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From: "romain.naour at gmail dot com" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug c/98784] New: [gcc 8.4/9.3/10] sparcv8 regression Date: Thu, 21 Jan 2021 22:13:09 +0000 [thread overview] Message-ID: <bug-98784-4@http.gcc.gnu.org/bugzilla/> (raw) https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98784 Bug ID: 98784 Summary: [gcc 8.4/9.3/10] sparcv8 regression Product: gcc Version: 10.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c Assignee: unassigned at gcc dot gnu.org Reporter: romain.naour at gmail dot com Target Milestone: --- Hello, When building a rootfs for sparcv8 using the Buildroot defconfig qemu_sparc_ss10_defconfig, the system produce some illegal instruction messages. gcc 8.3, 9.2 are the latest working gcc version. git bisect between gcc 8.3 and 8.4 allowed to identify the commit that introduced the regression: https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=0a83f1a441d7aaadecb368c237b6ee70bd7b91d6 The commit has been introduced to fix the following bub: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92095 It has been backported to gcc 8.4 and 9.3. Reverting this patch allowed to produce a working rootfs. This issue can be reproduced using the following steps: $ git://git.busybox.net/buildroot $ cd buildroot/ $ git checkout 2020.11.1 $ make qemu_sparc_ss10_defconfig $ make $ ./output/images/start-qemu.sh The kernel boot correctly but the login program (busybox) crash while trying to login: [...] Starting syslogd: Welcome to Buildroot buildroot login: root Welcome to Buildroot buildroot login: root For now, It's just a basic test that allow to reproduce the issue. We can use a shell instead of init program but even with a simple command such 'ls' the system crash: sh-5.0# ls CPU: 0 PID: 1 Comm: sh Not tainted 4.19.16 #1 [f0022fbc : do_exit+0x948/0x968 ] [f000afec : do_signal+0x5f8/0x79c ] [f000b4b4 : do_notify_resume+0x48/0x58 ] [f0008c88 : signal_p+0x14/0x24 ] [0004b874 : 0x4b874 ] Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000004 Best regards, Romain
next reply other threads:[~2021-01-21 22:13 UTC|newest] Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-21 22:13 romain.naour at gmail dot com [this message] 2021-01-21 23:01 ` [Bug c/98784] " ebotcazou at gcc dot gnu.org 2021-01-21 23:26 ` romain.naour at gmail dot com 2021-01-21 23:43 ` ebotcazou at gcc dot gnu.org 2021-01-22 7:33 ` [Bug target/98784] [8/9/10/11 Regression] " rguenth at gcc dot gnu.org 2021-01-23 11:43 ` romain.naour at gmail dot com 2021-01-23 17:33 ` ebotcazou at gcc dot gnu.org 2021-01-23 20:07 ` romain.naour at gmail dot com 2021-01-23 21:56 ` [Bug target/98784] [8/9/10/11 Regression] problematic build of uClibc with -fPIC ebotcazou at gcc dot gnu.org 2021-01-24 9:17 ` ebotcazou at gcc dot gnu.org 2021-01-26 21:24 ` romain.naour at gmail dot com 2021-01-26 22:29 ` romain.naour at gmail dot com 2021-04-09 8:08 ` rguenth at gcc dot gnu.org 2021-05-14 9:54 ` [Bug target/98784] [9/10/11/12 " jakub at gcc dot gnu.org 2021-06-01 8:19 ` rguenth at gcc dot gnu.org 2021-06-28 16:40 ` yann at sionneau dot net 2021-06-28 16:50 ` yann at sionneau dot net 2022-05-27 9:44 ` [Bug target/98784] [10/11/12/13 " rguenth at gcc dot gnu.org 2022-06-28 10:43 ` jakub at gcc dot gnu.org 2023-07-07 10:38 ` [Bug target/98784] [11/12/13/14 " rguenth at gcc dot gnu.org 2023-08-08 9:51 ` wbx at openadk dot org 2024-04-30 15:05 ` [Bug target/98784] [11/12/13/14/15 " dm.chestnykh at gmail dot com 2024-04-30 17:55 ` dm.chestnykh at gmail dot com 2024-04-30 17:59 ` pinskia at gcc dot gnu.org
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