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Groups > linux.debian.kernel > #64398 > unrolled thread
| Started by | Anton Ivanov <anton.ivanov@kot-begemot.co.uk> |
|---|---|
| First post | 2019-07-08 13:40 +0200 |
| Last post | 2019-07-08 14:40 +0200 |
| Articles | 2 — 1 participant |
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Bug#931500: Acknowledgement (linux-image-4.19.0-5-amd64: kernel deadlock with autofs) Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-07-08 13:40 +0200
Bug#931500: Acknowledgement (linux-image-4.19.0-5-amd64: kernel deadlock with autofs) Anton Ivanov <anton.ivanov@kot-begemot.co.uk> - 2019-07-08 14:40 +0200
| From | Anton Ivanov <anton.ivanov@kot-begemot.co.uk> |
|---|---|
| Date | 2019-07-08 13:40 +0200 |
| Subject | Bug#931500: Acknowledgement (linux-image-4.19.0-5-amd64: kernel deadlock with autofs) |
| Message-ID | <yhA9X-63s-11@gated-at.bofh.it> |
On 08/07/2019 11:59, Anton Ivanov wrote: > There are clearly some issues with nfs across an autofs mount (maybe > for hard mounts as well), so this may warrant an upgrade. > > Example test. Run make -j 12 ; make clean in a loop on an nfs mounted > openwrt tree until it fails (usually 2-3 iterations). > > State on the client > > ls -laF > /var/autofs/local/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm > > total 8 > drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ > drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ > > State as seen on the server (mounted via nfs across localhost): > > ls -laF > /var/autofs/local/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm > total 12 > drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ > drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ > -rw-r--r-- 1 anivanov anivanov 32 Jul 8 11:40 ipcbuf.h > > State on the filesystem: > > ls -laF > /exports/work/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm > total 12 > drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ > drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ > -rw-r--r-- 1 anivanov anivanov 32 Jul 8 11:40 ipcbuf.h > > So actually this looks like the caching on NFS is royally fubar Dropping caches restores things to normal, but that is not a solution. It is a diagnosis. -- Anton R. Ivanov https://www.kot-begemot.co.uk/
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| From | Anton Ivanov <anton.ivanov@kot-begemot.co.uk> |
|---|---|
| Date | 2019-07-08 14:40 +0200 |
| Message-ID | <yhB63-6C4-31@gated-at.bofh.it> |
| In reply to | #64398 |
The most interesting part - it is always the same file. ls -laF /var/autofs/local/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm/ipcbuf.h It becomes invisible from the client, but exists in the server. Usually takes ~4-5 builds in a loop to achieve that. A. On 08/07/2019 12:01, Anton Ivanov wrote: > > On 08/07/2019 11:59, Anton Ivanov wrote: >> There are clearly some issues with nfs across an autofs mount (maybe >> for hard mounts as well), so this may warrant an upgrade. >> >> Example test. Run make -j 12 ; make clean in a loop on an nfs >> mounted openwrt tree until it fails (usually 2-3 iterations). >> >> State on the client >> >> ls -laF >> /var/autofs/local/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm >> >> total 8 >> drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ >> drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ >> >> State as seen on the server (mounted via nfs across localhost): >> >> ls -laF >> /var/autofs/local/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm >> total 12 >> drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ >> drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ >> -rw-r--r-- 1 anivanov anivanov 32 Jul 8 11:40 ipcbuf.h >> >> State on the filesystem: >> >> ls -laF >> /exports/work/src/openwrt/build_dir/target-mips_24kc_musl/linux-ar71xx_tiny/linux-4.14.125/arch/mips/include/generated/uapi/asm >> total 12 >> drwxr-xr-x 2 anivanov anivanov 4096 Jul 8 11:40 ./ >> drwxr-xr-x 3 anivanov anivanov 4096 Jul 8 11:40 ../ >> -rw-r--r-- 1 anivanov anivanov 32 Jul 8 11:40 ipcbuf.h >> >> So actually this looks like the caching on NFS is royally fubar > > Dropping caches restores things to normal, but that is not a solution. > It is a diagnosis. > -- Anton R. Ivanov https://www.kot-begemot.co.uk/
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