Kernel crashed in vma_create when running Xorg

I run into several Xorg lockups today, probably related to the ubuntu update yesterday.

System logs show protection faults

ov  4 18:29:16 t420-work-1 kernel: [   65.348505] audit: type=1326 audit(1604510956.007:5): auid=4294967295 uid=1000 gid=1000 ses=4294967295 subj=? pid=3831 comm="chrome" exe="/snap/chromium/1373/usr/lib/chromium-browser/chrome" sig=0 arch=c000003e syscall=203 compat=0 ip=0x7f2181738b9f code=0x50000
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243407] general protection fault, probably for non-canonical address 0x8da920ca67cf08af: 0000 [#1] SMP PTI
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243420] CPU: 0 PID: 1239 Comm: Xorg Tainted: G     U     OE     5.8.0-26-generic #27-Ubuntu
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243425] Hardware name: LENOVO 42367H8/42367H8, BIOS 83ET76WW (1.46 ) 07/05/2013
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243439] RIP: 0010:kmem_cache_alloc+0x7e/0x230
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243445] Code: 95 01 00 00 4d 8b 07 65 49 8b 50 08 65 4c 03 05 a0 59 53 4f 4d 8b 20 4d 85 e4 0f 84 81 01 00 00 41 8b 47 20 49 8b 3f 4c 01 e0 <48> 8b 18 48 89 c1 49 33 9f 70 01 00 00 4c 89 e0 48 0f c9 48 31 cb
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243450] RSP: 0018:ffff9dc680d379b0 EFLAGS: 00010286
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243456] RAX: 8da920ca67cf08af RBX: 0000000000000000 RCX: 0000000000000002
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243459] RDX: 0000000000015be1 RSI: 0000000000000dc0 RDI: 00003436e7a03380
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243463] RBP: ffff9dc680d379e0 R08: ffffbdc67fc03380 R09: 0000000000000000
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243466] R10: 0000000000000000 R11: ffff898f5c1db6c2 R12: 8da920ca67cf0757
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243469] R13: 0000000000000dc0 R14: ffff898f8d0ea840 R15: ffff898f8d0ea840
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243474] FS:  00007f4f26725a40(0000) GS:ffff898f98200000(0000) knlGS:0000000000000000
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243478] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243481] CR2: 0000351fe3e10000 CR3: 0000000180686001 CR4: 00000000000606f0
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243484] Call Trace:
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243671]  ? vma_create+0x30/0x460 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243789]  vma_create+0x30/0x460 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243798]  ? mutex_lock+0x13/0x40
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.243944]  i915_vma_instance+0xd2/0xe0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244092]  eb_lookup_vma+0xd7/0x1c0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244200]  eb_lookup_vmas+0x79/0x200 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244295]  eb_relocate+0x18/0x1b0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244383]  i915_gem_do_execbuffer+0x265/0x8d0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244395]  ? sg_init_table+0x15/0x40
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244401]  ? __sg_alloc_table+0x6f/0x170
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244409]  ? kvfree+0x2a/0x30
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244417]  ? __kmalloc_node+0x201/0x300
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244510]  i915_gem_execbuffer2_ioctl+0x237/0x4a0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244606]  ? intel_engines_add_sysfs+0x150/0x150 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244615]  ? radix_tree_lookup+0xd/0x10
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244711]  ? i915_gem_execbuffer_ioctl+0x2e0/0x2e0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244763]  drm_ioctl_kernel+0xae/0xf0 [drm]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244810]  drm_ioctl+0x238/0x3d0 [drm]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244911]  ? i915_gem_execbuffer_ioctl+0x2e0/0x2e0 [i915]
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244921]  ? fput+0x13/0x15
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244928]  ? __sys_recvmsg+0x94/0xb0
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244934]  ksys_ioctl+0x8e/0xc0
Nov  4 19:08:26 t420-work-1 kernel: [ 2416.244939]  __x64_sys_ioctl+0x1a/0x20

From that I found this ubuntu bug report: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1901563 The ubuntu bug mentions #1201 (closed) , but I don't see a related stack trace there, so I'm opening a new issue. Any suggestions?

Thanks, Bernd

changed the description

The slab cache is corrupt, i915 would appear to be a victim.

Yeah, hard to say what what is the root cause for the kmem_cache issue. I'm closing it, as it seems to have gone after switching from kernel 5.8.x to 5.9.3. Probably would be good to track it down to back port the fix, but no time for that, as this crashes my main work system.

closed