valgrind shared memory programs

[Philip M]

Unexpected error occurred attempting to attach to shared memory.

This worked fine in ubuntu 20 with our APP. But is failing on ubuntu 22. I tried the latest valgrind from the internet also, same thing.

root@pmilosla-ubuntu22:/opt/iris/TAGGED/mgr# valgrind ../bin/irisdb -s.
==236668== Memcheck, a memory error detector
==236668== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==236668== Using Valgrind-3.22.0 and LibVEX; rerun with -h for copyright info
==236668== Command: ../bin/irisdb -s.
==236668==
==236668== Conditional jump or move depends on uninitialised value(s)
==236668== at 0x936BB7: mainsub (mux.c:917)
==236668== by 0x939C56: mmain (mux.c:2341)
==236668== by 0x4107C9: main (main.c:120)
==236668==
==236668== Conditional jump or move depends on uninitialised value(s)
==236668== at 0x936BCA: mainsub (mux.c:918)
==236668== by 0x939C56: mmain (mux.c:2341)
==236668== by 0x4107C9: main (main.c:120)
==236668==
Unexpected error occurred attempting to attach to shared memory.
==236668==
==236668== HEAP SUMMARY:
==236668== in use at exit: 0 bytes in 0 blocks
==236668== total heap usage: 11 allocs, 11 frees, 80,626 bytes allocated
==236668==
==236668== All heap blocks were freed -- no leaks are possible
==236668==
==236668== Use --track-origins=yes to see where uninitialised values come from
==236668== For lists of detected and suppressed errors, rerun with: -s
==236668== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 0 from 0)
root@pmilosla-ubuntu22:/opt/iris/TAGGED/mgr#

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: valgrind (not installed)
ProcVersionSignature: Ubuntu 6.2.0-36.37~22.04.1-generic 6.2.16
Uname: Linux 6.2.0-36-generic x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov 17 12:05:06 2023
InstallationDate: Installed on 2023-06-14 (156 days ago)
InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223)
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: valgrind
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.default.apport:
 # set this to 0 to disable apport, or to 1 to enable it
 # you can temporarily override this with
 # sudo service apport start force_start=1
 enabled=0
mtime.conffile..etc.default.apport: 2023-07-11T12:19:20.955497

[Philip M (pmilosla)]

read(1028, "D", 1) = 1
close(4) = 0
getpid() = 237478
write(1027, "--237478-- REDIR: 0x522cc80 (lib"..., 91) = 91
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1ffeffdb28} ---
gettid() = 237478
mmap(0x1ffeffd000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x1ffeffd000
rt_sigreturn({mask=~[ILL TRAP BUS FPE KILL SEGV STOP SYS]}) = 7013
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1ffeffcb28} ---
gettid() = 237478
mmap(0x1ffeffc000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x1ffeffc000
rt_sigreturn({mask=~[ILL TRAP BUS FPE KILL SEGV STOP SYS]}) = 6501
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1ffeffbb28} ---
gettid() = 237478
mmap(0x1ffeffb000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x1ffeffb000
rt_sigreturn({mask=~[ILL TRAP BUS FPE KILL SEGV STOP SYS]}) = 5989
--- SIGSEGV {si_signo=SIGSEGV, si_code=SEGV_MAPERR, si_addr=0x1ffeffafe8} ---
gettid() = 237478
mmap(0x1ffeffa000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, 0, 0) = 0x1ffeffa000
rt_sigreturn({mask=~[ILL TRAP BUS FPE KILL SEGV STOP SYS]}) = 5629
getpid() = 237478
write(1027, "--237478-- REDIR: 0x5231eb0 (lib"..., 87) = 87
getpid() = 237478
getpid() = 237478
write(1027, "--237478-- REDIR: 0x5234180 (lib"..., 102) = 102
getpid() = 237478
write(1027, "--237478-- REDIR: 0x5230380 (lib"..., 86) = 86
getpid() = 237478
write(1027, "--237478-- REDIR: 0x5232240 (lib"..., 89) = 89
newfstatat(AT_FDCWD, ".", {st_mode=S_IFDIR|0775, st_size=4096, ...}, 0) = 0
getuid() = 0
getegid() = 0
setgid(1001) = 0
getpid() = 237478
write(1027, "==237478== Conditional jump or m"..., 70) = 70
getpid() = 237478
write(1027, "==237478== at 0x936BB7: mains"..., 47) = 47
getpid() = 237478
write(1027, "==237478== by 0x939C56: mmain"..., 46) = 46
getpid() = 237478
write(1027, "==237478== by 0x4107C9: main "..., 45) = 45
getpid() = 237478
write(1027, "==237478== Uninitialised value "..., 66) = 66
getpid() = 237478
write(1027, "==237478== at 0x935B36: mains"..., 47) = 47
getpid() = 237478
write(1027, "==237478== \n", 12) = 12
getpid() = 237478
write(1027, "==237478== Conditional jump or m"..., 70) = 70
getpid() = 237478
write(1027, "==237478== at 0x936BCA: mains"..., 47) = 47
getpid() = 237478
write(1027, "==237478== by 0x939C56: mmain"..., 46) = 46
getpid() ...

[Philip M (pmilosla)]

I also built valgrind 3.15 using the ubu 20.04 source package and that gets the same error in ubu 22.04

[Philip M (pmilosla)]

If anyone want a clue, the irisdb thing uses a ton of shared memory, at least 512MB always.

[Philip M (pmilosla)]

Just tried RH9 on the same laptop, and valgrind works there for the same shared memory app.

[Pjfloyd (pjfloyd)]

 ==236668== Conditional jump or move depends on uninitialised value(s)

Fix your bugs first.

[Philip M (pmilosla)]

This is a very old and very heavily in use application. Think interpreted language. There are many developers. There is something ubuntu 22 specific that doesn't happen on RH 9 going on with shared memory. I did fix (they were not the cause of any issue) those 2 places temporarily and I am still getting this.

Attached is a clean run without valgrind errors that still gets the shared memory attachment message when run through valgrind.

pmilosla@pmilosla-ubuntu22:mgr> grep memory valgrind_log_226662.txt
==226662== Memcheck, a memory error detector
pmilosla@pmilosla-ubuntu22:mgr> sudo valgrind --verbose --tool=memcheck --log-file=valgrind_log_%p.txt --trace-children=yes --leak-check=full --show-leak-kinds=all --track-origins=yes ../bin/irisdb -s.
Unexpected error occurred attempting to attach to shared memory.
pmilosla@pmilosla-ubuntu22:mgr> sudo ../bin/irisdb -s.

Node: pmilosla-ubuntu22, Instance: LATEST

USER>h
pmilosla@pmilosla-ubuntu22:mgr>

[Philip M (pmilosla)]

Up to shmat call, the args are exactly the same in both cases:
pmilosla@pmilosla-ubuntu22:mgr> sudo ../bin/irisdb -s. About to call attshm with irisdb arg:0 msgbuf:
shmem crckeystr crc:1786300436
status: 1 buf:

Node: pmilosla-ubuntu22, Instance: LATEST

USER>h
pmilosla@pmilosla-ubuntu22:mgr> sudo valgrind --verbose --tool=memcheck --log-file=valgrind_log_%p.txt --trace-children=yes --leak-check=full --show-leak-kinds=all --track-origins=yes ../bin/irisdb -s.
About to call attshm with irisdb arg:0 msgbuf:
shmem crckeystr crc:1786300436
status: -1 buf:Error 22 mapping shared memory id 0x002f8023 (keyval: 0x6a78c814)
Unexpected error occurred attempting to attach to shared memory.
pmilosla@pmilosla-ubuntu22:mgr>

pmilosla@pmilosla-ubuntu22:mgr> ipcs

------ Message Queues --------
key msqid owner perms used-bytes messages
0x00000000 98304 root 660 0 0
0x00000000 98305 root 660 0 0
0x00000000 98306 root 660 0 0

------ Shared Memory Segments --------
key shmid owner perms bytes nattch status
0x00000000 1572877 pmilosla 606 15377076 2 dest
0x00000000 1572878 pmilosla 606 15377076 2 dest
0x00000000 3112976 pmilosla 600 524288 2 dest
0x00000000 1572882 pmilosla 600 524288 2 dest
0x00000000 2850845 pmilosla 600 524288 2 dest
0x00000000 3112993 pmilosla 600 524288 2 dest
0x6a78c814 3112995 root 660 1090519040 25
0x00000000 3145764 pmilosla 600 524288 2 dest
0x00000000 3113008 pmilosla 600 524288 2 dest

------ Semaphore Arrays --------
key semid owner perms nsems

[Philip M (pmilosla)]

If I pass a second argument to shmat of 0x8000000, the application starts up under ubuntu 22. I didnt have to do this for ubuntu 20 or RH9.