I have installed libunwind=1.6.2-0ubuntu1.1 on my 16K page arm machine and verified that the xorg crash is indeed fixed with this version. To make sure it also does not negatively affect other hardware configurations I also tested on my amd64 desktop and found that everything still works without regressions after the update.
To test the functionality of the library I installed libunwind-dev=1.6.2-0ubuntu1.1 and ran the libunwind examples from https://github.com/daniel-thompson/libunwind-examples The results look good: $USER:~/libunwind-examples$ ./unwind-local 0x55d35d0d644c: (cmp+0xe) 0x7f927ac3d33c: (bsearch+0x5c) 0x55d35d0d61fc: (main+0x5c) 0x7f927ac23510: (__libc_init_first+0x90) 0x7f927ac235c9: (__libc_start_main+0x89) 0x55d35d0d6245: (_start+0x25) ** Tags removed: verification-needed-kinetic ** Tags added: verification-done-kinetic -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to libunwind in Ubuntu. https://bugs.launchpad.net/bugs/2004039 Title: libunwind 1.6.2-0 assumes 4k page sizes and crashes on systems with bigger page sizes Status in libunwind package in Ubuntu: Fix Released Status in libunwind source package in Kinetic: Fix Committed Bug description: [ Impact ] * On kernels with page size > 4K Xorg (and presumably other applications relying on libunwind) crashes on startup. This affects anyone running the official arm64 generic-64k kernel or custom non 4k kernels (as used by e.g. apple silicon). The exact error I am seeing in the logs is: Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) 0: /usr/lib/xorg/Xorg (OsLookupColor+0x188) [0xaaab456ca998] Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) unw_get_proc_info failed: no unwind info found [-10] Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Segmentation fault at address 0x0 Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: Fatal server error: Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Caught signal 11 (Segmentation fault). Server aborting Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: Please consult the The X.Org Foundation support Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: at http://wiki.x.org Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: for help. Jan 30 11:16:20 ubuntu /usr/libexec/gdm-x-session[3199]: (EE) I have not found a workaround other than using wayland (which has other limitations). To reproduce use a kernel configured with a page size of 16K (CONFIG_ARM64_16K_PAGES=y or CONFIG_ARM64_64K_PAGES=y or) and try to start "Ubuntu on Xorg" in gdm. [ Test Plan ] * Make sure Xorg doesn't crash on 4K, 16K and 64K kernels. [ Where problems could occur ] * We will have to make sure the fixed version still works with 4k kernels. The patch is already widely in use so the risk seems low if we test properly. [ Other Info ] * The lunar version ships the bug fix synced from debian * Debian bug: https://bugs.debian.org/cgi- bin/bugreport.cgi?bug=1026217 * Upstream fix: https://github.com/libunwind/libunwind/commit/e85b65cec757ef589f28957d0c6c21c498a03bdf To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/2004039/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
