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Date:   Mon, 15 Jun 2020 00:40:38 +0000
Subject: [Bug 208173] BUG: using smp_processor_id() in preemptible, caller is

--- Comment #3 from Tom Seewald ( ---
After looking around, syzkaller already found this bug [1], and a fix was
already posted [2] but Linus didn't pull it before tagging the rc1 release.

I manually applied commit 811985365378df01386c3cfb7ff716e74ca376d5 ("ext4:
mballoc: Use this_cpu_read instead of this_cpu_ptr") from, and I can
confirm that this fixes the problem. Hopefully this makes it in by rc2.

I'll close this report once Linus pulls the fix.


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