URL: https://bugzilla.kernel.org/show_bug.cgi?id=166361
Lukas Lueg 2016-09-17 16:45:53 UTC

More news from the fuzzer. The attached image causes a segmentation fault when
running btrfsck over it; using btrfs-progs v4.7.1-17-g2076992

The juicy parts:

==30530==ERROR: AddressSanitizer: SEGV on unknown address 0x62103031ae21 (pc 0x0000005f19b9 bp 0x7ffd4aa30a90 sp 0x7ffd4aa30a90 T0)
    #0 0x5f19b8 in btrfs_qgroup_status_flags /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:2136:1
    #1 0x5f16f5 in read_qgroup_status /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:885:10
    #2 0x5ef38a in load_quota_info /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:949:5
    #3 0x5eeefc in qgroup_verify_all /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:1351:8
    #4 0x51f08f in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11637:9
    #5 0x4f0f81 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
    #6 0x7f7eb11aa730 in __libc_start_main (/lib64/libc.so.6+0x20730)
    #7 0x4213f8 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4213f8)

parent transid verify failed on 4198400 wanted 4 found 5
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 4198400 wanted 26388280060160 found 5
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
checking extents
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
Chunk[256, 228, 0]: length(4194304), offset(0), type(2) is not found in block group
Chunk[256, 228, 0] stripe[1, 0] is not found in dev extent
Chunk[256, 228, 4194304]: length(1638400), offset(4194304), type(5) is not found in block group
Chunk[256, 228, 4194304] stripe[1, 4194304] is not found in dev extent
Chunk[256, 228, 5832704]: length(1638400), offset(5832704), type(5) is not found in block group
Chunk[256, 228, 5832704] stripe[1, 5832704] is not found in dev extent
ref mismatch on [0 4096] extent item 0, found 1
Backref 0 parent 0 root 0 not found in extent tree
backpointer mismatch on [0 4096]
ref mismatch on [131072 4096] extent item 0, found 1
Backref 131072 parent 3 root 3 not found in extent tree
backpointer mismatch on [131072 4096]
ref mismatch on [4198400 4096] extent item 0, found 1
Backref 4198400 parent 1 root 1 not found in extent tree
backpointer mismatch on [4198400 4096]
ref mismatch on [4231168 4096] extent item 0, found 1
Backref 4231168 parent 7 root 7 not found in extent tree
backpointer mismatch on [4231168 4096]
ref mismatch on [3472328296227680304 3472328296227680304] extent item 0, found 1
Backref 3472328296227680304 root 1 owner 2 offset 0 num_refs 0 not found in extent tree
Incorrect local backref count on 3472328296227680304 root 1 owner 2 offset 0 found 1 wanted 0 back 0x60800000bda0
backpointer mismatch on [3472328296227680304 3472328296227680304]
Dev extent's total-byte(0) is not equal to byte-used(7471104) in dev[1, 216, 1]
Errors found in extent allocation tree or chunk allocation
parent transid verify failed on 0 wanted 3472328296227680304 found 0
Ignoring transid failure
parent transid verify failed on 4198400 wanted 26388280060160 found 5
Ignoring transid failure
checking free space cache
checking fs roots
root 5 root dir 3472328296227680304 not found
checking csums
checking root refs
checking quota groups
ASAN:DEADLYSIGNAL
=================================================================
==30530==ERROR: AddressSanitizer: SEGV on unknown address 0x62103031ae21 (pc 0x0000005f19b9 bp 0x7ffd4aa30a90 sp 0x7ffd4aa30a90 T0)
    #0 0x5f19b8 in btrfs_qgroup_status_flags /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:2136:1
    #1 0x5f16f5 in read_qgroup_status /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:885:10
    #2 0x5ef38a in load_quota_info /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:949:5
    #3 0x5eeefc in qgroup_verify_all /home/lukas/dev/btrfsfuzz/src-asan/qgroup-verify.c:1351:8
    #4 0x51f08f in cmd_check /home/lukas/dev/btrfsfuzz/src-asan/cmds-check.c:11637:9
    #5 0x4f0f81 in main /home/lukas/dev/btrfsfuzz/src-asan/btrfs.c:243:8
    #6 0x7f7eb11aa730 in __libc_start_main (/lib64/libc.so.6+0x20730)
    #7 0x4213f8 in _start (/home/lukas/dev/btrfsfuzz/bin-asan/bin/btrfs+0x4213f8)

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /home/lukas/dev/btrfsfuzz/src-asan/./ctree.h:2136:1 in btrfs_qgroup_status_flags
==30530==ABORTING