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SubjectRe: Kernel panic during drm/nouveau init 5.3.0-rc7-next-20190903
Adding Gerd and Christian.
-Daniel

On Fri, Sep 20, 2019 at 9:44 PM Alexander Kapshuk
<alexander.kapshuk@gmail.com> wrote:
>
> On Sat, Sep 07, 2019 at 12:05:34PM +0300, Alexander Kapshuk wrote:
> > To Whom It May Concern
> >
> > Every kernel I have built since 5.3.0-rc2-next-20190730 and up to
> > 5.3.0-rc7-next-20190903 has resulted in the kernel panic described below.
> >
> > The panic occurs early on in the boot process, so no records of it get
> > written on disk. I resourted to taking photos and videos to get the info
> > for debugging.
> >
> > [Kernel panic]
> > Code: 00 48 83 bb f0 00 00 00 00 74 16 48 83 c3 18 b9 17 00 00 00 31 c0 48 89 df f3 48 ab 5b 41 5c 5d c3 4c 89 a3 f0 00 00 00 eb e1 <0f> 0b 0f 1f 40 00 55 48 89 e5 41 54 49 89 d4 53 48 89 f3 e8 7e ff
> >
> > Kernel panic - Not syncing: Attempted to kill init! exitcode=0x0000000b.
> >
> > Top of call stack:
> > __drm_fb_helper_initial_config_and_unlock
> > drm_fb_helper_initial_config
> >
> > <scripts/decodecode <~/tmp/panic_code.txt
> > Code: 00 48 83 bb f0 00 00 00 00 74 16 48 83 c3 18 b9 17 00 00 00 31 c0 48 89 df f3 48 ab 5b 41 5c 5d c3 4c 89 a3 f0 00 00 00 eb e1 <0f> 0b 0f 1f 40 00 55 48 89 e5 41 54 49 89 d4 53 48 89 f3 e8 7e ff
> > All code
> > ========
> > 0: 00 48 83 add %cl,-0x7d(%rax)
> > 3: bb f0 00 00 00 mov $0xf0,%ebx
> > 8: 00 74 16 48 add %dh,0x48(%rsi,%rdx,1)
> > c: 83 c3 18 add $0x18,%ebx
> > f: b9 17 00 00 00 mov $0x17,%ecx
> > 14: 31 c0 xor %eax,%eax
> > 16: 48 89 df mov %rbx,%rdi
> > 19: f3 48 ab rep stos %rax,%es:(%rdi)
> > 1c: 5b pop %rbx
> > 1d: 41 5c pop %r12
> > 1f: 5d pop %rbp
> > 20: c3 retq
> > 21: 4c 89 a3 f0 00 00 00 mov %r12,0xf0(%rbx)
> > 28: eb e1 jmp 0xb
> > 2a:* 0f 0b ud2 <-- trapping instruction
> > 2c: 0f 1f 40 00 nopl 0x0(%rax)
> > 30: 55 push %rbp
> > 31: 48 89 e5 mov %rsp,%rbp
> > 34: 41 54 push %r12
> > 36: 49 89 d4 mov %rdx,%r12
> > 39: 53 push %rbx
> > 3a: 48 89 f3 mov %rsi,%rbx
> > 3d: e8 .byte 0xe8
> > 3e: 7e ff jle 0x3f
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: 0f 0b ud2
> > 2: 0f 1f 40 00 nopl 0x0(%rax)
> > 6: 55 push %rbp
> > 7: 48 89 e5 mov %rsp,%rbp
> > a: 41 54 push %r12
> > c: 49 89 d4 mov %rdx,%r12
> > f: 53 push %rbx
> > 10: 48 89 f3 mov %rsi,%rbx
> > 13: e8 .byte 0xe8
> > 14: 7e ff jle 0x15
> >
> > The panic occurs after the 'Driver supports precise vblank timestamp
> > query.' line gets printed to console:
> > [ 2.858970] Linux agpgart interface v0.103
> > [ 2.859308] nouveau 0000:01:00.0: NVIDIA G84 (084300a2)
> > [ 2.968950] nouveau 0000:01:00.0: bios: version 60.84.68.00.19
> > [ 2.989923] nouveau 0000:01:00.0: bios: M0203T not found
> > [ 2.990010] nouveau 0000:01:00.0: bios: M0203E not matched!
> > [ 2.990096] nouveau 0000:01:00.0: fb: 512 MiB DDR2
> > [ 3.062362] [TTM] Zone kernel: Available graphics memory: 2015014 KiB
> > [ 3.062494] [TTM] Initializing pool allocator
> > [ 3.062581] [TTM] Initializing DMA pool allocator
> > [ 3.062683] nouveau 0000:01:00.0: DRM: VRAM: 512 MiB
> > [ 3.062769] nouveau 0000:01:00.0: DRM: GART: 1048576 MiB
> > [ 3.062859] nouveau 0000:01:00.0: DRM: TMDS table version 2.0
> > [ 3.062944] nouveau 0000:01:00.0: DRM: DCB version 4.0
> > [ 3.063030] nouveau 0000:01:00.0: DRM: DCB outp 00: 02000300 00000028
> > [ 3.063117] nouveau 0000:01:00.0: DRM: DCB outp 01: 01000302 00000030
> > [ 3.063203] nouveau 0000:01:00.0: DRM: DCB outp 02: 04011310 00000028
> > [ 3.063290] nouveau 0000:01:00.0: DRM: DCB outp 03: 02011312 00c000b0
> > [ 3.063377] nouveau 0000:01:00.0: DRM: DCB conn 00: 1030
> > [ 3.063462] nouveau 0000:01:00.0: DRM: DCB conn 01: 2130
> > [ 3.065982] nouveau 0000:01:00.0: DRM: MM: using CRYPT for buffer copies
> > [ 3.066622] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
> > [ 3.066754] [drm] Driver supports precise vblank timestamp query.
> >
> > I was not able to capture the value of RIP for this crash.
> >
> > With drm_kms_helper.fbdev_emulation=0 enabled, as documented in
> > the commentary to function drm_fb_helper_initial_config defined in
> > drivers/gpu/drm/drm_fb_helper.c, I get the following output:
> >
> > RIP: 0010: _raw_spin_lock+0x7/0x20
> > Code: ba ff 00 00 00 f0 0f b1 17 75 01 c3 55 48 89 e5 e8 23 a2 6d ff 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 31 c0 ba 01 00 00 00 <f0> 0f b1 17 75 01 c3 55 89 c6 40 89 e5 e8 e7 8f 6d ff 5d c3 0f 1f
> >
> > <scripts/decodecode <~/tmp/panic_code.txt
> > Code: ba ff 00 00 00 f0 0f b1 17 75 01 c3 55 48 89 e5 e8 23 a2 6d ff 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 90 31 c0 ba 01 00 00 00 <f0> 0f b1 17 75 01 c3 55 89 c6 40 89 e5 e8 e7 8f 6d ff 5d c3 0f 1f
> > All code
> > ========
> > 0: ba ff 00 00 00 mov $0xff,%edx
> > 5: f0 0f b1 17 lock cmpxchg %edx,(%rdi)
> > 9: 75 01 jne 0xc
> > b: c3 retq
> > c: 55 push %rbp
> > d: 48 89 e5 mov %rsp,%rbp
> > 10: e8 23 a2 6d ff callq 0xffffffffff6da238
> > 15: 5d pop %rbp
> > 16: c3 retq
> > 17: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1)
> > 1e: 00 00 00 00
> > 22: 90 nop
> > 23: 31 c0 xor %eax,%eax
> > 25: ba 01 00 00 00 mov $0x1,%edx
> > 2a:* f0 0f b1 17 lock cmpxchg %edx,(%rdi) <-- trapping instruction
> > 2e: 75 01 jne 0x31
> > 30: c3 retq
> > 31: 55 push %rbp
> > 32: 89 c6 mov %eax,%esi
> > 34: 40 89 e5 rex mov %esp,%ebp
> > 37: e8 e7 8f 6d ff callq 0xffffffffff6d9023
> > 3c: 5d pop %rbp
> > 3d: c3 retq
> > 3e: 0f .byte 0xf
> > 3f: 1f (bad)
> >
> > Code starting with the faulting instruction
> > ===========================================
> > 0: f0 0f b1 17 lock cmpxchg %edx,(%rdi)
> > 4: 75 01 jne 0x7
> > 6: c3 retq
> > 7: 55 push %rbp
> > 8: 89 c6 mov %eax,%esi
> > a: 40 89 e5 rex mov %esp,%ebp
> > d: e8 e7 8f 6d ff callq 0xffffffffff6d8ff9
> > 12: 5d pop %rbp
> > 13: c3 retq
> > 14: 0f .byte 0xf
> > 15: 1f (bad)
> >
> > (gdb) list *(_raw_spin_lock+0x7)
> > 0xffffffff81a13b27 is in _raw_spin_lock (./arch/x86/include/asm/atomic.h:200).
> > 195 }
> > 196
> > 197 #define arch_atomic_try_cmpxchg arch_atomic_try_cmpxchg
> > 198 static __always_inline bool arch_atomic_try_cmpxchg(atomic_t *v, int *old, int new)
> > 199 {
> > 200 return try_cmpxchg(&v->counter, old, new);
> > 201 }
> > 202
> > 203 static inline int arch_atomic_xchg(atomic_t *v, int new)
> > 204 {
> >
> > (gdb) disassemble _raw_spin_lock+0x7
> > Dump of assembler code for function _raw_spin_lock:
> > 0xffffffff81a13b20 <+0>: xor %eax,%eax
> > 0xffffffff81a13b22 <+2>: mov $0x1,%edx
> > 0xffffffff81a13b27 <+7>: lock cmpxchg %edx,(%rdi)
> > 0xffffffff81a13b2b <+11>: jne 0xffffffff81a13b2e <_raw_spin_lock+14>
> > 0xffffffff81a13b2d <+13>: retq
> > 0xffffffff81a13b2e <+14>: push %rbp
> > 0xffffffff81a13b2f <+15>: mov %eax,%esi
> > 0xffffffff81a13b31 <+17>: mov %rsp,%rbp
> > 0xffffffff81a13b34 <+20>: callq 0xffffffff810ecb20 <queued_spin_lock_slowpath>
> > 0xffffffff81a13b39 <+25>: pop %rbp
> > 0xffffffff81a13b3a <+26>: retq
> > End of assembler dump.
> >
> > Any pointers on how to proceed with this would be appreciated.
>
> 'Git bisect' has identified the following commits as being 'bad'.
>
> b96f3e7c8069b749a40ca3a33c97835d57dd45d2 is the first bad commit
> commit b96f3e7c8069b749a40ca3a33c97835d57dd45d2
> Author: Gerd Hoffmann <kraxel@redhat.com>
> Date: Mon Aug 5 16:01:10 2019 +0200
>
> drm/ttm: use gem vma_node
>
> Drop vma_node from ttm_buffer_object, use the gem struct
> (base.vma_node) instead.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Reviewed-by: Christian König <christian.koenig@amd.com>
> Link: http://patchwork.freedesktop.org/patch/msgid/20190805140119.7337-9-kraxel@redhat.com
>
> drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 2 +-
> drivers/gpu/drm/drm_gem_vram_helper.c | 2 +-
> drivers/gpu/drm/nouveau/nouveau_display.c | 2 +-
> drivers/gpu/drm/nouveau/nouveau_gem.c | 2 +-
> drivers/gpu/drm/qxl/qxl_object.h | 2 +-
> drivers/gpu/drm/radeon/radeon_object.h | 2 +-
> drivers/gpu/drm/ttm/ttm_bo.c | 8 ++++----
> drivers/gpu/drm/ttm/ttm_bo_util.c | 2 +-
> drivers/gpu/drm/ttm/ttm_bo_vm.c | 9 +++++----
> drivers/gpu/drm/virtio/virtgpu_drv.h | 2 +-
> drivers/gpu/drm/virtio/virtgpu_prime.c | 3 ---
> drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 4 ++--
> drivers/gpu/drm/vmwgfx/vmwgfx_surface.c | 4 ++--
> include/drm/ttm/ttm_bo_api.h | 4 ----
> 14 files changed, 21 insertions(+), 27 deletions(-)
>
> I nominated commit '[1e053b10ba60eae6a3f9de64cbc74bdf6cb0e715] drm/ttm:
> use gem reservation object' as being 'good' initially, based on the
> fact that kernel 5.3.0-rc1-00364-g1e053b10ba60 did boot. But the GUI
> applications displayed black artifacts across the screen.
>
> I then edited the git-bisect log file where I nominated
> commit 1e053b10ba60eae6a3f9de64cbc74bdf6cb0e715 as being
> 'bad' and ran 'git bisect replay' on it. This blamed commit
> 1e053b10ba60eae6a3f9de64cbc74bdf6cb0e715 as the first bad commit.
>
> 1e053b10ba60eae6a3f9de64cbc74bdf6cb0e715 is the first bad commit
> commit 1e053b10ba60eae6a3f9de64cbc74bdf6cb0e715
> Author: Gerd Hoffmann <kraxel@redhat.com>
> Date: Mon Aug 5 16:01:09 2019 +0200
>
> drm/ttm: use gem reservation object
>
> Drop ttm_resv from ttm_buffer_object, use the gem reservation object
> (base._resv) instead.
>
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Reviewed-by: Christian König <christian.koenig@amd.com>
> Link: http://patchwork.freedesktop.org/patch/msgid/20190805140119.7337-8-kraxel@redhat.com
>
> drivers/gpu/drm/ttm/ttm_bo.c | 39 +++++++++++++++++++++++----------------
> drivers/gpu/drm/ttm/ttm_bo_util.c | 2 +-
> include/drm/ttm/ttm_bo_api.h | 1 -
> 3 files changed, 24 insertions(+), 18 deletions(-)
>
>
> In the process of bisection, I nominated the following kernels as being
> 'bad'. They also booted fine, but the xserver would fail to start. I
> have attached the error messages generated by xorg.
>
> # kernel boots; Xorg won't start. See Xorg_err.log attached.
> 5.3.0-rc3-01537-g6a3068065fa4
> 5.3.0-rc3-00782-gb0383c0653c4
> 5.3.0-rc1-00391-g54fc01b775fe
> 5.3.0-rc1-00366-g2e3c9ec4d151
> 5.3.0-rc1-00365-gb96f3e7c8069
>
> Today, I upgraded the kernel to 5.3.0-next-20190919, which booted fine
> with no Xorg regressions to report.
>
> Just wondering if the earlier kernels would not boot for me because of
> the changes introduced by the 'bad' commits being perhaps incomplete?
>
> Thanks to all of you for the tips on how proceed with bisection.



--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch

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