cgroups/netfilter : kernel NULL pointer BUG at 00000038

From: Toralf FÃrster
Date: Fri Sep 12 2014 - 12:19:51 EST

Today I observed within a 32 bit KVM machine (stable Gentoo x86 Linux) the following :

Sep 12 18:14:37 n22kvmclone kernel: [ 37.964900] ip_tables: (C) 2000-2006 Netfilter Core Team
Sep 12 18:14:38 n22kvmclone kernel: [ 38.412110] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
Sep 12 18:14:38 n22kvmclone kernel: [ 39.032978] ------------[ cut here ]------------
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033009] WARNING: CPU: 0 PID: 1632 at kernel/cgroup.c:1034 cgroup_get+0x91/0xb0()
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033013] Modules linked in: xt_NFLOG xt_limit ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_recent xt_conntrack nf_conntrack iptable_filter ip_tables af_packet dm_crypt dm_mod usbhid mousedev uhci_hcd ehci_pci microcode psmouse ehci_hcd evdev usbcore atkbd usb_common virtio_console processor button
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033104] CPU: 0 PID: 1632 Comm: runscript.sh Not tainted 3.17.0-rc4 #18
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033107] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033110] 00000000 00000000 f4b33e54 cc04b292 00000000 f4b33e84 cbc46d64 cc18f11c
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033119] 00000000 00000660 cc19bcc5 0000040a cbcb5841 cbcb5841 f56de400 f4963688
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033128] f4983cb8 f4b33e94 cbc46da2 00000009 00000000 f4b33eb0 cbcb5841 cbe59246
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033137] Call Trace:
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033163] [<cc04b292>] dump_stack+0x41/0x52
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033179] [<cbc46d64>] warn_slowpath_common+0x84/0xa0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033186] [<cbcb5841>] ? cgroup_get+0x91/0xb0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033191] [<cbcb5841>] ? cgroup_get+0x91/0xb0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033197] [<cbc46da2>] warn_slowpath_null+0x22/0x30
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033202] [<cbcb5841>] cgroup_get+0x91/0xb0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033223] [<cbe59246>] ? kstrtoll+0x16/0x70
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033230] [<cbcb5d3d>] cgroup_kn_lock_live+0x2d/0x70
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033235] [<cbcb8386>] __cgroup_procs_write.isra.26+0x56/0x240
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033240] [<cbcb8570>] ? __cgroup_procs_write.isra.26+0x240/0x240
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033245] [<cbcb8587>] cgroup_tasks_write+0x17/0x20
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033250] [<cbcb5645>] cgroup_file_write+0x45/0x140
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033256] [<cbcb5600>] ? kill_css+0xd0/0xd0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033275] [<cbda8d21>] kernfs_fop_write+0xd1/0x160
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033281] [<cbda8c50>] ? kernfs_vma_page_mkwrite+0x90/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033291] [<cbd49bbd>] vfs_write+0x9d/0x1e0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033297] [<cbda8c50>] ? kernfs_vma_page_mkwrite+0x90/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033306] [<cbd64522>] ? __fdget+0x12/0x20
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033311] [<cbd4a0b2>] SyS_write+0x52/0xa0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033321] [<cc0522ab>] sysenter_do_call+0x12/0x12
Sep 12 18:14:38 n22kvmclone kernel: [ 39.033325] ---[ end trace f3513225d53cf0f3 ]---
Sep 12 18:14:38 n22kvmclone kernel: [ 39.036277] BUG: unable to handle kernel NULL pointer dereference at 00000038
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] IP: [<cbcb5c2c>] cgroup_put+0xc/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] *pde = 00000000
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Oops: 0000 [#1] SMP
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Modules linked in: xt_NFLOG xt_limit ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_recent xt_conntrack nf_conntrack iptable_filter ip_tables af_packet dm_crypt dm_mod usbhid mousedev uhci_hcd ehci_pci microcode psmouse ehci_hcd evdev usbcore atkbd usb_common virtio_console processor button
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] CPU: 0 PID: 1632 Comm: runscript.sh Tainted: G W 3.17.0-rc4 #18
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.7.5-0-ge51488c-20140602_164612-nilsson.home.kraxel.org 04/01/2014
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] task: f6216390 ti: f4b32000 task.ti: f4b32000
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] EIP: 0060:[<cbcb5c2c>] EFLAGS: 00010282 CPU: 0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] EIP is at cgroup_put+0xc/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] EAX: 00000000 EBX: f4963688 ECX: 0042621a EDX: 00000008
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] ESI: 00000000 EDI: f4983cb8 EBP: f4b33ea0 ESP: f4b33e8c
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] CR0: 8005003b CR2: 00000038 CR3: 35610000 CR4: 000006c0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Stack:
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] cbda848d 00000000 00000001 00000000 f4963688 f4b33eb0 cbcb5cee 00000000
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] f4963688 f4b33ec0 cbcb5d79 f6216390 00000000 f4b33efc cbcb8386 00000246
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] 00000000 f62168fc f62168f0 00000002 00000000 f611c880 f611c000 f4b33f1c
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Call Trace:
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbda848d>] ? kernfs_unbreak_active_protection+0x4d/0x50
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb5cee>] cgroup_kn_unlock+0x3e/0x60
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb5d79>] cgroup_kn_lock_live+0x69/0x70
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb8386>] __cgroup_procs_write.isra.26+0x56/0x240
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb8570>] ? __cgroup_procs_write.isra.26+0x240/0x240
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb8587>] cgroup_tasks_write+0x17/0x20
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb5645>] cgroup_file_write+0x45/0x140
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbcb5600>] ? kill_css+0xd0/0xd0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbda8d21>] kernfs_fop_write+0xd1/0x160
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbda8c50>] ? kernfs_vma_page_mkwrite+0x90/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbd49bbd>] vfs_write+0x9d/0x1e0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbda8c50>] ? kernfs_vma_page_mkwrite+0x90/0x90
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbd64522>] ? __fdget+0x12/0x20
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cbd4a0b2>] SyS_write+0x52/0xa0
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] [<cc0522ab>] sysenter_do_call+0x12/0x12
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] Code: ff c7 04 24 e8 2f 19 cc e8 45 35 39 00 e9 76 ff ff ff 8d b6 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 53 83 ec 10 3e 8d 74 26 00 <f6> 40 38 01 89 c3 74 0c 83 c4 10 5b 5d c3 8d b6 00 00 00 00 31
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] EIP: [<cbcb5c2c>] cgroup_put+0xc/0x90 SS:ESP 0068:f4b33e8c
Sep 12 18:14:38 n22kvmclone kernel: [ 39.037026] CR2: 0000000000000038
Sep 12 18:14:38 n22kvmclone kernel: [ 39.092883] ---[ end trace f3513225d53cf0f4 ]---


--
Toralf
pgp key: 0076 E94E

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