Here's another backtrace:
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Program received signal SIGSEGV, Segmentation fault.
__memcpy_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:461
warning: 461 ../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S: No
such file or directory
(gdb) bt
#0 __memcpy_avx_unaligned_erms () at
../sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S:461
#1 0x000055555556b2dc in memcpy (__len=8192, __src=<optimized out>,
__dest=0x7fffffff9da0) at
/usr/include/x86_64-linux-gnu/bits/string_fortified.h:29
#2 netsec_read (nsc=0x5555555e2d00,
buffer=buffer@entry=0x7fffffff9da0 "uvwxyz.. Abcdefghijklmnopqrstuvwxyz..
Abcdefghijklmnopqrstuvwxyz.. Abcdefghijklmnopqrstuvwxyz..
Abcdefghijklmnopqrstuvwxyz.. Abcdefghijklmnopqrstuvwxyz..
Abcdefghijklmnopqrstuvwxyz.. Abcdefghijklmnopq"..., size=size@entry=8192,
errstr=errstr@entry=0x7fffffff9d80) at sbr/netsec.c:406
#3 0x000055555556060e in traverse (action=action@entry=0x55555555cd71
<pop_action>, closure=closure@entry=0x7fffffffbf40,
fmt=fmt@entry=0x55555557b4c1 "RETR %d")
at uip/popsbr.c:592
#4 0x0000555555560e2d in pop_retr (msgno=msgno@entry=1,
action=action@entry=0x55555555cd71 <pop_action>,
closure=closure@entry=0x7fffffffbf40) at uip/popsbr.c:560
#5 0x000055555555db7d in main (argc=<optimized out>, argv=<optimized out>) at
uip/inc.c:576
Here, in netsec_read, (int)nsc->ns_inbuflen is -6553.
I have worked on debugging this. At some point, the entire nsc
structure becomes garbage. I have not yet pinpointed where memory
gets corrupted.
On the way to total understanding, I found one problem unrelated to
this memory problem. In traverse(), "len" needs to be signed, or the
"if (len < 0)" test cannot detect an error return from netsec_read.
Meanwhile, has anyone tried my patch? Does it work for anyone other
than me, its author?
< Stephen
