debcrafters-packages team mailing list archive

[Heinrich Schuchardt <2123828@xxxxxxxxxxxxxxxxxx>]

On s390x the riscv64 opcode `lhu     a4,0(a5)` is incorrectly executed
in the code segment.

Here is the disassembly:

    e73e:       00873f03                ld      t5,8(a4)
    e742:       0044de03                lhu     t3,4(s1)
    e746:       1a079e63                bnez    a5,e902 <_dl_check_map_versions+0x2be>
    e74a:       18893783                ld      a5,392(s2)
    e74e:       18078163                beqz    a5,e8d0 <_dl_check_map_versions+0x28c>
    e752:       679c                    ld      a5,8(a5)
    e754:       5e078763                beqz    a5,ed42 <_dl_check_map_versions+0x6fe>
    e758:       00093703                ld      a4,0(s2)
    e75c:       01df0533                add     a0,t5,t4
// def = (ElfW(Verdef) *) ((char *) map->l_addr + def_offset);  
    e760:       97ba                    add     a5,a5,a4
// $a4 = def->vd_version
// This opcode is incorrectly interpreted. Byte sequence \x01 \x00 is loaded as 0x100.
    e762:       8798                    lhu     a4,0(a5)
// if (__builtin_expect (def->vd_version, 1) != 1)
    e764:       01a71d63                bne     a4,s10,e77e <_dl_check_map_versions+0x13a>

-- 
You received this bug notification because you are a member of
Debcrafters packages, which is subscribed to glibc in Ubuntu.
https://bugs.launchpad.net/bugs/2123828

Title:
  unsupported version 256 of Verdef record when running qemu-riscv64 on
  s390x

Status in gcc-15 package in Ubuntu:
  New
Status in glibc package in Ubuntu:
  New
Status in qemu package in Ubuntu:
  New

Bug description:
  QEMU's DEP-8 test fails on s390x, due to warning output on stderr
  about "unsupported version 256 of Verdef record", which is blocking
  migration of glibc 2.42-0ubuntu3.

  Minimal reproducer:
  ```
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt update && sudo apt install qemu-user
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg -l | grep libc6
  ii  libc6:s390x                           2.42-0ubuntu3
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg -l | grep qemu-user
  ii  qemu-user                             1:10.1.0+ds-5ubuntu1
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ dpkg --print-architecture
  s390x
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo dpkg --add-architecture riscv64
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt update
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ sudo apt install hello:riscv64
  ubuntu@slyon-lp-2123828-slyon-glibc-qemu-riscv64:~$ /usr/bin/qemu-riscv64 /usr/bin/hello
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  /usr/bin/hello: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  ```

  DEP-8 logs:
  """
  323s === Checking if /usr/bin/qemu-riscv64 can run executables:
  323s glob with sh: /usr/bin/qemu-riscv64 /bin/busybox ash -c "/usr/bin/qemu-riscv64 /bin/busybox ls -dCFl debian/*[t]*":
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libresolv.so.2: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s
  323s Reading package lists.../bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/riscv64-linux-gnu/libc.so.6: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  323s Expected output not found
  [...]
  328s autopkgtest [22:14:52]: @@@@@@@@@@@@@@@@@@@@ summary
  328s test-qemu-img.sh     PASS (superficial)
  328s test-qemu-system.sh  PASS (superficial)
  328s test-qemu-user.sh    FAIL stderr: /bin/busybox: /lib/ld-linux-riscv64-lp64d.so.1: unsupported version 256 of Verdef record
  """

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gcc-15/+bug/2123828/+subscriptions