Bug 209877

Summary:

PTHREAD_STACK_MIN is smaller than page size.

Product:

[Fedora] Fedora

Reporter:

David Woodhouse <dwmw2>

Component:

glibc

Assignee:

Jakub Jelinek <jakub>

Status:

CLOSED RAWHIDE

QA Contact:

Brian Brock <bbrock>

Severity:

medium

Docs Contact:

Priority:

medium

Version:

rawhide

Target Milestone:

---

Target Release:

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Hardware:

ppc64

OS:

Linux

Whiteboard:

Fixed In Version:

2.5-3

Doc Type:

Bug Fix

Doc Text:

Story Points:

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Clone Of:

Environment:

Last Closed:

2006-10-09 18:53:41 UTC

Type:

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Regression:

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Mount Type:

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Documentation:

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CRM:

Verified Versions:

Category:

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oVirt Team:

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RHEL 7.3 requirements from Atomic Host:

Cloudforms Team:

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Target Upstream Version:

Embargoed:

Bug Depends On:

Bug Blocks:

150224, 206172

Attachments:

Description	Flags
Test code.	none

Description David Woodhouse 2006-10-07 10:34:23 UTC

See attached test program.

See correct behaviour when run on ppc32 kernel.
See timer_create() returning -EAGAIN when run on ppc64 kernel.

pmac /home/dwmw2 $ ./sigev_thread 
Creating timer
Create timer: Resource temporarily unavailable
pmac /home/dwmw2 $ ssh shinybook ./sigev_thread
Creating timer

Comment 1 David Woodhouse 2006-10-07 10:35:14 UTC

Created attachment 137969 [details]
Test code.

Comment 2 David Woodhouse 2006-10-07 10:38:12 UTC

This is what happens on ppc32 kernel (ignore the last few lines; that's just
strace being buggered and needing to be killed; bug 209873):


write(1, "Creating timer\n", 15Creating timer
)        = 15
rt_sigprocmask(SIG_SETMASK, ~[RT_1], [], 8) = 0
mmap(NULL, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0x30002000
brk(0)                                  = 0x10011000
brk(0x10032000)                         = 0x10032000
mprotect(0x30002000, 4096, PROT_NONE)   = 0
clone(Process 18046 attached
child_stack=0x30005040,
flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID,
parent_tidptr=0x30005508, tls=0x3000c940, child_tidptr=0x30005508) = 18046
[pid 18045] rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
[pid 18045] futex(0xf03017c, FUTEX_WAKE, 2147483647) = 0
[pid 18045] timer_create(CLOCK_REALTIME, {0x10011098, 32, SIGEV_THREAD_ID,
{18046}}, {0x1}) = 0
[pid 18045] exit_group(1)               = ?
[pid 18046] --- SIGSTOP (Stopped (signal)) @ 0 (0) ---
[pid 18046] SYS_300(0x30005510, 0xc, 0x30005508, 0x3000c940, 0x30005508) = 0
[pid 18046] rt_sigtimedwait([RTMIN], Killed

Comment 3 David Woodhouse 2006-10-07 10:38:49 UTC

And this is what happens on ppc64...

write(1, "Creating timer\n", 15Creating timer
)        = 15
rt_sigprocmask(SIG_SETMASK, ~[RT_1], [], 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
futex(0xefb017c, FUTEX_WAKE, 2147483647) = 0
dup(2)                                  = 3
fcntl64(3, F_GETFL)                     = 0x2 (flags O_RDWR)
brk(0)                                  = 0x10020000
brk(0x10050000)                         = 0x10050000
fstat64(3, {st_mode=S_IFCHR|0620, st_rdev=makedev(136, 20), ...}) = 0
mmap(NULL, 65536, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
0xf7fd0000
_llseek(3, 0, 0xff1aee38, SEEK_CUR)     = -1 ESPIPE (Illegal seek)
write(3, "Create timer: Resource temporari"..., 47Create timer: Resource
temporarily unavailable
) = 47
close(3)                                = 0
munmap(0xf7fd0000, 65536)               = 0
exit_group(1)                           = ?
Process 7277 detached

Comment 6 David Woodhouse 2006-10-07 11:38:45 UTC

We fail to create the helper thread. This is because we try to create it with a
stack size of PTHREAD_STACK_MIN, which seems to be 16384.

That's not going to work on a machine with 64KiB pages.

Comment 7 Jakub Jelinek 2006-10-08 18:28:28 UTC

Please try glibc-2.5-3.
It isn't 100% POSIX conforming on ppc{,64}, because it doesn't reject
pthread_attr_setstack{,size} with sizes between 16K and 128K (new
PTHREAD_STACK_MIN), but that is only solvable with symbol versioning and
therefore only in glibc 2.6 which we can't ship in FC6.

Comment 8 David Woodhouse 2006-10-09 10:46:49 UTC

glibc-2.5-3 fixes the test case.