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" <caiq...@redhat.com> > To: net...@vger.kernel.org > Cc: "Dave Miller" <da...@redhat.com>, sta...@vger.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" <caiq...@redhat.com> > > To: sta...@vger.kernel.org > > Cc: "Dave Miller" <da...@redhat.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 majord...@vger.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 majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
