https://bz.apache.org/bugzilla/show_bug.cgi?id=58307
Bug ID: 58307
Summary: Segmentation fault in child in "read(__nbytes, __buf,
__fd) at
/usr/include/x86_64-linux-gnu/bits/unistd.h:44"
Product: Apache httpd-2
Version: 2.4.10
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Core
Assignee: [email protected]
Reporter: [email protected]
I am running Apache 2.4.10 (Debian Jessie) with dav and davfs module. My client
program tries to PUT a series of files and at some point Apache crashes during
a read-syscall.
More precisely, the client tries to put 32768 files each with 4k bytes of
random binary data. The files are enumerated from 00/00.bin through 07/ff.bin,
this means the PUT requests are "PUT /webdav/00/00.bin" up to "PUT
/webdav/07/ff.bin" whereby "/webdav" is the directory that is managed by the
davfs module. The directory and all subdirectories (00 to 7f) already exist.
The back trace of the Apache process from a core dump is:
#0 0x00007f28f0fcdadd in read () at ../sysdeps/unix/syscall-template.S:81
#1 0x000056342357a9b7 in read (__nbytes=1, __buf=0x7ffef51cfd83,
__fd=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/unistd.h:44
#2 ap_mpm_podx_check (pod=<optimized out>) at mpm_unix.c:535
#3 0x00007f28edcb3524 in child_main (child_num_arg=0) at event.c:2262
#4 0x00007f28edcb7cbd in make_child (s=0x7f28f1a9ede0, slot=0) at event.c:2349
#5 0x00007f28edcb7d45 in startup_children (number_to_start=1) at event.c:2375
#6 0x00007f28edcb877e in event_run (_pconf=0x5, plog=0x7f28f1a9a028,
s=0x7f28f1a9ede0) at event.c:2715
#7 0x0000563423553e7e in ap_run_mpm (pconf=0x7f28f1ac6028,
plog=0x7f28f1a9a028, s=0x7f28f1a9ede0) at mpm_common.c:94
#8 0x000056342354d3c3 in main (argc=3, argv=0x7ffef51d01b8) at main.c:777
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