linux-kernel - Re: BUG at kmem_cache

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Date:	Fri, 22 Mar 2013 02:35:34 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	CAI Qian <caiqian@...hat.com>
cc:	linux-mm <linux-mm@...ck.org>, linux-kernel@...r.kernel.org,
	Oleg Nesterov <oleg@...hat.com>
Subject: Re: BUG at kmem_cache_alloc

On Fri, 22 Mar 2013, CAI Qian wrote:

> Starting to see those on 3.8.4 (never saw in 3.8.2) stable kernel on a few systems
> during LTP run,
> 
> [11297.597242] BUG: unable to handle kernel paging request at 00000000fffffffe 
> [11297.598022] IP: [] kmem_cache_alloc+0x68/0x1e0 

Is this repeatable?  Do you have CONFIG_SLAB or CONFIG_SLUB enabled?

> [11297.598022] PGD 7b9eb067 PUD 0  
> [11297.598022] Oops: 0000 [#2] SMP  
> [11297.598022] Modules linked in: cmtp kernelcapi bnep scsi_transport_iscsi rfcomm l2tp_ppp l2tp_netlink l2tp_core hidp ipt_ULOG af_key nfc rds pppoe pppox ppp_generic slhc af_802154 atm ip6table_filter ip6_tables iptable_filter ip_tables btrfs zlib_deflate vfat fat nfs_layout_nfsv41_files nfsv4 auth_rpcgss nfsv3 nfs_acl nfsv2 nfs lockd sunrpc fscache nfnetlink_log nfnetlink bluetooth rfkill arc4 md4 nls_utf8 cifs dns_resolver nf_tproxy_core nls_koi8_u nls_cp932 ts_kmp sctp sg kvm_amd kvm virtio_balloon i2c_piix4 pcspkr xfs libcrc32c ata_generic pata_acpi cirrus drm_kms_helper ttm ata_piix virtio_net drm libata virtio_blk i2c_core floppy dm_mirror dm_region_hash dm_log dm_mod [last unloaded: ipt_REJECT] 
> [11297.598022] CPU 1  
> [11297.598022] Pid: 14134, comm: ltp-pan Tainted: G      D      3.8.4+ #1 Bochs Bochs 
> [11297.598022] RIP: 0010:[]  [] kmem_cache_alloc+0x68/0x1e0 
> [11297.598022] RSP: 0018:ffff8800447dbdd0  EFLAGS: 00010246 
> [11297.598022] RAX: 0000000000000000 RBX: ffff88007c169970 RCX: 00000000018acdcd 
> [11297.598022] RDX: 000000000006c104 RSI: 00000000000080d0 RDI: ffff88007d04ac00 
> [11297.598022] RBP: ffff8800447dbe10 R08: 0000000000017620 R09: ffffffff810fe2e2 
> [11297.598022] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffffe 
> [11297.598022] R13: 00000000000080d0 R14: ffff88007d04ac00 R15: ffff88007d04ac00 
> [11297.598022] FS:  00007f09c29b4740(0000) GS:ffff88007fd00000(0000) knlGS:00000000f74d86c0 
> [11297.598022] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b 
> [11297.598022] CR2: 00000000fffffffe CR3: 0000000037213000 CR4: 00000000000006e0 
> [11297.598022] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
> [11297.598022] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
> [11297.598022] Process ltp-pan (pid: 14134, threadinfo ffff8800447da000, task ffff8800551ab2e0) 
> [11297.598022] Stack: 
> [11297.598022]  ffffffff810fe2e2 ffffffff8108cf0f 0000000001200011 ffff88007c169970 
> [11297.598022]  0000000000000000 00007f09c29b4a10 0000000000000000 ffff88007c169970 
> [11297.598022]  ffff8800447dbe30 ffffffff810fe2e2 0000000000000000 0000000001200011 
> [11297.598022] Call Trace: 
> [11297.598022]  [] ? __delayacct_tsk_init+0x22/0x40 
> [11297.598022]  [] ? prepare_creds+0xdf/0x190 
> [11297.598022]  [] __delayacct_tsk_init+0x22/0x40 
> [11297.598022]  [] copy_process.part.25+0x31f/0x13f0 
> [11297.598022]  [] do_fork+0xa9/0x350 
> [11297.598022]  [] sys_clone+0x16/0x20 
> [11297.598022]  [] stub_clone+0x69/0x90 
> [11297.598022]  [] ? system_call_fastpath+0x16/0x1b 
> [11297.598022] Code: 90 4d 89 fe 4d 8b 06 65 4c 03 04 25 c8 db 00 00 49 8b 50 08 4d 8b 20 4d 85 e4 0f 84 2b 01 00 00 49 63 46 20 4d 8b 06 41 f6 c0 0f <49> 8b 1c 04 0f 85 55 01 00 00 48 8d 4a 01 4c 89 e0 65 49 0f c7  
> [11297.598022] RIP  [] kmem_cache_alloc+0x68/0x1e0 
> [11297.598022]  RSP  
> [11297.598022] CR2: 00000000fffffffe 
> [11297.727799] ---[ end trace 037bde72f23b34d2 ]---
> 
> Never saw this in mainline but only something like this wondering could be related
> (that kmem_cache_alloc also in the trace).
> 

These are unrelated.
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