On Mon, Jul 12, 2021 at 12:08 AM Jon Masters jcm@jonmasters.org wrote:
I happened to be installing a Fedora 34 (x86) VM for something and did a test kernel compile that hung on boot. Setting up a serial console I get the below backtrace from ttm but I have not had chance to look at it.
It's a NULL pointer in qxl_bo_delete_mem_notify(), with the code disassembling to
16: 55 push %rbp 17: 48 89 fd mov %rdi,%rbp 1a: e8 a2 02 00 00 callq 0x2c1 1f: 84 c0 test %al,%al 21: 74 0d je 0x30 23: 48 8b 85 68 01 00 00 mov 0x168(%rbp),%rax 2a:* 83 78 10 03 cmpl $0x3,0x10(%rax) <-- trapping instruction 2e: 74 02 je 0x32 30: 5d pop %rbp 31: c3 retq
and that "cmpl $3" looks exactly like that
if (bo->resource->mem_type == TTM_PL_PRIV
and the bug is almost certainly from commit d3116756a710 ("drm/ttm: rename bo->mem and make it a pointer"), which did
- if (bo->mem.mem_type == TTM_PL_PRIV ... + if (bo->resource->mem_type == TTM_PL_PRIV ...
and claimed "No functional change".
But clearly the "bo->resource" pointer is NULL.
Added guilty parties and dri-devel mailing list.
Christian? Full report at
https://lore.kernel.org/lkml/a9473821-1d53-0037-7590-aeaf8e85e72a@jonmasters...
but there's not a whole lot else there that is interesting except for the call trace:
ttm_bo_cleanup_memtype_use+0x22/0x60 [ttm] ttm_bo_release+0x1a1/0x300 [ttm] ttm_bo_delayed_delete+0x1be/0x220 [ttm] ttm_device_delayed_workqueue+0x18/0x40 [ttm] process_one_work+0x1ec/0x390 worker_thread+0x53/0x3e0
so it's presumably the cleanup phase and perhaps "bo->resource" has been deallocated and cleared?
Linus