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Message-ID: <69507431.8510419.1357351367419.JavaMail.root@redhat.com> Date: Fri, 4 Jan 2013 21:02:47 -0500 (EST) From: CAI Qian <caiqian@...hat.com> To: Christoph Lameter <cl@...ux.com> Cc: netdev@...r.kernel.org, Dave Miller <davem@...hat.com>, stable@...r.kernel.org, linux-kernel <linux-kernel@...r.kernel.org>, Pekka Enberg <penberg@...nel.org>, Glauber Costa <glommer@...allels.com> Subject: Re: load/unload dccp module caused oops ----- Original Message ----- > From: "Christoph Lameter" <cl@...ux.com> > To: "CAI Qian" <caiqian@...hat.com> > Cc: netdev@...r.kernel.org, "Dave Miller" <davem@...hat.com>, stable@...r.kernel.org, "linux-kernel" > <linux-kernel@...r.kernel.org>, "Pekka Enberg" <penberg@...nel.org>, "Glauber Costa" <glommer@...allels.com> > Sent: Friday, January 4, 2013 11:05:35 PM > Subject: Re: load/unload dccp module caused oops > > See the fix available here: > > https://patchwork.kernel.org/patch/1909861/ Excellent! Thanks Christoph. Tested-by: CAI Qian <caiqian@...hat.com> > > > On Fri, 4 Jan 2013, CAI Qian wrote: > > > The bisecting pointed out this commit fixed the problem in > > the mainline. > > > > 3c58346525d82625e68e24f071804c2dc057b6f4 > > slab: Simplify bootstrap > > > > However, simply back-ported this single commit to the 3.7.1 > > stable wasn't enough to fix it. My guess is that there are > > some other slab/slub commits required to fix this. Keep digging... > > > > The kernel config used the SLUB, > > http://people.redhat.com/qcai/stable/.config > > > > CAI Qian > > > > ----- Original Message ----- > > > From: "CAI Qian" <caiqian@...hat.com> > > > To: netdev@...r.kernel.org > > > Cc: "Dave Miller" <davem@...hat.com>, stable@...r.kernel.org > > > Sent: Friday, January 4, 2013 9:57:43 AM > > > Subject: Re: load/unload dccp module caused > > > > > > Adding the netdev as Dave suggested. > > > > > > ----- Original Message ----- > > > > From: "CAI Qian" <caiqian@...hat.com> > > > > To: stable@...r.kernel.org > > > > Cc: "Dave Miller" <davem@...hat.com> > > > > Sent: Monday, December 31, 2012 5:42:59 PM > > > > Subject: load/unload dccp module caused > > > > > > > > Just a head up that load and then unload the dccp module > > > > caused an oops below using the current stable kernel - v3.7.1. > > > > Some additional data point here: the mainline v3.6 release has > > > > no such problem, so this looks like a regression. The mainline > > > > v3.8-rc1 also has no such problem, so it looks like it has > > > > already been fixed there but looks like yet queued up for the > > > > stable yet (tested a few commits in Greg's stable-queue and > > > > Dave's net-stable queue did not find anything obvious to fix > > > > this). I am in-process to bisect to figure out the one that > > > > need to back-port right now. > > > > > > > > [ 93.809573] > > > > ============================================================================= > > > > [ 93.809577] BUG kmalloc-16 (Tainted: G B ): Objects > > > > remaining in kmalloc-16 on kmem_cache_close() > > > > [ 93.809580] > > > > ----------------------------------------------------------------------------- > > > > [ 93.809580] > > > > ... > > > > [ 356.336244] INFO: Object 0xc0000000fa1f0aa0 @offset=2720 > > > > [ 356.336247] INFO: Object 0xc0000000fa1f0ab0 @offset=2736 > > > > [ 356.336249] INFO: Object 0xc0000000fa1f0ac0 @offset=2752 > > > > [ 356.336254] INFO: Object 0xc0000000fa1f0ad0 @offset=2768 > > > > [ 356.336257] INFO: Object 0xc0000000fa1f0ae0 @offset=2784 > > > > [ 356.336259] INFO: Object 0xc0000000fa1f0af0 @offset=2800 > > > > [ 356.336262] INFO: Object 0xc0000000fa1f0b80 @offset=2944 > > > > [ 356.336264] INFO: Object 0xc0000000fa1f0bd0 @offset=3024 > > > > [ 356.336271] INFO: Object 0xc0000000fa1f1870 @offset=6256 > > > > [ 356.336274] INFO: Object 0xc0000000fa1f1880 @offset=6272 > > > > [ 356.336276] INFO: Object 0xc0000000fa1f1890 @offset=6288 > > > > [ 356.346976] INFO: Object 0xc0000000fa1f18a0 @offset=6304 > > > > [ 356.346979] INFO: Object 0xc0000000fa1f18b0 @offset=6320 > > > > [ 356.346981] INFO: Object 0xc0000000fa1f1950 @offset=6480 > > > > [ 356.346986] INFO: Object 0xc0000000fa1f1960 @offset=6496 > > > > [ 356.346989] INFO: Object 0xc0000000fa1f1970 @offset=6512 > > > > [ 356.346991] INFO: Object 0xc0000000fa1f1980 @offset=6528 > > > > [ 356.346994] INFO: Object 0xc0000000fa1f1990 @offset=6544 > > > > [ 356.346997] INFO: Object 0xc0000000fa1f19a0 @offset=6560 > > > > [ 356.346999] INFO: Object 0xc0000000fa1f19b0 @offset=6576 > > > > [ 356.347005] INFO: Object 0xc0000000fa1f19c0 @offset=6592 > > > > [ 356.347008] INFO: Object 0xc0000000fa1f19d0 @offset=6608 > > > > [ 356.347010] INFO: Object 0xc0000000fa1f19e0 @offset=6624 > > > > [ 356.347012] INFO: Object 0xc0000000fa1f19f0 @offset=6640 > > > > [ 356.347081] kmem_cache_destroy kmalloc-16: Slab cache still > > > > has > > > > objects > > > > ... > > > > [441283.322161] BUG: unable to handle kernel NULL pointer > > > > dereference > > > > at (null) > > > > [441283.331020] IP: [<ffffffff811785f9>] > > > > __kmem_cache_shutdown+0xa9/0x2f0 > > > > [441283.338320] PGD 105568f067 PUD 104a086067 PMD 0 > > > > [441283.343600] Oops: 0000 [#1] SMP > > > > [441283.347318] Modules linked in: dccp(-) nf_tproxy_core > > > > deflate > > > > zlib_deflate lzo nls_koi8_u nls_cp932 ts_kmp sctp libcrc32c > > > > binfmt_misc des_generic md4 nls_utf8 cifs dns_resolver sg > > > > iTCO_wdt > > > > kvm_intel igb iTCO_vendor_support coretemp kvm crc32c_intel > > > > lpc_ich > > > > i7core_edac edac_core i2c_i801 i2c_core mfd_core pcspkr > > > > microcode > > > > ioatdma dca sr_mod cdrom ata_generic sd_mod pata_acpi > > > > crc_t10dif > > > > ata_piix libata megaraid_sas dm_mirror dm_region_hash dm_log > > > > dm_mod > > > > [last unloaded: inet_diag] > > > > [441283.395187] CPU 6 > > > > [441283.397337] Pid: 40979, comm: modprobe Tainted: G B > > > > 3.7.1+ #10 QCI QSSC-S4R/QSSC-S4R > > > > [441283.407245] RIP: 0010:[<ffffffff811785f9>] > > > > [<ffffffff811785f9>] > > > > __kmem_cache_shutdown+0xa9/0x2f0 > > > > [441283.417256] RSP: 0018:ffff88205247de08 EFLAGS: 00010292 > > > > [441283.423280] RAX: ffff881059780001 RBX: ffff88085acfa000 > > > > RCX: > > > > 00000000001c7d72 > > > > [441283.431336] RDX: 00000000001c7d71 RSI: 0000000000000ff0 > > > > RDI: > > > > ffff88085f802600 > > > > [441283.439394] RBP: ffff88205247de68 R08: 0000000000016940 > > > > R09: > > > > ffff88105fd36940 > > > > [441283.447451] R10: ffffea004165e000 R11: ffffffff81178721 > > > > R12: > > > > ffffffffffffffe0 > > > > [441283.455508] R13: ffff88085acf9000 R14: ffff88085f802500 > > > > R15: > > > > ffffea00216b3e40 > > > > [441283.463565] FS: 00007fd36f206740(0000) > > > > GS:ffff88105fc20000(0000) > > > > knlGS:0000000000000000 > > > > [441283.472687] CS: 0010 DS: 0000 ES: 0000 CR0: > > > > 000000008005003b > > > > [441283.479194] CR2: 00007fd545ae9c74 CR3: 000000104a273000 > > > > CR4: > > > > 00000000000007e0 > > > > [441283.487251] DR0: 0000000000000000 DR1: 0000000000000000 > > > > DR2: > > > > 0000000000000000 > > > > [441283.495308] DR3: 0000000000000000 DR6: 00000000ffff0ff0 > > > > DR7: > > > > 0000000000000400 > > > > [441283.503366] Process modprobe (pid: 40979, threadinfo > > > > ffff88205247c000, task ffff8820493fb240) > > > > [441283.512974] Stack: > > > > [441283.515312] ffffffffa0169760 ffff8810597800c0 > > > > 0000000000000000 > > > > 0000000000000000 > > > > [441283.523705] ffff88085f8010d0 ffff88085f8010c0 > > > > ffff88205247de68 > > > > ffff88085f802500 > > > > [441283.532104] ffff88085f802568 0000000000000000 > > > > 00000000011ec578 > > > > 0000000000000000 > > > > [441283.540499] Call Trace: > > > > [441283.543328] [<ffffffff8114993a>] > > > > kmem_cache_destroy+0x3a/0xe0 > > > > [441283.549941] [<ffffffffa0164c0a>] tfrc_li_exit+0x1a/0x30 > > > > [dccp] > > > > [441283.556649] [<ffffffffa01635e8>] tfrc_lib_exit+0x18/0x20 > > > > [dccp] > > > > [441283.563451] [<ffffffffa01583e6>] > > > > ccid_cleanup_builtins+0x26/0x30 > > > > [dccp] > > > > [441283.571032] [<ffffffffa0164e33>] dccp_fini+0xe/0x1db > > > > [dccp] > > > > [441283.577449] [<ffffffffa0164e25>] ? > > > > scaled_div.part.0+0x6/0x6 > > > > [dccp] > > > > [441283.584639] [<ffffffff810bc3fe>] > > > > sys_delete_module+0x16e/0x2d0 > > > > [441283.591342] [<ffffffff810d851c>] ? > > > > __audit_syscall_entry+0xcc/0x300 > > > > [441283.598530] [<ffffffff810d8b3c>] ? > > > > __audit_syscall_exit+0x3ec/0x450 > > > > [441283.605719] [<ffffffff815d3b99>] > > > > system_call_fastpath+0x16/0x1b > > > > [441283.612516] Code: 48 39 d7 4d 89 ec 75 41 e9 55 01 00 00 0f > > > > 1f > > > > 44 > > > > 00 00 e8 0b f7 16 00 48 8b 55 c8 4c 89 fe 4c 89 f7 48 83 6a 08 > > > > 01 > > > > e8 > > > > 97 c6 ff ff <49> 8b 44 24 20 49 8d 7c 24 20 4d 89 e7 48 83 e8 > > > > 20 48 > > > > 39 7d c0 > > > > [441283.634440] RIP [<ffffffff811785f9>] > > > > __kmem_cache_shutdown+0xa9/0x2f0 > > > > [441283.641831] RSP <ffff88205247de08> > > > > [441283.645817] CR2: 0000000000000000 > > > > [441283.649815] ---[ end trace 8e20d31634421a27 ]--- > > > > > > > > CAI Qian > > > > -- > > > > To unsubscribe from this list: send the line "unsubscribe > > > > stable" > > > > in > > > > the body of a message to majordomo@...r.kernel.org > > > > More majordomo info at > > > > http://vger.kernel.org/majordomo-info.html > > > > > > > -- > > > To unsubscribe from this list: send the line "unsubscribe stable" > > > in > > > the body of a message to majordomo@...r.kernel.org > > > More majordomo info at > > > http://vger.kernel.org/majordomo-info.html > > > > > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to 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