{"record":{"id":"245a8c2ae756a52d","repo":"nginx/nginx","slug":"ngx-log-alert-245a8c","errorCode":"NGX_LOG_ALERT","errorMessage":"file buf in writev t:%d r:%d f:%d %p %p-%p %p %O-%O","messagePattern":"file buf in writev t:(.+?) r:(.+?) f:(.+?) %p %p-%p %p %O-%O","errorType":"console","errorClass":null,"httpStatus":null,"severity":"error","filePath":"src/os/unix/ngx_writev_chain.c","lineNumber":63,"sourceCode":"\n    send = 0;\n\n    vec.iovs = iovs;\n    vec.nalloc = NGX_IOVS_PREALLOCATE;\n\n    for ( ;; ) {\n        prev_send = send;\n\n        /* create the iovec and coalesce the neighbouring bufs */\n\n        cl = ngx_output_chain_to_iovec(&vec, in, limit - send, c->log);\n\n        if (cl == NGX_CHAIN_ERROR) {\n            return NGX_CHAIN_ERROR;\n        }\n\n        if (cl && cl->buf->in_file) {\n            ngx_log_error(NGX_LOG_ALERT, c->log, 0,\n                          \"file buf in writev \"\n                          \"t:%d r:%d f:%d %p %p-%p %p %O-%O\",\n                          cl->buf->temporary,\n                          cl->buf->recycled,\n                          cl->buf->in_file,\n                          cl->buf->start,\n                          cl->buf->pos,\n                          cl->buf->last,\n                          cl->buf->file,\n                          cl->buf->file_pos,\n                          cl->buf->file_last);\n\n            ngx_debug_point();\n\n            return NGX_CHAIN_ERROR;\n        }\n\n        send += vec.size;","sourceCodeStart":45,"sourceCodeEnd":81,"githubUrl":"https://github.com/nginx/nginx/blob/3f6f7824d4e2eb1ac37dec76683d525ac0ff521c/src/os/unix/ngx_writev_chain.c#L45-L81","documentation":"Error \"file buf in writev t:%d r:%d f:%d %p %p-%p %p %O-%O\" thrown in nginx/nginx.","triggerScenarios":"Thrown at src/os/unix/ngx_writev_chain.c:63 when the library encounters an invalid state.","commonSituations":"See trigger scenarios.","solutions":[],"exampleFix":null,"handlingStrategy":null,"validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"3f6f7824d4e2eb1ac37dec76683d525ac0ff521c","analyzedAt":"2026-08-22T03:09:46.447Z","schemaVersion":2},"datasetVersion":"2026-08-22T04:17:13.399Z"}