文件系统位于 LVM RAID5 上。它似乎工作正常：
$ sudo pvs
[sudo] password for jrwren:
PV VG Fmt Attr PSize PFree
/dev/sda2 datavg lvm2 a-- <7.28t 2.80t
/dev/sdb2 datavg lvm2 a-- <3.64t 0
/dev/sdc2 datavg lvm2 a-- <7.28t <7.28t
/dev/sdd2 datavg lvm2 a-- <7.28t 0
/dev/sde2 datavg lvm2 a-- <7.28t 73.82g
/dev/sdf1 datavg lvm2 a-- <3.64t 0
/dev/sdg2 datavg lvm2 a-- <7.28t 3.99t
/dev/sdh2 datavg lvm2 a-- <447.11g 8.00m
/dev/sdi2 datavg lvm2 a-- <9.10t 2.21t
$ sudo lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
lxd2 datavg -wi-ao---- 147.10g
mirrored datavg -wi-ao---- 300.00g
m datavg Rwi-aor--- 3.52t 100.00
m3 datavg Rwi-aor--- 4.00t 100.00
mu datavg Rwi-aor--- 1.00t 100.00
nomirror datavg -wi-ao---- 2.20t
photos datavg Rwi-aor--- 200.00g 100.00
stor datavg Rwi-aor--- 300.00g 100.00
storj datavg -wi-ao---- 1.00t
t datavg Rwi-aor--- 6.00t 100.00
t2 datavg Rwi-aor--- 3.90t 100.00
我有一个进程对名为 m 的逻辑卷进行多次读取。这是设备 dm-12。最终，它会随着以下内核消息而死。
Jun 30 16:02:33 delays kernel: [393661.035286] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: com[68/1946]t main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.039726] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.044175] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.048584] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.054717] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.060977] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.063736] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.066283] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.068773] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:02:33 delays kernel: [393661.071232] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365192: comm rtorrent main: pblk 765519712 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
我卸载文件系统并运行 e2fsck：
$ sudo e2fsck -p /dev/datavg/m
movies contains a file system with errors, check forced.
movies: Inode 118751237 has an invalid extent node (blk 475078659, lblk 0)
movies: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
(i.e., without -a or -p options)
$ sudo e2fsck -y /dev/datavg/movies
e2fsck 1.45.7 (28-Jan-2021)
movies contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Inode 177471496 has an invalid extent node (blk 709943175, lblk 0)
Clear? yes
...
Pass 1E: Optimizing extent trees
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences: -(709943175--709943176) -(868210688--868212735) -(868214784--868216831) -(868253696--868255743) -(868257792--868259839) -(868886528--868888575) -(868892672--868894719) -(868896768--868898815) -(868900864--868902911) -(868904960--868907007) -(868909056--868911103) -(868913152--868917247) -(868921344--868923391) -(868925440--868927487) -(868929536--868931583) -(868933632--868935679) -(868937728--868939775) -(868941824--868943871) -(868945920--868947967) -(868950016--868954111) -(868958208--868960013) -(869894144--869922573)
Fix? yes
Free blocks count wrong for group #21665 (24561, counted=24563).
Fix? yes
Free blocks count wrong for group #26495 (28672, counted=32768).
Fix? yes
Free blocks count wrong for group #26497 (18432, counted=22528).
Fix? yes
Free blocks count wrong for group #26516 (22528, counted=32768).
Fix? yes
Free blocks count wrong for group #26517 (16384, counted=32768).
Fix? yes
Free blocks count wrong for group #26518 (16626, counted=26624).
Fix? yes
Free blocks count wrong for group #26547 (2290, counted=30720).
Fix? yes
Free blocks count wrong (366951912, counted=367025158).
Fix? yes
movies: ***** FILE SYSTEM WAS MODIFIED *****
movies: 6896/236224512 files (20.8% non-contiguous), 577868794/944893952 blocks
$ sudo e2fsck -p /dev/datavg/movies
movies: clean, 6896/236224512 files, 577868794/944893952 blocks
它说它很干净，所以我重新安装它并重新运行阅读软件。
几分钟后：
Jun 30 16:34:49 delays kernel: [395595.309814] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:34:49 delays kernel: [395595.317838] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:34:49 delays kernel: [395595.320836] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:34:49 delays kernel: [395595.323418] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:35:14 delays kernel: [395619.785771] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
Jun 30 16:35:14 delays kernel: [395619.793135] EXT4-fs error (device dm-12): ext4_find_extent:885: inode #191365190: comm rtorrent main: pblk 765517692 bad header/extent: invalid magic - magic 0, entries 0, max 0(0), depth 0(0)
这里发生了什么？LVM 是否腐败并在欺骗我？有没有我可以运行检查的命令？我应该运行一个坏块（e2fsck -c）还是什么？
内核没有相应的 LVM 消息。如果底层磁盘有问题，我预计会出现 LVM 错误。到底是怎么回事？
更新：有人要求 dmesg 输出。这正是上面 EXT4-fs 消息的内容。dmesg 输出中除了标准引导消息之外的唯一其他消息是重复的：
[527724.593062] rptaddrs[3948921]: segfault at 7ffc7a7a50b5 ip 00007fd9f0f86820 sp 00007ffc7a7a3fc8 error 4 in libc-2.28.so[7fd9f0e4c000+148000] [527724.593075] Code: 7f 07 c5 fe 7f 4f 20 c5 fe 7f 54 17 e0 c5 fe 7f 5c 17 c0 c5 f8 77 c3 48 39 f7 0f 87 ab 00 00 00 0f 84 e5 fe ff ff c5 fe 6f 26 <c5> fe 6f 6c 16 e0 c5 fe 6f 74 16 c0 c5 fe 6f 7c 16 a0 c5 7e 6f 44
