[Samba] SegFault verifying external trust

[Stephen Brandli]

I think it's best that I don't put this into the bug system.  I'm too removed from the development process, and I don't have the time to build a debug version.  Not sure how helpful this will be.

Got the following segfault.

There are two domains: domain.brandlilaw.com and domain.brandli.com.  There is an external trust between them.  There were, at one time, 2-4 domain controllers for each domain running buster.  I upgraded domain.brandli.com a week ago and just upgraded domain.brandlilaw.com now, all 21.3.  brandli.com has two domain controllers: minister1 and minister2.  At the time of this segfault, brandlilaw.com had one domain controller, temple1.  The command below was run on temple1.

Not sure what else I can tell you.

                Steve

root at temple1:~# samba-tool domain trust validate brandli
LocalDomain Netbios[BRANDLILAW] DNS[domain.brandlilaw.com] SID[S-1-5-21-2136821272-1111453333-1140905514]
LocalTDO Netbios[BRANDLI] DNS[domain.brandli.com] SID[S-1-5-21-3237397562-3087105784-2935402547]
OK: LocalValidation: DC[\\minister1.domain.brandli.com] CONNECTION[WERR_OK] TRUST[WERR_OK] VERIFY_STATUS_RETURNED
OK: LocalRediscover: DC[\\minister1.domain.brandli.com] CONNECTION[WERR_OK]
===============================================================
INTERNAL ERROR: Signal 11: Segmentation fault in  () () pid 509 (4.21.3-Debian-4.21.3+dfsg-6~bpo12+1)
If you are running a recent Samba version, and if you think this problem is not yet fixed in the latest versions, please consider reporting this bug, see https://wiki.samba.org/index.php/Bug_Reporting
===============================================================
PANIC (pid 509): Signal 11: Segmentation fault in 4.21.3-Debian-4.21.3+dfsg-6~bpo12+1
BACKTRACE: 37 stack frames:
#0 /usr/lib/aarch64-linux-gnu/samba/libgenrand-private-samba.so.0(log_stack_trace+0x38) [0x7fff8ce51828]
#1 /usr/lib/aarch64-linux-gnu/samba/libgenrand-private-samba.so.0(smb_panic+0x14) [0x7fff8ce51ae4]
#2 /usr/lib/aarch64-linux-gnu/samba/libgenrand-private-samba.so.0(+0x1b7c) [0x7fff8ce51b7c]
#3 linux-vdso.so.1(__kernel_rt_sigreturn+0) [0x7fff8e2287a0]
#4 /usr/lib/aarch64-linux-gnu/samba/libcli-ldap-private-samba.so.0(+0x66f8) [0x7fff88e366f8]
#5 /usr/lib/aarch64-linux-gnu/samba/libcli-nbt-private-samba.so.0(+0x33b4) [0x7fff884633b4]
#6 /lib/aarch64-linux-gnu/libtevent.so.0(tevent_common_invoke_fd_handler+0x9c) [0x7fff8d0f791c]
#7 /lib/aarch64-linux-gnu/libtevent.so.0(+0xe614) [0x7fff8d0fe614]
#8 /lib/aarch64-linux-gnu/libtevent.so.0(+0xc3ec) [0x7fff8d0fc3ec]
#9 /lib/aarch64-linux-gnu/libtevent.so.0(_tevent_loop_once+0x94) [0x7fff8d0f6aa4]
#10 /lib/aarch64-linux-gnu/libtevent.so.0(tevent_req_poll+0x2c) [0x7fff8d0f8cac]
#11 /lib/aarch64-linux-gnu/libdcerpc.so.0(finddcs_cldap_recv+0x58) [0x7fff8993fa78]
#12 /lib/aarch64-linux-gnu/libdcerpc.so.0(finddcs_cldap+0x28) [0x7fff8993fb8c]
#13 /usr/lib/python3/dist-packages/samba/net.cpython-311-aarch64-linux-gnu.so(+0x2948) [0x7fff86252948]
#14 /usr/bin/python3() [0x4d4690]
#15 /usr/bin/python3(PyObject_Vectorcall+0x44) [0x4baf34]
#16 /usr/bin/python3(_PyEval_EvalFrameDefault+0x8f0) [0x4aa2c0]
#17 /usr/bin/python3() [0x512454]
#18 /usr/bin/python3() [0x511524]
#19 /usr/bin/python3(PyObject_Call+0xac) [0x4f3120]
#20 /usr/bin/python3(_PyEval_EvalFrameDefault+0x4980) [0x4ae350]
#21 /usr/bin/python3() [0x512454]
#22 /usr/bin/python3() [0x5114a8]
#23 /usr/bin/python3(_PyEval_EvalFrameDefault+0x4980) [0x4ae350]
#24 /usr/bin/python3(_PyFunction_Vectorcall+0x19c) [0x4e292c]
#25 /usr/bin/python3(_PyEval_EvalFrameDefault+0x4980) [0x4ae350]
#26 /usr/bin/python3(PyEval_EvalCode+0xb0) [0x4a0b90]
#27 /usr/bin/python3() [0x5f9b08]
#28 /usr/bin/python3() [0x5f6800]
#29 /usr/bin/python3() [0x607220]
#30 /usr/bin/python3(_PyRun_SimpleFileObject+0x188) [0x606dc8]
#31 /usr/bin/python3(_PyRun_AnyFileObject+0x50) [0x606b30]
#32 /usr/bin/python3(Py_RunMain+0x19c) [0x604dbc]
#33 /usr/bin/python3(Py_BytesMain+0x24) [0x5cec14]
#34 /lib/aarch64-linux-gnu/libc.so.6(+0x27740) [0x7fff8df27740]
#35 /lib/aarch64-linux-gnu/libc.so.6(__libc_start_main+0x98) [0x7fff8df27818]
#36 /usr/bin/python3(_start+0x30) [0x5ceab0]
Aborted