Hi Folks, We are using Ubuntu linux kernel 3.2.0-29-generic & upon creating a MegaRAID VD, we constantly run into the following OOPs <1>[5277177.633716] BUG: unable to handle kernel NULL pointer dereference at (null) <1>[5277177.665305] IP: [<ffffffff8141fcc2>] scsi_device_put+0x22/0x60 <4>[5277177.696626] PGD 3a7a2a067 PUD 3dba5d067 PMD 0 <0>[5277177.729987] Oops: 0000 [#1] SMP <4>[5277177.760142] CPU 1 <4>[5277177.760192] <4>[5277177.760195] Pid: 25707, comm: kworker/1:2 Tainted: G O 3.2.0-29-generic #46-Ubuntu Dell Inc. PowerEdge R510/0DPRKF <4>[5277177.760200] RIP: 0010:[<ffffffff8141fcc2>] [<ffffffff8141fcc2>] scsi_device_put+0x22/0x60 <4>[5277177.760205] RSP: 0018:ffff8805461dbd90 EFLAGS: 00010286 <4>[5277177.760207] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00000001820000fc <4>[5277177.760210] RDX: 00000001820000fd RSI: ffffea00072c2b00 RDI: ffff8802596cd000 <4>[5277177.760212] RBP: ffff8805461dbda0 R08: 0000000000000001 R09: 0000000000000000 <4>[5277177.760215] R10: 0000000000000020 R11: dead000000100100 R12: ffff8802596cd000 <4>[5277177.760219] R13: ffff8806193a1000 R14: 0000000000000002 R15: 0000000000000002 <4>[5277177.760222] FS: 0000000000000000(0000) GS:ffff880323c00000(0000) knlGS:0000000000000000 <4>[5277177.760225] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b <4>[5277177.760227] CR2: 0000000000000000 CR3: 00000005b26c4000 CR4: 00000000000026e0 <4>[5277177.760230] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 <4>[5277177.760232] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 <4>[5277177.760235] Process kworker/1:2 (pid: 25707, threadinfo ffff8805461da000, task ffff880291f9ae00) <0>[5277177.760237] Stack: <4>[5277177.760238] 0000000000000000 ffff8806193a1690 ffff8805461dbe00 ffffffffa003e610 <4>[5277177.760245] ffff8805461dbde0 ffff8802596cd000 ffff8805744d7000 0000000000000000 <4>[5277177.760249] ffff880610b3f000 ffff8805744d7000 ffff880617659280 ffff880323c17300 <0>[5277177.760254] Call Trace: <4>[5277177.760264] [<ffffffffa003e610>] megasas_aen_polling+0x1d0/0x520 [megaraid_sas] <4>[5277177.760272] [<ffffffffa003e440>] ? megasas_get_ld_list+0x380/0x380 [megaraid_sas] <4>[5277177.760279] [<ffffffff810849ea>] process_one_work+0x11a/0x480 <4>[5277177.760284] [<ffffffff81085794>] worker_thread+0x164/0x370 <4>[5277177.760288] [<ffffffff81085630>] ? manage_workers.isra.29+0x130/0x130 <4>[5277177.760293] [<ffffffff81089fbc>] kthread+0x8c/0xa0 <4>[5277177.760299] [<ffffffff81664034>] kernel_thread_helper+0x4/0x10 <4>[5277177.760303] [<ffffffff81089f30>] ? flush_kthread_worker+0xa0/0xa0 <4>[5277177.760306] [<ffffffff81664030>] ? gs_change+0x13/0x13 <0>[5277177.760308] Code: 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 48 83 ec 10 48 89 5d f0 4c 89 65 f8 66 66 66 66 90 48 8b 07 49 89 fc 48 8b 80 b8 00 00 00 <48> 8b 18 48 85 db 74 0c 48 89 df e8 2e 42 c8 ff 85 c0 75 1a 49 <1>[5277177.760332] RIP [<ffffffff8141fcc2>] scsi_device_put+0x22/0x60 <4>[5277177.760337] RSP <ffff8805461dbd90> <0>[5277177.760338] CR2: 0000000000000000 I realize that this issue was already reported at http://permalink.gmane.org/gmane.linux.raid/43146 I checked the latest kernel & don’t see any fixtures in this area. Can you pls advise on how to fix this issue? Thanks. PS: I am not subscribed to linux-scsi mailing list. So, please CC me in the reply. Any help appreciated. Thanks. --Shyam -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
