On Thursday, 6 May 2021 04:50:06 CEST Coly Li wrote:
> Could you please try the attached patch ?  If a suspicious bio
> allocation happens, this patch will print out a warning kernel message
> and avoid the BUG() panic.

Looks like the patch works. Here's a dmesg log that comes from starting
up a game with a bunch of large files (which I'm guessing are what
makes this happen more often?)

[   39.284230] bcache: cached_dev_cache_miss() inserting bio is too large: 344 iovecs, not intsert.
[   65.415896] bcache: cached_dev_cache_miss() inserting bio is too large: 282 iovecs, not intsert.
[   65.446327] bcache: cached_dev_cache_miss() inserting bio is too large: 946 iovecs, not intsert.
[   88.116826] bcache: cached_dev_cache_miss() inserting bio is too large: 342 iovecs, not intsert.
[   88.957691] bcache: cached_dev_cache_miss() inserting bio is too large: 342 iovecs, not intsert.
[   89.020544] bcache: cached_dev_cache_miss() inserting bio is too large: 332 iovecs, not intsert.
[   90.531875] bcache: cached_dev_cache_miss() inserting bio is too large: 261 iovecs, not intsert.
[  111.464124] bcache: cached_dev_cache_miss() inserting bio is too large: 342 iovecs, not intsert.
[  111.497049] bcache: cached_dev_cache_miss() inserting bio is too large: 262 iovecs, not intsert.
[  111.638928] bcache: cached_dev_cache_miss() inserting bio is too large: 318 iovecs, not intsert.
[  155.884142] bcache: cached_dev_cache_miss() inserting bio is too large: 447 iovecs, not intsert.
[  156.146070] bcache: cached_dev_cache_miss() inserting bio is too large: 512 iovecs, not intsert.
[  156.223795] bcache: cached_dev_cache_miss() inserting bio is too large: 277 iovecs, not intsert.
[  156.326145] bcache: cached_dev_cache_miss() inserting bio is too large: 342 iovecs, not intsert.
[  156.602906] bcache: cached_dev_cache_miss() inserting bio is too large: 290 iovecs, not intsert.
[  156.646365] bcache: cached_dev_cache_miss() inserting bio is too large: 341 iovecs, not intsert.
[  156.671285] bcache: cached_dev_cache_miss() inserting bio is too large: 501 iovecs, not intsert.
[  157.216087] bcache: cached_dev_cache_miss() inserting bio is too large: 258 iovecs, not intsert.
[  165.010961] bcache: cached_dev_cache_miss() inserting bio is too large: 413 iovecs, not intsert.
[  165.386483] bcache: cached_dev_cache_miss() inserting bio is too large: 260 iovecs, not intsert.

Thanks,
Marco