Comment #16 on issue 99 by [email protected]: Memcached 1.4.2 server
segmentation fault
http://code.google.com/p/memcached/issues/detail?id=99
Hi,
Thank you for checking in, and yes, I am still watching this ticket as it
still continues to be an issue for me. I manually apply my patch on every
upgrade to eliminate the "Segmentation fault". The patched memcached runs
indefinitely until it is manually restarted after a version upgrade (months
at a time).
Here is the information you requested:
memcached: 1.4.6-rc1
OS: linux 32 bit
libevent: 2.0.12
gcc: 4.4.4-r2
kernel: 2.6.30-r8
I did a default build of memcached from the source downloaded from the
memcached repository. I was able to get a SIGSEGV from a single request
using the same test script included with the original bug filing (using a
new size of 524288):
./memcached -l localhost -vvv
slab class 1: chunk size 80 perslab 13107
slab class 2: chunk size 104 perslab 10082
slab class 3: chunk size 136 perslab 7710
slab class 4: chunk size 176 perslab 5957
slab class 5: chunk size 224 perslab 4681
slab class 6: chunk size 280 perslab 3744
slab class 7: chunk size 352 perslab 2978
slab class 8: chunk size 440 perslab 2383
slab class 9: chunk size 552 perslab 1899
slab class 10: chunk size 696 perslab 1506
slab class 11: chunk size 872 perslab 1202
slab class 12: chunk size 1096 perslab 956
slab class 13: chunk size 1376 perslab 762
slab class 14: chunk size 1720 perslab 609
slab class 15: chunk size 2152 perslab 487
slab class 16: chunk size 2696 perslab 388
slab class 17: chunk size 3376 perslab 310
slab class 18: chunk size 4224 perslab 248
slab class 19: chunk size 5280 perslab 198
slab class 20: chunk size 6600 perslab 158
slab class 21: chunk size 8256 perslab 127
slab class 22: chunk size 10320 perslab 101
slab class 23: chunk size 12904 perslab 81
slab class 24: chunk size 16136 perslab 64
slab class 25: chunk size 20176 perslab 51
slab class 26: chunk size 25224 perslab 41
slab class 27: chunk size 31536 perslab 33
slab class 28: chunk size 39424 perslab 26
slab class 29: chunk size 49280 perslab 21
slab class 30: chunk size 61600 perslab 17
slab class 31: chunk size 77000 perslab 13
slab class 32: chunk size 96256 perslab 10
slab class 33: chunk size 120320 perslab 8
slab class 34: chunk size 150400 perslab 6
slab class 35: chunk size 188000 perslab 5
slab class 36: chunk size 235000 perslab 4
slab class 37: chunk size 293752 perslab 3
slab class 38: chunk size 367192 perslab 2
slab class 39: chunk size 458992 perslab 2
slab class 40: chunk size 573744 perslab 1
slab class 41: chunk size 717184 perslab 1
slab class 42: chunk size 1048576 perslab 1
<31 server listening (auto-negotiate)
<32 send buffer was 107520, now 268435456
<32 server listening (udp)
<32 server listening (udp)
<32 server listening (udp)
<32 server listening (udp)
<33 new auto-negotiating client connection
33: going from conn_new_cmd to conn_waiting
33: going from conn_waiting to conn_read
33: going from conn_read to conn_parse_cmd
33: Client using the ascii protocol
<33 set test 0 10 524288
33: going from conn_parse_cmd to conn_nread
NOT FOUND test
33 STORED
33: going from conn_nread to conn_write
33: going from conn_write to conn_new_cmd
33: going from conn_new_cmd to conn_waiting
33: going from conn_waiting to conn_read
<34 new auto-negotiating client connection
33: going from conn_read to conn_closing
<33 connection closed.
34: going from conn_new_cmd to conn_waiting
34: going from conn_waiting to conn_read
34: going from conn_read to conn_parse_cmd
34: Client using the ascii protocol
<34 get test
FOUND KEY test
34 sending key test
34 END
34: going from conn_parse_cmd to conn_mwrite
Segmentation fault
---
After doing a clean build using the same patch file I provided you, the
daemon seems to be stable again (100 successful requests using the same
test script). Thanks for looking into this once more, and let me know if
you need additional information.
thom
