On Tue, Oct 12, 2021 at 11:55:50AM +0200, Rasmus Villemoes wrote: > ...default_flag_spec has '.flags = SPECIAL | SMALL,', i.e. what one > would get from %#x . I'm guessing that's what upsets 0-day. > > Geez it would be nice if 0day actually reported the "Expected foo, but > bar was emitted to the buffer". It's there; you just have to dive into the dmesg.xz to get it: [ 48.607787][ T1214] test_printf: vsnprintf(buf, 256, "%pGp", ...) returned 33, expected 29 [ 48.616106][ T1214] test_printf: vsnprintf(buf, 18, "%pGp", ...) returned 33, expected 29 [ 48.624292][ T1214] test_printf: vsnprintf(buf, 0, "%pGp", ...) returned 33, expected 29 [ 48.632403][ T1214] test_printf: kvasprintf(..., "%pGp", ...) returned '0x0(node=0|zone=0|lastcpupid=0x0)', expected 'node=0|zone=0|lastcpupid=0x0)' [ 48.645741][ T1214] test_printf: vsnprintf(buf, 256, "%pGp", ...) returned 33, expected 29 [ 48.654023][ T1214] test_printf: vsnprintf(buf, 23, "%pGp", ...) returned 33, expected 29 [ 48.662218][ T1214] test_printf: vsnprintf(buf, 0, "%pGp", ...) returned 33, expected 29 [ 48.670327][ T1214] test_printf: kvasprintf(..., "%pGp", ...) returned '0x0(node=0|zone=0|lastcpupid=0x0)', expected 'node=0|zone=0|lastcpupid=0x0)' [ 48.683670][ T1214] test_printf: vsnprintf(buf, 256, "%pGp", ...) returned 88, expected 71 [ 48.691937][ T1214] test_printf: vsnprintf(buf, 64, "%pGp", ...) returned 88, expected 71 [ 48.700128][ T1214] test_printf: vsnprintf(buf, 0, "%pGp", ...) returned 88, expected 71 [ 48.708249][ T1214] test_printf: kvasprintf(..., "%pGp", ...) returned '0x4fffffc008003c(uptodate|dirty|lru|active|swapbacked|node=1|zone=1|lastcpupid=0x1fffff)', expected 'uptodate|dirty|lru|active|swapbacked|node=1|zone=1|lastcpupid=0x1fffff)' [ 48.730275][ T1214] test_printf: failed 12 out of 420 tests So you're right, it's missing the 0x, but I still don't know how to run this self-test.
