* Re: [Bugme-new] [Bug 15273] New: Regression in ptrace (Wine) starting with 2.6.33-rc1
[not found] ` <bug-15273-10286-V0hAGp6uBxO456/isadD/XN4h3HLQggn@public.gmane.org/>
@ 2010-02-12 6:20 ` Andrew Morton
[not found] ` <20100211222058.321448c0.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Morton @ 2010-02-12 6:20 UTC (permalink / raw)
To: Rafael J. Wysocki, Maciej Rutecki
Cc: kernel-testers-u79uwXL29TY76Z2rM5mHXA, Frederic Weisbecker,
Ingo Molnar
post-2.6.32 rerression.
On Thu, 11 Feb 2010 16:21:38 GMT bugzilla-daemon-590EEB7GvNiWaY/ihj7yzEB+6BGkLq7r@public.gmane.org wrote:
> http://bugzilla.kernel.org/show_bug.cgi?id=15273
>
> URL: http://git.kernel.org/?p=linux/kernel/git/torvalds/lin
> ux-2.6.git;a=commit;h=72f674d203cd230426437cdcf7dd6f68
> 1dad8b0d
> Summary: Regression in ptrace (Wine) starting with 2.6.33-rc1
> Product: Process Management
> Version: 2.5
> Kernel Version: 2.6.33-rc
> Platform: All
> OS/Version: Linux
> Tree: Mainline
> Status: NEW
> Severity: high
> Priority: P1
> Component: Other
> AssignedTo: process_other-ztI5WcYan/vQLgFONoPN62D2FQJk+8+b@public.gmane.org
> ReportedBy: mstefani-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org
> Regression: Yes
>
>
> 2.6.33-rc1 broke ptrace for Wine, specifically the setting of the debug
> registers. This is visible in the Wine ntdll exception tests failing on
> 2.6.33-rcX while they work just fine in 2.6.32.
>
> A regression test resulted in:
> 72f674d203cd230426437cdcf7dd6f681dad8b0d is the first bad commit
> commit 72f674d203cd230426437cdcf7dd6f681dad8b0d
> Author: K.Prasad <prasad-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
> Date: Mon Jun 1 23:45:48 2009 +0530
>
> hw-breakpoints: modify Ptrace routines to access breakpoint registers
>
> This patch modifies the ptrace code to use the new wrapper routines around
> the
> debug/breakpoint registers.
>
> [ Impact: adapt x86 ptrace to the new breakpoint Api ]
>
> Original-patch-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
> Signed-off-by: K.Prasad <prasad-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
> Signed-off-by: Maneesh Soni <maneesh-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>
> Reviewed-by: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
> Signed-off-by: Frederic Weisbecker <fweisbec-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
>
> :040000 040000 f72ff4760c3fa1dffcd72494e77bee2c76039505
> b60d5fe2088ff635568e800d5759a0b373b5e439 M arch
>
>
> The first ntdll exception test in test_exceptions()
> http://source.winehq.org/git/wine.git/?a=blob;f=dlls/ntdll/tests/exception.c;h=9149b6961764dec31a0af5cd3b93ab3072703dbb;hb=312e4f6b235a468f8bf764101a5b97cf34dd4143#l594
> run_exception_test(dreg_handler, NULL, &segfault_code, sizeof(segfault_code),
> 0);
> produces (make exception.ok) the output:
> err:seh:setup_exception_record stack overflow 932 bytes in thread 0009 eip
> 7bc3c97f esp 00240f8c stack 0x240000-0x241000-0x340000
> The stack overflow is detected by the ntdll internal function
> setup_exception_record()
> http://source.winehq.org/git/wine.git/?a=blob;f=dlls/ntdll/signal_i386.c;h=4eccb61954c43d75144575411313d59405decfc3;hb=312e4f6b235a468f8bf764101a5b97cf34dd4143#l1495
> which aborts the thread.
> The problem happens on both i386 (Intel Atom CPU) as well as on x86_64 (Intel
> Q9450); the stack overflow bytes differ though but are always the same for each
> box.
>
> All the ntdll exception tests run just fine with 2.6.32 and older kernels. For
> a summary of the ntdll exception tests please see
> http://test.winehq.org/data/tests/ntdll:exception.html in the Wine column.
>
> thanks
> bye
> michael
>
> --
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