** Description changed:
- $ cat /proc/version_signature
+ [Impact]
+
+ bcache_allocator() can call the following:
+
+ bch_allocator_thread()
+ -> bch_prio_write()
+ -> bch_bucket_alloc()
+ -> wait on >set->bucket_wait
+
+ But the wake up event on bucket_wait is
** Tags added: cscc
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Title:
mkfs.ext4 over /dev/bcache0 hangs
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** This bug is no longer a duplicate of bug 1796292
Tight timeout for bcache removal causes spurious failures
** Changed in: linux (Ubuntu Bionic)
Assignee: (unassigned) => Andrea Righi (arighi)
** Changed in: linux (Ubuntu Cosmic)
Assignee: (unassigned) => Andrea Righi (arighi)
**
*** This bug is a duplicate of bug 1796292 ***
https://bugs.launchpad.net/bugs/1796292
** This bug has been marked a duplicate of bug 1796292
Tight timeout for bcache removal causes spurious failures
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Possibly a duplicate of bug 1796292, since we've got the same hung task
timeout trace in bch_bucket_alloc() with the latest test kernel
(4.15.0-55-generic #60+lp796292).
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** Changed in: linux (Ubuntu)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu Bionic)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu Cosmic)
Status: In Progress => Confirmed
** Changed in: linux (Ubuntu Cosmic)
Assignee: Joseph Salisbury
v4.13 shows the same search_free stack as 4.14, but doesn't appear to be
fatal (it doesn't result in a hung process nor a block device that
cannot be wiped.
I suspect we've got a new upstream issue since 4.20 didn't fix things.
Re-running 4.20 to see if we had a stack trace, we don't NULL pointer
I also tested v4.15-rc5, which failed with the same stack trace. Then I
returned to 4.14 mainline, and got this one:
[ 953.659489] BUG: unable to handle kernel NULL pointer dereference at
0d40
[ 953.668707] IP:
It took a while, but v4.15-rc6 fails; so we need to move back a bit.
[ 2541.139904] bcache: bcache_device_free() bcache0 stopped
[ 2541.141848] BUG: unable to handle kernel NULL pointer dereference
at 0d38
[ 2541.143813] IP: search_free+0ex01-b6435-e1/5f0x40 [bcache]
[ 2541.145676]
Can you confirm that v4.15-rc6 does not exhibit the bug? That will
ensure I'm reviewing the correct commits:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc6/
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The 4.15.0-39 kernel FAILs:
+ make-bcache -C /dev/sdb
Can't open dev /dev/sdb: Device or resource busy
+ exit 1
Successful runs: 24
root@ubuntu:~# [ 242.655013] INFO: task kworker/3:103:2610 blocked for more
than 120 seconds.
[ 242.665486] Not tainted 4.15.0-39-generic #43~lp1784665
[
I built a new Bionic test kernel. The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test this kernel and see if it resolves this bug?
Note about installing test kernels:
• If the test kernel is prior to 4.15(Bionic) you need to install the
4.20-rc3 also fails.
Successful runs: 95
root@ubuntu:~# [ 484.565298] INFO: task kworker/3:206:2091 blocked for more
than 120 seconds.
[ 484.566976] Not tainted 4.20.0-042000rc3-generic #201811182231
[ 484.568069] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
The 4.20 kernel is now available. Can you give v4.20-rc3 a test:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.20-rc3
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Title:
mkfs.ext4
** Tags removed: kernel-key
** Tags added: kernel-da-key
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To manage notifications about this bug go
Thanks for testing. I was hoping a fix would be in 4.19, but I'll dig
some more.
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To manage
On Wed, Aug 29, 2018 at 12:01 PM Joseph Salisbury
wrote:
>
> Thanks for digging up this additional information. I'll investigate
> further. While I do that, the v4.19-rc1 kernel is now out. It might be
> worthwhile to give that one a go, and see if the fix was already
> committed to mainline:
Thanks for digging up this additional information. I'll investigate
further. While I do that, the v4.19-rc1 kernel is now out. It might be
worthwhile to give that one a go, and see if the fix was already
committed to mainline:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.19-rc1/
--
You
https://www.spinics.net/lists/linux-bcache/msg04869.html
https://www.spinics.net/lists/linux-bcache/msg05774.html
On Tue, Aug 28, 2018 at 2:30 PM Ryan Harper wrote:
>
> It's always been a locking issue, so either misuse (or missing) locks
> in the bcache attach/detach path, or generic locking
It's always been a locking issue, so either misuse (or missing) locks
in the bcache attach/detach path, or generic locking changes to block
layer path I'd think.
I'll see if I can find any hits on those oops tracebacks too
On Tue, Aug 28, 2018 at 2:29 PM Ryan Harper wrote:
>
>
https://patchwork.kernel.org/patch/10094201/
diff --git a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
b/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
index d4f80786e7c2..3890468678ce 100644
--- a/arch/arm64/boot/dts/rockchip/rk3328-rock64.dts
+++
The bisect reported the following commit as the first bad commit:
bc631943faba ("arm64: dts: rockchip: limit rk3328-rock64 gmac speed to
100MBit for now")
It's strange that this is an arm64 commit. I'll investigate a bit and
see why the bisect came back with this result.
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FAILED: Kernel 4.15-rc1 up to bc631943faba6fc3f755748091ada31798fb7d50
Attached is the oops of the failure.
** Attachment added: "rc1-bisect7-oops.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5181823/+files/rc1-bisect7-oops.txt
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I built the next test kernel, up to the following commit:
bc631943faba6fc3f755748091ada31798fb7d50
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
PASS: Kernel 4.15-rc1 (bisect6) up to
87eba0716011e528f7841026f2cc65683219d0ad
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To manage
I built the next test kernel, up to the following commit:
87eba0716011e528f7841026f2cc65683219d0ad
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
PASS: Kernel 4.15-rc1 (bisect5) up to
6b457409169b7686d293b408da0b6446ccb57a76
I've 2600 seconds of uptime with over 800 loops in the test-case.
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I built the next test kernel, up to the following commit:
6b457409169b7686d293b408da0b6446ccb57a76
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
FAILED: Kernel 4.15-rc1 up to f48f66a962a54c3d26d688c3df5441c9d1ba8730
Attached is the oops of the failure.
** Attachment added: "rc1-bisect4-oops.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5181417/+files/rc1-bisect4-oops.txt
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You received this bug
I built the next test kernel, up to the following commit:
f48f66a962a54c3d26d688c3df5441c9d1ba8730
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
FAILED: Kernel 4.15-rc1 up to f17b9e764dfcd838dab51572d620a371c05a8e60
Attached is the oops of the failure.
** Attachment added: "rc1-bisect3-ops.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5178807/+files/rc1-bisect3-ops.txt
--
You received this bug
I built the next test kernel, up to the following commit:
f17b9e764dfcd838dab51572d620a371c05a8e60
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
test kernel 4.15-rc1 up to abb62c46d4949d44979fa647740feff3f7538799
FAILED
** Attachment added: "kernel oops for 4.15-rc1 up to
abb62c46d4949d44979fa647740feff3f7538799"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5175947/+files/rc1-bisect2-oops.txt
--
You
I built the next test kernel, up to the following commit:
abb62c46d4949d44979fa647740feff3f7538799
The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1784665
Can you test that kernel and report back if it has the bug or not? I
will build the next test kernel based on
test kernel 4.15-rc6 up to d8887f1c7289848e74c92bd4322789a9cd7de699
FAILED
** Attachment added: "kernel oops for
4.15-rc6-up-to-d8887f1c7289848e74c92bd4322789a9cd7de699"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5175379/+files/rc6-bisect1-oops.txt
--
You
test kernel 4.15-rc6 up to d8887f1c7289848e74c92bd4322789a9cd7de699
FAILED
Attaching oops.
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To manage
I started a kernel bisect between v4.15-rc6 and v4.15-rc7. The kernel
bisect will require testing of about 7-10 test kernels.
I built the first test kernel, up to the following commit:
d8887f1c7289848e74c92bd4322789a9cd7de699
The test kernel can be downloaded from:
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => In Progress
** Changed in: linux (Ubuntu Cosmic)
Status: Confirmed => In Progress
** Changed in: linux (Ubuntu Bionic)
Importance: Undecided =>
4.14 Final: OK
4.15-rc1:OK
I started a further bisect:
4.15-rc9:FAIL
4.15-rc5:OK
4.15-rc7:FAIL
4.15-rc6:OK
So, it appears something between rc6 (last known good) and rc7 (FAIL)
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To narrow it down further, can you test the following two kernels:
4.14 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.14/
4.15-rc1: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.15-rc1/
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4.10:
Status: OK
Comment: Survived 30 minute loop over recreating with no issues.
4.13:
Status: OK
Comment: Survived 30 minute loop over recreating with no issues.
4.15:
Status: FAIL
Comment: triggered within less than a minute of the loop.
Kernel Trace:
[ 122.500943] Oops:
Thanks for testing mainline. We should be able to bisect this down if
we confirm it's a regression.
Can you test the following kernels and report back? We are looking for
the first kernel version that exhibits this bug:
4.10 Final: http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.10/
4.13
I can recreate on upstream:
# uname -r; dmesg | tail -n 16
4.18.0-041800rc7-generic
[ 967.657492] INFO: task bcache_allocato:14240 blocked for more than 120
seconds.
[ 967.664138] Not tainted 4.18.0-041800rc7-generic #201807292230
[ 967.669641] "echo 0 >
I'll see if I can reproduce on the mainline kernel.
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To manage notifications about this bug go to:
I think I've got one. It doesn't always hang the mkfs, but it does
wedge bcache in a few ways.
[ 484.322546] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 484.326230] INFO: task bcache_allocato:32503 blocked for more than 120
seconds.
1) when it occurs, a
** Attachment added: "bcache-basic-repro.sh"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1784665/+attachment/5170528/+files/bcache-basic-repro.sh
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It would be great if we can identify a reproducer. It would make it
much easier to track down.
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Title:
mkfs.ext4 over /dev/bcache0 hangs
To
We've just had a second occurrence of this, same kernel, but with
Xenial. (Xenial HWE Edge kernel 4.15.0-29) with the same scenario,
mkfs.ext4 a /dev/bcache0.
I'll see if I can recreate by stressing things.
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> Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
We've had plenty of successful runs on this kernel. I suspect io load
or something else may trigger this. We've only seen it once out of tens
of not
Did this issue start happening after an update/upgrade? Was there a
prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v4.18
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