Re: [BUG] on mount with reiser4-for-4.8

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A deep dive to the page allocator is needed to find
out why the warning (not simply regular ENOMEM).

Edward.

On 01/06/2017 05:37 PM, Dušan Čolić wrote:
On Sun, Dec 25, 2016 at 4:32 PM, Dušan Čolić <dusanc@xxxxxxxxx> wrote:
On Sat, Dec 24, 2016 at 9:48 AM, Dušan Čolić <dusanc@xxxxxxxxx> wrote:
On Sun, Dec 18, 2016 at 2:46 PM, Dušan Čolić <dusanc@xxxxxxxxx> wrote:
That was it, no more BUG on mount.

I spoke prematurely.

Looks like I had 2 different BUGs on mount:
1. BUG when mounting partition with old disk format - that was solved
with 4.8.1 patch
2. BUG when mounting dismounted partition - this one is not solved

When I I get this BUG I do:
echo 1 > /proc/sys/vm/drop_caches

and everything works OK again.

With echo 1 > /proc/sys/vm/drop_caches added before mount to scripts
that I run daily on R4 partitions I had no occurence of this bug and
before I had it every day.


When partitions are mounted on boot they mount OK, but when system
finishes booting when I try to mount them I get this BUG:


Dec 24 09:41:21 krshina3 kernel: reiser4: md127: found disk format 4.0.1.
Dec 24 09:41:21 krshina3 kernel: mount: page allocation failure:
order:5, mode:0x26040c0(GFP_KERNEL|__GFP_COMP|__GFP_NOTRACK)
Dec 24 09:41:21 krshina3 kernel: CPU: 0 PID: 3859 Comm: mount Not
tainted 4.8.11-gentoo #5
Dec 24 09:41:21 krshina3 kernel: Hardware name: Gigabyte Technology
Co., Ltd. To be filled by O.E.M./B75-D3V, BIOS F5 07/04/2012
Dec 24 09:41:21 krshina3 kernel:  0000000000400000 ffff88007d0379b0
ffffffff814241c5 0000000000000005
Dec 24 09:41:21 krshina3 kernel:  0000000000000000 ffff88007d037a40
ffffffff811ab42a 026040c07d0379f0
Dec 24 09:41:21 krshina3 kernel:  0000000000000202 0000000000000004
00000040026040c0 ffff88007d037ad0
Dec 24 09:41:21 krshina3 kernel: Call Trace:
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff814241c5>] dump_stack+0x4d/0x68
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff811ab42a>]
warn_alloc_failed+0xba/0x160
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff811aa483>] ?
get_page_from_freelist+0x143/0xcf0
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff811ab863>]
__alloc_pages_nodemask+0x2f3/0xd40
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff810ca0d8>] ?
kmemcheck_pte_lookup+0x28/0x60
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff811fc28d>]
cache_alloc_refill+0xed/0x6a0
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff811fc189>]
kmem_cache_alloc+0xf9/0x110
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812a060f>]
znodes_tree_init+0x5f/0x210
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812ac8ee>]
reiser4_init_tree+0x8e/0x150
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81304a55>]
init_format_format40+0x345/0x790
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81229aa4>] ?
unlock_new_inode+0x64/0xa0
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812c4df0>] ? reiser4_mount+0x20/0x20
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812337f1>] ?
copy_mount_options+0x111/0x220
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff812337da>] ?
copy_mount_options+0xfa/0x220
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
Dec 24 09:41:21 krshina3 kernel:  [<ffffffff81a5765b>]
entry_SYSCALL_64_fastpath+0x13/0x8f
Dec 24 09:41:21 krshina3 kernel: Mem-Info:
Dec 24 09:41:21 krshina3 kernel: active_anon:453454
inactive_anon:113498 isolated_anon:0\x0a active_file:189238
inactive_file:800785 isolated_file:0\x0a unevictable:1866 dirty:1092
writeback:0 unstable:0\x0a slab_reclaimable:55782
slab_unreclaimable:60397\x0a mapped:20308 shmem:11803 pagetables:2738
bounce:0\x0a free:13271 free_pcp:0 free_cma:0
Dec 24 09:41:21 krshina3 kernel: Node 0 active_anon:1813816kB
inactive_anon:453992kB active_file:756952kB inactive_file:3203140kB
unevictable:7464kB isolated(anon):0kB isolated(file):0kB
mapped:81232kB dirty:4368kB writeback:0kB shmem:47212kB
writeback_tmp:0kB unstable:0kB pages_scanned:0 all_unreclaimable? no
Dec 24 09:41:21 krshina3 kernel: DMA free:15896kB min:24kB low:36kB
high:48kB active_anon:0kB inactive_anon:0kB active_file:0kB
inactive_file:0kB unevictable:0kB writepending:0kB present:15984kB
managed:15900kB mlocked:0kB slab_reclaimable:0kB
slab_unreclaimable:4kB kernel_stack:0kB pagetables:0kB bounce:0kB
free_pcp:0kB local_pcp:0kB free_cma:0kB
Dec 24 09:41:21 krshina3 kernel: lowmem_reserve[]: 0 3191 6627 6627
Dec 24 09:41:21 krshina3 kernel: DMA32 free:22044kB min:5012kB
low:8280kB high:11548kB active_anon:810196kB inactive_anon:351420kB
active_file:172284kB inactive_file:1693924kB unevictable:0kB
writepending:2036kB present:3360704kB managed:3272764kB mlocked:0kB
slab_reclaimable:85100kB slab_unreclaimable:120576kB
kernel_stack:416kB pagetables:3108kB bounce:0kB free_pcp:0kB
local_pcp:0kB free_cma:0kB
Dec 24 09:41:21 krshina3 kernel: lowmem_reserve[]: 0 0 3435 3435
Dec 24 09:41:21 krshina3 kernel: Normal free:15144kB min:5392kB
low:8908kB high:12424kB active_anon:1003620kB inactive_anon:102572kB
active_file:584668kB inactive_file:1509216kB unevictable:7464kB
writepending:2332kB present:4691968kB managed:3517764kB mlocked:7464kB
slab_reclaimable:138028kB slab_unreclaimable:121008kB
kernel_stack:4608kB pagetables:7844kB bounce:0kB free_pcp:0kB
local_pcp:0kB free_cma:0kB
Dec 24 09:41:21 krshina3 kernel: lowmem_reserve[]: 0 0 0 0
Dec 24 09:41:21 krshina3 kernel: DMA: 2*4kB (U) 0*8kB 1*16kB (U)
0*32kB 2*64kB (U) 1*128kB (U) 1*256kB (U) 0*512kB 1*1024kB (U)
1*2048kB (M) 3*4096kB (M) = 15896kB
Dec 24 09:41:21 krshina3 kernel: DMA32: 909*4kB (M) 662*8kB (ME)
313*16kB (UME) 176*32kB (UME) 39*64kB (ME) 0*128kB 0*256kB 0*512kB
0*1024kB 0*2048kB 0*4096kB = 22068kB
Dec 24 09:41:21 krshina3 kernel: Normal: 1493*4kB (UM) 397*8kB (UME)
375*16kB (UME) 1*32kB (E) 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB
0*2048kB 0*4096kB = 15180kB
Dec 24 09:41:21 krshina3 kernel: Node 0 hugepages_total=0
hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
Dec 24 09:41:21 krshina3 kernel: 1003306 total pagecache pages
Dec 24 09:41:21 krshina3 kernel: 0 pages in swap cache
Dec 24 09:41:21 krshina3 kernel: Swap cache stats: add 0, delete 0, find 0/0
Dec 24 09:41:21 krshina3 kernel: Free swap  = 9775420kB
Dec 24 09:41:21 krshina3 kernel: Total swap = 9775420kB
Dec 24 09:41:21 krshina3 kernel: 2017164 pages RAM
Dec 24 09:41:21 krshina3 kernel: 0 pages HighMem/MovableOnly
Dec 24 09:41:21 krshina3 kernel: 315557 pages reserved



Thanks a lot

Dushan

On Sun, Dec 18, 2016 at 1:44 PM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
Try this one in addition.

Thanks,
Edward.


On 12/18/2016 01:17 PM, Dušan Čolić wrote:
It's OK now, mounts read-only on error.

What about that BUG on mount?

On Sat, Dec 17, 2016 at 10:45 PM, Edward Shishkin
<edward.shishkin@xxxxxxxxx> wrote:
Please, check if this help.
Apply from reiser4 directory.

Thanks,
Edward.


On 12/17/2016 10:08 PM, Dušan Čolić wrote:
When mounting reiser4 partitions I get the following bug, but the
system keeps working, even as reiser4 remounted partition as read
only.

All R4 partitions are ccreg40.

Thanks

Dushan

    cat /etc/fstab | grep -v "#"


/dev/sda1        /boot        ext2        noauto,noatime    1 2
/dev/md123              none            swap            sw
0
0
/dev/sda2        /        reiser4        noatime,onerror=remount-ro
0 0
/dev/md125        /mnt/backup    reiser4
noatime,noauto,onerror=remount-ro    0 0
/dev/md126        /mnt/media    reiser4
noatime,users,onerror=remount-ro    0 0
/dev/md127        /usr/portage    reiser4
noatime,onerror=remount-ro        0 0
/dev/dvdrom        /mnt/cdrom    auto        noauto,ro    0 0
shm            /dev/shm    tmpfs        nodev,nosuid,noexec    0 0


cat /proc/mdstat
Personalities : [raid1]
md122 : active raid1 sdc1[1] sdb1[0]
         104320 blocks [2/2] [UU]

md123 : active raid1 sdc2[1] sdb2[0]
         594304 blocks [2/2] [UU]

md124 : active raid1 sdc5[1] sdb5[0]
         9775424 blocks [2/2] [UU]

md125 : active raid1 sdc6[1] sdb6[0]
         68364480 blocks [2/2] [UU]

md126 : active raid1 sdc7[1] sdb7[0]
         403110912 blocks [2/2] [UU]

md127 : active raid1 sdc8[1] sdb8[0]
         6433920 blocks [2/2] [UU]

    df

Filesystem     1K-blocks      Used Available Use% Mounted on
/dev/sda2       37017728  30413152   6604576  83% /
tmpfs             680644      1012    679632   1% /run
dev                10240         0     10240   0% /dev
shm              3403212      1284   3401928   1% /dev/shm
cgroup_root        10240         0     10240   0% /sys/fs/cgroup
/dev/md126     383034100 350741596  32292504  92% /mnt/media
/dev/md127       6113484   5605344    508140  92% /usr/portage
none             3403212        12   3403200   1% /run/user/1001
none             3403212         0   3403212   0% /run/user/1000
/dev/md125      64959612  52568760  12390852  81% /mnt/backup


dmesg

[    2.057469] reiser4[swapper/0(1)]: try_init_format40
(fs/reiser4/plugin/disk_format/disk_format40.c:303)[vpf-1364]:
                  NOTICE: Warning: mounting sda2 with fatal errors,
forcing read-only mount.
[    2.060544] reiser4: sda2: found disk format 4.0.1.
[    2.062410]
==================================================================
[    2.063993] BUG: KASAN: use-after-free in
init_format_format40+0x401/0x750 at addr ffff8801d0fc0850
[    2.065616] Read of size 4 by task swapper/0/1
[    2.067228] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.8.11-gentoo
#3
[    2.068857] Hardware name: Gigabyte Technology Co., Ltd. To be
filled by O.E.M./B75-D3V, BIOS F5 07/04/2012
[    2.070566]  ffff8801d08f4580 ffff8801d6327a20 ffffffff81424185
ffff8801d6000600
[    2.072316]  ffff8801d0fc0800 ffff8801d6327a48 ffffffff811ff90c
ffff8801d6327ad8
[    2.074078]  ffff8801d0fc0800 ffff8801d0fc0800 ffff8801d6327ac8
ffffffff811ffb79
[    2.075861] Call Trace:
[    2.077616]  [<ffffffff81424185>] dump_stack+0x4d/0x68
[    2.079402]  [<ffffffff811ff90c>] kasan_object_err+0x1c/0x70
[    2.081216]  [<ffffffff811ffb79>] kasan_report_error+0x1c9/0x4b0
[    2.083049]  [<ffffffff812a10cf>] ? zget+0xdf/0x3c0
[    2.084876]  [<ffffffff811ffef4>] kasan_report+0x34/0x40
[    2.086717]  [<ffffffff81304b11>] ? init_format_format40+0x401/0x750
[    2.088594]  [<ffffffff811ff601>] __asan_load4+0x61/0x80
[    2.090471]  [<ffffffff81304b11>] init_format_format40+0x401/0x750
[    2.092356]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    2.094224]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    2.096073]  [<ffffffff812c4df0>] ? reiser4_mount+0x20/0x20
[    2.097930]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    2.099785]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    2.101654]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    2.103528]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    2.105397]  [<ffffffff811fe944>] ? kasan_check_write+0x14/0x20
[    2.107295]  [<ffffffff811c4624>] ? strndup_user+0x54/0x70
[    2.109187]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    2.111089]  [<ffffffff820a8759>] mount_block_root+0x171/0x3ac
[    2.113023]  [<ffffffff820a8a0b>] mount_root+0x77/0xd8
[    2.114955]  [<ffffffff820a8ba1>] prepare_namespace+0x135/0x16d
[    2.116887]  [<ffffffff820a84ec>] kernel_init_freeable+0x237/0x24b
[    2.118811]  [<ffffffff81a50e9e>] kernel_init+0xe/0x120
[    2.120713]  [<ffffffff81a5780f>] ret_from_fork+0x1f/0x40
[    2.122618]  [<ffffffff81a50e90>] ? rest_init+0x80/0x80
[    2.124522] Object at ffff8801d0fc0800, in cache kmalloc-512 size:
512
[    2.126453] Allocated:
[    2.128364] PID = 1
[    2.130261]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[    2.132219]  [<ffffffff811fe802>] kasan_kmalloc.part.5+0x62/0xf0
[    2.134206]  [<ffffffff811ff018>] kasan_kmalloc+0x78/0xa0
[    2.136188]  [<ffffffff813048bc>] init_format_format40+0x1ac/0x750
[    2.138174]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    2.140144]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    2.142096]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    2.144055]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    2.146028]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    2.148016]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    2.150014]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    2.152026]  [<ffffffff820a8759>] mount_block_root+0x171/0x3ac
[    2.154055]  [<ffffffff820a8a0b>] mount_root+0x77/0xd8
[    2.156066]  [<ffffffff820a8ba1>] prepare_namespace+0x135/0x16d
[    2.158074]  [<ffffffff820a84ec>] kernel_init_freeable+0x237/0x24b
[    2.160079]  [<ffffffff81a50e9e>] kernel_init+0xe/0x120
[    2.162020]  [<ffffffff81a5780f>] ret_from_fork+0x1f/0x40
[    2.163918] Freed:
[    2.165760] PID = 1
[    2.167562]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[    2.169376]  [<ffffffff811feed7>] kasan_slab_free+0xb7/0x180
[    2.171150]  [<ffffffff811fd67b>] kfree+0x6b/0x90
[    2.172895]  [<ffffffff81304b09>] init_format_format40+0x3f9/0x750
[    2.174616]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    2.176290]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    2.177962]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    2.179633]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    2.181273]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    2.182910]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    2.184541]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    2.186171]  [<ffffffff820a8759>] mount_block_root+0x171/0x3ac
[    2.187804]  [<ffffffff820a8a0b>] mount_root+0x77/0xd8
[    2.189430]  [<ffffffff820a8ba1>] prepare_namespace+0x135/0x16d
[    2.191056]  [<ffffffff820a84ec>] kernel_init_freeable+0x237/0x24b
[    2.192683]  [<ffffffff81a50e9e>] kernel_init+0xe/0x120
[    2.194296]  [<ffffffff81a5780f>] ret_from_fork+0x1f/0x40
[    2.195902] Memory state around the buggy address:
[    2.197517]  ffff8801d0fc0700: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[    2.199178]  ffff8801d0fc0780: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[    2.200818] >ffff8801d0fc0800: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    2.202460]                                                  ^
[    2.204114]  ffff8801d0fc0880: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    2.205804]  ffff8801d0fc0900: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    2.207471]
==================================================================
[    2.209162] Disabling lock debugging due to kernel taint
[    2.210933] reiser4: sda2: use 'fsck.reiser4 --fix' to complete
disk format upgrade.
[    2.212696] usb 1-1.4: new high-speed USB device number 3 using
ehci-pci
[    2.214507] usb 2-1.5: new full-speed USB device number 3 using
ehci-pci
[    2.234910] hid-generic 0003:051D:0002.0002: device has no
listeners, quitting
[    2.312037] reiser4: sda2: using Hybrid Transaction Model.
[    2.313880] VFS: Mounted root (reiser4 filesystem) readonly on device
8:2.
[    2.315949] Freeing unused kernel memory: 968K (ffffffff82086000 -
ffffffff82178000)
[    2.317823] Write protecting the kernel read-only data: 16384k
[    2.320900] Freeing unused kernel memory: 1636K (ffff880001a67000 -
ffff880001c00000)
[    2.331114] Freeing unused kernel memory: 1848K (ffff880001e32000 -
ffff880002000000)
[    2.334644] hub 1-1.4:1.0: USB hub found
[    2.336766] hub 1-1.4:1.0: 2 ports detected
[    2.624398] usb 1-1.4.2: new full-speed USB device number 4 using
ehci-pci
[    5.221431] random: crng init done
[    7.579186] Adding 594300k swap on /dev/md123.  Priority:-1
extents:1 across:594300k
[    7.661464] reiser4: md126: found disk format 4.0.1.
[    7.661541]
==================================================================
[    7.661546] BUG: KASAN: use-after-free in
init_format_format40+0x401/0x750 at addr ffff8801cfaf1350
[    7.661548] Read of size 4 by task mount/1662
[    7.661551] CPU: 0 PID: 1662 Comm: mount Tainted: G    B
4.8.11-gentoo #3
[    7.661552] Hardware name: Gigabyte Technology Co., Ltd. To be
filled by O.E.M./B75-D3V, BIOS F5 07/04/2012
[    7.661553]  ffff8801ceef3580 ffff8801cf087b28 ffffffff81424185
ffff8801d6000600
[    7.661556]  ffff8801cfaf1300 ffff8801cf087b50 ffffffff811ff90c
ffff8801cf087be0
[    7.661559]  ffff8801cfaf1300 ffff8801cfaf1300 ffff8801cf087bd0
ffffffff811ffb79
[    7.661561] Call Trace:
[    7.661565]  [<ffffffff81424185>] dump_stack+0x4d/0x68
[    7.661569]  [<ffffffff811ff90c>] kasan_object_err+0x1c/0x70
[    7.661571]  [<ffffffff811ffb79>] kasan_report_error+0x1c9/0x4b0
[    7.661574]  [<ffffffff812a10cf>] ? zget+0xdf/0x3c0
[    7.661577]  [<ffffffff811ffef4>] kasan_report+0x34/0x40
[    7.661580]  [<ffffffff81304b11>] ? init_format_format40+0x401/0x750
[    7.661582]  [<ffffffff811ff601>] __asan_load4+0x61/0x80
[    7.661585]  [<ffffffff81304b11>] init_format_format40+0x401/0x750
[    7.661588]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    7.661591]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    7.661593]  [<ffffffff812c4df0>] ? reiser4_mount+0x20/0x20
[    7.661594]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    7.661597]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    7.661600]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    7.661602]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    7.661604]  [<ffffffff812337f1>] ? copy_mount_options+0x111/0x220
[    7.661606]  [<ffffffff812337da>] ? copy_mount_options+0xfa/0x220
[    7.661608]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    7.661613]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[    7.661614] Object at ffff8801cfaf1300, in cache kmalloc-512 size:
512
[    7.661615] Allocated:
[    7.661615] PID = 1662
[    7.661616]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[    7.661620]  [<ffffffff811fe802>] kasan_kmalloc.part.5+0x62/0xf0
[    7.661622]  [<ffffffff811ff018>] kasan_kmalloc+0x78/0xa0
[    7.661625]  [<ffffffff813048bc>] init_format_format40+0x1ac/0x750
[    7.661628]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    7.661630]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    7.661632]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    7.661634]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    7.661637]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    7.661639]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    7.661641]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    7.661643]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[    7.661646] Freed:
[    7.661646] PID = 1662
[    7.661647]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[    7.661649]  [<ffffffff811feed7>] kasan_slab_free+0xb7/0x180
[    7.661652]  [<ffffffff811fd67b>] kfree+0x6b/0x90
[    7.661654]  [<ffffffff81304b09>] init_format_format40+0x3f9/0x750
[    7.661657]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[    7.661659]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[    7.661662]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[    7.661664]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[    7.661666]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[    7.661668]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[    7.661670]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[    7.661672]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[    7.661675] Memory state around the buggy address:
[    7.661677]  ffff8801cfaf1200: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    7.661679]  ffff8801cfaf1280: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[    7.661681] >ffff8801cfaf1300: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    7.661681]                                                  ^
[    7.661683]  ffff8801cfaf1380: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    7.661684]  ffff8801cfaf1400: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[    7.661685]
==================================================================
[   10.972840] rcu-perf:rcu_perf_writer 0 has 100 measurements
[   11.016722] rcu-perf:Test complete
[   26.835385] reiser4: md126: using Hybrid Transaction Model.
[   26.857910] reiser4: md127: found disk format 4.0.1.
[   26.857995]
==================================================================
[   26.858002] BUG: KASAN: use-after-free in
init_format_format40+0x401/0x750 at addr ffff8801cbf560d0
[   26.858003] Read of size 4 by task mount/1662
[   26.858006] CPU: 0 PID: 1662 Comm: mount Tainted: G    B
4.8.11-gentoo #3
[   26.858007] Hardware name: Gigabyte Technology Co., Ltd. To be
filled by O.E.M./B75-D3V, BIOS F5 07/04/2012
[   26.858009]  ffff8801b9ded5c0 ffff8801cf087b28 ffffffff81424185
ffff8801d6000600
[   26.858012]  ffff8801cbf56080 ffff8801cf087b50 ffffffff811ff90c
ffff8801cf087be0
[   26.858014]  ffff8801cbf56080 ffff8801cbf56080 ffff8801cf087bd0
ffffffff811ffb79
[   26.858017] Call Trace:
[   26.858020]  [<ffffffff81424185>] dump_stack+0x4d/0x68
[   26.858024]  [<ffffffff811ff90c>] kasan_object_err+0x1c/0x70
[   26.858027]  [<ffffffff811ffb79>] kasan_report_error+0x1c9/0x4b0
[   26.858029]  [<ffffffff812a10cf>] ? zget+0xdf/0x3c0
[   26.858032]  [<ffffffff811ffef4>] kasan_report+0x34/0x40
[   26.858035]  [<ffffffff81304b11>] ? init_format_format40+0x401/0x750
[   26.858038]  [<ffffffff811ff601>] __asan_load4+0x61/0x80
[   26.858040]  [<ffffffff81304b11>] init_format_format40+0x401/0x750
[   26.858043]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[   26.858046]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[   26.858048]  [<ffffffff812c4df0>] ? reiser4_mount+0x20/0x20
[   26.858050]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[   26.858052]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[   26.858055]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[   26.858057]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[   26.858059]  [<ffffffff812337da>] ? copy_mount_options+0xfa/0x220
[   26.858061]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[   26.858065]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[   26.858067] Object at ffff8801cbf56080, in cache kmalloc-512 size:
512
[   26.858067] Allocated:
[   26.858068] PID = 1662
[   26.858069]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[   26.858072]  [<ffffffff811fe802>] kasan_kmalloc.part.5+0x62/0xf0
[   26.858075]  [<ffffffff811ff018>] kasan_kmalloc+0x78/0xa0
[   26.858077]  [<ffffffff813048bc>] init_format_format40+0x1ac/0x750
[   26.858080]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[   26.858082]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[   26.858085]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[   26.858087]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[   26.858089]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[   26.858091]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[   26.858093]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[   26.858095]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[   26.858098] Freed:
[   26.858099] PID = 1662
[   26.858099]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[   26.858102]  [<ffffffff811feed7>] kasan_slab_free+0xb7/0x180
[   26.858104]  [<ffffffff811fd67b>] kfree+0x6b/0x90
[   26.858107]  [<ffffffff81304b09>] init_format_format40+0x3f9/0x750
[   26.858109]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[   26.858111]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[   26.858114]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[   26.858116]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[   26.858118]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[   26.858120]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[   26.858122]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[   26.858124]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[   26.858128] Memory state around the buggy address:
[   26.858130]  ffff8801cbf55f80: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[   26.858131]  ffff8801cbf56000: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[   26.858133] >ffff8801cbf56080: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[   26.858134]                                                  ^
[   26.858135]  ffff8801cbf56100: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[   26.858137]  ffff8801cbf56180: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[   26.858137]
==================================================================
[   27.199941] reiser4: md127: using Hybrid Transaction Model.


[33530.203469] reiser4[mount(11677)]: try_init_format40
(fs/reiser4/plugin/disk_format/disk_format40.c:303)[vpf-1364]:
                  NOTICE: Warning: mounting md125 with fatal errors,
forcing read-only mount.
[33530.203480] reiser4: md125: found disk format 4.0.1.
[33530.203564]
==================================================================
[33530.203570] BUG: KASAN: use-after-free in
init_format_format40+0x401/0x750 at addr ffff88013164d810
[33530.203571] Read of size 4 by task mount/11677
[33530.203574] CPU: 0 PID: 11677 Comm: mount Tainted: G    B
4.8.11-gentoo #3
[33530.203575] Hardware name: Gigabyte Technology Co., Ltd. To be
filled by O.E.M./B75-D3V, BIOS F5 07/04/2012
[33530.203577]  ffff88000e65ce80 ffff88000da87b28 ffffffff81424185
ffff8801d6000600
[33530.203580]  ffff88013164d7c0 ffff88000da87b50 ffffffff811ff90c
ffff88000da87be0
[33530.203582]  ffff88013164d7c0 ffff88013164d7c0 ffff88000da87bd0
ffffffff811ffb79
[33530.203585] Call Trace:
[33530.203588]  [<ffffffff81424185>] dump_stack+0x4d/0x68
[33530.203592]  [<ffffffff811ff90c>] kasan_object_err+0x1c/0x70
[33530.203595]  [<ffffffff811ffb79>] kasan_report_error+0x1c9/0x4b0
[33530.203597]  [<ffffffff812a10cf>] ? zget+0xdf/0x3c0
[33530.203600]  [<ffffffff811ffef4>] kasan_report+0x34/0x40
[33530.203603]  [<ffffffff81304b11>] ? init_format_format40+0x401/0x750
[33530.203605]  [<ffffffff811ff601>] __asan_load4+0x61/0x80
[33530.203608]  [<ffffffff81304b11>] init_format_format40+0x401/0x750
[33530.203610]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[33530.203613]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[33530.203615]  [<ffffffff812c4df0>] ? reiser4_mount+0x20/0x20
[33530.203617]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[33530.203620]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[33530.203622]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[33530.203625]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[33530.203627]  [<ffffffff812337f1>] ? copy_mount_options+0x111/0x220
[33530.203629]  [<ffffffff812337da>] ? copy_mount_options+0xfa/0x220
[33530.203631]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[33530.203635]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[33530.203637] Object at ffff88013164d7c0, in cache kmalloc-512 size:
512
[33530.203637] Allocated:
[33530.203638] PID = 11677
[33530.203639]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[33530.203642]  [<ffffffff811fe802>] kasan_kmalloc.part.5+0x62/0xf0
[33530.203645]  [<ffffffff811ff018>] kasan_kmalloc+0x78/0xa0
[33530.203647]  [<ffffffff813048bc>] init_format_format40+0x1ac/0x750
[33530.203650]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[33530.203652]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[33530.203654]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[33530.203656]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[33530.203659]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[33530.203661]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[33530.203663]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[33530.203665]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[33530.203668] Freed:
[33530.203669] PID = 11677
[33530.203669]  [<ffffffff8109f536>] save_stack_trace+0x26/0x50
[33530.203671]  [<ffffffff811feed7>] kasan_slab_free+0xb7/0x180
[33530.203674]  [<ffffffff811fd67b>] kfree+0x6b/0x90
[33530.203676]  [<ffffffff81304b09>] init_format_format40+0x3f9/0x750
[33530.203679]  [<ffffffff812c4f3a>] fill_super+0x14a/0x300
[33530.203681]  [<ffffffff81209b6f>] mount_bdev+0x1bf/0x200
[33530.203683]  [<ffffffff812c4de0>] reiser4_mount+0x10/0x20
[33530.203685]  [<ffffffff81209dfe>] mount_fs+0x2e/0xe0
[33530.203688]  [<ffffffff81231a96>] vfs_kern_mount+0x66/0x190
[33530.203690]  [<ffffffff81233af2>] do_mount+0x1d2/0x1080
[33530.203692]  [<ffffffff81234e46>] SyS_mount+0x66/0xb0
[33530.203694]  [<ffffffff81a5761b>] entry_SYSCALL_64_fastpath+0x13/0x8f
[33530.203697] Memory state around the buggy address:
[33530.203699]  ffff88013164d700: fc fc fc fc fc fc fc fc fc fc fc fc
fc fc fc fc
[33530.203701]  ffff88013164d780: fc fc fc fc fc fc fc fc fb fb fb fb
fb fb fb fb
[33530.203703] >ffff88013164d800: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[33530.203703]                          ^
[33530.203705]  ffff88013164d880: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[33530.203707]  ffff88013164d900: fb fb fb fb fb fb fb fb fb fb fb fb
fb fb fb fb
[33530.203707]
==================================================================
[33533.485380] reiser4: md125: using Hybrid Transaction Model.
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