* Michael Tokarev: > 04.02.2023 23:19, Hilko Bengen wrote: >> Package: src:qemu >> Version: 1:7.2+dfsg-2 > .. >> qemu-img create -f qcow2 -o preallocation=metadata blank-disk-1s.qcow2 >> 512 >> would hang in what appears a tight loop (100% CPU). > > Does 7.2+dfsg-1 work? > > I don't have s390x environment so have no way to deal with this one.
No, it doesn't. On the porterbox (zelenka.debian.org) I was only able to install 1:7.2+dfsg-1+b1 without rebuilding. The last non-failing build before[1] also used 1:7.2+dfsg-1+b1, though. This made me think that the hang might be related to a shared library that had been updated since. Breaking into the running process tells us that it hangs within ppoll and continuing "heals" the situation as before: ,---- | (bookworm_s390x-dchroot)bengen@zelenka:~$ gdb -p 2497762 | GNU gdb (Debian 12.1-4+b1) 12.1 | Copyright (C) 2022 Free Software Foundation, Inc. | License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html> | This is free software: you are free to change and redistribute it. | There is NO WARRANTY, to the extent permitted by law. | Type "show copying" and "show warranty" for details. | This GDB was configured as "s390x-linux-gnu". | Type "show configuration" for configuration details. | For bug reporting instructions, please see: | <https://www.gnu.org/software/gdb/bugs/>. | Find the GDB manual and other documentation resources online at: | <http://www.gnu.org/software/gdb/documentation/>. | | For help, type "help". | Type "apropos word" to search for commands related to "word". | Attaching to process 2497762 | [New LWP 2497763] | [Thread debugging using libthread_db enabled] | Using host libthread_db library "/lib/s390x-linux-gnu/libthread_db.so.1". | 0x000003ff988081ee in ppoll () from /lib/s390x-linux-gnu/libc.so.6 | (gdb) bt | #0 0x000003ff988081ee in ppoll () from /lib/s390x-linux-gnu/libc.so.6 | #1 0x000002aa27deb648 in ?? () | #2 0x000002aa27deac92 in aio_poll () | #3 0x000002aa27cffccc in bdrv_create () | #4 0x000002aa27d0a9e6 in bdrv_img_create () | #5 0x000002aa27cea004 in _start () | (gdb) c | Continuing. | [New Thread 0x3ff977fd8c0 (LWP 2497916)] | [Thread 0x3ff980ff8c0 (LWP 2497763) exited] | [Thread 0x3ff9936bb80 (LWP 2497762) exited] | [Thread 0x3ff977fd8c0 (LWP 2497916) exited] | [New process 2497762] | [Inferior 1 (process 2497762) exited normally] `---- Looks like the only candidatee may be libc which was at 2.36-7 for the last working build and got upgraded to 2.36-8 before things started to go wrong. Cheers, -Hilko [1] https://buildd.debian.org/status/logs.php?pkg=libguestfs&arch=s390x
