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To: Gao Xiang , Gao Xiang , Chao Yu , linux-erofs@lists.ozlabs.org Cc: Linux Kernel Mailing List , Stefan Kerkmann References: <38d43fae-1182-4155-9c5b-ffc7382d9917@siemens.com> <452a2155-ab3b-43d1-8783-0f1db13a675f@siemens.com> <81a3d28b-4570-4d44-8ed6-51158353c0ff@siemens.com> <6216008a-dc0c-4f90-a67c-36bead99d7f2@linux.alibaba.com> <2bfd263e-d6f7-4dcd-adf5-2518ba34c36b@linux.alibaba.com> <7f9d35af-d71b-46c5-b0ea-216bbf68dfe7@siemens.com> <17432623-6d5d-4a8d-b4ae-8099c589b5e4@linux.alibaba.com> From: Jan Kiszka Content-Language: en-US Autocrypt: addr=jan.kiszka@siemens.com; keydata= xsFNBGZY+hkBEACkdtFD81AUVtTVX+UEiUFs7ZQPQsdFpzVmr6R3D059f+lzr4Mlg6KKAcNZ uNUqthIkgLGWzKugodvkcCK8Wbyw+1vxcl4Lw56WezLsOTfu7oi7Z0vp1XkrLcM0tofTbClW xMA964mgUlBT2m/J/ybZd945D0wU57k/smGzDAxkpJgHBrYE/iJWcu46jkGZaLjK4xcMoBWB I6hW9Njxx3Ek0fpLO3876bszc8KjcHOulKreK+ezyJ01Hvbx85s68XWN6N2ulLGtk7E/sXlb 79hylHy5QuU9mZdsRjjRGJb0H9Buzfuz0XrcwOTMJq7e7fbN0QakjivAXsmXim+s5dlKlZjr L3ILWte4ah7cGgqc06nFb5jOhnGnZwnKJlpuod3pc/BFaFGtVHvyoRgxJ9tmDZnjzMfu8YrA +MVv6muwbHnEAeh/f8e9O+oeouqTBzgcaWTq81IyS56/UD6U5GHet9Pz1MB15nnzVcyZXIoC roIhgCUkcl+5m2Z9G56bkiUcFq0IcACzjcRPWvwA09ZbRHXAK/ao/+vPAIMnU6OTx3ejsbHn oh6VpHD3tucIt+xA4/l3LlkZMt5FZjFdkZUuAVU6kBAwElNBCYcrrLYZBRkSGPGDGYZmXAW/ VkNUVTJkRg6MGIeqZmpeoaV2xaIGHBSTDX8+b0c0hT/Bgzjv8QARAQABzSNKYW4gS2lzemth IDxqYW4ua2lzemthQHNpZW1lbnMuY29tPsLBlAQTAQoAPhYhBABMZH11cs99cr20+2mdhQqf QXvYBQJmWPvXAhsDBQkFo5qABQsJCAcCBhUKCQgLAgQWAgMBAh4BAheAAAoJEGmdhQqfQXvY zPAP/jGiVJ2VgPcRWt2P8FbByfrJJAPCsos+SZpncRi7tl9yTEpS+t57h7myEKPdB3L+kxzg K3dt1UhYp4FeIHA3jpJYaFvD7kNZJZ1cU55QXrJI3xu/xfB6VhCs+VAUlt7XhOsOmTQqCpH7 pRcZ5juxZCOxXG2fTQTQo0gfF5+PQwQYUp0NdTbVox5PTx5RK3KfPqmAJsBKdwEaIkuY9FbM 9lGg8XBNzD2R/13cCd4hRrZDtyegrtocpBAruVqOZhsMb/h7Wd0TGoJ/zJr3w3WnDM08c+RA 5LHMbiA29MXq1KxlnsYDfWB8ts3HIJ3ROBvagA20mbOm26ddeFjLdGcBTrzbHbzCReEtN++s gZneKsYiueFDTxXjUOJgp8JDdVPM+++axSMo2js8TwVefTfCYt0oWMEqlQqSqgQwIuzpRO6I ik7HAFq8fssy2cY8Imofbj77uKz0BNZC/1nGG1OI9cU2jHrqsn1i95KaS6fPu4EN6XP/Gi/O 0DxND+HEyzVqhUJkvXUhTsOzgzWAvW9BlkKRiVizKM6PLsVm/XmeapGs4ir/U8OzKI+SM3R8 VMW8eovWgXNUQ9F2vS1dHO8eRn2UqDKBZSo+qCRWLRtsqNzmU4N0zuGqZSaDCvkMwF6kIRkD ZkDjjYQtoftPGchLBTUzeUa2gfOr1T4xSQUHhPL8zsFNBGZY+hkBEADb5quW4M0eaWPIjqY6 aC/vHCmpELmS/HMa5zlA0dWlxCPEjkchN8W4PB+NMOXFEJuKLLFs6+s5/KlNok/kGKg4fITf Vcd+BQd/YRks3qFifckU+kxoXpTc2bksTtLuiPkcyFmjBph/BGms35mvOA0OaEO6fQbauiHa QnYrgUQM+YD4uFoQOLnWTPmBjccoPuiJDafzLxwj4r+JH4fA/4zzDa5OFbfVq3ieYGqiBrtj tBFv5epVvGK1zoQ+Rc+h5+dCWPwC2i3cXTUVf0woepF8mUXFcNhY+Eh8vvh1lxfD35z2CJeY txMcA44Lp06kArpWDjGJddd+OTmUkFWeYtAdaCpj/GItuJcQZkaaTeiHqPPrbvXM361rtvaw XFUzUlvoW1Sb7/SeE/BtWoxkeZOgsqouXPTjlFLapvLu5g9MPNimjkYqukASq/+e8MMKP+EE v3BAFVFGvNE3UlNRh+ppBqBUZiqkzg4q2hfeTjnivgChzXlvfTx9M6BJmuDnYAho4BA6vRh4 Dr7LYTLIwGjguIuuQcP2ENN+l32nidy154zCEp5/Rv4K8SYdVegrQ7rWiULgDz9VQWo2zAjo TgFKg3AE3ujDy4V2VndtkMRYpwwuilCDQ+Bpb5ixfbFyZ4oVGs6F3jhtWN5Uu43FhHSCqUv8 FCzl44AyGulVYU7hTQARAQABwsF8BBgBCgAmFiEEAExkfXVyz31yvbT7aZ2FCp9Be9gFAmZY +hkCGwwFCQWjmoAACgkQaZ2FCp9Be9hN3g/8CdNqlOfBZGCFNZ8Kf4tpRpeN3TGmekGRpohU bBMvHYiWW8SvmCgEuBokS+Lx3pyPJQCYZDXLCq47gsLdnhVcQ2ZKNCrr9yhrj6kHxe1Sqv1S MhxD8dBqW6CFe/mbiK9wEMDIqys7L0Xy/lgCFxZswlBW3eU2Zacdo0fDzLiJm9I0C9iPZzkJ gITjoqsiIi/5c3eCY2s2OENL9VPXiH1GPQfHZ23ouiMf+ojVZ7kycLjz+nFr5A14w/B7uHjz uL6tnA+AtGCredDne66LSK3HD0vC7569sZ/j8kGKjlUtC+zm0j03iPI6gi8YeCn9b4F8sLpB lBdlqo9BB+uqoM6F8zMfIfDsqjB0r/q7WeJaI8NKfFwNOGPuo93N+WUyBi2yYCXMOgBUifm0 T6Hbf3SHQpbA56wcKPWJqAC2iFaxNDowcJij9LtEqOlToCMtDBekDwchRvqrWN1mDXLg+av8 qH4kDzsqKX8zzTzfAWFxrkXA/kFpR3JsMzNmvextkN2kOLCCHkym0zz5Y3vxaYtbXG2wTrqJ 8WpkWIE8STUhQa9AkezgucXN7r6uSrzW8IQXxBInZwFIyBgM0f/fzyNqzThFT15QMrYUqhhW ZffO4PeNJOUYfXdH13A6rbU0y6xE7Okuoa01EqNi9yqyLA8gPgg/DhOpGtK8KokCsdYsTbk= In-Reply-To: <17432623-6d5d-4a8d-b4ae-8099c589b5e4@linux.alibaba.com> Content-Type: text/plain; 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After playing with >>>>>>>>>> various >>>>>>>>>> parameters, it rather looks like the latter: >>>>>>>>>> >>>>>>>>>> $ ls -l erofs-dir/ >>>>>>>>>> total 132 >>>>>>>>>> -rwxr-xr-x 1 1000 users 132868 Jul  8 10:50 dash >>>>>>>>>> (from Debian bookworm) >>>>>>>>>> $ mkfs.erofs -z lz4hc erofs.img erofs-dir/ >>>>>>>>>> mkfs.erofs 1.8.6 (trixie version, but same happens with bookworm >>>>>>>>>> 1.5) >>>>>>>>>> Build completed. >>>>>>>>>> ------ >>>>>>>>>> Filesystem UUID: aae0b2f0-4ee4-4850-af49-3c1aad7fa30c >>>>>>>>>> Filesystem total blocks: 17 (of 4096-byte blocks) >>>>>>>>>> Filesystem total inodes: 2 >>>>>>>>>> Filesystem total metadata blocks: 1 >>>>>>>>>> Filesystem total deduplicated bytes (of source files): 0 >>>>>>>>>> >>>>>>>>>> Now I have 6.15-rc5 and a defconfig-close setting for the 32- >>>>>>>>>> bit ARM >>>>>>>>>> target BeagleBone Black. When booting into init=/bin/sh, then >>>>>>>>>> running >>>>>>>>>> >>>>>>>>>> # mount -t erofs /dev/mmcblk0p1 /mnt >>>>>>>>>> erofs (device mmcblk0p1): mounted with root inode @ nid 36. >>>>>>>>>> # /mnt/dash >>>>>>>>>> Segmentation fault >>>>> >>>>> Two extra quick questions: >>>>>    - If the segfault happens, then if you run /mnt/dash again, does >>>>>      segfault still happen? >>>>> >>>>>    - If the /mnt/dash segfault happens, then if you run >>>>>        cat /mnt/dash > /dev/null >>>>>        /mnt/dash >>>>>      does segfault still happen? >>>> >>>> Oh, sorry I didn't read the full hints, could you check if >>>> the following patch resolve the issue (space-damaged)? >>>> >>>> diff --git a/fs/erofs/data.c b/fs/erofs/data.c >>>> index 6a329c329f43..701490b3ef7d 100644 >>>> --- a/fs/erofs/data.c >>>> +++ b/fs/erofs/data.c >>>> @@ -245,6 +245,7 @@ void erofs_onlinefolio_end(struct folio *folio, int >>>> err) >>>>          if (v & ~EROFS_ONLINEFOLIO_EIO) >>>>                  return; >>>>          folio->private = 0; >>>> +       flush_dcache_folio(folio); >>>>          folio_end_read(folio, !(v & EROFS_ONLINEFOLIO_EIO)); >>>>   } >>>> >>> >>> Yeah, indeed that seem to have helped with the minimal test. Will do the >>> full scenario test (complete rootfs) next. >>> >> >> And that looks good as! Thanks a lot for that quick fix - hoping that is >> the real solution already. >> >> BTW, that change does not look very specific to the armhf arch, rather >> like we were lucky that it didn't hit elsewhere, right? > > I may submit a formal patch tomorrow. > Great thanks. I quickly checked backports, and it fits cleanly on 6.12, but at least 6.1 requires more work to find a home there as well. > This issue doesn't impact x86 and arm64. For example on arm64, > PG_dcache_clean is clear when it's a new page cache folio. > > But it seems on arm platform flush_dcache_folio() does more > to handle D-cache aliasing so some caching setup may be > impacted. Yeah, that would explain it. And Stefan (on CC) was on an arm32 as well back then. Jan -- Siemens AG, Foundational Technologies Linux Expert Center