KDL from IMAP connection worker: unhandled page fault in kernel space

[jmairboeck]

This is hrev53709 on x86_64

I just got a KDL from IMAP connection worker. I have configured my Gmail account in Mail, which is rather big (~100k mails in the "All Mail" folder). mail_deamon was currently syncing mails (which it doesn't really do reliably for me, but that's a different problem ...)

I got this once already before in the last few weeks but it is not easily reproducible, I think.

[jmairboeck]

KDL screenshot

[X512]

Does file system contains errors? File system can be checked by checkfs -c /boot. Replace /boot with your volume path is needed.

[jmairboeck]

Replying to X512:

Does file system contains errors? File system can be checked by checkfs -c /boot. Replace /boot with your volume path is needed.

This is the output:

(dir has no name) (inode = 1637898), could not be opened
        756024 nodes checked,
        0 blocks not allocated,
        0 blocks already set,
        23925 blocks could be freed

        files           718563
        directories     36354
        attributes      692
        attr. dirs      370
        indices         45

        direct block runs               767060 (14.96 GiB)
        indirect block runs             8651 (in 210 array blocks, 3.82 GiB)
        double indirect block runs      6909 (in 12 array blocks, 26.99 MiB)

Except maybe for the first line, this doesn't look suspicious to me.

[waddlesplash]

Actually:

23925 blocks could be freed

This is pretty suspicious, it means that there were blocks that were not really allocated for anything.

(dir has no name) (inode = 1637898), could not be opened

This may be why; there was a directory that was for some reason corrupt, and so it was probably removed and anything in it "freed".

We should try to avoid KDLs though.

[waddlesplash]

Has this been seen since?

[jmairboeck]

I don't think so. A few weeks ago, I ran checkfs on that disk and it was clean. I reinstalled the system since I reported this ticket though.