Sound through ALSA, a 2D game, and a stack walk that cannot panic
SDL 3 has no OSS backend and SchOS has no ALSA kernel side, so sound now goes SDL -> alsa-lib -> alsa-plugins' OSS plugin -> /dev/dsp. That path found two bugs underneath it: - ac97: resetting the PCM-out box also clears the descriptor list address, and nothing set it again. Every stream after the first stop played a "list" at physical address 0 -- silence -- and ALSA resets before each stream. If the engine halts at the end of the queue, the run bit is set again. - /dev/dsp: SETFRAGMENT, GETFMTS, GETCAPS, SETTRIGGER, GETOPTR and GETODELAY for the plugin's ring-and-pointer model, and poll(), writable once a whole fragment fits (ALSA spun at 76% CPU otherwise). speaker-test now plays in real time at 0% CPU, verified in a recording of QEMU's AC'97. - /etc/asound.conf: the default device is a plug to the OSS device at 16-bit stereo 48 kHz, what every SchOS audio driver plays. Also: - getstackpcs: each frame link must go up the same stack by less than KSTACKSIZE. The chain ends at the syscall entry with the user's rbp, which lbreakouthd uses as a register (-1024); the walk dereferenced it under the syscall tracer and the kernel panicked inside acquire(). - fb: FBIOGET_VSCREENINFO reports nominal timings, as Linux's efifb does, instead of zeros, which Xorg's fbdev turned into a 0 Hz RandR mode. - procdump (Ctrl-P) shows where runnable threads are in user space. - World: lbreakouthd instead of lbreakout2 (its stk.c passes vsnprintf a size of 511 plus the prefix length, and Alpine's fortified headers trap on that), plus curl, alsa-lib and alsa-plugins. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01S1giNvrHTrPMPw7V6x1kQ4
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Nexoniarz
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11 changed files with 237 additions and 12 deletions
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# Generated by tools/posix/alpine-lock.sh from world. Do not edit;
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# change world and run `make alpine-lock`.
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# file sha256 repository
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alsa-lib-1.2.15.3-r0.apk 052de5639df635a03cfae1d7504ed4ed75c4e2d2cfff59efc116bb847c1f4ac4 main
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alsa-plugins-1.2.12-r2.apk 0ac6513add2a5268f67231b241473b4b7b43f5aad9f4674c900525e5152e0752 community
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at-spi2-core-2.60.5-r0.apk c9989ba9b2ff44f87a2106ca9560c2e554a56811d0fc2863b22741d576f1d84f main
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at-spi2-core-libs-2.60.5-r0.apk bcd4846311c8b19ad7e08ffc3cf726ddbe3d36bbc524386bda64758f5c5981a6 main
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avahi-libs-0.9_rc4-r0.apk 380d59c58cfce9cb5cf342cf73947749ca77a880f729970e2f508aaa6fc2f713 main
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@ -17,6 +19,8 @@ cairo-gobject-1.18.4-r1.apk ec302c75a24edaa4a2f867cfb5eec85cf30efe184044bab6e2b9
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c-ares-1.34.9-r0.apk 3539a3e11c1ef1516117d8179a546ac882086e94e0d78ad51d687b3fa2b3b5f2 main
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cmatrix-2.0-r2.apk d9f6bea3851492a6db2a9cd3f7e2df0f0756c6651a702b36ed2b887328ad1f00 community
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cups-libs-2.4.19-r1.apk 5739c568d90f23006d74ff82619e1a18447a6f698ae2af61970debe6658a7bea main
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curl-8.22.0-r0.apk 9262352e6341bb87e3047d1ca0b4051b2a9f4011409df25e4190e6be0334b860 main
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curl-zsh-completion-8.22.0-r0.apk 182a5f0afb5fd8786137f4610c065c305aa593fd18994df908c146335fb6011c main
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dbus-libs-1.16.2-r2.apk 105f6ba17454c587ca9345f9deb348012d1950588a22da42120c954d396c99b6 main
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e2fsprogs-libs-1.47.4-r0.apk 2e067395a6981b06cfd2cd3abf0e6c6574f7ef64d02e01f75fc5323d4a337fb9 main
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encodings-1.1.0-r0.apk f7c0eb762638d0249b4fbbe07a8e4ed6aab8e86b74c239c40e47a36219777d52 main
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@ -44,7 +48,8 @@ harfbuzz-13.2.1-r0.apk 01f7862265ef2256bbadd0fc998df3d1243dee606df3bd8284471cf39
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htop-3.5.3-r0.apk 6f6d444ca9a4133c2c13323ded04128783d59f924bcff0276d150a982904a2f3 main
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hwdata-pci-0.408-r0.apk fe61404e6d2bd1e04c021d53641c0ebce97911084d77994e43a288a1278686c1 main
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hwdata-usb-0.408-r0.apk 272d365cb05dd085dd8022154cf71e3f3b0aaddd41c1269eeaf939c9d38675c8 main
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lbreakout2-2.6.5-r2.apk 2c0f448af62e8138d9e612a858198f4bb906af33db50a32bb4bd468239521449 community
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lbreakouthd-1.2.2-r0.apk 4d7f78d866a7c544132e5f159d18f978515ac948517f2b8a6c625756bb81a3e0 community
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lbreakouthd-data-1.2.2-r0.apk 28ce98df27bfbb442fa397fbb9eb3eb5464e5b7b040ea034f207be52f4f4f07f community
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lcms2-2.19-r0.apk b4cb038af3c2f02bedd8456ae876c97ac0a9f29789add77871bfd6ce084ff136 main
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libatk-1.0-2.60.5-r0.apk ab5f603b17f0f0c5577d259b8263c5cbc6c7b3fd031f06ddc1e3e26417e1609a main
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libatk-bridge-2.0-2.60.5-r0.apk f5e38bc54bae780680134f7b96ce8e01ef24e98ae0ac67ded7229af07aa0b0f1 main
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@ -78,6 +83,7 @@ libpciaccess-0.19-r0.apk 03fdccd1e2a0825e7f7fabbac67212e05d271d31d2eff44cc92f707
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libpng-1.6.59-r0.apk d16aeb0597f2bc43e0583ac9ff779388ec160c3e22568b640122e94ba55be6d7 main
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libpsl-0.21.5-r3.apk ec665a344b6e887f00f0a47015cc732c3a281b69e84641dc8662ea234fde6cdb main
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librsvg-2.62.3-r0.apk e2aeb4a2b6b1ab20627dbb0e9136ea90f7120ec61412ed52f4335ee231361fde community
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libsamplerate-0.2.2-r3.apk d47765972e0f4b7c5585a5b27957ffe9bc63d4cc9729134fd876ee5d3f5f986d main
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libseccomp-2.6.1-r0.apk b22ccfe8cb072e4c8d3bc17222eeda132e270ce6258c27622acb193bf27b48e1 main
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libsharpyuv-1.6.0-r0.apk 34621ff53f43030d24d1224fe9cb53b1590ab614cbce6080005cde703e6c874a main
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libsm-1.2.6-r0.apk dd7eff58a46fd60e4afee9c7c1c3508920b0e1d6560129e59aee82329f68afc8 main
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@ -138,10 +144,11 @@ pango-1.57.1-r0.apk c616b62df908026ef413b338b9043e36706b05b6d035049394e5d14022e6
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pcre2-10.49-r0.apk 2919897914820f42a17a8d7d37df310d2dfad1c82ebe5f539cc5c765f916752a main
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pixman-0.46.4-r0.apk 378550cbe348dda9b0733014375dba87a89f0077c5f3dbeba7dce8dbcdda707e main
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pkgconf-2.5.1-r0.apk 20cc47b76b82e9424a35ecc4fdd7bd904ef49ada1684214910fae31bc0cab737 main
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sdl12-compat-1.2.76-r1.apk 124791270d613d1e33115625b95725487fe76ccfbc08638b8baa1b180287deb9 community
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sdl2-compat-2.32.68-r0.apk 0c4c1279446cba3c2065a3d3c2cacfa9eb4aeff507757c5a37193aaf028c5cf7 community
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sdl2_image-2.8.12-r0.apk 9d9f337de7fe25c363700701b8dd76ff4026de9c3d977e321ada08058b57eeda community
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sdl2_mixer-2.8.2-r0.apk 504b68ae9cf6705942853bb6977d3b341615c72066031e5aff54d0c6aca76964 community
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sdl2_ttf-2.24.0-r0.apk 0efcd7f03a1c70fc87706b0bb1e95b8747a1b796f089af56f296bf764ac8d988 community
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sdl3-3.4.10-r0.apk e9e4537d455f8b710a1f6fed7607c3cdb492fdc155684cf38e1b054bba809427 community
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sdl_mixer-1.2.12-r3.apk 9733a4e906b76f8bb5f246578ffc123a39a489fbfe60212abbaaaa0782e62e1c community
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shared-mime-info-2.4-r7.apk b0ed78b502cacfa2dfb6ff87aaef36a034258026873ab5b73f5e603d6623a147 main
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sl-5.02-r1.apk aa3ceb845953904ab61459f0f97416903c56a80b428f8bc320d879b9e58c1a57 community
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slang-2.3.3-r3.apk 96daf8e02cbcc0d4fd7163d087ae2a71a1aea279a0ac8d2a00a1612ccdccf644 main
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