[Samba] smbd hung processes - Samba 3.0.7

[john.debella at teradyne.com]

This time things behaved a little differently. Samba was not replying to 
mount requests. An strace of the parent smbd process showed that the 
requests coming in were attempted to be spawned, however, were failing. I 
observed this behavior when we had processes hanging and the spawned 
processes appeared to be hung on a lock. We've since removed strick 
locking and now the spawned processes die immediately after being spawned.


clone(child_stack=0, 
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0xb72142e8) = 29287
close(22)                               = 0
select(1024, [18 19 20], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(-1, NULL, WNOHANG)              = 29284
waitpid(-1, NULL, WNOHANG)              = 0
sigreturn()                             = ? (mask now [FPE USR2 PIPE])
select(1024, [18 19 20], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(-1, NULL, WNOHANG)              = 29285
waitpid(-1, NULL, WNOHANG)              = 0
sigreturn()                             = ? (mask now [FPE USR2 PIPE])
select(1024, [18 19 20], NULL, NULL, NULL) = 1 (in [18])
time(NULL)                              = 1102529684
accept(18, {sa_family=AF_INET, sin_port=htons(1865), 
sin_addr=inet_addr("131.101.53.201")}, [16]) = 22
fcntl64(22, F_GETFL)                    = 0x2 (flags O_RDWR)
fcntl64(22, F_SETFL, O_RDWR)            = 0
clone(child_stack=0, 
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0xb72142e8) = 29288
close(22)                               = 0
select(1024, [18 19 20], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(-1, NULL, WNOHANG)              = 29286
waitpid(-1, NULL, WNOHANG)              = 0
sigreturn()                             = ? (mask now [FPE USR2 PIPE])
select(1024, [18 19 20], NULL, NULL, NULL) = 1 (in [18])
time(NULL)                              = 1102529684
accept(18, {sa_family=AF_INET, sin_port=htons(1304), 
sin_addr=inet_addr("131.101.18.20")}, [16]) = 22
fcntl64(22, F_GETFL)                    = 0x2 (flags O_RDWR)
fcntl64(22, F_SETFL, O_RDWR)            = 0
clone(child_stack=0, 
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0xb72142e8) = 29289
close(22)                               = 0
select(1024, [18 19 20], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---
waitpid(-1, NULL, WNOHANG)              = 29287
waitpid(-1, NULL, WNOHANG)              = 0
sigreturn()                             = ? (mask now [FPE USR2 PIPE])
select(1024, [18 19 20], NULL, NULL, NULL) = 1 (in [18])
time(NULL)                              = 1102529684
accept(18, {sa_family=AF_INET, sin_port=htons(2064), 
sin_addr=inet_addr("131.101.185.75")}, [16]) = 22
fcntl64(22, F_GETFL)                    = 0x2 (flags O_RDWR)
fcntl64(22, F_SETFL, O_RDWR)            = 0
clone(child_stack=0, 
flags=CLONE_CHILD_CLEARTID|CLONE_CHILD_SETTID|SIGCHLD, 
child_tidptr=0xb72142e8) = 29290
close(22)                               = 0
select(1024, [18 19 20], NULL, NULL, NULL) = ? ERESTARTNOHAND (To be 
restarted)
--- SIGCHLD (Child exited) @ 0 (0) ---







"Gerald (Jerry) Carter" <jerry at samba.org>
12/08/2004 11:53 AM

 
        To:     john.debella at teradyne.com
        cc:     samba at samba.org
        Subject:        Re: [Samba] smbd hung processes - Samba 3.0.7


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john.debella at teradyne.com wrote:

| Hmmm. So do you think turning off strict locking will
| help or is there something "wrong" with the tdb records
| that we can clear?

First we need to find out what file that fd is associated
with.  Then we can start working backwards to find root cause.








cheers, jerry
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