On Wed, May 04, 2022 at 11:42:27AM +0200, Jason A. Donenfeld wrote: > So more likely is that this patch just helps unmask a real issue > elsewhere -- linker, compiler, or register restoration after preemption. > I don't think there's anything to do with regards to the patch of this > thread, as it's clearly fine. The problem even goes away if I just add a nop... diff --git a/lib/hexdump.c b/lib/hexdump.c index 06833d404398..ace74f9b3d5a 100644 --- a/lib/hexdump.c +++ b/lib/hexdump.c @@ -46,6 +46,7 @@ EXPORT_SYMBOL(hex_asc_upper); int hex_to_bin(unsigned char ch) { unsigned char cu = ch & 0xdf; + __asm__("l.nop 0"); return -1 + ((ch - '0' + 1) & (unsigned)((ch - '9' - 1) & ('0' - 1 - ch)) >> 8) + ((cu - 'A' + 11) & (unsigned)((cu - 'F' - 1) & ('A' - 1 - cu)) >> 8);