On 2/12/23 2:47?AM, Helge Deller wrote: > Hi all, > > We see io-uring failures on the parisc architecture with this testcase: > https://github.com/axboe/liburing/blob/master/examples/io_uring-test.c > > parisc is always big-endian 32-bit userspace, with either 32- or 64-bit kernel. > > On a 64-bit kernel (6.1.11): > deller@parisc:~$ ./io_uring-test test.file > ret=0, wanted 4096 > Submitted=4, completed=1, bytes=0 > -> failure > > strace shows: > io_uring_setup(4, {flags=0, sq_thread_cpu=0, sq_thread_idle=0, sq_entries=4, cq_entries=8, features=IORING_FEAT_SINGLE_MMAP|IORING_FEAT_NODROP|IORING_FEAT_SUBMIT_STABLE|IORING_FEAT_RW_CUR_POS|IORING_FEAT_CUR_PERSONALITY|IORING_FEAT_FAST_POLL|IORING_FEAT_POLL_32BITS|0x1f80, sq_off={head=0, tail=16, ring_mask=64, ring_entries=72, flags=84, dropped=80, array=224}, cq_off={head=32, tail=48, ring_mask=68, ring_entries=76, overflow=92, cqes=96, flags=0x58 /* IORING_CQ_??? */}}) = 3 > mmap2(NULL, 240, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 3, 0) = 0xf7522000 > mmap2(NULL, 256, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 3, 0x10000000) = 0xf6922000 > openat(AT_FDCWD, "libell0-dbgsym_0.56-2_hppa.deb", O_RDONLY|O_DIRECT) = 4 > statx(4, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=689308, ...}) = 0 > getrandom("\x5c\xcf\x38\x2d", 4, GRND_NONBLOCK) = 4 > brk(NULL) = 0x4ae000 > brk(0x4cf000) = 0x4cf000 > io_uring_enter(3, 4, 0, 0, NULL, 8) = 0 > > > Running the same testcase on a 32-bit kernel (6.1.11) works: > root@debian:~# ./io_uring-test test.file > Submitted=4, completed=4, bytes=16384 > -> ok. > > strace: > io_uring_setup(4, {flags=0, sq_thread_cpu=0, sq_thread_idle=0, sq_entries=4, cq_entries=8, features=IORING_FEAT_SINGLE_MMAP|IORING_FEAT_NODROP|IORING_FEAT_SUBMIT_STABLE|IORING_FEAT_RW_CUR_POS|IORING_FEAT_CUR_PERSONALITY|IORING_FEAT_FAST_POLL|IORING_FEAT_POLL_32BITS|0x1f80, sq_off={head=0, tail=16, ring_mask=64, ring_entries=72, flags=84, dropped=80, array=224}, cq_off={head=32, tail=48, ring_mask=68, ring_entries=76, overflow=92, cqes=96, flags=0x58 /* IORING_CQ_??? */}}) = 3 > mmap2(NULL, 240, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 3, 0) = 0xf6d4c000 > mmap2(NULL, 256, PROT_READ|PROT_WRITE, MAP_SHARED|MAP_POPULATE, 3, 0x10000000) = 0xf694c000 > openat(AT_FDCWD, "trace.dat", O_RDONLY|O_DIRECT) = 4 > statx(4, "", AT_STATX_SYNC_AS_STAT|AT_NO_AUTOMOUNT|AT_EMPTY_PATH, STATX_BASIC_STATS, {stx_mask=STATX_BASIC_STATS|STATX_MNT_ID, stx_attributes=0, stx_mode=S_IFREG|0644, stx_size=1855488, ...}) = 0 > getrandom("\xb2\x3f\x0c\x65", 4, GRND_NONBLOCK) = 4 > brk(NULL) = 0x15000 > brk(0x36000) = 0x36000 > io_uring_enter(3, 4, 0, 0, NULL, 8) = 4 > > I'm happy to test any patch if someone has an idea.... No idea what this could be, to be honest. I tried your qemu vm image, and it does boot, but it's missing keys to be able to update apt and install packages... After fiddling with this for 30 min I gave up, any chance you can update the sid image? Given how slow this thing is running, it'd take me all day to do a fresh install and I have to admit I'm not THAT motivated about parisc to do that :) -- Jens Axboe
