Description of problem:

Panic in btrfs-endio-wri when checksum verify failed.  Issue discussed directly with code owner.

<josef> hrm bad checksums
<josef> shouldnt have paniced tho
<neb> before this happened. my machine which was doing an yum update from 5.5 to 5.6 on a disk that was on an external usb drive formatted with btrfs froze forcing me to hard power my system
<neb> no crash log from that
<neb> sorry
<neb> so the FS could have been very inconsistent
<josef> yeah thats probably why it crashed
<josef> so can you do the following
<josef> gdb <your btrfs.ko>
<josef> list *(read_extent_buffer+22)
<josef> oh heh i know what went wrong
<josef> i'll fix it
<neb> (gdb) list *(read_extent_buffer+22)
<neb> 0x42396 is in read_extent_buffer (fs/btrfs/extent_io.c:3485).
<neb> 3480  char *kaddr;
<neb> 3481  char *dst = (char *)dstv;
<neb> 3482  size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1);
<neb> 3483  unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT;
<neb> 3484 
<neb> 3485  WARN_ON(start > eb->len);
<neb> 3486  WARN_ON(start + len > eb->start + eb->len);
<neb> 3487 
<neb> 3488  offset = (start_offset + start) & ((unsigned long)PAGE_CACHE_SIZE - 1);
<neb> 3489 
<josef> thats what i thought
<josef> cool, i'll fix that up
<neb> thansk
<josef> np
<josef> actually one more thing
<josef> can you do
<josef> list *(btrfs_del_csums+0x1bf)
<josef> just so i know its where i think it is

(gdb)  list *(btrfs_del_csums+0x1bf)
0x19f8f is in btrfs_del_csums (fs/btrfs/ctree.h:1678).
1673	static inline void btrfs_disk_key_to_cpu(struct btrfs_key *cpu,
1674						 struct btrfs_disk_key *disk)
1675	{
1676		cpu->offset = le64_to_cpu(disk->offset);
1677		cpu->type = disk->type;
1678		cpu->objectid = le64_to_cpu(disk->objectid);
1679	}
1680	
1681	static inline void btrfs_cpu_key_to_disk(struct btrfs_disk_key *disk,
1682						 struct btrfs_key *cpu)

Version-Release number of selected component (if applicable):

kernel 2.6.32-71.14.1.el6.x86_64

  
Actual results:


Expected results:


Additional info:

Crash log http://pastebin.com/ZRQnK1Gp