Re: [Bug 192571] zswap + zram enabled BUG

[Alexandr <sss123next@list.ru>]

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D? D!N?, 18/01/2017 D2 10:39 +0900, Sergey Senozhatsky D?D,N?DuN?:
> Cc Dan
> 
> On (01/17/17 12:22), Andrew Morton wrote:
> > > https://bugzilla.kernel.org/show_bug.cgi?id=192571
> > > 
> > > --- Comment #1 from Gluzskiy Alexandr <sss123next@list.ru> ---
> > > [199961.576604] ------------[ cut here ]------------
> > > [199961.577830] kernel BUG at mm/zswap.c:1108!
> 
> zswap didn't manage to decompress the page:
> 
> static int zswap_frontswap_load(unsigned type, pgoff_t offset,
> 				struct page *page)
> {
> ...
> 	dst = kmap_atomic(page);
> 	tfm = *get_cpu_ptr(entry->pool->tfm);
> 	ret = crypto_comp_decompress(tfm, src, entry->length, dst,
> &dlen);
> 	put_cpu_ptr(entry->pool->tfm);
> 	kunmap_atomic(dst);
> 	zpool_unmap_handle(entry->pool->zpool, entry->handle);
> 	BUG_ON(ret);
> 	^^^^^^^^^^^
> 
> is there anything suspicious in dmesg?
> 
> 	-ss
> 
> [..]
> > > [199961.596459] Hardware name: System manufacturer System Product
> > > Name/M4A77TD,
> > > BIOS 2104A A A A 06/28/2010
> > > [199961.597974] task: ffff880035c19680 task.stack:
> > > ffffc90000510000
> > > [199961.599490] RIP:
> > > 0010:[<ffffffff8112c6c2>]A A [<ffffffff8112c6c2>]
> > > zswap_frontswap_load+0x142/0x160
> > > [199961.601042] RSP: 0000:ffffc90000513cb0A A EFLAGS: 00010282
> > > [199961.602588] RAX: ffffffff818263a0 RBX: ffff88036b2fb930 RCX:
> > > ffffc90000513c98
> > > [199961.604141] RDX: ffff8801a75da000 RSI: ffff8802ee9d0240 RDI:
> > > ffff88041c25d000
> > > [199961.605687] RBP: ffff880035c19680 R08: ffff8802ee9d0249 R09:
> > > ffff8801a75da0ac
> > > [199961.607240] R10: ffff8801a75db000 R11: ffff8802ee9d027d R12:
> > > 00000000ffffffea
> > > [199961.608788] R13: ffff8804176e3830 R14: ffff8804176e3838 R15:
> > > 000000c42a6ac008
> > > [199961.610315] FS:A A 00007fe1fa7fc700(0000)
> > > GS:ffff88042fc80000(0000)
> > > knlGS:0000000000000000
> > > [199961.611838] CS:A A 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [199961.613357] CR2: 000000c42a6ac008 CR3: 00000000a8411000 CR4:
> > > 00000000000006e0
> > > [199961.614864] Stack:
> > > [199961.616327]A A 00001000fffffffe ffffffff81823780
> > > 000000000014487b
> > > ffffea00069d7680
> > > [199961.617820]A A 0000000000000001 ffff880418614c00
> > > ffffffff8112b768
> > > ffffea00069d7680
> > > [199961.619310]A A ffff880418614c00 000000000014487b
> > > 00000000024200ca
> > > ffff88011d834900
> > > [199961.620799] Call Trace:
> > > [199961.622250]A A [<ffffffff8112b768>] ?
> > > __frontswap_load+0x68/0xc0
> > > [199961.623689]A A [<ffffffff8112666c>] ? swap_readpage+0x8c/0x120
> > > [199961.625115]A A [<ffffffff81126e61>] ?
> > > read_swap_cache_async+0x21/0x40
> > > [199961.626545]A A [<ffffffff81126f96>] ?
> > > swapin_readahead+0x116/0x1e0
> > > [199961.627973]A A [<ffffffff812b704e>] ?
> > > radix_tree_lookup_slot+0xe/0x20
> > > [199961.629398]A A [<ffffffff8111236f>] ? do_swap_page+0x42f/0x660
> > > [199961.630799]A A [<ffffffff81114bca>] ?
> > > handle_mm_fault+0x76a/0x1080
> > > [199961.632163]A A [<ffffffff811544ec>] ? new_sync_read+0xac/0xe0
> > > [199961.633496]A A [<ffffffff8102c7a9>] ?
> > > __do_page_fault+0x169/0x3e0
> > > [199961.634798]A A [<ffffffff8102ca5b>] ? do_page_fault+0x1b/0x60
> > > [199961.636106]A A [<ffffffff810e3cc9>] ?
> > > __context_tracking_exit.part.1+0x49/0x60
> > > [199961.637424]A A [<ffffffff8157c7cf>] ? page_fault+0x1f/0x30
> > > [199961.638739] Code: fb ff ff 41 c6 45 08 00 48 83 c4 08 44 89
> > > e0 5b 5d 41 5c
> > > 41 5d 41 5e c3 be 0f 00 00 00 48 c7 c7 12 d6 6d 81 e8 e0 d2 f1 ff
> > > eb b0 <0f> 0b
> > > 0f 1f 84 00 00 00 00 00 66 2e 0f 1f 84 00 00 00 00 00 66A 
> > > [199961.641538] RIPA A [<ffffffff8112c6c2>]
> > > zswap_frontswap_load+0x142/0x160
> > > [199961.642922]A A RSP <ffffc90000513cb0>
> > > [199961.648971] ---[ end trace 76742a0cd4818a78 ]---

no, nothing interesting in dmesg. but i suspect what it may be because
of usage zram and zswap together.
i have following configuration:
1. boot option to kernel "ro radeon.audio=0 dma_debug=off reboot=warm
gbpages rootfstype=ext4
rootflags=relatime,user_xattr,journal_async_commit,delalloc,nobarrier
zswap.enabled=1"
2. zram activation in userspace:
"
cat /etc/local.d/zram.startA 
#!/bin/sh

modprobe zram
echo 10G > /sys/block/zram0/disksize
mkswap /dev/zram0
swapon --priority 200 /dev/zram0
"

3. also i have normal swap block device as fall back if all memory used
"
swapon
NAMEA A A A A A A A A A A A A TYPEA A A A A A SIZE USED PRIO
/dev/mapper/swap partitionA A 16GA A A 0BA A A A 0
/dev/zram0A A A A A A A partitionA A 10GA A A 1GA A 200
"

so, maybe problem related to zswap on zram ? just a guess...
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