Messages in this thread | | | Date | Mon, 23 Apr 2018 01:24:01 -0700 | Subject | KMSAN: uninit-value in pppol2tp_connect | From | syzbot <> |
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Hello,
syzbot hit the following crash on https://github.com/google/kmsan.git/master commit a7f95e9c8a95e9fbb388c3999b61a17667cd3bbe (Sat Apr 21 13:50:22 2018 +0000) kmsan: disable assembly checksums syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=a70ac890b23b1bf29f5c
So far this crash happened 3 times on https://github.com/google/kmsan.git/master. C reproducer: https://syzkaller.appspot.com/x/repro.c?id=4946656566968320 syzkaller reproducer: https://syzkaller.appspot.com/x/repro.syz?id=5395971013869568 Raw console output: https://syzkaller.appspot.com/x/log.txt?id=5936570024591360 Kernel config: https://syzkaller.appspot.com/x/.config?id=328654897048964367 compiler: clang version 7.0.0 (trunk 329391)
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================================================================== BUG: KMSAN: uninit-value in pppol2tp_connect+0x258/0x1c50 net/l2tp/l2tp_ppp.c:622 CPU: 1 PID: 4524 Comm: syzkaller735385 Not tainted 4.16.0+ #85 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x185/0x1d0 lib/dump_stack.c:53 kmsan_report+0x142/0x240 mm/kmsan/kmsan.c:1067 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:683 pppol2tp_connect+0x258/0x1c50 net/l2tp/l2tp_ppp.c:622 SYSC_connect+0x41a/0x510 net/socket.c:1639 SyS_connect+0x54/0x80 net/socket.c:1620 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x445559 RSP: 002b:00007f0b96f0ddb8 EFLAGS: 00000246 ORIG_RAX: 000000000000002a RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445559 RDX: 0000000000000000 RSI: 0000000020000200 RDI: 0000000000000003 RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec2b0929f R14: 00007f0b96f0e9c0 R15: 0000000000000001
Local variable description: ----address@SYSC_connect Variable was created at: SYSC_connect+0x6f/0x510 net/socket.c:1622 SyS_connect+0x54/0x80 net/socket.c:1620 ==================================================================
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