[BRLTTY] Brltty 'invalid character' spam in logs; maybe hardware issue?
Nathaniel W Griswold
nate at manicmind.earth
Thu May 6 22:20:36 EDT 2021
Hello,
I recently started getting some spam in my logs (like a lot, 1MB/sec of text). The errors all look the same and count up sequentially:
brltty[733]: brltty: invalid character U+0000 on screen at [96,65]
brltty[733]: brltty: invalid character U+0000 on screen at [97,65]
…
May 6 20:47:04 nano brltty[733]: brltty: invalid character U+0000 on screen at [127,65]
There are occasional lines that do not contain two ‘brltty’s, like so:
May 6 20:47:04 nano brltty[733]: invalid character U+0000 on screen at [212,64]
I don’t know if this is a software or hardware issue. I don’t want to just disable brltty as i think it could be an issue with my machine. Does anyone have any tips for diagnosing the problem?
Attached below is the output of `lsof -p <brltty-pid>`
Thanks!
Nate
——
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
brltty 733 root cwd DIR 254,0 4096 12064540 /var/lib/brltty
brltty 733 root rtd DIR 254,0 4096 2 /
brltty 733 root txt REG 254,0 896928 15728947 /usr/bin/brltty
brltty 733 root mem REG 254,0 38952 15729903 /usr/lib/brltty/libbrlttyxlx.so
brltty 733 root mem REG 254,0 51696 15731829 /usr/lib/x86_64-linux-gnu/libnss_files-2.31.so
brltty 733 root mem REG 254,0 3041456 15729174 /usr/lib/locale/locale-archive
brltty 733 root mem REG 254,0 617128 15728938 /usr/lib/x86_64-linux-gnu/libpcre2-8.so.0.10.1
brltty 733 root mem REG 254,0 330720 15729397 /usr/lib/x86_64-linux-gnu/libblkid.so.1.1.0
brltty 733 root mem REG 254,0 149576 15728668 /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.29.0
brltty 733 root mem REG 254,0 100736 15729046 /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
brltty 733 root mem REG 254,0 1870824 15729558 /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.28
brltty 733 root mem REG 254,0 28407344 15731765 /usr/lib/x86_64-linux-gnu/libicudata.so.67.1
brltty 733 root mem REG 254,0 464848 15730489 /usr/lib/x86_64-linux-gnu/libpcre.so.3.13.3
brltty 733 root mem REG 254,0 43496 15729889 /usr/lib/x86_64-linux-gnu/libffi.so.7.1.0
brltty 733 root mem REG 254,0 93000 15731833 /usr/lib/x86_64-linux-gnu/libresolv-2.31.so
brltty 733 root mem REG 254,0 166120 15729057 /usr/lib/x86_64-linux-gnu/libselinux.so.1
brltty 733 root mem REG 254,0 387712 15730040 /usr/lib/x86_64-linux-gnu/libmount.so.1.1.0
brltty 733 root mem REG 254,0 113088 15729771 /usr/lib/x86_64-linux-gnu/libz.so.1.2.11
brltty 733 root mem REG 254,0 18480 15733574 /usr/lib/x86_64-linux-gnu/libgmodule-2.0.so.0.6600.8
brltty 733 root mem REG 254,0 1321344 15731823 /usr/lib/x86_64-linux-gnu/libm-2.31.so
brltty 733 root mem REG 254,0 1176248 15728758 /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.2.8
brltty 733 root mem REG 254,0 137568 15728976 /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
brltty 733 root mem REG 254,0 890800 15729584 /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
brltty 733 root mem REG 254,0 158400 15729142 /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
brltty 733 root mem REG 254,0 39912 15731834 /usr/lib/x86_64-linux-gnu/librt-2.31.so
brltty 733 root mem REG 254,0 1839792 15731821 /usr/lib/x86_64-linux-gnu/libc-2.31.so
brltty 733 root mem REG 254,0 149520 15731832 /usr/lib/x86_64-linux-gnu/libpthread-2.31.so
brltty 733 root mem REG 254,0 26552 15733217 /usr/lib/x86_64-linux-gnu/libgpm.so.2
brltty 733 root mem REG 254,0 38864 15734504 /usr/lib/x86_64-linux-gnu/libcap.so.2.44
brltty 733 root mem REG 254,0 18688 15731822 /usr/lib/x86_64-linux-gnu/libdl-2.31.so
brltty 733 root mem REG 254,0 193848 15733084 /usr/lib/x86_64-linux-gnu/libbluetooth.so.3.19.3
brltty 733 root mem REG 254,0 1988784 15731770 /usr/lib/x86_64-linux-gnu/libicuuc.so.67.1
brltty 733 root mem REG 254,0 1232336 15733571 /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.6600.8
brltty 733 root mem REG 254,0 362712 15733576 /usr/lib/x86_64-linux-gnu/libgobject-2.0.so.0.6600.8
brltty 733 root mem REG 254,0 1944816 15728833 /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0.6600.8
brltty 733 root mem REG 254,0 126904 15729709 /usr/lib/x86_64-linux-gnu/libpolkit-gobject-1.so.0.0.0
brltty 733 root mem REG 254,0 531112 15728945 /usr/lib/x86_64-linux-gnu/libpcre2-32.so.0.10.1
brltty 733 root mem REG 254,0 186496 15733940 /usr/lib/x86_64-linux-gnu/libexpat.so.1.6.12
brltty 733 root mem REG 254,0 179168 15734258 /usr/lib/x86_64-linux-gnu/liblouis.so.20.0.4
brltty 733 root mem REG 254,0 342168 15729120 /usr/lib/x86_64-linux-gnu/libdbus-1.so.3.19.13
brltty 733 root mem REG 254,0 1030440 15728663 /usr/lib/x86_64-linux-gnu/libasound.so.2.0.0
brltty 733 root mem REG 254,0 733976 15729003 /usr/lib/x86_64-linux-gnu/libsystemd.so.0.30.0
brltty 733 root mem REG 254,0 177928 15729029 /usr/lib/x86_64-linux-gnu/ld-2.31.so
brltty 733 root 0r CHR 1,3 0t0 4 /dev/null
brltty 733 root 1u unix 0xffff97a1a7020400 0t0 21727 type=STREAM
brltty 733 root 2u unix 0xffff97a1a7020400 0t0 21727 type=STREAM
brltty 733 root 3u unix 0xffff97a32c1f4000 0t0 20910 type=DGRAM
brltty 733 root 4r FIFO 0,12 0t0 892 pipe
brltty 733 root 5w FIFO 0,12 0t0 892 pipe
brltty 733 root 6r FIFO 0,12 0t0 893 pipe
brltty 733 root 7w FIFO 0,12 0t0 893 pipe
brltty 733 root 8r FIFO 0,12 0t0 21729 pipe
brltty 733 root 9w FIFO 0,12 0t0 21729 pipe
brltty 733 root 10w CHR 4,0 0t0 13 /dev/tty0
brltty 733 root 11u a_inode 0,13 0 9097 [eventfd]
brltty 733 root 12u a_inode 0,13 0 9097 [eventfd]
brltty 733 root 13u CHR 7,128 0t0 16 /dev/vcsa
brltty 733 root 14u CHR 10,223 0t0 334 /dev/uinput
brltty 733 root 15u unix 0xffff97a32ac4a400 0t0 896 type=STREAM
brltty 733 root 16r FIFO 0,12 0t0 19413 pipe
brltty 733 root 17w FIFO 0,12 0t0 19413 pipe
brltty 733 root 18r FIFO 0,12 0t0 12762 pipe
brltty 733 root 19w FIFO 0,12 0t0 12762 pipe
brltty 733 root 20u CHR 7,64 0t0 15 /dev/vcsu
brltty 733 root 21w CHR 4,0 0t0 13 /dev/tty0
brltty 733 root 22u unix 0xffff979bc7059400 0t0 22052 type=STREAM
brltty 733 root 23u a_inode 0,13 0 9097 [eventfd]
brltty 733 root 24u unix 0xffff979bc697dc00 0t0 22736 /var/lib/BrlAPI/0 type=STREAM
brltty 733 root 26u IPv4 22053 0t0 TCP localhost:4101 (LISTEN)
brltty 733 root 27u IPv6 23797 0t0 TCP localhost:4101 (LISTEN)
——
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