Memory leak in kernel-2.6.25.3-18.fc9.x86_64
Amadeus W.M.
amadeus84 at verizon.net
Thu May 22 04:59:54 UTC 2008
On Tue, 20 May 2008 09:15:18 -0700, Gordon Messmer wrote:
> 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
Mine looks ok:
more /proc/meminfo
MemTotal: 1537948 kB
MemFree: 290780 kB
Buffers: 67920 kB
Cached: 689064 kB
SwapCached: 4 kB
Active: 560348 kB
Inactive: 478792 kB
HighTotal: 638140 kB
HighFree: 40424 kB
LowTotal: 899808 kB
LowFree: 250356 kB
SwapTotal: 3068372 kB
SwapFree: 3068220 kB
Dirty: 52 kB
Writeback: 0 kB
AnonPages: 276684 kB
Mapped: 70920 kB
Slab: 82964 kB
SReclaimable: 53528 kB
SUnreclaim: 29436 kB
PageTables: 4692 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 3837344 kB
Committed_AS: 1029028 kB
VmallocTotal: 110584 kB
VmallocUsed: 8700 kB
VmallocChunk: 95044 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 4096 kB
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