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Date: Wed, 22 Dec 2010 16:43:43 +0300 From: Alexey Vlasov <renton@...ton.name> To: linux-kernel@...r.kernel.org Subject: 2.6.36.2 - loop on read /proc/net/tcp Hi. Has anyone seen such a bug at 2.6.36.2? # netstat -ntl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 81.176.228.2:60608 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:8099 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:8099 0.0.0.0:* LISTEN tcp 0 0 81.176.228.7:8099 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:8100 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:8100 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:8101 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:8101 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:20037 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:8102 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:8102 0.0.0.0:* LISTEN tcp 0 0 127.0.0.1:3399 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:20040 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:38985 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:873 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:20041 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:20042 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:3306 0.0.0.0:* LISTEN tcp 0 0 81.176.228.3:3306 0.0.0.0:* LISTEN tcp 0 0 81.176.228.2:3306 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:9099 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:9099 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:20043 0.0.0.0:* LISTEN tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:9100 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:9100 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:20044 0.0.0.0:* LISTEN tcp 0 0 81.176.228.5:33549 0.0.0.0:* LISTEN ... First 30 lines are ok but then go lines repeating in "eternal" loop: tcp 0 0 81.176.228.2:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.3:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.7:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.2:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.3:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.7:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.2:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.3:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.4:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.7:80 0.0.0.0:* LISTEN tcp 0 0 81.176.228.2:80 0.0.0.0:* LISTEN # cat /proc/net/tcp ... It can hang an hour or so. but not always actually. # i=0; while [ "$i" -lt "10" ]; do time wc -l /proc/net/tcp; let "i = $i + 1"; done 614782727 /proc/net/tcp real 18m42.066s user 0m12.620s sys 18m25.890s 19443 /proc/net/tcp real 0m0.040s user 0m0.000s sys 0m0.030s 19503 /proc/net/tcp real 0m0.040s sys 0m0.030s 19502 /proc/net/tcp real 0m0.041s user 0m0.000s sys 0m0.040s 28525 /proc/net/tcp real 0m0.059s user 0m0.000s sys 0m0.050s 19463 /proc/net/tcp real 0m0.048s user 0m0.000s sys 0m0.040s 19521 /proc/net/tcp real 0m0.040s user 0m0.000s sys 0m0.030s 54394 /proc/net/tcp real 0m0.104s user 0m0.000s sys 0m0.100s 19479 /proc/net/tcp real 0m0.040s user 0m0.000s sys 0m0.030s 19481 /proc/net/tcp real 0m0.040s user 0m0.000s sys 0m0.030s -- BRGDS. Alexey Vlasov. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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