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[Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test s
From: |
Peter Maydell |
Subject: |
[Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7 |
Date: |
Mon, 13 Nov 2017 14:28:28 -0000 |
The kernel syscall ABI is "returns negative-errno". In the target code,
if the libc ABI says "return -1 with errno set", it's the target libc
code's job to move the return value into the TLS errno variable and
return -1 from the library function. (Some target architectures have
slightly weird ABIs like SPARC's "sets the carry flag on syscall
failure" one; QEMU handles that kind of detail in the linux-user/main.c
code which calls do_syscall().)
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https://bugs.launchpad.net/bugs/1727737
Title:
qemu-arm stalls on a GCC sanitizer test since qemu-2.7
Status in QEMU:
Incomplete
Bug description:
Hi,
I have noticed that several GCC/sanitizer tests fail with timeout when
executed under QEMU.
After a bit of investigation, I have noticed that this worked with
qemu-2.7, and started failing with qemu-2.8, and still fails with
qemu-2.10.1
I'm attaching a tarball containing:
alloca_instruments_all_paddings.exe : the testcase, and the needed libs:
lib/librt.so.1
lib/libdl.so.2
lib/ld-linux-armhf.so.3
lib/libasan.so.5
lib/libc.so.6
lib/libgcc_s.so.1
lib/libpthread.so.0
lib/libm.so.6
To reproduce the problem:
$ qemu-arm -cpu any -R 0 -L $PWD $PWD/alloca_instruments_all_paddings.exe
returns in less than a second with qemu-2.7, and never with qemu-2.8
Using -d in_asm suggests that the program "almost" completes and qemu seems
to stall on:
0x40b6eb44: e08f4004 add r4, pc, r4
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- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Peter Maydell, 2017/11/06
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/06
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Peter Maydell, 2017/11/06
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/07
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/08
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Peter Maydell, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7,
Peter Maydell <=
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Peter Maydell, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Christophe Lyon, 2017/11/13
- [Qemu-devel] [Bug 1727737] Re: qemu-arm stalls on a GCC sanitizer test since qemu-2.7, Peter Maydell, 2017/11/13