Messages in this thread | | | Date | Sun, 06 Jun 2004 14:34:27 +0900 | From | Kalin KOZHUHAROV <> | Subject | Re: clone() <-> getpid() bug in 2.6? |
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Chris Wedgwood wrote: > On Sun, Jun 06, 2004 at 02:08:52PM +0900, Kalin KOZHUHAROV wrote: > > >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 >>[pid 13097] getpid() = 13097 > > > is this repeartable? if you strace -tt how often is this? Yes, definately on this system. Here we go:
poi root # strace -tt -f -F -p 3550 Process 3550 attached - interrupt to quit 14:24:31.589227 accept(3, {sa_family=AF_INET, sin_port=htons(40575), sin_addr=inet_addr("192.168.1.20")}, [16]) = 0 14:25:04.068649 rt_sigprocmask(SIG_BLOCK, [CHLD], NULL, 8) = 0 14:25:04.068898 write(2, "tcpserver: status: 1/40\n", 24) = 24 14:25:04.069229 fork(Process 14320 attached ) = 14320 [pid 3550] 14:25:04.069663 close(0 <unfinished ...> [pid 14320] 14:25:04.069771 close(3 <unfinished ...> [pid 3550] 14:25:04.069874 <... close resumed> ) = 0 [pid 3550] 14:25:04.069977 rt_sigprocmask(SIG_UNBLOCK, [CHLD], NULL, 8) = 0 [pid 3550] 14:25:04.070169 accept(3, <unfinished ...> [pid 14320] 14:25:04.070278 <... close resumed> ) = 0 [pid 14320] 14:25:04.070406 getpid() = 14320 [pid 14320] 14:25:04.070614 write(2, "tcpserver: pid 14320 from 192.16"..., 39) = 39 ... [pid 14320] 14:25:04.139116 close(3) = 0 [pid 14320] 14:25:04.139242 close(6) = 0 [pid 14320] 14:25:04.139350 time(NULL) = 1086499504 [pid 14320] 14:25:04.139516 getpid() = 14320 [pid 14320] 14:25:04.139742 read(0, "\26\3\1\0s\1\0\0o\3\1", 11) = 11 [pid 14320] 14:25:04.139910 time(NULL) = 1086499504 [pid 14320] 14:25:04.140017 getpid() = 14320 [pid 14320] 14:25:04.140125 read(0, "\0?\230A\323\323\304\226\v\37NI\310\3634i\375\346\300p"..., 109) = 109 [pid 14320] 14:25:04.140278 time(NULL) = 1086499504 [pid 14320] 14:25:04.140383 getpid() = 14320 [pid 14320] 14:25:04.140475 getpid() = 14320 [pid 14320] 14:25:04.140584 getpid() = 14320 [pid 14320] 14:25:04.140681 open("/dev/urandom", O_RDONLY|O_NONBLOCK|O_NOCTTY) = 3 [pid 14320] 14:25:04.140811 select(4, [3], NULL, NULL, {0, 10000}) = 1 (in [3], left {0, 10000}) [pid 14320] 14:25:04.140972 read(3, "g\t\270X\304\260\17P\'\367\t\"\253\375\24\350\272\240\327"..., 32) = 32 [pid 14320] 14:25:04.141130 close(3) = 0 [pid 14320] 14:25:04.141224 getpid() = 14320 [pid 14320] 14:25:04.141326 getpid() = 14320 [pid 14320] 14:25:04.141435 getuid32() = 89 [pid 14320] 14:25:04.141531 getpid() = 14320 [pid 14320] 14:25:04.141650 time(NULL) = 1086499504 [pid 14320] 14:25:04.141747 getpid() = 14320 [pid 14320] 14:25:04.141846 getpid() = 14320 [pid 14320] 14:25:04.141949 getpid() = 14320 [pid 14320] 14:25:04.142051 getpid() = 14320 [pid 14320] 14:25:04.142153 getpid() = 14320 [pid 14320] 14:25:04.142257 getpid() = 14320 [pid 14320] 14:25:04.142359 getpid() = 14320 [pid 14320] 14:25:04.142461 getpid() = 14320 [pid 14320] 14:25:04.142580 getpid() = 14320 [pid 14320] 14:25:04.142683 getpid() = 14320 [pid 14320] 14:25:04.142784 getpid() = 14320 [pid 14320] 14:25:04.142886 getpid() = 14320 [pid 14320] 14:25:04.142989 getpid() = 14320 [pid 14320] 14:25:04.143090 getpid() = 14320 [pid 14320] 14:25:04.143192 getpid() = 14320 [pid 14320] 14:25:04.143294 getpid() = 14320 [pid 14320] 14:25:04.143396 getpid() = 14320 [pid 14320] 14:25:04.143499 getpid() = 14320 [pid 14320] 14:25:04.143619 getpid() = 14320 [pid 14320] 14:25:04.143722 getpid() = 14320 [pid 14320] 14:25:04.143824 getpid() = 14320 [pid 14320] 14:25:04.143927 getpid() = 14320 [pid 14320] 14:25:04.144029 getpid() = 14320 [pid 14320] 14:25:04.144131 getpid() = 14320 [pid 14320] 14:25:04.144233 getpid() = 14320 [pid 14320] 14:25:04.144336 getpid() = 14320 [pid 14320] 14:25:04.144438 getpid() = 14320 [pid 14320] 14:25:04.144540 getpid() = 14320 [pid 14320] 14:25:04.144701 getpid() = 14320 [pid 14320] 14:25:04.144804 getpid() = 14320 [pid 14320] 14:25:04.144906 getpid() = 14320 [pid 14320] 14:25:04.145009 getpid() = 14320 [pid 14320] 14:25:04.145111 getpid() = 14320 [pid 14320] 14:25:04.145214 getpid() = 14320 [pid 14320] 14:25:04.145316 getpid() = 14320 [pid 14320] 14:25:04.145419 getpid() = 14320 [pid 14320] 14:25:04.145520 getpid() = 14320 [pid 14320] 14:25:04.145640 getpid() = 14320 [pid 14320] 14:25:04.145742 getpid() = 14320 [pid 14320] 14:25:04.145845 getpid() = 14320 [pid 14320] 14:25:04.145948 getpid() = 14320 [pid 14320] 14:25:04.146050 getpid() = 14320 [pid 14320] 14:25:04.146152 getpid() = 14320 [pid 14320] 14:25:04.146254 getpid() = 14320 [pid 14320] 14:25:04.146356 getpid() = 14320 [pid 14320] 14:25:04.146458 getpid() = 14320 [pid 14320] 14:25:04.146575 getpid() = 14320 [pid 14320] 14:25:04.146678 getpid() = 14320 [pid 14320] 14:25:04.146780 getpid() = 14320 [pid 14320] 14:25:04.146882 getpid() = 14320 [pid 14320] 14:25:04.146985 getpid() = 14320 [pid 14320] 14:25:04.147087 getpid() = 14320 [pid 14320] 14:25:04.147189 getpid() = 14320 [pid 14320] 14:25:04.147345 time(NULL) = 1086499504 [pid 14320] 14:25:04.147442 getpid() = 14320 [pid 14320] 14:25:04.147531 getpid() = 14320 [pid 14320] 14:25:04.147773 write(0, "\26\3\1\0J\2\0\0F\3\1@\302\252\260\204\203~\367\r\305G"..., 1127) = 1127 [pid 14320] 14:25:04.147937 read(0, "\26\3\1\1\6", 5) = 5 [pid 14320] 14:25:04.151416 read(0, "\20\0\1\2\1\0S\303\2\335E\264\330\250\261oj\307a~en\262"..., 262) = 262 [pid 14320] 14:25:04.151575 getpid() = 14320 [pid 14320] 14:25:04.151685 time([1086499504]) = 1086499504 [pid 14320] 14:25:04.151790 getpid() = 14320 [pid 14320] 14:25:04.151883 getpid() = 14320 [pid 14320] 14:25:04.155052 getpid() = 14320 [pid 14320] 14:25:04.155150 getpid() = 14320 [pid 14320] 14:25:04.178154 read(0, "\24\3\1\0\1", 5) = 5 [pid 14320] 14:25:04.178346 read(0, "\1", 1) = 1 [pid 14320] 14:25:04.178646 read(0, "\26\3\1\0000", 5) = 5 [pid 14320] 14:25:04.178810 read(0, "\10\215\371\334e+\324\356\224|\216\371\204\351\330f+\203"..., 48) = 48 [pid 14320] 14:25:04.179055 write(0, "\24\3\1\0\1\1\26\3\1\0000\26\2678\202\31\16\251\346\224"..., 59) = 59 [pid 14320] 14:25:04.179302 gettimeofday({1086499504, 179360}, NULL) = 0 ...
The ppid changed because I restarted /service while testing. I sent a short mail via SMTP/SSL to trigger the above trace.
> what's more, i wonder why this is going on? i'd almost be tempted to > attach to it with gdb and take a bt from getpid and see wtf is going > on Well, there was no gdb on that machine, compiling it now. AFAIR, tcpserver is stripped (it is a "production" machine), so I wonder how inforamative it will be.
I havent used gbd a lot, educate me what to do. For example how do I set a bp to trigger when getpid() is called ? I know how to set one in a function, but I guess function names are stripped.
Kalin.
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