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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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15e5cda9e6
in the kernel. The splice logic wants a full page from the ring buffer but the ring_buffer_wait() returns when there's any data in the ring buffer. The splice code would then continue the loop waiting for a full page. But if a full page never happens, the splice code will never sleep and just continue to loop. There's another case that Rabin fixed that could loop if there's no memory and kmalloc() constantly returns NULL. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQEcBAABAgAGBQJUYgiFAAoJEEjnJuOKh9ldRuoIAMHOx/TgIYSPuVQBWuljoELZ Mbaq5EGPkJ0fdwP9+X3JPG7pFazcP8+xZx7iVKYihazgS7BkF/khbxsgPl5ZSGOf j39kSoWK1ZzKIbM3MMjIBgZ2LF8wL1VoRu/dyI7GXWeBt9Dnj7vDtkoSGCYjDJ9B UBK2E3vjwNxc4Z9U3YRZj7U4GEKwMkpddKv0DIfAmzA4tF1CryuGmvpkRtGi6wc0 vs6OV1jqFa300v8ckFvTrO/UdBVnisVWHmBrP6XXB/Likz/6+56pphCRvoc/LskG kFHCsjXXJ/tI+/RdhQt/dqgKDl7Cs3nIhXwMZ/TbaxGdFT6kbq3xbVpRk1L90/U= =v5/I -----END PGP SIGNATURE----- Merge tag 'trace-fixes-v3.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace Pull tracing fix from Steven Rostedt: "Rabin Vincent found a way that tracing could cause an infinite loop in the kernel. The splice logic wants a full page from the ring buffer but the ring_buffer_wait() returns when there's any data in the ring buffer. The splice code would then continue the loop waiting for a full page. But if a full page never happens, the splice code will never sleep and just continue to loop. There's another case that Rabin fixed that could loop if there's no memory and kmalloc() constantly returns NULL" * tag 'trace-fixes-v3.18-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: tracing: Do not risk busy looping in buffer splice tracing: Do not busy wait in buffer splice |
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