Public bug reported:
I'm seeing this appear fairly regularly in dmesg:
[23630.791701] nouveau 0000:02:00.0: swiotlb buffer is full (sz: 2097152 bytes)
[23630.791703] swiotlb: coherent allocation failed for device 0000:02:00.0
size=2097152
[23630.791706] CPU: 12 PID: 2609 Comm: gnome-shell Not tainted 4.15.0-9-generic
#10-Ubuntu
[23630.791709] Hardware name: Intel Corp. GRANTLEY/GRANTLEY, BIOS
GRNDCRB1.86B.0032.R02.1405090848 05/09/2014
[23630.791710] Call Trace:
[23630.791718] dump_stack+0x63/0x8b
[23630.791723] swiotlb_alloc_coherent+0xe8/0x160
[23630.791728] x86_swiotlb_alloc_coherent+0x43/0x50
[23630.791734] ttm_dma_pool_get_pages+0x1f1/0x5b0 [ttm]
[23630.791737] ttm_dma_populate+0x249/0x330 [ttm]
[23630.791770] nouveau_ttm_tt_populate+0x156/0x1f0 [nouveau]
[23630.791773] ttm_tt_bind+0x2e/0x60 [ttm]
[23630.791776] ttm_bo_handle_move_mem+0x589/0x5c0 [ttm]
[23630.791779] ? ttm_bo_mem_space+0x39d/0x470 [ttm]
[23630.791782] ttm_bo_validate+0x144/0x160 [ttm]
[23630.791784] ttm_bo_init_reserved+0x393/0x430 [ttm]
[23630.791787] ttm_bo_init+0x2d/0x90 [ttm]
[23630.791808] ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
[23630.791827] nouveau_bo_new+0x40c/0x580 [nouveau]
[23630.791847] ? nouveau_bo_invalidate_caches+0x10/0x10 [nouveau]
[23630.791866] nouveau_gem_new+0x60/0x130 [nouveau]
[23630.791883] nouveau_gem_ioctl_new+0x59/0xe0 [nouveau]
[23630.791899] ? nouveau_gem_new+0x130/0x130 [nouveau]
[23630.791912] drm_ioctl_kernel+0x5f/0xb0 [drm]
[23630.791919] drm_ioctl+0x31b/0x3d0 [drm]
[23630.791936] ? nouveau_gem_new+0x130/0x130 [nouveau]
[23630.791954] nouveau_drm_ioctl+0x72/0xc0 [nouveau]
[23630.791957] do_vfs_ioctl+0xa8/0x630
[23630.791961] ? __sys_recvmsg+0x80/0x90
[23630.791964] SyS_ioctl+0x79/0x90
[23630.791967] do_syscall_64+0x76/0x130
[23630.791971] entry_SYSCALL_64_after_hwframe+0x21/0x86
[23630.791972] RIP: 0033:0x7f26f5357ea7
[23630.791973] RSP: 002b:00007ffe50c20ee8 EFLAGS: 00000246 ORIG_RAX:
0000000000000010
[23630.791975] RAX: ffffffffffffffda RBX: 00005570b6b1b490 RCX: 00007f26f5357ea7
[23630.791975] RDX: 00007ffe50c20f40 RSI: 00000000c0306480 RDI: 000000000000000b
[23630.791976] RBP: 00007ffe50c20f40 R08: 0000000000000004 R09: 00005570b6b1b490
[23630.791977] R10: 0000000000000030 R11: 0000000000000246 R12: 00000000c0306480
[23630.791977] R13: 000000000000000b R14: 00005570b6ad5b88 R15: 00005570b0ad0690
This seems to be due to an attempt to allocate using huge pages, which
has a fallback to allocating normal pages. There are patches in 4.16-rc1
to suppress this spam; backport them to bionic.
** Affects: linux (Ubuntu)
Importance: Medium
Assignee: Seth Forshee (sforshee)
Status: In Progress
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https://bugs.launchpad.net/bugs/1749202
Title:
"swiotlb: coherent allocation failed" dmesg spam with linux
4.15.0-9.10
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