Mail Archives: cygwin/2005/12/21/12:17:33
On Wed, 21 Dec 2005, Christopher Faylor wrote:
> Only four more testing days remain if we want to get a cygwin 1.5.19
> release out there by Christmas. Please try a snapshot and report
> success/failure to this thread.
>
> When reporting a problem please report the exact steps that you've taken
> and *please* narrow down the failure to the absolute minimum scenario
> needed to duplicate it.
>
> So, please try the 2005-Dec-21 snapshot: http://cygwin.com/snapshots/ .
I've been having problems with "fork: resource unavailable" on my machine
with the 10/03 snapshot. The problem is only reproducible after Cygwin
has been running for a while, under a heavy load. I'll try to see if it
appears under the 12/20 snapshot, but there's no guarantee I'll be able to
reproduce it in time for the release. I know this isn't much of a bug
report, but this is just a heads-up.
I'm at a loss on how to proceed. Would an strace captured under the 10/03
snapshot be helpful at all? If not, would it at least be possible to add
the relevant debugging information to the fork() code, so that when I do
reproduce this (and I have a feeling that in a few days, I'll be able to),
I can get meaningful information from the strace even with the outdated
snapshot? Unfortunately, the whole nature of the problem setting
precludes using the latest snapshot... I also have a feeling that this
would be next to impossible to reproduce on other machines...
FWIW, here's the (IMO) relevant bit of the strace, captured under the
10/03 snapshot. I don't know how normal it is for a newly-created process
to have the PID_EXITED bit set:
22 76572 [main] bash 12000 fork: entering
20 76592 [main] bash 12000 sig_send: sendsig 0x734, pid 12000, signal -40, its_me 1
22 76614 [main] bash 12000 sig_send: wakeup 0x6E4
27 76641 [main] bash 12000 sig_send: Waiting for pack.wakeup 0x6E4
26 76667 [main] bash 12000 sig_send: returning 0x0 from sending signal -40
255 76922 [main] bash 12000 stack_base: bottom 0x230000, top 0x22E72C, stack 0x22E72C, size 6356, reserve 6356
21 76943 [main] bash 12000 frok::parent: CreateProcess (C:\cygwin\bin\bash.exe, C:\cygwin\bin\bash.exe, 0, 0, 1, 0x20, 0, 0, 0x22E730, 0x22E7A0)
1180 78123 [sig] bash 12000 wait_sig: signalled 0x6E4
(the part below is repeated 20 times)
37 89289 [main] bash 12000 open_shared: name (null), n 11608, shared 0x1470000 (wanted 0x0), h 0x6D4
22 89311 [main] bash 12000 pinfo::init: looping because pid 11608, procinfo->pid 11608, procinfo->dwProcessid 6644 has PID_EXITED set
(the part above is repeated 20 times)
38 89349 [main] bash 12000 frok::parent: pinfo failed
28 89377 [main] bash 12000 frok::parent: returning -1
18 89395 [main] bash 12000 fork: fork failed - child pid 11608, errno 11
19 89414 [main] bash 12000 __set_errno: int fork():602 val 11
19 89433 [main] bash 12000 fork: -1 = fork()
Any pointers/advice would be appreciated.
Igor
--
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|,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D.
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