On Tue, Nov 27, 2018 at 4:20 PM, syzbot <syzbot+d3bf6aae26942dc9c...@syzkaller.appspotmail.com> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 4bffc669d624 net: remove unsafe skb_insert() > git tree: net-next > console output: https://syzkaller.appspot.com/x/log.txt?x=1385db83400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c36a72af2123e78a > dashboard link: https://syzkaller.appspot.com/bug?extid=d3bf6aae26942dc9c8dc > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=107b426d400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11b2e533400000
>From reproducer it looks like something network related. So +netdev. This also happened on net-next and there seems to be several memory- corruption-looking crashes on net-next. > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+d3bf6aae26942dc9c...@syzkaller.appspotmail.com > > DEBUG_LOCKS_WARN_ON(!hlock->nest_lock) > ------------[ cut here ]------------ > Bad or missing usercopy whitelist? Kernel memory overwrite attempt detected > to SLAB object 'task_struct' (offset 1432, size 2)! > ================================================================== > ------------[ cut here ]------------ > BUG: KASAN: out-of-bounds in calc_delta_fair kernel/sched/fair.c:630 > [inline] > BUG: KASAN: out-of-bounds in update_curr+0x9c0/0xbd0 kernel/sched/fair.c:824 > kernel BUG at mm/slab.c:4425! > Read of size 8 at addr ffff8881d9b4a4c0 by task ksoftirqd/0/9 > invalid opcode: 0000 [#1] PREEMPT SMP KASAN > > CPU: 1 PID: 38 Comm: ���ف���d ������ Not tainted 4.20.0-rc3+ #314 > CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 4.20.0-rc3+ #314 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010:__check_heap_object+0xa7/0xb5 mm/slab.c:4450 > Call Trace: > Code: 48 c7 c7 5d df 14 89 e8 97 e3 0a 00 5d c3 41 8b 91 04 01 00 00 48 29 > c7 48 39 d7 77 be 48 01 d0 48 29 c8 48 39 f0 72 b3 5d c3 <0f> 0b 48 c7 c7 5d > df 14 89 e8 fd eb 0a 00 44 89 e9 48 c7 c7 18 e0 > __dump_stack lib/dump_stack.c:77 [inline] > dump_stack+0x244/0x39d lib/dump_stack.c:113 > RSP: 0018:ffff8881d9b49ea8 EFLAGS: 00010093 > RAX: 00000000000a57eb RBX: 1ffff1103b3693dc RCX: 000000000000000c > RDX: ffff8881d9b4a440 RSI: 0000000000000001 RDI: ffff8881d9b4a088 > RBP: ffff8881d9b49ea8 R08: ffff8881d9b4a440 R09: ffff8881da970180 > print_address_description.cold.7+0x9/0x1ff mm/kasan/report.c:256 > R10: 000000004afd68ef R11: 0000000000000000 R12: ffff8881d9b4a088 > kasan_report_error mm/kasan/report.c:354 [inline] > kasan_report.cold.8+0x242/0x309 mm/kasan/report.c:412 > R13: 0000000000000001 R14: ffffea000766d280 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 > __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:433 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > calc_delta_fair kernel/sched/fair.c:630 [inline] > update_curr+0x9c0/0xbd0 kernel/sched/fair.c:824 > CR2: 0000000cffc5fa18 CR3: 00000001bfadf000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > Modules linked in: > ---[ end trace 04af116ff405efee ]--- > RIP: 0010:__check_heap_object+0xa7/0xb5 mm/slab.c:4450 > Code: 48 c7 c7 5d df 14 89 e8 97 e3 0a 00 5d c3 41 8b 91 04 01 00 00 48 29 > c7 48 39 d7 77 be 48 01 d0 48 29 c8 48 39 f0 72 b3 5d c3 <0f> 0b 48 c7 c7 5d > df 14 89 e8 fd eb 0a 00 44 89 e9 48 c7 c7 18 e0 > RSP: 0018:ffff8881d9b49ea8 EFLAGS: 00010093 > RAX: 00000000000a57eb RBX: 1ffff1103b3693dc RCX: 000000000000000c > enqueue_entity+0x3f5/0x20a0 kernel/sched/fair.c:3871 > RDX: ffff8881d9b4a440 RSI: 0000000000000001 RDI: ffff8881d9b4a088 > RBP: ffff8881d9b49ea8 R08: ffff8881d9b4a440 R09: ffff8881da970180 > R10: 000000004afd68ef R11: 0000000000000000 R12: ffff8881d9b4a088 > R13: 0000000000000001 R14: ffffea000766d280 R15: 0000000000000001 > FS: 0000000000000000(0000) GS:ffff8881daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000cffc5fa18 CR3: 00000001bfadf000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > > > --- > 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 syzkal...@googlegroups.com. > > syzbot will keep track of this bug report. See: > https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with > syzbot. > syzbot can test patches for this bug, for details see: > https://goo.gl/tpsmEJ#testing-patches > > -- > 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/000000000000e10044057ba6fbcf%40google.com. > For more options, visit https://groups.google.com/d/optout.
