On 2020-09-09 07:45:22 [+0200], Mike Galbraith wrote: > On Wed, 2020-09-09 at 05:12 +0200, Mike Galbraith wrote: > > On Wed, 2020-09-02 at 17:55 +0200, Sebastian Andrzej Siewior wrote: > > > > > > Known issues > > > - It has been pointed out that due to changes to the printk code the > > > internal buffer representation changed. This is only an issue if tools > > > like `crash' are used to extract the printk buffer from a kernel memory > > > image. > > > > Ouch. While installing -rt5 on lappy via nfs, -rt5 server box exploded > > leaving nada in logs. I have a nifty crash dump of the event, but... > > After convincing crash (with club) that it didn't _really_ need a > log_buf, nfs had nothing to do with the crash, it was nouveau. okay. Line 280 is hard to understand. My guess is that we got a pointer and then the boom occurred but I can't tell why/how. A few lines later there is args->x = y… Do you see the lockdep splat without nouveau? > crash> bt -l > PID: 2146 TASK: ffff994c7fad0000 CPU: 0 COMMAND: "X" > #0 [ffffbfffc11a76c8] machine_kexec at ffffffffb7064879 > /backup/usr/local/src/kernel/linux-master-rt/./include/linux/ftrace.h: 792 > #1 [ffffbfffc11a7710] __crash_kexec at ffffffffb7173622 > /backup/usr/local/src/kernel/linux-master-rt/kernel/kexec_core.c: 963 > #2 [ffffbfffc11a77d0] crash_kexec at ffffffffb7174920 > /backup/usr/local/src/kernel/linux-master-rt/./arch/x86/include/asm/atomic.h: 41 > #3 [ffffbfffc11a77e0] oops_end at ffffffffb702716f > /backup/usr/local/src/kernel/linux-master-rt/arch/x86/kernel/dumpstack.c: 342 > #4 [ffffbfffc11a7800] exc_general_protection at ffffffffb79a2fc6 > /backup/usr/local/src/kernel/linux-master-rt/arch/x86/kernel/traps.c: 82 > #5 [ffffbfffc11a7890] asm_exc_general_protection at ffffffffb7a00a1e > /backup/usr/local/src/kernel/linux-master-rt/./arch/x86/include/asm/idtentry.h: 532 > #6 [ffffbfffc11a78a0] nvif_object_ctor at ffffffffc07ee6a7 [nouveau] > /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nvif/object.c: 280 > #7 [ffffbfffc11a7918] __kmalloc at ffffffffb72eea12 > /backup/usr/local/src/kernel/linux-master-rt/mm/slub.c: 261 > #8 [ffffbfffc11a7980] nvif_object_ctor at ffffffffc07ee6a7 [nouveau] > /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nvif/object.c: 280 Sebastian
