This morning I noticed that firefox had crashed overnight, and the
desktop was behaving very slow, as if the machine were swapping
heavily. I expected to see some bloated process in "top"s output, but
after sorting the processes by memory, I saw nothing unusual.
Applications were fairly normal, but there was very little free memory.
Next, I turned to /proc/meminfo, and it looks like the kernel had
allocated 1.4GB of slab! According to the slabinfo file, there were
nearly 7 million dentry slabs "active" (if I'm reading it correctly). I
don't really understand the dentry cache, but it seems odd to have 7M
dentry caches when I have fewer than 500k files and directories total on
all of the mounted filesystems.
There's nothing odd in the logs except this:
May 20 03:24:44 herald kernel: printk: 37 messages suppressed.
The kernel didn't print any messages in several hours prior to 3:24, and
nothing afterward until I rebooted the system. Unfortunately, I didn't
check "dmesg" before rebooting. :(
Not much was running overnight: I was logged in to Gnome, Thunderbird
and Firefox were running, and so was Miro.
Before I file a bug report, I was hoping to see if anyone else has seen
this behaviour, or can shed any light on possible causes other than a
kernel bug.
Copies of the meminfo and slabinfo files from /proc, taken before
rebooting, are attached.
MemTotal: 2061404 kB
MemFree: 227456 kB
Buffers: 2752 kB
Cached: 98996 kB
SwapCached: 39640 kB
Active: 288544 kB
Inactive: 41160 kB
SwapTotal: 2064376 kB
SwapFree: 1937560 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 212972 kB
Mapped: 42116 kB
Slab: 1448668 kB
SReclaimable: 1421052 kB
SUnreclaim: 27616 kB
PageTables: 25564 kB
NFS_Unstable: 4 kB
Bounce: 0 kB
CommitLimit: 3095076 kB
Committed_AS: 706336 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 83940 kB
VmallocChunk: 34359654311 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
slabinfo - version: 2.1
# name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail>
udf_inode_cache 6 6 640 6 1 : tunables 0 0 0 : slabdata 1 1 0
nfs_direct_cache 0 0 128 32 1 : tunables 0 0 0 : slabdata 0 0 0
nfs_inode_cache 350 372 992 4 1 : tunables 0 0 0 : slabdata 93 93 0
fuse_request 14 14 584 7 1 : tunables 0 0 0 : slabdata 2 2 0
fuse_inode 6 6 640 6 1 : tunables 0 0 0 : slabdata 1 1 0
rpc_inode_cache 18 18 832 9 2 : tunables 0 0 0 : slabdata 2 2 0
nf_conntrack_expect 0 0 240 17 1 : tunables 0 0 0 : slabdata 0 0 0
UDPv6 12 12 960 4 1 : tunables 0 0 0 : slabdata 3 3 0
TCPv6 8 8 1792 4 2 : tunables 0 0 0 : slabdata 2 2 0
kmalloc_dma-512 8 8 512 8 1 : tunables 0 0 0 : slabdata 1 1 0
dm_uevent 0 0 2608 3 2 : tunables 0 0 0 : slabdata 0 0 0
scsi_io_context 144 144 112 36 1 : tunables 0 0 0 : slabdata 4 4 0
ext3_inode_cache 2414 3830 768 5 1 : tunables 0 0 0 : slabdata 766 766 0
ext3_xattr 92 92 88 46 1 : tunables 0 0 0 : slabdata 2 2 0
journal_handle 340 340 24 170 1 : tunables 0 0 0 : slabdata 2 2 0
journal_head 85 126 96 42 1 : tunables 0 0 0 : slabdata 3 3 0
revoke_table 256 256 16 256 1 : tunables 0 0 0 : slabdata 1 1 0
revoke_record 256 256 32 128 1 : tunables 0 0 0 : slabdata 2 2 0
UNIX 538 561 704 11 2 : tunables 0 0 0 : slabdata 51 51 0
cfq_io_context 101 120 168 24 1 : tunables 0 0 0 : slabdata 5 5 0
cfq_queue 107 120 136 30 1 : tunables 0 0 0 : slabdata 4 4 0
mqueue_inode_cache 4 4 896 4 1 : tunables 0 0 0 : slabdata 1 1 0
isofs_inode_cache 0 0 616 6 1 : tunables 0 0 0 : slabdata 0 0 0
hugetlbfs_inode_cache 7 7 584 7 1 : tunables 0 0 0 : slabdata 1 1 0
dquot 0 0 256 16 1 : tunables 0 0 0 : slabdata 0 0 0
shmem_inode_cache 939 950 792 5 1 : tunables 0 0 0 : slabdata 190 190 0
pid_namespace 0 0 2104 3 2 : tunables 0 0 0 : slabdata 0 0 0
nsproxy 0 0 56 73 1 : tunables 0 0 0 : slabdata 0 0 0
xfrm_dst_cache 28 30 384 10 1 : tunables 0 0 0 : slabdata 3 3 0
ip_dst_cache 132 552 320 12 1 : tunables 0 0 0 : slabdata 46 46 0
TCP 19 24 1664 4 2 : tunables 0 0 0 : slabdata 6 6 0
blkdev_queue 32 32 1752 4 2 : tunables 0 0 0 : slabdata 8 8 0
blkdev_requests 30 39 296 13 1 : tunables 0 0 0 : slabdata 3 3 0
biovec-128 52 56 2048 4 2 : tunables 0 0 0 : slabdata 14 14 0
sock_inode_cache 594 649 704 11 2 : tunables 0 0 0 : slabdata 59 59 0
file_lock_cache 42 42 192 21 1 : tunables 0 0 0 : slabdata 2 2 0
Acpi-Parse 714 714 40 102 1 : tunables 0 0 0 : slabdata 7 7 0
taskstats 26 26 312 13 1 : tunables 0 0 0 : slabdata 2 2 0
proc_inode_cache 767 786 600 6 1 : tunables 0 0 0 : slabdata 131 131 0
sigqueue 50 50 160 25 1 : tunables 0 0 0 : slabdata 2 2 0
radix_tree_node 3353 4515 560 7 1 : tunables 0 0 0 : slabdata 645 645 0
bdev_cache 30 30 768 5 1 : tunables 0 0 0 : slabdata 6 6 0
sysfs_dir_cache 9129 9129 80 51 1 : tunables 0 0 0 : slabdata 179 179 0
inode_cache 1614 1645 568 7 1 : tunables 0 0 0 : slabdata 235 235 0
dentry 6722227 6722295 208 19 1 : tunables 0 0 0 : slabdata 353805 353805 0
names_cache 40 40 4096 2 2 : tunables 0 0 0 : slabdata 20 20 0
selinux_inode_security 7505 19152 72 56 1 : tunables 0 0 0 : slabdata 342 342 0
idr_layer_cache 509 525 536 7 1 : tunables 0 0 0 : slabdata 75 75 0
buffer_head 1495 3384 112 36 1 : tunables 0 0 0 : slabdata 94 94 0
mm_struct 105 126 832 9 2 : tunables 0 0 0 : slabdata 14 14 0
vm_area_struct 11692 12627 176 23 1 : tunables 0 0 0 : slabdata 549 549 0
files_cache 166 180 768 5 1 : tunables 0 0 0 : slabdata 36 36 0
signal_cache 141 152 896 4 1 : tunables 0 0 0 : slabdata 38 38 0
sighand_cache 139 147 2112 3 2 : tunables 0 0 0 : slabdata 49 49 0
task_struct 224 224 6272 1 2 : tunables 0 0 0 : slabdata 224 224 0
anon_vma 4095 4992 32 128 1 : tunables 0 0 0 : slabdata 39 39 0
shared_policy_node 0 0 48 85 1 : tunables 0 0 0 : slabdata 0 0 0
numa_policy 295708 295970 24 170 1 : tunables 0 0 0 : slabdata 1741 1741 0
kmalloc-4096 99 104 4096 8 8 : tunables 0 0 0 : slabdata 13 13 0
kmalloc-2048 1103 1152 2048 16 8 : tunables 0 0 0 : slabdata 72 72 0
kmalloc-1024 599 624 1024 4 1 : tunables 0 0 0 : slabdata 156 156 0
kmalloc-512 245 264 512 8 1 : tunables 0 0 0 : slabdata 33 33 0
kmalloc-256 913 976 256 16 1 : tunables 0 0 0 : slabdata 61 61 0
kmalloc-128 748 960 128 32 1 : tunables 0 0 0 : slabdata 30 30 0
kmalloc-64 4954 7168 64 64 1 : tunables 0 0 0 : slabdata 112 112 0
kmalloc-32 25988 27392 32 128 1 : tunables 0 0 0 : slabdata 214 214 0
kmalloc-16 126907 127744 16 256 1 : tunables 0 0 0 : slabdata 499 499 0
kmalloc-8 9179 9216 8 512 1 : tunables 0 0 0 : slabdata 18 18 0
kmalloc-192 5706 6909 192 21 1 : tunables 0 0 0 : slabdata 329 329 0
kmalloc-96 2979 3360 96 42 1 : tunables 0 0 0 : slabdata 80 80 0
kmem_cache_node 0 0 56 73 1 : tunables 0 0 0 : slabdata 0 0 0
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