On Fri, Jun 8, 2018 at 3:11 PM, syzbot <syzbot+f5066e369b2d5fff630f@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > Hello, > > syzbot found the following crash on: > > HEAD commit: 68abbe729567 Merge branch 'akpm' (patches from Andrew) > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=16f7cebf800000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e5a4673d4582131c > dashboard link: https://syzkaller.appspot.com/bug?extid=f5066e369b2d5fff630f > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=1191756f800000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=162236af800000 The reproducer suggests that this is in smc. +smc maintainers > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+f5066e369b2d5fff630f@xxxxxxxxxxxxxxxxxxxxxxxxx > > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > random: sshd: uninitialized urandom read (32 bytes read) > BUG: unable to handle kernel NULL pointer dereference at 0000000000000000 > PGD 1b51e5067 P4D 1b51e5067 PUD 1b508f067 PMD 0 > Oops: 0010 [#1] SMP KASAN > CPU: 1 PID: 4485 Comm: syz-executor452 Not tainted 4.17.0+ #90 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 01/01/2011 > RIP: 0010: (null) > Code: Bad RIP value. > RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805 > RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0 > RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006 > R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79 > R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58 > FS: 0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 00000001b5625000 CR4: 00000000001406e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > sock_poll+0x1d1/0x710 net/socket.c:1156 > vfs_poll+0x77/0x2a0 fs/select.c:40 > ep_item_poll.isra.15+0x2c1/0x390 fs/eventpoll.c:887 > ep_insert+0x6b8/0x1c00 fs/eventpoll.c:1459 > __do_sys_epoll_ctl fs/eventpoll.c:2113 [inline] > __se_sys_epoll_ctl fs/eventpoll.c:1999 [inline] > __x64_sys_epoll_ctl+0xef1/0x10f0 fs/eventpoll.c:1999 > do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x43fcc9 > Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 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 6b 45 00 00 c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007fff59e3a2f8 EFLAGS: 00000217 ORIG_RAX: 00000000000000e9 > RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fcc9 > RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000004 > RBP: 00000000006ca018 R08: 00000000004002c8 R09: 00000000004002c8 > R10: 0000000020000000 R11: 0000000000000217 R12: 00000000004015f0 > R13: 0000000000401680 R14: 0000000000000000 R15: 0000000000000000 > Modules linked in: > Dumping ftrace buffer: > (ftrace buffer empty) > CR2: 0000000000000000 > ---[ end trace 090a30b2125a99a3 ]--- > RIP: 0010: (null) > Code: Bad RIP value. > RSP: 0018:ffff8801b6f273a0 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: ffff8801b629b800 RCX: 1ffffffff10ea805 > RDX: ffff8801b6f27c00 RSI: ffff8801ae67a100 RDI: ffff8801b51feac0 > RBP: ffff8801b6f27510 R08: ffff8801b563cf78 R09: 0000000000000006 > R10: ffff8801b563c740 R11: 0000000000000000 R12: 1ffff10036de4e79 > R13: ffff8801b6f27c00 R14: ffff8801b629b812 R15: ffff8801b629bc58 > FS: 0000000001c2b880(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 00000001b5625000 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 syzkaller@xxxxxxxxxxxxxxxx. > > 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+unsubscribe@xxxxxxxxxxxxxxxx. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000b98577056e212120%40google.com. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
