Kernel BUG at mm/slab.c:605 when using sisips module

Solution Unverified - Updated -


  • Red Hat Enterprise linux 5


System panicked with following message.

----------- [cut here ] --------- [please bite here ] ---------
Kernel BUG at mm/slab.c:605
invalid opcode: 0000 [1] SMP 
last sysfs file: /devices/system/cpu/cpu23/topology/thread_siblings
CPU 11 
Modules linked in: lp parport_pc parport ipmi_si edd st ide_cd mpt2sas mptctl ipmi_devintf ipmi_msghandler dell_rbu autofs4 nfs nfs_acl lockd sunrpc bonding be2iscsi ib_iser rdma_cm ib_cm iw_cm ib_sa ib_mad ib_core ib_addr iscsi_tcp bnx2i cnic ipv6 xfrm_nalgo crypto_api uio cxgb3i libcxgbi cxgb3 8021q libiscsi_tcp libiscsi2 scsi_transport_iscsi2 scsi_transport_iscsi sisips(PU) dm_round_robin dm_multipath scsi_dh video backlight sbs power_meter hwmon i2c_ec i2c_core dell_wmi wmi button battery asus_acpi acpi_memhotplug ac joydev tpm_tis sr_mod cdrom i7core_edac tpm edac_mc sg tpm_bios serio_raw pcspkr bnx2 dm_raid45 dm_message dm_region_hash dm_mem_cache dm_snapshot dm_zero dm_mirror dm_log dm_mod usb_storage qla2xxx scsi_transport_fc ata_piix libata shpchp mptsas mptscsih mptbase scsi_transport_sas sd_mod scsi_mod ext3 jbd uhci_hcd ohci_hcd ehci_hcd
Pid: 8268, comm: mdServer Tainted: P     ---- 2.6.18-308.4.1.el5 #1
RIP: 0010:[<ffffffff800df83c>]  [<ffffffff800df83c>] free_block+0x94/0x145
RSP: 0018:ffff8105a8467db8  EFLAGS: 00010046
RAX: 0000000000000000 RBX: ffff8103483e7000 RCX: 0000000000000069
RDX: ffff81010b7cda88 RSI: ffff8106300c6348 RDI: 0000000000000000
RBP: ffff810115aca140 R08: ffff81062fe3ec04 R09: 0000000000000246
R10: 0000000000000000 R11: 0000000000000246 R12: ffff810645167100
R13: ffff8103483e7c00 R14: 000000000000003b R15: 0000000000000001
FS:  000000004238f940(0063) GS:ffff81062fe3ecc0(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00002abcad4373c0 CR3: 0000000335302000 CR4: 00000000000006a0
Process mdServer (pid: 8268, threadinfo ffff8105a8466000, task ffff81033b9ce7a0)
Stack:  0000000000000000 0000003c88550e36 ffff81062fe46418 000000000000003c
 ffff81062fe46400 ffff810115aca140 0000000000000001 ffff810645167100
 000000004238ee00 ffffffff800dfa21 ffff81062fe46400 0000000000000001
Call Trace:
 [<ffffffff800dfa21>] cache_flusharray+0x74/0xa3
 [<ffffffff8000b63a>] kfree+0x1c0/0x1dc
 [<ffffffff8854ee36>] :sisips:_ZN8UserSids5clearEv+0x26/0x40
 [<ffffffff8853c1af>] :sisips:_Z12ProcessNewIdv+0x2f/0xb0
 [<ffffffff8853dcb2>] :sisips:hook_setresuid+0x102/0x190
 [<ffffffff8005d28d>] tracesys+0xd5/0xe0

Code: 0f 0b 68 35 0b 2c 80 c2 5d 02 eb fe 48 8b 5a 30 49 63 c7 49 
RIP  [<ffffffff800df83c>] free_block+0x94/0x145
 RSP <ffff8105a8467db8>


Contact the module vendor.

Root Cause

Seems like the slab corruption is casued by thridparty module sisips.

Diagnostic Steps

The panic is in a defined bug location written to check the consistency of slab.

   0602 static inline struct slab *page_get_slab(struct page *page)
   0603 {
   0604     page = compound_head(page);
   0605     BUG_ON(!PageSlab(page));
   0606     return (struct slab *)page->lru.prev;
   0607 }

Checking the slab..

 crash> kmem -s
 ffff8106300c21c0 size-256                 256       2407      2745    183     4k
 ffff8106300c1180 size-128(DMA)            128          0         0      0     4k
 ffff8106300c0140 size-64(DMA)              64          0         0      0     4k
 kmem: size-64: partial list: slab: ffff810be89c4000  bad inuse counter: 4294967236 <------------

Looks like there is a corruption in it.

Let us have a look at the back trace..

 #5 [ffff8105a8467e00] cache_flusharray at ffffffff800dfa21
 #6 [ffff8105a8467e30] kfree at ffffffff8000b63a
 #7 [ffff8105a8467e70] _ZN8UserSids5clearEv at ffffffff8854ee36 [sisips]
 #8 [ffff8105a8467e80] _Z12ProcessNewIdv at ffffffff8853c1af [sisips]
 #9 [ffff8105a8467ea0] hook_setresuid at ffffffff8853dcb2 [sisips]
 #10 [ffff8105a8467f80] tracesys at ffffffff8005d28d (via system_call)

The panic code is moving through the sisips code.

Checking the stack..

 #6 [ffff8105a8467e30] kfree at ffffffff8000b63a
     ffff8105a8467e38: 0000000000000000 ffff8103483e7c00 
     ffff8105a8467e48: ffff81031d89c4f8 0000000000000000 
     ffff8105a8467e58: ffff81031d89c400 0000000000000000 
     ffff8105a8467e68: 000000004238ee01 ffffffff8854ee36 

 It looks like sisips is passing invalid addresses.

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