[Samba] Samba 4.4.5 exists with segmention fault on FreeBSD 10.3 during domain provision

Discussion:

Michael Osipov

2016-07-19 18:17:19 UTC

Hi folks,

I am trying to set up a domain/forest in VirtualBox server.
My setup:
* # uname -a
FreeBSD bsd1dc.ad001.osipov.eu 10.3-RELEASE-p4 FreeBSD
10.3-RELEASE-p4 64 bit
* Samba 4.4.5 from Ports tree
# samba-tool -V
4.4.5
* Python 2 from Ports tree
# python2 --version
Python 2.7.12

Installation went smoothly but during domain provisioning Python fails
with a segmentation fault and leaves a core dump file.

The very last output of samba-tool:
store_acl_blob_fsp: storing blob length 356 on file
/var/db/samba4/sysvol/ad001.osipov.eu/Policies
delete_windows_lock_ref_count for file
/var/db/samba4/sysvol/ad001.osipov.eu/Policies
Speicherschutzverletzung(core dumped)

Running the same operation again with truss:
write(2,"store_acl_blob_fsp: storing blob"...,99) = 99 (0x63)
extattr_set_fd(0xf,0x1,0x827447cbf,0x825859760,0x164) = 356 (0x164)
write(2,"delete_windows_lock_ref_count fo"...,86) = 86 (0x56)
close(15) = 0 (0x0)
umask(0x12) = 0 (0x0)
fcntl(10,F_SETLKW,0x7fffffffcba8) = 0 (0x0)
fcntl(10,F_SETLKW,0x7fffffffcc48) = 0 (0x0)
fcntl(12,F_SETLK,0x7fffffffbdf8) = 0 (0x0)
fcntl(12,F_SETLKW,0x7fffffffbe78) = 0 (0x0)
fcntl(12,F_SETLKW,0x7fffffffbee8) = 0 (0x0)
fcntl(11,F_SETLK,0x7fffffffcd28) = 0 (0x0)
fcntl(11,F_SETLKW,0x7fffffffcda8) = 0 (0x0)
fcntl(11,F_SETLKW,0x7fffffffce18) = 0 (0x0)
SIGNAL 11 (SIGSEGV)
process killed, signal = 11 (core dumped)

Loading the core dump in GDB (command 'where') gives me:
#0 0x0000000806e5ba6e in ndr_pull_uint8 (ndr=0x833ce82e0, ndr_flags=256,
v=0x7fffffffcc5f "") at ../librpc/ndr/ndr_basic.c:82
#1 0x0000000806e5f133 in ndr_pull_enum_uint8 (ndr=0x833ce82e0,
ndr_flags=256,
v=0x7fffffffcc5f "") at ../librpc/ndr/ndr_basic.c:346
#2 0x000000080708bf95 in ndr_pull_security_descriptor_revision (
ndr=0x833ce82e0, ndr_flags=256, r=0x832200480)
at default/librpc/gen_ndr/ndr_security.c:657
#3 0x000000080708ccb7 in ndr_pull_security_descriptor (ndr=0x833ce82e0,
ndr_flags=768, r=0x832200480) at
default/librpc/gen_ndr/ndr_security.c:768
#4 0x0000000806e692f6 in ndr_pull_struct_blob_all (blob=0x7fffffffce08,
mem_ctx=0x8021fb100, p=0x832200480,
fn=0x80708cbb0 <ndr_pull_security_descriptor>) at
../librpc/ndr/ndr.c:1133
#5 0x0000000811761084 in py_security_descriptor_ndr_unpack (
py_obj=0x82607bf50, args=0x817a7aa10, kwargs=0x82607d398)
at default/librpc/gen_ndr/py_security.c:1518
..

Both, truss output and core dump can be provided.

What can I do about this crash? Downgrade Python?

Help is pretty much appreciated.

Michael

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David STIEVENARD

2016-07-21 07:52:16 UTC

Permalink

Hi Michael,

I'm facing the same problem, samba 4.4.x is apparently broken on FreeBSD
for now.
Here's a link to the bug
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209787

For now the port maintainer seem out of ideas to fix this. You seems
more skilled then me on freebsd, maybe you can help him on this bug :)

DS

Post by Michael Osipov
Hi folks,
I am trying to set up a domain/forest in VirtualBox server.
* # uname -a
FreeBSD bsd1dc.ad001.osipov.eu 10.3-RELEASE-p4 FreeBSD
10.3-RELEASE-p4 64 bit
* Samba 4.4.5 from Ports tree
# samba-tool -V
4.4.5
* Python 2 from Ports tree
# python2 --version
Python 2.7.12
Installation went smoothly but during domain provisioning Python fails
with a segmentation fault and leaves a core dump file.
store_acl_blob_fsp: storing blob length 356 on file
/var/db/samba4/sysvol/ad001.osipov.eu/Policies
delete_windows_lock_ref_count for file
/var/db/samba4/sysvol/ad001.osipov.eu/Policies
Speicherschutzverletzung(core dumped)
write(2,"store_acl_blob_fsp: storing blob"...,99) = 99 (0x63)
extattr_set_fd(0xf,0x1,0x827447cbf,0x825859760,0x164) = 356 (0x164)
write(2,"delete_windows_lock_ref_count fo"...,86) = 86 (0x56)
close(15) = 0 (0x0)
umask(0x12) = 0 (0x0)
fcntl(10,F_SETLKW,0x7fffffffcba8) = 0 (0x0)
fcntl(10,F_SETLKW,0x7fffffffcc48) = 0 (0x0)
fcntl(12,F_SETLK,0x7fffffffbdf8) = 0 (0x0)
fcntl(12,F_SETLKW,0x7fffffffbe78) = 0 (0x0)
fcntl(12,F_SETLKW,0x7fffffffbee8) = 0 (0x0)
fcntl(11,F_SETLK,0x7fffffffcd28) = 0 (0x0)
fcntl(11,F_SETLKW,0x7fffffffcda8) = 0 (0x0)
fcntl(11,F_SETLKW,0x7fffffffce18) = 0 (0x0)
SIGNAL 11 (SIGSEGV)
process killed, signal = 11 (core dumped)
#0 0x0000000806e5ba6e in ndr_pull_uint8 (ndr=0x833ce82e0, ndr_flags=256,
v=0x7fffffffcc5f "") at ../librpc/ndr/ndr_basic.c:82
#1 0x0000000806e5f133 in ndr_pull_enum_uint8 (ndr=0x833ce82e0,
ndr_flags=256,
v=0x7fffffffcc5f "") at ../librpc/ndr/ndr_basic.c:346
#2 0x000000080708bf95 in ndr_pull_security_descriptor_revision (
ndr=0x833ce82e0, ndr_flags=256, r=0x832200480)
at default/librpc/gen_ndr/ndr_security.c:657
#3 0x000000080708ccb7 in ndr_pull_security_descriptor (ndr=0x833ce82e0,
ndr_flags=768, r=0x832200480) at
default/librpc/gen_ndr/ndr_security.c:768
#4 0x0000000806e692f6 in ndr_pull_struct_blob_all (blob=0x7fffffffce08,
mem_ctx=0x8021fb100, p=0x832200480,
fn=0x80708cbb0 <ndr_pull_security_descriptor>) at
../librpc/ndr/ndr.c:1133
#5 0x0000000811761084 in py_security_descriptor_ndr_unpack (
py_obj=0x82607bf50, args=0x817a7aa10, kwargs=0x82607d398)
at default/librpc/gen_ndr/py_security.c:1518
..
Both, truss output and core dump can be provided.
What can I do about this crash? Downgrade Python?
Help is pretty much appreciated.
Michael

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Michael Osipov

2016-07-21 13:26:00 UTC

Permalink

Post by David STIEVENARD
Hi Michael,
I'm facing the same problem, samba 4.4.x is apparently broken on FreeBSD
for now.
Here's a link to the bug
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209787
For now the port maintainer seem out of ideas to fix this. You seems
more skilled then me on freebsd, maybe you can help him on this bug :)

Hi David,

first of all thank you for the confirmation. Luckily, I am not the only
one with the issue.
Meanwhile, I have downgraded to 4.3.11 and was able to provision the
domain and join another FreeBSD member as well as a Windows 7 machine.

I will have a look at the ticket and see how I can help to resolve it.

Michael

Post by David STIEVENARD

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