81 88 e8 e9 ca d6 > RSP: 0018:ffff8880ae707648 EFLAGS: 00010086 > RAX: 0000000000000075 RBX: ffff8880a4783cc0 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8167d786 RDI: ffffed1015ce0ebb > RBP: ffff8880ae707660 R08: 0000000000000075 R09: ffffed1015ce5021 > R10: ffffed1015ce5020 R11: ffff8880ae728107 R12: ffff8880a94b64f0 > R13: ffff8880a843a530 R14: ffff8880ae7076e8 R15: ffff8880a843a530 > FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000068 CR3: 00000000a43c7000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <IRQ> > __list_add include/linux/list.h:60 [inline] > list_add include/linux/list.h:79 [inline] > account_entity_enqueue+0x3a0/0x660 kernel/sched/fair.c:2678 > enqueue_entity+0x276/0x20b0 kernel/sched/fair.c:3902 > enqueue_task_fair+0x237/0x10c0 kernel/sched/fair.c:5133 > enqueue_task kernel/sched/core.c:730 [inline] > activate_task+0x11d/0x470 kernel/sched/core.c:751 > ttwu_activate kernel/sched/core.c:1643 [inline] > ttwu_do_activate+0xd4/0x1f0 kernel/sched/core.c:1702 > ttwu_queue kernel/sched/core.c:1847 [inline] > try_to_wake_up+0x997/0x1480 kernel/sched/core.c:2057 > wake_up_process+0x10/0x20 kernel/sched/core.c:2129 > hrtimer_wakeup+0x48/0x60 kernel/time/hrtimer.c:1637 > __run_hrtimer kernel/time/hrtimer.c:1389 [inline] > __hrtimer_run_queues+0x3a7/0x1050 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+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060 > apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 > </IRQ> > Modules linked in: > ---[ end trace 21a00246ce9209ce ]--- > RIP: 0010:__list_add_valid.cold+0xf/0x3c lib/list_debug.c:23 > Code: 34 fe eb d5 4c 89 e7 e8 3a 82 34 fe eb a3 4c 89 f7 e8 30 82 34 fe e9 > 56 ff ff ff 4c 89 e1 48 c7 c7 40 98 81 88 e8 00 cb d6 fd <0f> 0b 48 89 f2 > 4c 89 e1 4c 89 ee 48 c7 c7 80 99 81 88 e8 e9 ca d6 > RSP: 0018:ffff8880ae707648 EFLAGS: 00010086 > RAX: 0000000000000075 RBX: ffff8880a4783cc0 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: ffffffff8167d786 RDI: ffffed1015ce0ebb > RBP: ffff8880ae707660 R08: 0000000000000075 R09: ffffed1015ce5021 > R10: ffffed1015ce5020 R11: ffff8880ae728107 R12: ffff8880a94b64f0 > R13: ffff8880a843a530 R14: ffff8880ae7076e8 R15: ffff8880a843a530 > FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000000000068 CR3: 00000000a43c7000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > -- > 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/000000000000f9aaa5057e7c9ad5%40google.com. > For more options, visit https://groups.google.com/d/optout.
