Bugzilla – Bug 1048495
GCC 7 causes segfault illegal instruction in glibc with sse instructions using misaligned data on AMD Ryzen
Last modified: 2017-07-17 06:49:55 UTC
Ref arch bug report https://bugs.archlinux.org/task/54136 0xf7a247c3 in __strspn_sse42 () from /lib/libc.so.6 The rest of the back trace is irrelevant as it's caused by misaligned data according to the arch BR. Glibc Version : 2.25-2.4 Workaround compile flag is -mstackrealign at cost of performance. Not sure if GCC or Ryzen bug. I am trying to test a specific znver1 build but having trouble getting obs not to error with illegal instruction (irony). Reproduction: run civ 5 or borderlands 2 on tumbleweed - it errors when loading the pulse audio config, same as the arch report.
Two systems trying to run Borderlands The Pre Sequel FX-8350 PID: 18055 (BorderlandsPreS) UID: 1000 (donotreveal) GID: 100 (users) Signal: 11 (SEGV) Timestamp: Thu 2017-07-13 17:20:13 CEST (7h ago) Command Line: ./BorderlandsPreSequel Executable: /home/donotreveal/.local/share/Steam/steamapps/common/BorderlandsPreSequel/BorderlandsPreSequel Control Group: /user.slice/user-1000.slice/session-1.scope Unit: session-1.scope Slice: user-1000.slice Session: 1 Owner UID: 1000 (donotreveal) Boot ID: 05c2257f075349dabf4960d9d29509c1 Machine ID: 1c7c62a63be84fd781460dd56d719407 Hostname: whitebox Storage: none Message: Process 18055 (BorderlandsPreS) of user 1000 dumped core. [11400.228620] traps: BorderlandsPreS[18055] general protection ip:f712c7c3 sp:ffd53354 error:0 in libc-2.25.so[f6fe3000+1ba000] Ryzen 1800X PID: 3961 (BorderlandsPreS) UID: 1000 (donotreveal) GID: 100 (users) Signal: 11 (SEGV) Timestamp: Thu 2017-07-13 23:11:26 CEST (1min 21s ago) Command Line: /mnt/DATA-DISK/Steam/steamapps/common/BorderlandsPreSequel/./BorderlandsPreSequel -nostartupmovies Executable: /mnt/DATA-DISK/Steam/steamapps/common/BorderlandsPreSequel/BorderlandsPreSequel Control Group: /user.slice/user-1000.slice/session-1.scope Unit: session-1.scope Slice: user-1000.slice Session: 1 Owner UID: 1000 (donotreveal) Boot ID: 5ee62d5fef9041a89d559f80ab3a9c6e Machine ID: 45ab74373cc743cd912aaceb9086c517 Hostname: blackbox Storage: none Message: Process 3961 (BorderlandsPreS) of user 1000 dumped core. Coredump entry has no core attached (neither internally in the journal nor externally on disk). [33245.303587] traps: BorderlandsPreS[3961] general protection ip:f722a7c3 sp:ffa274f4 error:0 in libc-2.25.so[f70e1000+1ba000] Both point to libc. Not just reserved for Ryzen it seems.
. *** This bug has been marked as a duplicate of bug 1048861 ***