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kdave / btrfs-progs

Development of userspace BTRFS tools
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`check --mode=lowmem` loops on fuzzed image `bko-155621-bad-block-group-offset` #788

Closed kdave closed 1 week ago

kdave commented 1 month ago

In original mode check works

--mode=original [1/7] checking root items [2/7] checking extents corrupt extent record: key [131072,169,4096] corrupt extent record: key [4194304,169,4096] corrupt extent record: key [4198400,169,4096] corrupt extent record: key [4202496,169,4096] corrupt extent record: key [4227072,169,4096] corrupt extent record: key [4231168,169,4096] corrupt extent record: key [4235264,169,4096] Chunk[256, 228, 0]: length(4194304), offset(0), type(2) is not found in block group Chunk[256, 228, 4194304]: length(1638400), offset(4194304), type(5) mismatch with block group[4194304, 192, 1638400]: offset(1638400), objectid(4194304), flags(21474836480) Chunk[256, 228, 5832704]: length(1638400), offset(5832704), type(5) mismatch with block group[5832704, 192, 1638400]: offset(1638400), objectid(5832704), flags(21474836480) Block group[0, 0] (flags = 8589934592) didn't find the relative chunk. Block group[4194304, 1638400] (flags = 21474836480) didn't find the relative chunk. Block group[5832704, 1638400] (flags = 21474836480) didn't find the relative chunk. ref mismatch on [131072 4096] extent item 4294967296, found 1 tree extent[131072, 4096] root 3 has no backref item in extent tree backpointer mismatch on [131072 4096] bad extent [131072, 135168), type mismatch with chunk ERROR: invalid generation for extent 4194304, have 17179869184 expect (0, 6] ref mismatch on [4194304 4096] extent item 4294967296, found 1 tree extent[4194304, 4096] root 5 has no backref item in extent tree backpointer mismatch on [4194304 4096] bad extent [4194304, 4198400), type mismatch with chunk ref mismatch on [4198400 4096] extent item 4294967296, found 1 tree extent[4198400, 4096] root 1 has no backref item in extent tree backpointer mismatch on [4198400 4096] bad extent [4198400, 4202496), type mismatch with chunk ref mismatch on [4202496 4096] extent item 4294967296, found 1 tree extent[4202496, 4096] root 2 has no backref item in extent tree backpointer mismatch on [4202496 4096] bad extent [4202496, 4206592), type mismatch with chunk ERROR: invalid generation for extent 4227072, have 17179869184 expect (0, 6] ref mismatch on [4227072 4096] extent item 4294967296, found 1 tree extent[4227072, 4096] root 4 has no backref item in extent tree backpointer mismatch on [4227072 4096] bad extent [4227072, 4231168), type mismatch with chunk ERROR: invalid generation for extent 4231168, have 17179869184 expect (0, 6] ref mismatch on [4231168 4096] extent item 8589934591, found 1 tree extent[4231168, 4096] root 7 has no backref item in extent tree backpointer mismatch on [4231168 4096] bad extent [4231168, 4235264), type mismatch with chunk ERROR: invalid generation for extent 4235264, have 17179869184 expect (0, 6] ref mismatch on [4235264 4096] extent item 4294967296, found 0 owner ref check failed [4235264 4096] bad extent [4235264, 4239360), type mismatch with chunk ERROR: errors found in extent allocation tree or chunk allocation [3/7] checking free space cache [4/7] checking fs roots [5/7] checking only csums items (without verifying data) [6/7] checking root refs [7/7] checking quota groups skipped (not enabled on this FS) Opening filesystem to check... Checking filesystem on bko-155621-bad-block-group-offset.raw.restored UUID: 5cb33553-6f6d-4ce8-83fd-20af5a2f8181 found 28672 bytes used, error(s) found total csum bytes: 0 total tree bytes: 24576 total fs tree bytes: 4096 total extent tree bytes: 4096 btree space waste bytes: 19892 file data blocks allocated: 0 referenced 0

In --mode=lowmem it loops up to versions 6.5 at least and on 6.1 it crashes:

loop [1/7] checking root items [2/7] checking extents kernel-shared/backref.c:653: __add_inline_refs: Warning: assertion `1` failed, value 1 btrfs(+0xf3e8e)[0x557b017d7e8e] btrfs(+0xf4806)[0x557b017d8806] btrfs(+0xd2d2a)[0x557b017b6d2a] btrfs(+0xdf688)[0x557b017c3688] btrfs(check_chunks_and_extents_lowmem+0x4e)[0x557b017c787e] btrfs(+0xb5c69)[0x557b01799c69] btrfs(main+0x8f)[0x557b01700f9f] /lib64/libc.so.6(+0x2a1f0)[0x7f2cd2e2a1f0] /lib64/libc.so.6(__libc_start_main+0x8b)[0x7f2cd2e2a2b9] btrfs(_start+0x27)[0x557b017024f5] kernel-shared/backref.c:653: __add_inline_refs: Warning: assertion `1` failed, value 1 btrfs(+0xf3e8e)[0x557b017d7e8e] btrfs(+0xf4806)[0x557b017d8806] btrfs(+0xd2d2a)[0x557b017b6d2a] btrfs(+0xdf688)[0x557b017c3688] btrfs(check_chunks_and_extents_lowmem+0x4e)[0x557b017c787e] btrfs(+0xb5c69)[0x557b01799c69] btrfs(main+0x8f)[0x557b01700f9f] /lib64/libc.so.6(+0x2a1f0)[0x7f2cd2e2a1f0] /lib64/libc.so.6(__libc_start_main+0x8b)[0x7f2cd2e2a2b9] btrfs(_start+0x27)[0x557b017024f5] kernel-shared/backref.c:653: __add_inline_refs: Warning: assertion `1` failed, value 1 btrfs(+0xf3e8e)[0x557b017d7e8e] btrfs(+0xf4806)[0x557b017d8806] btrfs(+0xd2d2a)[0x557b017b6d2a] btrfs(+0xdf688)[0x557b017c3688] btrfs(check_chunks_and_extents_lowmem+0x4e)[0x557b017c787e] btrfs(+0xb5c69)[0x557b01799c69] btrfs(main+0x8f)[0x557b01700f9f] /lib64/libc.so.6(+0x2a1f0)[0x7f2cd2e2a1f0] /lib64/libc.so.6(__libc_start_main+0x8b)[0x7f2cd2e2a2b9] btrfs(_start+0x27)[0x557b017024f5] ...
kdave commented 1 week ago

Fixed in devel.