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917ac77846
[BUG] Test case btrfs/027 would crash with subpage (64K page size, 4K sectorsize) with the following dying messages: debug: map_length=16384 length=65536 type=metadata|raid6(0x104) assertion failed: map_length >= length, in fs/btrfs/volumes.c:8093 ------------[ cut here ]------------ kernel BUG at fs/btrfs/messages.c:259! Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 Call trace: btrfs_assertfail+0x28/0x2c [btrfs] btrfs_map_repair_block+0x150/0x2b8 [btrfs] btrfs_repair_io_failure+0xd4/0x31c [btrfs] btrfs_read_extent_buffer+0x150/0x16c [btrfs] read_tree_block+0x38/0xbc [btrfs] read_tree_root_path+0xfc/0x1bc [btrfs] btrfs_get_root_ref.part.0+0xd4/0x3a8 [btrfs] open_ctree+0xa30/0x172c [btrfs] btrfs_mount_root+0x3c4/0x4a4 [btrfs] legacy_get_tree+0x30/0x60 vfs_get_tree+0x28/0xec vfs_kern_mount.part.0+0x90/0xd4 vfs_kern_mount+0x14/0x28 btrfs_mount+0x114/0x418 [btrfs] legacy_get_tree+0x30/0x60 vfs_get_tree+0x28/0xec path_mount+0x3e0/0xb64 __arm64_sys_mount+0x200/0x2d8 invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0x60/0x11c do_el0_svc+0x38/0x98 el0_svc+0x40/0xa8 el0t_64_sync_handler+0xf4/0x120 el0t_64_sync+0x190/0x194 Code: aa0403e2 b0fff060 91010000 959c2024 (d4210000) [CAUSE] In btrfs/027 we test RAID6 with missing devices, in this particular case, we're repairing a metadata at the end of a data stripe. But at btrfs_repair_io_failure(), we always pass a full PAGE for repair, and for subpage case this can cross stripe boundary and lead to the above BUG_ON(). This metadata repair code is always there, since the introduction of subpage support, but this can trigger BUG_ON() after the bio split ability at btrfs_map_bio(). [FIX] Instead of passing the old PAGE_SIZE, we calculate the correct length based on the eb size and page size for both regular and subpage cases. CC: stable@vger.kernel.org # 6.3+ Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.