Re: [ANNOUNCE] v5.9-rc3-rt3

[Mike Galbraith]

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.

      KERNEL: vmlinux-5.9.0.gf4d51df-rt5-rt.gz
    DUMPFILE: vmcore
        CPUS: 8
        DATE: Wed Sep  9 04:41:24 2020
      UPTIME: 00:08:10
LOAD AVERAGE: 3.17, 1.86, 0.99
       TASKS: 715
    NODENAME: homer
     RELEASE: 5.9.0.gf4d51df-rt5-rt
     VERSION: #1 SMP PREEMPT_RT Wed Sep 9 03:22:01 CEST 2020
     MACHINE: x86_64  (3591 Mhz)
      MEMORY: 16 GB
       PANIC: ""
         PID: 2146
     COMMAND: "X"
        TASK: ffff994c7fad0000  [THREAD_INFO: ffff994c7fad0000]
         CPU: 0
       STATE: TASK_RUNNING (PANIC)

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
 #9 [ffffbfffc11a79d0] nvif_mem_ctor_type at ffffffffc07eef48 [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nvif/mem.c: 74
#10 [ffffbfffc11a7aa8] nouveau_mem_vram at ffffffffc08b5291 [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_mem.c: 155
#11 [ffffbfffc11a7b10] nouveau_vram_manager_new at ffffffffc08b594d [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_ttm.c: 76
#12 [ffffbfffc11a7b30] ttm_bo_mem_space at ffffffffc05af2ac [ttm]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/ttm/ttm_bo.c: 1065
#13 [ffffbfffc11a7b88] ttm_bo_validate at ffffffffc05afaca [ttm]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/ttm/ttm_bo.c: 1137
#14 [ffffbfffc11a7c18] ttm_bo_init_reserved at ffffffffc05afe70 [ttm]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/ttm/ttm_bo.c: 1330
#15 [ffffbfffc11a7c60] ttm_bo_init at ffffffffc05afff7 [ttm]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/ttm/ttm_bo.c: 1364
#16 [ffffbfffc11a7cc8] nouveau_bo_init at ffffffffc08b0f7b [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_bo.c: 317
#17 [ffffbfffc11a7d38] nouveau_gem_new at ffffffffc08b2f7b [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_gem.c: 206
#18 [ffffbfffc11a7d70] nouveau_gem_ioctl_new at ffffffffc08b3001 [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_gem.c: 272
#19 [ffffbfffc11a7da0] drm_ioctl_kernel at ffffffffc066f564 [drm]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/drm_ioctl.c: 793
#20 [ffffbfffc11a7de0] drm_ioctl at ffffffffc066f88e [drm]
    /backup/usr/local/src/kernel/linux-master-rt/./include/linux/uaccess.h: 168
#21 [ffffbfffc11a7ed0] nouveau_drm_ioctl at ffffffffc08abf56 [nouveau]
    /backup/usr/local/src/kernel/linux-master-rt/drivers/gpu/drm/nouveau/nouveau_drm.c: 1163
#22 [ffffbfffc11a7f08] __x64_sys_ioctl at ffffffffb733255e
    /backup/usr/local/src/kernel/linux-master-rt/fs/ioctl.c: 49
#23 [ffffbfffc11a7f40] do_syscall_64 at ffffffffb79a25c3
    /backup/usr/local/src/kernel/linux-master-rt/arch/x86/entry/common.c: 46
#24 [ffffbfffc11a7f50] entry_SYSCALL_64_after_hwframe at ffffffffb7a0008c
    /backup/usr/local/src/kernel/linux-master-rt/arch/x86/entry/entry_64.S: 125
    RIP: 00007f96707a6ac7  RSP: 00007ffc1cbc2998  RFLAGS: 00000246
    RAX: ffffffffffffffda  RBX: 000055743cf152e0  RCX: 00007f96707a6ac7
    RDX: 00007ffc1cbc29f0  RSI: 00000000c0306480  RDI: 000000000000000e
    RBP: 00007ffc1cbc29f0   R8: 0000000000000000   R9: 0000000000000003
    R10: fffffffffffffd98  R11: 0000000000000246  R12: 00000000c0306480
    R13: 000000000000000e  R14: 000055743ce99040  R15: 000055743c60cfd0
    ORIG_RAX: 0000000000000010  CS: 0033  SS: 002b