lib/57628: multithread programs may deadlock in ld.elf_so (sparc on sparc64)

To: lib-bug-people%netbsd.org@localhost,gnats-admin%netbsd.org@localhost,netbsd-bugs%netbsd.org@localhost
Subject: lib/57628: multithread programs may deadlock in ld.elf_so (sparc on sparc64)
From: martin%NetBSD.org@localhost
Date: Mon, 25 Sep 2023 09:40:01 +0000 (UTC)

>Number:         57628
>Category:       lib
>Synopsis:       multithread programs may deadlock in ld.elf_so (sparc on sparc64)
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    lib-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 25 09:40:01 +0000 2023
>Originator:     Martin Husemann
>Release:        NetBSD 10.99.9
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD nelly.aprisoft.de 10.99.9 NetBSD 10.99.9 (NELLY) #75: Sun Sep 24 09:30:35 CEST 2023 martin%seven-days-to-the-wolves.aprisoft.de@localhost:/work/src/sys/arch/sparc64/compile/NELLY sparc
Architecture: sparc
Machine: sparc
>Description:

Running sparc userland ATF tests on sparc64 shows a few tests deadlocking
like this:

[~] root@nelly # gdb -p 15928
GNU gdb (GDB) 13.2
Copyright (C) 2023 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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There is NO WARRANTY, to the extent permitted by law.
Type "show copying" and "show warranty" for details.
This GDB was configured as "sparc--netbsdelf".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<https://www.gnu.org/software/gdb/bugs/>.
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Attaching to process 15928
Reading symbols from /usr/bin/rump_server...
Reading symbols from /usr/libdata/debug//usr/bin/rump_server.debug...
[New LWP 15537 of process 15928]
[New LWP 19607 of process 15928]
[New LWP 21178 of process 15928]
[New LWP 18138 of process 15928]
[New LWP 18206 of process 15928]
[New LWP 17453 of process 15928]
[New LWP 17889 of process 15928]
[New LWP 9653 of process 15928]
[New LWP 17218 of process 15928]
[New LWP 18547 of process 15928]
[New LWP 14775 of process 15928]
[New LWP 3924 of process 15928]
[New LWP 3116 of process 15928]
[New LWP 19701 of process 15928]
[New LWP 15928 of process 15928]
Reading symbols from /usr/lib/librumpkern_sysproxy.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/librumpkern_sysproxy.so.0.0.debug...
Reading symbols from /usr/lib/librump.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/librump.so.0.0.debug...
Reading symbols from /usr/lib/librumpvfs_nofifofs.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/librumpvfs_nofifofs.so.0.0.debug...
Reading symbols from /usr/lib/librumpvfs.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/librumpvfs.so.0.0.debug...
Reading symbols from /usr/lib/librumpuser.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/librumpuser.so.0.1.debug...
Reading symbols from /usr/lib/libpthread.so.1...
Reading symbols from /usr/libdata/debug//usr/lib/libpthread.so.1.4.debug...
Reading symbols from /usr/lib/libsparc_v8.so.0...
Reading symbols from /usr/libdata/debug//usr/lib/libsparc_v8.so.0.0.debug...
(No debugging symbols found in /usr/libdata/debug//usr/lib/libsparc_v8.so.0.0.debug)
Reading symbols from /usr/lib/libc.so.12...
Reading symbols from /usr/libdata/debug//usr/lib/libc.so.12.221.debug...
Reading symbols from /usr/lib/libgcc_s.so.1...
Reading symbols from /usr/libdata/debug//usr/lib/libgcc_s.so.1.0.debug...
Reading symbols from /usr/lib/librumpkern_simplehook_tester.so...
Reading symbols from /usr/libdata/debug//usr/lib/librumpkern_simplehook_tester.so.0.0.debug...
Reading symbols from /usr/libexec/ld.elf_so...
Reading symbols from /usr/libdata/debug//usr/libexec/ld.elf_so.debug...
[Switching to LWP 19391 of process 15928]
_rtld_shared_enter () at /work/src/libexec/ld.elf_so/rtld.c:1716
1716    /work/src/libexec/ld.elf_so/rtld.c: No such file or directory.
(gdb) bt
#0  _rtld_shared_enter () at /work/src/libexec/ld.elf_so/rtld.c:1716
#1  0x2ad113b4 in _rtld_bind (obj=0x3eda4800, reloff=6504)
    at /work/src/libexec/ld.elf_so/arch/sparc/mdreloc.c:420
#2  0x2ad10f10 in _rtld_bind_start () from /usr/libexec/ld.elf_so
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) info thread
  Id   Target Id                              Frame 
* 1    LWP 19391 of process 15928 "entbutler" _rtld_shared_enter ()
    at /work/src/libexec/ld.elf_so/rtld.c:1716
  2    LWP 15537 of process 15928 "xcall/1"   pthread_cond_timedwait (
    cond=0x3edcaba0, mutex=0x3edc7c80, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  3    LWP 19607 of process 15928 "sipbnc"    pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  4    LWP 21178 of process 15928 "rumpclk1"  pthread_cond_timedwait (
    cond=0x3edca960, mutex=0x3edc7980, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  5    LWP 18138 of process 15928 "xcall/0"   pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  6    LWP 18206 of process 15928 "rsi1/0"    pthread_cond_timedwait (
    cond=0x3edcab00, mutex=0x3edc7980, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  7    LWP 17453 of process 15928 "rsi0/0"    pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  8    LWP 17889 of process 15928 "rsi1/3"    pthread_cond_timedwait (
    cond=0x3edcab60, mutex=0x3edc7980, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  9    LWP 9653 of process 15928 "rsi0/3"     pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  10   LWP 17218 of process 15928 "rsi1/2"    pthread_cond_timedwait (
    cond=0x3edcab40, mutex=0x3edc7980, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  11   LWP 18547 of process 15928 "rsi0/2"    pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  12   LWP 14775 of process 15928 "sipbnc"    pthread_cond_timedwait (
    cond=0x3edcab80, mutex=0x3edc7f80, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  13   LWP 3924 of process 15928 "rumpclk0"   pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  14   LWP 3116 of process 15928 "rsi1/1"     pthread_cond_timedwait (
    cond=0x3edcab20, mutex=0x3edc7980, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  15   LWP 19701 of process 15928 "rsi0/1"    pthread_cond_timedwait (
    cond=0x3edca940, mutex=0x3edc7900, abstime=0x0)
    at /work/src/lib/libpthread/pthread_cond.c:172
  16   LWP 15928 of process 15928 ""          _rtld_shared_enter ()
    at /work/src/libexec/ld.elf_so/rtld.c:1716
(gdb) thread 16
[Switching to thread 16 (LWP 15928 of process 15928)]
#0  _rtld_shared_enter () at /work/src/libexec/ld.elf_so/rtld.c:1716
1716    in /work/src/libexec/ld.elf_so/rtld.c
(gdb) bt
#0  _rtld_shared_enter () at /work/src/libexec/ld.elf_so/rtld.c:1716
#1  0x2ad113b4 in _rtld_bind (obj=0x3eda4800, reloff=7044)
    at /work/src/libexec/ld.elf_so/arch/sparc/mdreloc.c:420
#2  0x2ad10f10 in _rtld_bind_start () from /usr/libexec/ld.elf_so


>How-To-Repeat:

just try to run ATF tests with 32bit userland on a sparc64 kernel

>Fix:
n/a

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