Messages in this thread |  | | Date | Sat, 07 Apr 2018 11:13:01 -0700 | Subject | KMSAN: uninit-value in tipc_node_get_mtu | From | syzbot <> |
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Hello,
syzbot hit the following crash on https://github.com/google/kmsan.git/master commit e2ab7e8abba47a2f2698216258e5d8727ae58717 (Fri Apr 6 16:24:31 2018 +0000) kmsan: temporarily disable visitAsmInstruction() to help syzbot syzbot dashboard link: https://syzkaller.appspot.com/bug?extid=b0975ce9355b347c1546
So far this crash happened 14 times on https://github.com/google/kmsan.git/master. Unfortunately, I don't have any reproducer for this crash yet. Raw console output: https://syzkaller.appspot.com/x/log.txt?id=6058260943601664 Kernel config: https://syzkaller.appspot.com/x/.config?id=6627248707860932248 compiler: clang version 7.0.0 (trunk 329060) (llvm/trunk 329054)
IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+b0975ce9355b347c1546@syzkaller.appspotmail.com It will help syzbot understand when the bug is fixed. See footer for details. If you forward the report, please keep this part and the footer.
================================================================== BUG: KMSAN: uninit-value in tipc_node_find net/tipc/node.c:236 [inline] BUG: KMSAN: uninit-value in tipc_node_get_mtu+0x200/0x7a0 net/tipc/node.c:185 CPU: 1 PID: 5393 Comm: syz-executor0 Not tainted 4.16.0+ #81 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:676 tipc_node_find net/tipc/node.c:236 [inline] tipc_node_get_mtu+0x200/0x7a0 net/tipc/node.c:185 __tipc_sendmsg+0x1b32/0x41c0 net/tipc/socket.c:1364 tipc_sendmsg+0xeb/0x140 net/tipc/socket.c:1265 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg net/socket.c:640 [inline] ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046 __sys_sendmsg net/socket.c:2080 [inline] SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091 SyS_sendmsg+0x54/0x80 net/socket.c:2087 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455259 RSP: 002b:00007feeb8eb4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007feeb8eb56d4 RCX: 0000000000455259 RDX: 0000000000000000 RSI: 0000000020001840 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004cc R14: 00000000006fa3c0 R15: 0000000000000000
Local variable description: ----dnode@__tipc_sendmsg Variable was created at: __tipc_sendmsg+0x20c/0x41c0 net/tipc/socket.c:1272 tipc_sendmsg+0xeb/0x140 net/tipc/socket.c:1265 ================================================================== Kernel panic - not syncing: panic_on_warn set ...
CPU: 1 PID: 5393 Comm: syz-executor0 Tainted: G B 4.16.0+ #81 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 panic+0x39d/0x940 kernel/panic.c:183 kmsan_report+0x238/0x240 mm/kmsan/kmsan.c:1083 __msan_warning_32+0x6c/0xb0 mm/kmsan/kmsan_instr.c:676 tipc_node_find net/tipc/node.c:236 [inline] tipc_node_get_mtu+0x200/0x7a0 net/tipc/node.c:185 __tipc_sendmsg+0x1b32/0x41c0 net/tipc/socket.c:1364 tipc_sendmsg+0xeb/0x140 net/tipc/socket.c:1265 sock_sendmsg_nosec net/socket.c:630 [inline] sock_sendmsg net/socket.c:640 [inline] ___sys_sendmsg+0xec0/0x1310 net/socket.c:2046 __sys_sendmsg net/socket.c:2080 [inline] SYSC_sendmsg+0x2a3/0x3d0 net/socket.c:2091 SyS_sendmsg+0x54/0x80 net/socket.c:2087 do_syscall_64+0x309/0x430 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x3d/0xa2 RIP: 0033:0x455259 RSP: 002b:00007feeb8eb4c68 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007feeb8eb56d4 RCX: 0000000000455259 RDX: 0000000000000000 RSI: 0000000020001840 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004cc R14: 00000000006fa3c0 R15: 0000000000000000 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..
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