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Date: Tue, 10 May 2016 16:39:37 -0600
From: Ross Zwisler <ross.zwisler@...ux.intel.com>
To: Ross Zwisler <ross.zwisler@...ux.intel.com>,
Jan Kara <jack@...e.cz>, linux-fsdevel@...r.kernel.org,
linux-ext4@...r.kernel.org, linux-mm@...ck.org,
Dan Williams <dan.j.williams@...el.com>,
linux-nvdimm@...ts.01.org, Matthew Wilcox <willy@...ux.intel.com>
Subject: Re: [RFC v3] [PATCH 0/18] DAX page fault locking
On Tue, May 10, 2016 at 02:30:03PM -0600, Ross Zwisler wrote:
> On Tue, May 10, 2016 at 05:28:14PM +0200, Jan Kara wrote:
> > On Mon 09-05-16 11:38:28, Jan Kara wrote:
> > Somehow, I'm not able to reproduce the warnings... Anyway, I think I see
> > what's going on. Can you check whether the warning goes away when you
> > change the condition at the end of page_cache_tree_delete() to:
> >
> > if (!dax_mapping(mapping) && !workingset_node_pages(node) &&
> > list_empty(&node->private_list)) {
>
> Yep, this took care of both of the issues that I reported. I'll restart my
> testing with this in my baseline, but as of this fix I don't have any more
> open testing issues. :)
Well, looks like I spoke too soon. The two tests that were failing for me are
now passing, but I can still create what looks like a related failure using
XFS, DAX, and the two xfstests generic/231 and generic/232 run back-to-back.
Here's the shell:
# ./check generic/231 generic/232
FSTYP -- xfs (debug)
PLATFORM -- Linux/x86_64 alara 4.6.0-rc5jan_testing_2+
MKFS_OPTIONS -- -f -bsize=4096 /dev/pmem0p2
MOUNT_OPTIONS -- -o dax -o context=system_u:object_r:nfs_t:s0 /dev/pmem0p2 /mnt/xfstests_scratch
generic/231 88s ... 88s
generic/232 2s ..../check: line 543: 9105 Segmentation fault ./$seq > $tmp.rawout 2>&1
[failed, exit status 139] - output mismatch (see /root/xfstests/results//generic/232.out.bad)
--- tests/generic/232.out 2015-10-02 10:19:36.806795894 -0600
+++ /root/xfstests/results//generic/232.out.bad 2016-05-10 16:17:54.805637876 -0600
@@ -3,5 +3,3 @@
Testing fsstress
seed = S
-Comparing user usage
-Comparing group usage
...
(Run 'diff -u tests/generic/232.out /root/xfstests/results//generic/232.out.bad' to see the entire diff)
and the serial log:
run fstests generic/232 at 2016-05-10 16:17:53
XFS (pmem0p2): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
XFS (pmem0p2): Mounting V5 Filesystem
XFS (pmem0p2): Ending clean mount
XFS (pmem0p2): Quotacheck needed: Please wait.
XFS (pmem0p2): Quotacheck: Done.
------------[ cut here ]------------
kernel BUG at mm/workingset.c:423!
invalid opcode: 0000 [#1] SMP
Modules linked in: nd_pmem nd_btt nd_e820 libnvdimm
CPU: 1 PID: 9105 Comm: 232 Not tainted 4.6.0-rc5jan_testing_2+ #6
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.9.1-0-gb3ef39f-prebuilt.qemu-project.org 04/01/2014
task: ffff8801f4eb98c0 ti: ffff88040e5f0000 task.ti: ffff88040e5f0000
RIP: 0010:[<ffffffff81207b93>] [<ffffffff81207b93>] shadow_lru_isolate+0x183/0x1a0
RSP: 0018:ffff88040e5f3be8 EFLAGS: 00010006
RAX: ffff880401f68270 RBX: ffff880401f68260 RCX: ffff880401f68470
RDX: 000000000000006c RSI: 0000000000000000 RDI: ffff880410b2bd80
RBP: ffff88040e5f3c10 R08: 0000000000000008 R09: 0000000000000000
R10: ffff8800b59eb840 R11: 0000000000000080 R12: ffff880410b2bd80
R13: ffff8800b59eb828 R14: ffff8800b59eb810 R15: ffff880410b2bdc8
FS: 00007fb73c58c700(0000) GS:ffff88041a200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb73c5a4000 CR3: 000000040e139000 CR4: 00000000000006e0
Stack:
ffff880410b2bd80 ffff880410b2bdc8 ffff88040e5f3d18 ffff880410b2bdc8
ffff880401f68260 ffff88040e5f3c60 ffffffff81206c7f 0000000000000000
0000000000000000 ffffffff81207a10 ffff88040e5f3d10 0000000000000000
Call Trace:
[<ffffffff81206c7f>] __list_lru_walk_one.isra.3+0x9f/0x150 mm/list_lru.c:223
[<ffffffff81206d53>] list_lru_walk_one+0x23/0x30 mm/list_lru.c:263
[< inline >] list_lru_shrink_walk include/linux/list_lru.h:170
[<ffffffff81207bea>] scan_shadow_nodes+0x3a/0x50 mm/workingset.c:457
[< inline >] do_shrink_slab mm/vmscan.c:344
[<ffffffff811ea37e>] shrink_slab.part.40+0x1fe/0x420 mm/vmscan.c:442
[<ffffffff811ea5c9>] shrink_slab+0x29/0x30 mm/vmscan.c:406
[<ffffffff811ec831>] drop_slab_node+0x31/0x60 mm/vmscan.c:460
[<ffffffff811ec89f>] drop_slab+0x3f/0x70 mm/vmscan.c:471
[<ffffffff812d8c39>] drop_caches_sysctl_handler+0x69/0xb0 fs/drop_caches.c:58
[<ffffffff812f2937>] proc_sys_call_handler+0xe7/0x100 fs/proc/proc_sysctl.c:543
[<ffffffff812f2964>] proc_sys_write+0x14/0x20 fs/proc/proc_sysctl.c:561
[<ffffffff81269aa7>] __vfs_write+0x37/0x120 fs/read_write.c:529
[<ffffffff8126a3fc>] vfs_write+0xac/0x1a0 fs/read_write.c:578
[< inline >] SYSC_write fs/read_write.c:625
[<ffffffff8126b8d8>] SyS_write+0x58/0xd0 fs/read_write.c:617
[<ffffffff81a92a3c>] entry_SYSCALL_64_fastpath+0x1f/0xbd arch/x86/entry/entry_64.S:207
Code: 66 90 66 66 90 e8 4e 53 88 00 fa 66 66 90 66 66 90 e8 52 5c ef ff 4c 89 e7 e8 ba a1 88 00 89 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 0f 0b 66 66 66 66 66 66 2e
RIP [<ffffffff81207b93>] shadow_lru_isolate+0x183/0x1a0 mm/workingset.c:448
RSP <ffff88040e5f3be8>
---[ end trace c4ff9bc94605ec45 ]---
This was against a tree with your most recent fix. The full tree can be found
here:
https://git.kernel.org/cgit/linux/kernel/git/zwisler/linux.git/log/?h=jan_testing
This only recreates on about 1/2 of the runs of these tests in my system.
Thanks,
- Ross
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