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I don't know that it's > definitely your bug as I had a process stuck in the D state, but I don't > believe it was doing anything that modified maple trees at the time, just > waiting for PG_writeback on a folio. Anyway, I was running the generic/1= 30 > xfstest and pressed ctrl-C and got a bunch of oopses (see attached). >=20 > Unfortunately, I can't do anything to try and get more information as any= thing > that tries to clone() gets another oops. >=20 > The RIP is mas_alloc_nodes+0x55/0x16e: >=20 > mas_set_alloc_req(mas, 0); > if (mas->mas_flags & MA_STATE_PREALLOC) { > if (allocated) > return; > BUG_ON(!allocated); <------- 1237 > WARN_ON(!allocated); > } >=20 > The base kernel is at commit bf3a69c6861f plus some of my patches, none o= f > which alter the maple-tree code or MM code. >=20 How can we be stuck in D state on a BUG_ON()? If this is a maple tree bug, then it's in the calculations done for preallocation. The last time that changed was in December in commit 4249f13c11be8b8b7bf93204185e150c3bdc968d. Could you try reverting this change? >From the trace, this is failing on loading a binary. Could you please try changing BUG_ON() to MAS_BUG_ON(mas, !allocated) to get more information? I ran generic/130 here and it worked in my testing. Does this happen without your patches? Maybe the changes you make are causing something to happen more frequently? Thanks, Liam