samba - Apr 2019 - gencache.tdb: device busy

I added LOG statements to mutex.c printing the strerror from the return values.
 
From
 
ret = pthread_mutexattr_init(&ma); in line 570
 
I got errorno 16 --> device busy.
 
But due the manual of pthread_mutex_attr_init() there should only be ENOMEM and
EINVAL...
 
Doing gdb smbd -> run
Doe not reveal anything, but I never used gdb for debugging anything. I just
gave it a shot...
 
 
 
 

Gesendet: Montag, 01. April 2019 um 20:50 Uhr
Von: "Jeremy Allison" <jra at samba.org>
An: "Rouven WEILER" <Rouven_Weiler at gmx.net>
Betreff: Re: [Samba] gencache.tdb: device busy
On Mon, Apr 01, 2019 at 08:44:45PM +0200, Rouven WEILER
wrote:
> I got a truss output which is the equivalent to strace on solaris as far as
i got that.
> As I am not experience with strace or truss: How to I get the correct info
out of it…
> I got info from this command, but do not see the pthread_XXX calls.
>
> Are there special command args I could use?
>
> Doing a "truss -f smbd > truss.out 2>&1“ came up with the
output (complete output attached):
> 2116: setgroups(11, 0x011FCC40) = 0
> 2116: setregid(4294967295, 0) = 0
> 2116: getgid() = 0 [0]
> 2116: setreuid(4294967295, 0) = 0
> 2116: getuid() = 0 [0]
> 2116: umask(0) = 0
> 2116: mkdir("/var/samba/lock", 0755) Err#17 EEXIST
> 2116: umask(0) = 0
> 2116: lstat("/var/samba/lock", 0xFFFFFD7FFFDFB240) = 0
> 2116: open("/var/samba/lock/gencache.tdb", O_RDWR|O_CREAT, 0644)
= 21
> 2116: fcntl(21, F_GETFD, 0x00000000) = 0
> 2116: fcntl(21, F_SETFD, 0x00000001) = 0
> 2116: fcntl(21, F_SETLKW, 0xFFFFFD7FFFDFB040) = 0
> 2116: read(21, " T D B f i l e\n\0\0\0".., 168) = 168
> 2116: fstat(21, 0xFFFFFD7FFFDFB130) = 0
> 2116: fcntl(21, F_SETLK, 0xFFFFFD7FFFDFB040) = 0
> 2116: mmap(0x00000000, 241664, PROT_READ|PROT_WRITE, MAP_SHARED, 21, 0) =
0xFFFFFD7FED194000
> 2116: lwp_mutex_register(0xFFFFFD7FED1940C8, 0xFFFFFD7FED2A30D0) = 0
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This is probably what the pthread_XXX calls map to on Solaris.

You'll need to dig closer (maybe add debug statements)
to tdb_mutex_init() to see exactly which call fails.

On Tue, Apr 02, 2019 at 01:24:19PM +0200, Rouven WEILER
wrote:
> 
> 
> I added LOG statements to mutex.c printing the strerror from the return
values.
>  
> From
>  
> ret = pthread_mutexattr_init(&ma); in line 570
>  
> I got errorno 16 --> device busy.
>  
> But due the manual of pthread_mutex_attr_init() there should only be ENOMEM
and EINVAL...
>  
> Doing gdb smbd -> run
> Doe not reveal anything, but I never used gdb for debugging anything. I
just gave it a shot...
Sorry, looks a little like the libc/pthread_mutex support
on Solaris is broken. You might want to raise this on a
Solaris/Illumos forum.

On the same system samba 4.9.5 works like a charm.
I would agree that pthreads are broken, but then 4.9.5 wouldn’t work either.
Or is there a difference?

Is there a configure option that tweaks pthread support (on, off, options for
pthreads…)?

> Am 02.04.2019 um 18:59 schrieb Jeremy Allison via samba <samba at
lists.samba.org>:
> 
> On Tue, Apr 02, 2019 at 01:24:19PM +0200, Rouven WEILER wrote:
>> 
>> 
>> I added LOG statements to mutex.c printing the strerror from the return
values.
>>  
>> From
>>  
>> ret = pthread_mutexattr_init(&ma); in line 570
>>  
>> I got errorno 16 --> device busy.
>>  
>> But due the manual of pthread_mutex_attr_init() there should only be
ENOMEM and EINVAL...
>>  
>> Doing gdb smbd -> run
>> Doe not reveal anything, but I never used gdb for debugging anything. I
just gave it a shot...
> 
> Sorry, looks a little like the libc/pthread_mutex support
> on Solaris is broken. You might want to raise this on a
> Solaris/Illumos forum.
> 
> -- 
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