Alpine 3.13: Segmentation fault on installing cifs-utils

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Is this reproducible? Could you run this under strace to get some additional logs, or under gdb or valgrind to get a backtrace?

Yes, I have reproduced it multiple times on two separate hosts (Windows 10 and Ubuntu 20.04)

Annoyingly, it does not segfault when I install strace first. Installing gdb first also segfaults (but installing strace first, then gdb, works) Installing valgrind first, then installing --cifs-utils does not segfault, but it reports some errors:

> valgrind apk add --update cifs-utils

==12== Memcheck, a memory error detector
==12== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al.
==12== Using Valgrind-3.16.1 and LibVEX; rerun with -h for copyright info
==12== Command: apk add --update cifs-utils
==12==
(1/18) Installing libcap (2.46-r0)
(2/18) Installing keyutils-libs (1.6.3-r0)
(3/18) Installing krb5-conf (1.0-r2)
(4/18) Installing libcom_err (1.45.6-r1)
(5/18) Installing libverto (0.3.1-r1)
  2% ##                                                                                                                ==12== Invalid read of size 8
==12==    at 0x4B6415C: fetch_cache_put (in /lib/libapk.so.3.12.0)
==12==    by 0x4B6804C: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B65200: fetchIO_close (in /lib/libapk.so.3.12.0)
==12==    by 0x4B622F3: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B62564: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B63382: apk_tar_parse (in /lib/libapk.so.3.12.0)
==12==    by 0x4B59759: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B59A04: apk_db_install_pkg (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5CC39: apk_solver_commit_changeset (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5D388: apk_solver_commit (in /lib/libapk.so.3.12.0)
==12==    by 0x10DA7C: ??? (in /sbin/apk)
==12==    by 0x10CC5F: ??? (in /sbin/apk)
==12==  Address 0x51c8640 is 128 bytes inside a block of size 136 free'd
==12==    at 0x48A2794: free (vg_replace_malloc.c:538)
==12==    by 0x4B64A9C: fetch_close (in /lib/libapk.so.3.12.0)
==12==    by 0x4B64152: fetch_cache_put (in /lib/libapk.so.3.12.0)
==12==    by 0x4B6804C: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B65200: fetchIO_close (in /lib/libapk.so.3.12.0)
==12==    by 0x4B622F3: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B62564: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B63382: apk_tar_parse (in /lib/libapk.so.3.12.0)
==12==    by 0x4B59759: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B59A04: apk_db_install_pkg (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5CC39: apk_solver_commit_changeset (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5D388: apk_solver_commit (in /lib/libapk.so.3.12.0)
==12==  Block was alloc'd at
==12==    at 0x48A3737: calloc (vg_replace_malloc.c:760)
==12==    by 0x4B63D13: fetch_reopen (in /lib/libapk.so.3.12.0)
==12==    by 0x4B63F16: fetch_connect (in /lib/libapk.so.3.12.0)
==12==    by 0x4B68D1F: http_request (in /lib/libapk.so.3.12.0)
==12==    by 0x4B6242D: apk_istream_from_fd_url_if_modified (in /lib/libapk.so.3.12.0)
==12==    by 0x4B595CF: ??? (in /lib/libapk.so.3.12.0)
==12==    by 0x4B59A04: apk_db_install_pkg (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5CC39: apk_solver_commit_changeset (in /lib/libapk.so.3.12.0)
==12==    by 0x4B5D388: apk_solver_commit (in /lib/libapk.so.3.12.0)
==12==    by 0x10DA7C: ??? (in /sbin/apk)
==12==    by 0x10CC5F: ??? (in /sbin/apk)
==12==    by 0x401CA02: ??? (in /lib/ld-musl-x86_64.so.1)
==12==
(6/18) Installing krb5-libs (1.18.3-r1)
(7/18) Installing talloc (2.3.1-r0)
(8/18) Installing gmp (6.2.1-r0)
(9/18) Installing nettle (3.7-r0)
(10/18) Installing libffi (3.3-r2)
(11/18) Installing p11-kit (0.23.22-r0)
(12/18) Installing libtasn1 (4.16.0-r1)
(13/18) Installing libunistring (0.9.10-r0)
(14/18) Installing gnutls (3.7.0-r0)
(15/18) Installing tevent (0.10.2-r0)
(16/18) Installing samba-util-libs (4.13.3-r1)
(17/18) Installing libwbclient (4.13.3-r1)
(18/18) Installing cifs-utils (6.12-r0)
Executing busybox-1.32.1-r0.trigger
OK: 119 MiB in 33 packages
==12==
==12== HEAP SUMMARY:
==12==     in use at exit: 262,152 bytes in 2 blocks
==12==   total heap usage: 1,200,046 allocs, 1,200,044 frees, 2,303,615,740 bytes allocated
==12==
==12== LEAK SUMMARY:
==12==    definitely lost: 0 bytes in 0 blocks
==12==    indirectly lost: 0 bytes in 0 blocks
==12==      possibly lost: 0 bytes in 0 blocks
==12==    still reachable: 262,152 bytes in 2 blocks
==12==         suppressed: 0 bytes in 0 blocks
==12== Rerun with --leak-check=full to see details of leaked memory
==12==
==12== For lists of detected and suppressed errors, rerun with: -s
==12== ERROR SUMMARY: 14 errors from 1 contexts (suppressed: 0 from 0)

Does apk create crash dumps so I can first run the failing command, then analyze the dump? I'm not well-versed in Linux debugging, so I will probably require some help.

Thanks for this. I think I know what the issue is, and will soon push a fix. Though, I am wondering what is causing this. Would it be possible to see the repositories file? Is it going through proxy, or some server giving HTTP redirect responses?

> cat /etc/apk/repositories

https://dl-cdn.alpinelinux.org/alpine/v3.13/main  
https://dl-cdn.alpinelinux.org/alpine/v3.13/community

It is going through a proxy.

Is it one or more proxies? Would it be possible to see the proxy related config, and if DNS used, the DNS entries present? Actual IP:s are not needed, I just would like to understand is there a pool of proxies, or single address?

It is a single proxy. Can you give me a list of commands to run so I can answer your other questions?

closed with commit d430a989

mentioned in commit c37b385b

mentioned in commit 719ff51a

Alpine 3.13: Segmentation fault on installing cifs-utils

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