[Bug 20380] Heroes of Might and Magic III hangs

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=20380


Michael Builov <mbuilov at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |mbuilov at gmail.com




--- Comment #71 from Michael Builov <mbuilov at gmail.com>  2010-02-12 19:57:22 ---
finally, i found that the bug is in... ntdll.dll.so :)
It's because SIGUSR1 is not blocked in SIGSEGV handler.
I have attached gdb to Heroes3.exe and set two breakpoints: one at start of
usr1_handler (breakpoint 1), other - at start of segv_handler (breakpoint 5) in
dlls/ntdll/signal_i386.c.
Then i setup breakpoints to not stop, just to print registers and backtrace. 

And just before i get record in log
"0009:err:seh:setup_exception_record nested exception on signal stack in thread
0009 eip 7efb5800 esp 7ffdbc7c stack 0x242000-0x340000
0009: *killed* exit_code=0"

i see in debugger

Breakpoint 5, 0x7efb4e40 in ?? ()
eax            0xb      11
ecx            0x7ffdbd0c       2147335436
edx            0x7ffdbc8c       2147335308
ebx            0x7df8bc00       2113453056
esp            0x7ffdbc7c       0x7ffdbc7c
ebp            0x329db0 0x329db0
esi            0x1821d10        25304336
edi            0x1731d10        24321296
eip            0x7efb4e40       0x7efb4e40
eflags         0x200216 [ PF AF IF ID ]
cs             0x23     35
ss             0x2b     43
ds             0x2b     43
es             0x2b     43
fs             0x63     99
gs             0x6b     107
#0  0x7efb4e40 in ?? ()
#1  <signal handler called>
#2  0xf7549a4c in ?? ()
#3  0x7df379e7 in ?? ()
#4  0x01731d10 in ?? ()
#5  0x01821d10 in ?? ()
#6  0x000001f4 in ?? ()
#7  0x00000000 in ?? ()

Breakpoint 1, 0x7efb5800 in ?? ()
eax            0xa      10
ecx            0x7ffdbd0c       2147335436
edx            0x7ffdbc8c       2147335308
ebx            0x7df8bc00       2113453056
esp            0x7ffdbc7c       0x7ffdbc7c
ebp            0x329db0 0x329db0
esi            0x1821d10        25304336
edi            0x1731d10        24321296
eip            0x7efb5800       0x7efb5800
eflags         0x200216 [ PF AF IF ID ]
cs             0x23     35
ss             0x2b     43
ds             0x2b     43
es             0x2b     43
fs             0x63     99
gs             0x6b     107
#0  0x7efb5800 in ?? ()
#1  <signal handler called>
#2  0x7efb47e0 in ?? ()
#3  0xdeadbabe in ?? ()
#4  0x00329c3c in ?? ()
#5  0x00329970 in ?? ()
#6  0x0001003f in ?? ()
#7  0x00000000 in ?? ()

Breakpoint 5, 0x7efb4e40 in ?? ()
eax            0xb      11
ecx            0x7ffdbbfc       2147335164
edx            0x7ffdbb7c       2147335036
ebx            0x7df8bc00       2113453056
esp            0x7ffdbb6c       0x7ffdbb6c
ebp            0x329d00 0x329d00
esi            0x18b0880        25888896
edi            0x17c0880        24905856
eip            0x7efb4e40       0x7efb4e40
eflags         0x200212 [ AF IF ID ]
cs             0x23     35
ss             0x2b     43
ds             0x2b     43
es             0x2b     43
fs             0x63     99
gs             0x6b     107
#0  0x7efb4e40 in ?? ()
#1  <signal handler called>
#2  0x7efb5800 in ?? ()
#3  <signal handler called>
#4  0xf7549a4c in ?? ()
#5  0x7df379e7 in ?? ()
#6  0x017c0880 in ?? ()
#7  0x018b0880 in ?? ()
#8  0x00000458 in ?? ()
#9  0x00000000 in ?? ()
^C
Program exited with code 01.
(gdb)

Here first executed segv_handler, which changes registers, esp - one of them.
Next called usr1_handler, which interrupts segv_handler - you may see
0xdeadbabe in it's backtrace. First instruction of usr1_handler is "push ebp" -
which tries to store ebp to stack, but stack pointer esp now invalid.
This "push" generates another SIGSEGV - segv_handler called again and we get
"nested exception on signal stack".

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