[alsa-devel] sound: another WARNING in rawmidi_transmit_ack

1 Feb 2016


      Hello,
The following program triggers a splash of WARNINGs in rawmidi_transmit_ack.
Takashi, I am on commit 36f90b0a2ddd60823fe193a85e60ff1906c2a9b3 + a
bunch of your recent fixes:
https://gist.githubusercontent.com/dvyukov/40640128a433ad16a56a/raw/ab3a0863...
------------[ cut here ]------------
WARNING: CPU: 2 PID: 6954 at sound/core/rawmidi.c:1133
rawmidi_transmit_ack+0x24a/0x3b0()
Modules linked in:
CPU: 2 PID: 6954 Comm: syz-executor Not tainted 4.5.0-rc2+ #306
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
 00000000ffffffff ffff8800309d78b8 ffffffff82be2c0d 0000000000000000
 ffff880031238000 ffffffff8719a820 ffff8800309d78f8 ffffffff81355139
 ffffffff8527e69a ffffffff8719a820 000000000000046d 0000000000000005
Call Trace:
 [<     inline     >] __dump_stack lib/dump_stack.c:15
 [<ffffffff82be2c0d>] dump_stack+0x6f/0xa2 lib/dump_stack.c:50
 [<ffffffff81355139>] warn_slowpath_common+0xd9/0x140 kernel/panic.c:482
 [<ffffffff81355369>] warn_slowpath_null+0x29/0x30 kernel/panic.c:515
 [<ffffffff8527e69a>] rawmidi_transmit_ack+0x24a/0x3b0 sound/core/rawmidi.c:1133
 [<ffffffff8527e851>] snd_rawmidi_transmit_ack+0x51/0x80
sound/core/rawmidi.c:1163
 [<ffffffff852d9046>] snd_virmidi_output_trigger+0x2b6/0x570
sound/core/seq/seq_virmidi.c:185
 [<     inline     >] snd_rawmidi_output_trigger sound/core/rawmidi.c:150
 [<ffffffff85285a0b>] snd_rawmidi_kernel_write1+0x4bb/0x760
sound/core/rawmidi.c:1252
 [<ffffffff85287b73>] snd_rawmidi_write+0x543/0xb30 sound/core/rawmidi.c:1302
 [<ffffffff817ba5f3>] __vfs_write+0x113/0x480 fs/read_write.c:528
 [<ffffffff817bc087>] vfs_write+0x167/0x4a0 fs/read_write.c:577
 [<     inline     >] SYSC_write fs/read_write.c:624
 [<ffffffff817bf371>] SyS_write+0x111/0x220 fs/read_write.c:616
 [<ffffffff86660276>] entry_SYSCALL_64_fastpath+0x16/0x7a
arch/x86/entry/entry_64.S:185
---[ end trace 6f686d9dad133d99 ]---
// autogenerated by syzkaller (http://github.com/google/syzkaller)
#include <pthread.h>
#include <stdint.h>
#include <string.h>
#include <sys/syscall.h>
#include <unistd.h>
long r[28];
void* thr(void* arg)
{
  switch ((long)arg) {
  case 0:
    r[0] = syscall(SYS_mmap, 0x20000000ul, 0xd90000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 1:
    memcpy(
        (void*)0x20d8f000,
        "\x2f\x64\x65\x76\x2f\x73\x65\x71\x75\x65\x6e\x63\x65\x72\x32",
        15);
    r[2] = syscall(SYS_open, "/dev/sequencer2", 0x181800ul, 0,
                   0, 0);
    break;
  case 2:
    memcpy((void*)0x20d8df5b, "\x2f\x64\x65\x76\x2f\x73\x6e\x64\x2f\x6d"
                              "\x69\x64\x69\x43\x23\x44\x23",
           17);
    r[4] = syscall(SYS_open, "/dev/snd/midiC2D0", 0x802ul, 0, 0,
                   0);
    break;
  case 3:
    r[5] = syscall(SYS_mmap, 0x20d90000ul, 0x1000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 4:
    r[6] = syscall(SYS_mmap, 0x20d90000ul, 0x1000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 5:
    r[7] = syscall(SYS_mmap, 0x20000000ul, 0x0ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 6:
    r[8] = syscall(SYS_mmap, 0x20d91000ul, 0x1000ul, 0x3ul, 0x32ul,
                   0xfffffffffffffffful, 0x0ul);
    break;
  case 7:
    *(uint32_t*)0x20d91000 = (uint32_t)0xf834;
    r[10] =
        syscall(SYS_ioctl, r[2], 0x40045201ul, 0x20d91000ul, 0, 0, 0);
    break;
  case 8:
    r[11] = syscall(SYS_mmap, 0x20d91000ul, 0x1000ul, 0x3ul, 0x32ul,
                    0xfffffffffffffffful, 0x0ul);
    break;
  case 9:
    r[12] =
        syscall(SYS_ioctl, r[2], 0x80404509ul, 0x20d91000ul, 0, 0, 0);
    break;
  case 10:
    r[13] = syscall(SYS_mmap, 0x20d90000ul, 0x1000ul, 0x3ul, 0x32ul,
                    0xfffffffffffffffful, 0x0ul);
    break;
  case 11:
    *(uint64_t*)0x20d90ffd = (uint64_t)0x20a962b0;
    *(uint64_t*)0x20d91005 = (uint64_t)0xd3;
    *(uint64_t*)0x20d9100d = (uint64_t)0x20d902e4;
    *(uint64_t*)0x20d91015 = (uint64_t)0xf6;
    *(uint64_t*)0x20d9101d = (uint64_t)0x20d907cd;
    *(uint64_t*)0x20d91025 = (uint64_t)0x67;
    *(uint64_t*)0x20d9102d = (uint64_t)0x20000000;
    *(uint64_t*)0x20d91035 = (uint64_t)0x0;
    memcpy((void*)0x20a962b0,
           "\xea\x7e\xf1\x21\xe0\xc7\xaa\xa3\x6d\x6c\xb3\x94\x27\x70"
           "\xed\x74\xab\xee\x27\x7c\x1b\x9e\x66\x76\x79\xa6\x4f\x69"
           "\xf6\x63\x0a\x5c\x31\xe3\xef\x43\x43\x93\x6a\x40\x53\x03"
           "\x0d\x61\xd9\xb5\xac\xc0\xe9\x10\x1c\x5d\x50\x6e\x7f\xe1"
           "\x0a\x65\x7e\x09\xa5\x57\x89\x33\x52\x49\x01\xaf\x5f\xdd"
           "\x55\xb2\x59\xca\xf6\x0d\x39\x26\xa6\xad\x9f\x93\x7e\xda"
           "\x06\x6f\xae\x4e\xce\x3d\xd9\xbd\x4f\x6a\xec\x7b\xb7\xc8"
           "\xe0\xd8\x25\x85\xca\xda\x7f\x04\x7a\x0e\x23\x66\x63\xc0"
           "\xfb\x9a\xe7\x87\xb2\x85\x83\x6e\x07\xd5\x8c\x8e\xb1\x8a"
           "\x9a\x43\xb8\x5c\x2d\xe4\xe9\x9b\x8d\xfb\x23\x52\xfd\xf9"
           "\x7e\xa4\xc1\x8b\x90\xf9\x14\x98\xba\x75\xa5\xf2\x88\xbf"
           "\x8f\x28\x8f\xee\xf3\xc7\x20\xfc\xa3\x53\xd2\x1c\x1b\x02"
           "\xc5\x2b\x1b\x9a\x17\xb6\xef\xd5\x6b\x46\x4c\x66\x75\x45"
           "\xcc\xb4\x1d\x41\x13\xb1\x1f\xc7\x76\x7f\x28\x8b\x3d\x85"
           "\x16\x38\x2f\x27\xdb\x17\x71\x05\xd6\x0e\x5e\x53\x3b\x19"
           "\xbb",
           211);
    memcpy((void*)0x20d902e4,
           "\xe8\x61\x5b\xd6\x03\xc7\x69\x3a\xa4\x17\x85\xce\xf4\x49"
           "\x07\x42\xee\x24\x4a\x9e\xe5\xff\x3e\xa1\xbc\x97\xc7\x66"
           "\x01\x9f\x34\x57\x1b\xf6\x99\x2b\xd0\x45\xa0\xc9\x2b\x2d"
           "\x45\x45\x7a\xb0\xf9\x9d\xc8\x3b\x53\x78\x3a\x93\x42\xcc"
           "\x88\xa9\xf4\x79\xab\x1c\xfe\x48\x8d\x61\x6a\x84\x26\x2d"
           "\x74\xb6\x2d\xa7\xbb\x8c\x33\x6e\xca\x38\x57\xf8\x39\x91"
           "\xc7\x57\x6f\x28\xbc\x2e\x9e\xca\xc8\xcb\x08\x0c\x1e\xe6"
           "\x49\x5d\x32\xe6\x33\xd0\x92\x20\xb5\x7f\x96\x2a\x47\x3f"
           "\xa5\x9d\x9b\xeb\x67\xd9\x36\x48\xeb\x0d\x16\xd4\xc9\x48"
           "\x7d\xa4\xfd\x42\xde\x2d\xf6\xae\x48\xe6\x50\x1c\x24\x86"
           "\xe5\x0d\x23\x04\xa6\xcc\xfb\x98\xbe\x61\xb2\xed\x59\x28"
           "\x82\xd1\x80\x06\xf1\x90\xae\xd4\x99\x28\x92\x92\x30\xdc"
           "\x12\x29\x5e\x47\x69\x74\x7b\x1b\x82\x14\xce\xaa\x35\x06"
           "\xa3\x24\x00\x34\xf8\xeb\x3f\x24\xf7\xdf\x30\x59\xb5\x54"
           "\x1a\x60\xfa\x23\x1b\x67\xf8\x3c\x59\x56\x0b\xef\xaf\x09"
           "\x7d\xaa\xe5\x4b\xce\x0b\x6a\x3b\xde\x94\xa1\x80\x37\xae"
           "\x5c\x8c\xac\x0f\x1a\xfd\x36\x9a\xa8\x8a\xd2\x2d\xe5\xf1"
           "\xb2\x8e\x29\x30\xe1\x39\x72\xef",
           246);
    memcpy((void*)0x20d907cd,
           "\x3e\x14\x32\x60\x81\x87\xfb\x49\xb5\x66\xa3\x99\xe5\x9b"
           "\xfd\xae\xec\xa8\x66\x6b\x6b\x52\xa4\x13\xbd\x8a\x2a\xe7"
           "\x26\x6a\x48\x8d\x09\x1f\x6e\x60\x25\x75\xd0\x62\xfa\x32"
           "\xc0\x40\x16\x21\xc0\x41\xa9\xd3\x30\x77\x64\x5d\xf4\x50"
           "\xfd\x63\x06\xbf\xc2\xad\xfa\xf6\xa5\x2a\x51\x60\x5b\x47"
           "\x60\x4d\xbe\x25\x16\x2e\xd7\xdc\x43\xe3\xc9\x57\x4a\x00"
           "\x9f\x4f\x23\x40\xb0\x9b\xc7\x25\x5f\xef\xb1\x97\x9e\xb3"
           "\x09\xc8\x99\x34\xf2",
           103);
    r[25] = syscall(SYS_writev, r[4], 0x20d90ffdul, 0x4ul, 0, 0, 0);
    break;
  case 12:
    memcpy(
        (void*)0x20d8a029,
        "\x41\x30\x85\x16\x79\x50\x97\xdd\x70\xc7\x66\xcd\x0b\xa5\x9e"
        "\x92\xe8\xba\x6c\x3f\x30\x00\x24\x10\x48\xa9\x47\xe4\x96\x91"
        "\x7d\x4b\x68\x92\xe9\x81\x54\xd5\xe8\x72\xdf\x42\x12\xa3\xfd"
        "\xe7\x30\xa0\xd7\x9f\xd0\x88\xeb\x6b\x42\x43\x78\x80\xfb\x51"
        "\x39\xcd\xab\x77\x9a\xb4\x9a\x79\xa4\x0b\xa0\x3a\x9e\x09\x0d"
        "\x1d\xda\x32\x68\x64\xf9\x03\x3f\xed\x07\xd2\xd3\xea\x82\xb8"
        "\x8e\x47\xf9\x7a\x78\x73\x6f\x46\x9a\x6e\xb3\xa8\xb7\x9f\xac"
        "\x1c\x47\x66\x0a\x67\x59\xb4\x6b\x52\xab\x3b\xe6\x6d\x74\xe2"
        "\xf0\x84\xfe\x1b\x3a\xe8\x82\x2b\x2a\xad\x3e\x61\x69\xdb\xe0"
        "\xff\x65\xa9\xab\xf9\xa1\x69\x30\xcd\xc2\xbb\x2e\xac\x11\xf6"
        "\x3c\x31\x25\x2e\x77\x12\x86\xdf\x24\x37\xf8\xdc\x9a\xc3\x11"
        "\xd4\x25\xce\x12\xbe\x2f\xb0\x4a\x50\x64\x8a\xf1\xb3\xf0\x75"
        "\xae\x5a\x0b\x5d\xf3\x8d\xe8\x75\x07\xaa\x0a\x93\x6c\x85\x2c"
        "\x48\x3e\xae\xbc\xe1\x49\xab\xa9\x7b\xe3\x57\x7e\xa8\x90\x1a"
        "\x04\x5f\x10\x9a\x96\x5b\xf4\xd0\xa1\xec\xed\x0f\xd8\x0a\x40"
        "\xd8\x75\x05\x0d\x14\xc6\x28\xbb\x7a\xc5\x42\x69\xb0\xea\x26"
        "\x0d\x2f\xb6\xba\xcc\x23\x28\x28\x61\x6b\x55\xf8\x10\xb8\xb8"
        "\x2d\xba\x9f\xfd\x2e\x1d\xa7\xf1\x3f\x8e\x54\x64\xf5\x6f\xfe"
        "\x33\x93\x1d\xcb\x82\x60\x8f\x90\x85\xf7\x58\xc2\x3b\x9d\x9a"
        "\x7f\xe0\x55\x2e\xa2\x1a\xd5\x39\xe6\xfd\xcf\x2c\x2c\x5b\x7e"
        "\xfb\xfd\x81\x17\x92\x95\x97\x40\x74\x9d\xfb\x81\xc2\x02\x85"
        "\x0c\x55\xed\xbf\x1f\xce\xad\x58\x88\xd2\x10\xf0\x4e\x18\x28"
        "\x86\xe0\x1c\xa7\xce\x7c\xdb\xdd\x15\x3c\xd2\xd8\x1d\x9e\x43"
        "\x18\x0e\x1d\xc2\xb8\x8e\xf0\x0f\xd6\x6b\x89\x40\x00\x28\x1d"
        "\x5a\xa2\x5a\xeb\x2f\x60\x7b\x02\xc9\x86\x88\xfb\x94\x89\x81"
        "\xec\x4c\x9f\xe8\xaf\xcb\x7b\x68\x21\xe1\xa3\x60\x32\x7d\x23"
        "\xcf\x71\x20\x22\x1b\x8e\xec\x51\x17\x05\x70\x2c\x92\x70\x59"
        "\x35\x6a\x25\x71\x39\x2c\x66\x42\x3f\x46\x78\x88\x7f\xdb\x71"
        "\xb8\xd6\x7c\xce\x8b\x4a\xb1\x8d\xa2\xc5\xb9\xac\xe7\x89\x4b"
        "\x7a\x6c\x91\x11\x6d\xe9\x2b\x27\x80\x49\x32\x66\x16\xed\xf1"
        "\x74\x51\xcd\x44\x4a\x94\x5c\xfc\xe5\x11\x54\xf5\x61\xbe\xed"
        "\xbc\x00\xbd\xde\x02\xd4\x40\xa5\x13\x4f\x48\x6e\x43\x1a\xc2"
        "\x56\xe8\x95\x16\xcc\x5f\x4d\xf8\x80\x40\x2c\x59\x07\x32\x49"
        "\x84\xff\x31\x53\xd9\x26\x08\xc1\x06\xf2\x69\x4b\x35\xa4\x41"
        "\xe5\x00\xdd\x64\x23\x1a\xb7\x29\xde\xef\x90\x03\xe3\xe1\x7d"
        "\x61\x74\xfd\xe5\xd1\xa6\xa8\x9b\xc5\x07\x90\xfb\x75\x5e\x64"
        "\xa3\x22\xcc\xd2\xc9\x29\xdb\x71\x84\x5c\x67\x51\x75\xc6\xdc"
        "\x22\x78\xb8\x6d\x2e\x8f\xf5\x51\x87\x53\xd5\xc5\x10\x53\xc3"
        "\x0c\x96\xf0\x6c\xca\x61\x37\xfc\x63\xff\xe0\xd4\x77\x3d\xea"
        "\x64\xe0\x43\xfb\xca\xf6\xd0\x2d\xd2\xc4\x67\x35\x58\x70\xa5"
        "\x6f\x0c\x19\x93\x45\xdd\xf4\x0f\xad\x60\xf4\x8e\x8d\x6a\xb6"
        "\x8d\x66\xaa\xe6\x19\xc3\x60\x4a\x77\xaa\x7b\x15\x9b\x89\x65"
        "\x11\x70\xc6\xa1\x86\xf1\x7c\xac\xac\xe4\x94\xb3\x08\xdd\xd0"
        "\x7c\xfb\x60\x2f\x5f\x42\xe6\x97\xfc\x1c\x40\xc1\xb1\x2c\x4b"
        "\x9d\xc0\x66\x48\xf1\x1b\x74\x54\x5b\x97\xc8\xb1\xba\x0b\xa5"
        "\x36\x7b\xf9\x70\x09\x2e\x7e\x57\x07\x98\xaa\xa4\x40\x7b\xc7"
        "\x6c\xe3\x43\x8b\xc0\xff\x87\x1a\x91\xaa\x07\x1a\x39\x29\xf2"
        "\x81\xf8\xfe\x22\x77\x31\xbe\x89\x30\x91\x31\xe8\xa2\xe6\xd1"
        "\x68\x99\x2d\x5a\xbf\x42\x26\x3b\x19\x5a\x18\x20\xf9\xd6\x21"
        "\x8b\x6c\x2b\x1d\x6a\x99\xbe\x02\x39\xe9\x50\x0c\xf1\xb2\x9f"
        "\x10\xdd\x7d\x85\x95\xa7\x0d\x08\x90\x73\x26\xf8\x52\xb3\x39"
        "\x2c\x6a\x42\x60\x99\xf5\x65\xae\x4b\xd6\xd3\xc5\x21\x19\x96"
        "\x85\x08\xcb\xd6\xb3\xce\xda\xd1\x75\xc3\x86\xd2\x7c\x79\x78"
        "\xea\x8b\x88\xf4\xe1\x82\x12\x1a\xe4\x57\x57\xa6\x51\x3c\xa4"
        "\xf0\x42\xbb\x21\xca\x5d\xec\xcd\x89\xec\x0c\x1b\xb8\x5b\x21"
        "\x17\xb3\xca\x32\x50\xc3\xad\x06\x05\xfa\x5e\x9c\x19\xfe\x81"
        "\x8a\x18\x06\x76\x46\xda\x93\xd7\x90\xee\xb7\x30\x23\x09\xfd"
        "\xd9\xa8\x40\x5c\xf0\xfc\xb3\xf7\xb1\x6f\x2b\x01\xe1\x0f\x27"
        "\x98\xff\xf9\xd4\x01\x89\x91\x79\x71\x11\xdb\x30\xc0\x83\x1e"
        "\x12\x62\x0e\x50\xa1\x47\x80\x99\xa4\xb6\x78\x19\xc5\x50\x4f"
        "\x82\x87\x35\x3e\x9c\x22\x20\x81\xef\xfe\xc3\x3e\x79\x2c\xf4"
        "\x7c\x7a\xcc\xfd\xbd\x63\xb4\x6b\x98\xd3\x56\x1c\xeb\xed\x1a"
        "\x3a\xff\x5c\x8e\x0e\x7e\x70\x78\xfc\x91\xfc\x29\x14\xa3\x8e"
        "\xcf\x47\x78\x0f\x98\x97\xb4\x21\x3d\x9c\x19\xbf\x27\x9b\xb4"
        "\x16\xe6\x50\xad\xe4\x6b\xa9\x1b\xa1\xe2\x05\xc1\x0a\x83\x1d"
        "\x03\xaf\x7b\x7d\x8c\x88\xa3\x11\x7e\x5d\x72\xe0\x5d\xad\x50"
        "\xc4\xc8\x75\xc8\xcc\xaa\x7d\x8f\xb4\x47\x5e\x34\xe8\x04\x71"
        "\x10\xdb\x92\xb7\xfe\x9b\x77\x9f\x04\xe3\x74\x72\x16\xb7\x4e"
        "\x31\xf8\x00\x98\x5c\x59\xf7\x4d\x7d\x89\xd7\x1c\xbd\xd7\x85"
        "\xf5\x79\xf3\xd8\x51\xcb\xab\x14\x61\xf6\xc0\xb9\xc0\xff\xec"
        "\xa2\x62\xc9\xec\x1e\xb9\xc8\x28\x20\xa8\x15\xc0\x57\xe2\xce"
        "\x62\x8a\xcc\xe0\xec\x47\xe2\x9e\x82\xcf\xf8\xe7\x2b\x98\x4c"
        "\x64\x8c\xec\x5e\x85\xd5\xe3\x21\x46\x82\xe4\x56\x4b\x59\x13"
        "\x39\x9c\x4e\x70\xbb\xfc\x7b\xd4\xc2\xdf\x5a\xde\x21\x67\x5d"
        "\x1f\xf0\xea\xd6\x4d\xaa\xb7\x2c\xdb\x70\x3c\xb4\x08\x6e\x59"
        "\x02\xf8\x8d\xdc\xac\x21\xda\x51\x70\xb1\xdd\x83\x16\xd3\x9c"
        "\xa6\x17\xb8\x93\x74\x57\x38\xa4\xab\x5e\x4b\x3a\x3b\xb6\xa1"
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        "\x96\x69\xfd\x5b\x29\x31\xfc\x35\x44\x5d\x2f\xeb\x87\x56\x9f"
        "\x88\xfe\xbf\x6d\xa2\x6e\xdf\x2f\xc4\x6e\x17\xdc\xfa\x8b\xa4"
        "\x26\x55\x01\xda\xfa\x81\x64\xba\x00\x5c\x83\xb2\x9e\x07\x54"
        "\x9e\x40\x91\xf6\xcb\x57\xbc\x68\x72\xa7\x63\x22\x36\x57\x5b"
        "\x93\x6f\x03\xd3\x90\x81\xc3\x10\x69\x25\xe4\x17\x16\xe1\x00"
        "\xf3\xba\x14\x98\x4a\x73\xc9\xe6\xd2\xfc\x1c\xc3\x68\xee\x8b"
        "\x7d\xec\x88\x2e\xf3\x2e\x25\x75\x6f\xf9\x7d\xd1\xde\xa8\xb4"
        "\x09\xab\xda\x68\xf7\x7a\x45\x79\xba\xe7\xe9\xad\x45\x77\x33"
        "\xcf\xe2\x8a\xca\x83\xa8\x2f\x75\xee\x52\xa5\x1f\xce\x4e\x75"
        "\xdd\x96\x84\x4f\xd2\xa5\x19\xeb\x5f\xb0\xbb\xf7\xf7\x57\x8d"
        "\x63\xd2\x92\x1a\x6b\xa1\x7f\x5e\x3d\x80\x8f\x8b\x7d\x94\x76"
        "\x9d\x52\xcd\x87\x76\x58\xdc\x7e\x9f\xde\x7d\x9a\x80\x8b\xaf"
        "\x22\xaf\xb8\x37\x88\xf7\x63\x88\x2c\xaa\xd2\x8a\xfc\x85\xb8"
        "\x42\xe3\xad\x20\x29\xdc\x9f\xd6\x93\x38\x4a\xc4\x1d\xd5\x49"
        "\xfb\x71\xaa\x25\x5a\x07\xcb\x3b\x0f\xd8\x84\xa9\x48\xe8\x0e"
        "\xff\x4d\xe5\x7b\x00\x0d\x19\x47\x94\x3b\xb4\xc6\x60\xed\x83"
        "\x38\x55\x56\x04\x0c\xec\x08\x2d\x2f\x19\x90\xee\xac\x35\x68"
        "\xe3\x2c\x9b\x91\x99\x0c\xec\x6b\x83\x70\x3d\xd8\x92\x8d\x74"
        "\x34\xfa\xf1\x09\x18\xce\x03\xe0\x89\xb6\x3c\x41\xac\x1a\x02"
        "\x5c\x02\xc1\x0a\x48\x7b\xa1\x47\x19\xba\xd1\x57\x4d\xca\x7e"
        "\x08\xf6\xea\xa5\x55\x9d\x91\xfb\xdb\x06\xc0\x77\xd4\xdd\xc2"
        "\x3a\xfa\x7e\x31\xe7\xac\x25\x1d\xa2\x53\x1c\x79\xbe\xb1\xb7"
        "\x21\x77\xee\xd3\xb1\x8b\xf9\xe2\x78\x69\x63\x31\xe9\x28\xb8"
        "\x1c\x4b\xe1\x98\x41\x3c\x02\x42\x2a\x98\x5d\xbd\x75\x9d\x61"
        "\xf6\xd8\xf2\x59\xf4\x54\x34\x1b\xb0\x80\x93\xa9\x52\xe6\x59"
        "\xe9\x2f\xe3\xbd\x37\x75\x6d\xe4\xab\x99\x6b\xbc\xf1\x64\xda"
        "\xdf\x14\xe7\x22\x1c\x20\xe7\xf7\x12\x0d\xeb\xbd\x77\x5e\x46"
        "\x2c\xb9\x08\xc4\x84\xe2\x2c\xc9\xa7\xe4\x7f\xab\x84\xd9\xbb"
        "\x39\xbf\xe7\x5b\xed\xeb\x75\x7d\x67\xa5\xc3\x3d\x8d\xd3\x77"
        "\x52\x68\x1c\x20\x29\x66\xeb\x2f\xd5\xc7\x66\x60\x59\xfb\x85"
        "\x19\xb5\x5a\x24\xbd\x99\xf9\x8e\x00\xd4\xd7\xc2\x21\x0f\x59"
        "\xe8\xd2\x26\x92\x2c\x7b\x38\x95\x10\xe8\x02\x66\xee\x16\x1f"
        "\x4a\xc4\x58\x72\x0b\x1f\x86\xd4\xee\x09\x3c\x4b\x4e\x74\xbc"
        "\x97\x6f\x52\x12\xc1\xc7\xae\x3a\x8a\x54\x52\xe6\xc7\x7c\xb9"
        "\x05\x65\xcc\x5f\x71\x07\xa3\x35\xd4\x35\xf2\x05\xf8\x0c\x27"
        "\x02\xfb\x93\x10\xe6\xbe\xcc\xc2\xcf\x5d\x71\x77\x86\x03\x6c"
        "\xa3\xbd\x6a\x06\xd4\x4c\xb0\xf5\xc8\xb8\xc7\x11\x2a\xda\x99"
        "\xb6\xf7\x68\x39\xf3\x2c\x2f\x45\xed\xaa\x24\x56\x46\xfe\x05"
        "\x8b\x9f\x93\x6a\xc7\x8e\x0b\x9f\xb3\xe9\x45\xee\x59\xcd\x69"
        "\xf1\x5a\xe9\x14\x22\x66\xa0\x3f\x00\x27\x87\x6d\x67\x68\x79"
        "\x54\xb8\x7f\xd2\x63\xb4\x3f\x48\xf5\xf6\x3e\xa1\x9b\x60\x66"
        "\x2d\x85\xe7\x08\xd3\x37\x37\xca\x3b\xc1\xb0\xcd\x07\x3d\xec"
        "\x39\x0b\x79\xd3\xd2\x7d\xfe\x1b\xaa\x35\xf6\xab\x01\xf7\x64"
        "\x52\x42\xdd\x9c\xce\xea\x12\xd5\xb6\xfe\xda\x76\xf0\x28\x24"
        "\x64\x61\xb2\x8b\x52",
        4100);
    r[27] = syscall(SYS_write, r[4], 0x20d8a029ul, 0x1004ul, 0, 0, 0);
    break;
  }
  return 0;
}
int main()
{
  long i;
  pthread_t th[13];
memset(r, -1, sizeof(r));
  for (i = 0; i < 13; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    usleep(10000);
  }
  for (i = 0; i < 13; i++) {
    pthread_create(&th[i], 0, thr, (void*)i);
    if (i % 2 == 0)
      usleep(10000);
  }
  usleep(100000);
  return 0;
}

[alsa-devel] sound: another WARNING in rawmidi_transmit_ack

Dmitry Vyukov