It happened to me, is not usual, in fact was muy first time, in my case
it hanged forever, i was making a heavy use with nfs, ocal and lot of
paralel copy writes and it stucked. No problems with the disks, just
the process using 99% of cpu.
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Ok, thanks for changing the status, Colin.
:)
G
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Title:
ZFS I/O hangs for minutes
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This bug has been waiting for feedback for questions in comment #35 and
#36 for months. I'm going to mark this bug as Won't fix because of
limited responses. If this bug is still an issue, please re-open it.
** Changed in: zfs-linux (Ubuntu)
Status: Incomplete => Won't Fix
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Hello Karl-Philipp,
Thank you for submitting this bug and reporting a problem with the zfs-linux
package. You made this bug report in 2007 and there have been several versions
of Ubuntu since then.
Could you confirm that this is no longer a problem and that we can close the
ticket?
If it is
This stack trace is similar to one in
https://github.com/zfsonlinux/zfs/issues/2934 - the suspected issue is
that one of the devices is taking a long time to complete and ZFS is
blocked waiting for this.
I suggest installing sysstat
sudo apt install sysstat
and when the lockup happens run:
Found one in my Debian box logs:
Jun 11 10:02:37 workstation kernel: [238276.640617] INFO: task txg_sync:5936
blocked for more than 120 seconds.
Jun 11 10:02:37 workstation kernel: [238276.643806] Tainted: P
O 4.16.0-2-amd64 #1 Debian 4.16.12-
Jun 11 10:02:37 workstation
Hello Colin, nope.
It looks like ZFS has some sort of contention in waiting the ZIL to
finish the async callbacks from scheduled work, even when more spindles
exist. Not sure if its related to slab merging or getting the objects
from either slab/kmalloc or directly from page allocs. I think its a
@Rafael, did the workaround in comment #31 help?
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => Incomplete
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Title:
ZFS I/O hangs
You may possibly get some benefit from setting spl_kmem_cache_slab_limit
to zero as a module parameter for the spl ZoL kernel module. This avoids
SLUB slab merging entirely and maybe helpful from anecdotal evidence
I've seen.
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@Colin
1. its a really simple one since this is my devel machine: one ssd disk only
zpool: https://pastebin.ubuntu.com/p/gZPtrxRDnF/
hdparm: https://pastebin.ubuntu.com/p/JYyGwQ7cVr/
2. 8 x 4.0GHz AMD cores and 32GB RAM
meminfo: https://pastebin.ubuntu.com/p/kSjXSC6R3q/ (at the time of
@Rafael,
1. what is your ZFS configuration (number of drives?)
2. size of your system (total memory, free memory).
3. Do your drive(s) suffer from large I/O latencies?
- what is the output from iostat -mx
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Same issue (apparently) on upstream bug report tool:
https://github.com/zfsonlinux/zfs/issues/2611
https://github.com/zfsonlinux/zfs/issues/2523
https://github.com/zfsonlinux/zfs/issues/4011
https://github.com/zfsonlinux/zfs/issues/2934
** Bug watch added: Github Issue Tracker for ZFS #2611
Colin,
I'm afraid this is an ongoing issue. I have faced this in 4.4 and 4.13
kernels:
[ 240.568146] INFO: task txg_sync:2065 blocked for more than 120 seconds.
[ 240.568218] Tainted: P O4.4.0-116-generic #140-Ubuntu
[ 240.568268] "echo 0 >
** Changed in: zfs-linux (Ubuntu)
Status: Incomplete => Won't Fix
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Title:
ZFS I/O hangs for minutes
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Hi, if this is still and issue please let me know. I'm going to close
the bug if I don't get any response in 1 week.
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Title:
ZFS I/O hangs for
Is this still causing problems? Ive not heard any update on my question
in comment #24, so I was wondering if this bug is still an issue.
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** Changed in: zfs
Status: Unknown => Fix Released
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Title:
ZFS I/O hangs for minutes
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When this issue occurs again, can you run the following command:
iostat -mx
..and past the output into the bug. Thanks
** Bug watch added: Github Issue Tracker for ZFS #2934
https://github.com/zfsonlinux/zfs/issues/2934
** Also affects: zfs via
** Description changed:
I/O for multiple programs, like `thunderbird`, `firefox`, etc., hangs
- for minutes, `dmesg` contains
+ for minutes and approx. 100 `z_rd_int_[n]` and `z_wr_int_[n]` kernel
+ threads are created, `dmesg` contains
- [ 9184.451606] INFO: task txg_sync:11471 blocked
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: zfs-linux (Ubuntu)
Status: New => Confirmed
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Title:
** Package changed: linux (Ubuntu) => zfs-linux (Ubuntu)
** Changed in: zfs-linux (Ubuntu)
Status: Confirmed => New
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Title:
ZFS I/O
apport information
** Tags added: apport-collected
** Description changed:
I/O for multiple programs, like `thunderbird`, `firefox`, etc., hangs
for minutes, `dmesg` contains
[ 9184.451606] INFO: task txg_sync:11471 blocked for more than 120
seconds.
[ 9184.451610]
** Package changed: zfs-linux (Ubuntu) => linux (Ubuntu)
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Title:
ZFS I/O hangs for minutes
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