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From: Olaf H. <ol...@ae...> - 2020-02-07 19:53:21
|
Am Wed, 5 Feb 2020 10:11:26 +0100 schrieb Olaf Hering <ol...@ae...>: > I will do so until this Friday. While I do have something that actually works with xen 4.13, it is not yet ready to submit. Olaf |
|
From: Paul F. <pj...@wa...> - 2020-02-07 15:57:25
|
> On 14 Mar 2019, at 19:16, Ed Maste <em...@fr...> wrote:
>
> On Thu, 14 Mar 2019 at 11:20, Tom Hughes <tom...@so...> wrote:
>>
>> commit 09566120e705d8831aaa7076b439d3ad90b78773
>> Author: Tom Hughes <to...@co...>
>> Date: Thu Mar 14 15:15:41 2019 +0000
>>
>> Suppress FSGSBASE flag from cpuid results
>>
>> We don't support {rd,wr}{fs,gs}base so we shouldn't say we do.
>
> Thanks, I have rebased the FreeBSD patch set on master now and the
> test results are consistent with earlier runs.
>
Hi
Since I have a bit of free time on my hands (one more week in theory), I’ve also been looking at the FreeBSD port of Valgrind.
Has any work been done on this since last March?
I now have FreeBSD 12.1 reinstalled with Phil Longstaff’s work plus a few of my changes. It seems to work at least for trivial tests - I haven’t yet tried running the regression tests.
At the moment there are 4 things that I see that I need to do
1. Rebase everything onto the main Valgrind development branch
2. I’ve noticed that there is a big issue with clang compiled executables. The problem is that the binaries have 3 PT_LOAD sections (ro, rx, rw) while GCC (and clang on Linux) only generates 2 (rw and rx). This is causing symtab loading to fail. This limits the usefulness somewhat.
3. There were a lot of syscall changes in FreeBSD 12, so I think that ‘configure’ needs to handle/define a freebsd_version variable.
4. There are still quite a few missing syscalls.
A+
Paul
|
|
From: Paul F. <pj...@wa...> - 2020-02-07 15:39:19
|
> On 19 Jan 2020, at 16:04, John Reiser <jr...@bi...> wrote: > >> ==== SB 2822 (evchecks 301498) [tid 1] 0x1005f5ecb __pthread_init+898 /usr/lib/system/libsystem_pthread.dylib+0xecb >> 0x1005F5ECB: call 0x1005FD7A6 >> 0x1005FD7A6: leaq 2759(%rip), %rcx >> 0x1005FD7AD: xorl %eax,%eax >> 0x1005FD7AF: movq %rcx,11002(%rip) >> 0x1005FD7B6: movq %rax,11043(%rip) >> 0x1005FD7BD: ud2 >> ==79936== valgrind: Unrecognised instruction at address 0x1005fd7bd. >> ==80006== at 0x1005FD7BD: __pthread_init.cold.2 (in /usr/lib/system/libsystem_pthread.dylib) > > The pthread library has detected an impossible situation regarding system calls, > and this is the calling sequence to report the fatal error to MacOS. > The bad emulation happened some time ago. > > See https://bugs.kde.org/show_bug.cgi?id=383723#c23 of 2.5 years ago where a similar ud2 > was found to result from an incomplete emulation of kevent_qos syscall. > > I’ve spent a good while looking at this and am still more or less scratching my head. Here’s what I’ve done. 1. Setup a macOS 10.14 Mojave VM, installed XCode and the same source. It builds and seems to work (at least for my minimal test). 2. Generate traces with —trace-syscalls=yes and --trace-flags=10000000 to see what sys calls and VEX are doing. Obviously there are tons of diffs between these two logs, PIDs and hex addresses to start with. However the logs aren’t enormously long - just 3807 lines on macOS 10,15. In the logs, I see 3 sections a. stat/open/mmap/vm_allocate/close to load all of the system .dylibs. The dylibs aren’t loaded in the same order, and macOS 10.15 has added one new one (feature flags). b. Another big chunk, this time in dyld and ImageLoader functions c. __libkernel_init, which is towards the end of the 10.15 log. I’ve mostly been looking in this part, though I’ve no reason to suppose that the previous two sections don’t contain the issue(s). One thing that I’ve seen in this last section is this on macOS 10,14 ==== SB 2625 (evchecks 343156) [tid 1] 0x1005f85d6 _setcontext+144 /usr/lib/system/libsystem_platform.dylib+0x75d6 Whilst the corresponding VEX output on 10.15 is ==== SB 2795 (evchecks 300971) [tid 1] 0x1005e862a _os_semaphore_wait.cold.1+110 /usr/lib/system/libsystem_platform.dylib+0x762a I’m not sure what is happening here. In both cases the offset is beyond the end of lib system_platform that I see from disassemby (0x756a and 0x75d4 respectively). These are the names of the last functions in the library. The last thing that I see before the failing call to pthread_init is a syscall to sysctl KERN_USRSTACK64 which seems to work OK. Any other suggestions? A+ Paul |