Hi Bart, while testing ib_srp based on your srp-ha, we sometimes hit kernel crashes with the call trace below. How to reproduce: 0. Kernel 3.2.15 with SCST v4193 on the target, Kernel 3.2.8 with ib_srp-ha on the initiator. 1. Configure 500+ vdisks on target, and get initiator connected. 2. Exchange data intensively, which works well. 3. (On initiator) delete SRP remote port occasionally, e.g. # echo "1" > /sys/class/srp_remote_ports/port-6\:1/delete And configure again the SRP target. 4. (On target) disable Infiniband interface, and enable it again. 5. Repeat 3 and 4. Then the initiator's kernel suddenly crashes. (but not always) Do you have any idea why? Thanks in advance, Dongsu --------------------------------------------------------------- BUG: unable to handle kernel paging request at 0000000000010001 IP: [<ffffffff8139ec55>] strnlen+0x5/0x40 PGD 212fea067 PUD 2162f8067 PMD 0 Oops: 0000 [#1] SMP CPU 0 Modules linked in: ib_srp scsi_transport_srp scsi_tgt rdma_ucm rdma_cm iw_cm ib_addr ib_ipoib ib_cm ib_sa ib_uverbs ib_umad loop psmouse serio_raw evdev i2c_piix4 tpm_tis tpm tpm_bios ib_mthca sg ib_mad processor amd64_edac_mod edac_core thermal_sys edac_mce_amd ib_core button sd_mod crc_t10dif hid_cherry usb_storage ahci libahci libata scsi_mod [last unloaded: scsi_wait_scan] Pid: 2311, comm: kworker/0:2 Not tainted 3.2.8 #1 Supermicro H8DGU/H8DGU RIP: 0010:[<ffffffff8139ec55>] [<ffffffff8139ec55>] strnlen+0x5/0x40 RSP: 0018:ffff880215fe3c28 EFLAGS: 00010086 RAX: ffffffff81915991 RBX: ffffffff81ba5497 RCX: ffffffffff0a0004 RDX: 0000000000010001 RSI: ffffffffffffffff RDI: 0000000000010001 RBP: ffffffff81ba5860 R08: 000000000000fffb R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000010001 R13: ffffffffffffffff R14: 00000000ffffffff R15: 0000000000000000 FS: 00007faafb63e700(0000) GS:ffff880217c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000010001 CR3: 0000000212f87000 CR4: 00000000000006f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process kworker/0:2 (pid: 2311, threadinfo ffff880215fe2000, task ffff88020f2ce540) Stack: ffffffff813a023c 0000000000000000 ffffffff81ba5497 ffffffffa0131d82 ffffffffa0131d80 ffff880215fe3da0 ffffffff81ba5860 ffff880215fe3c90 ffffffff813a142d 0000000000000016 ffffffff81ba5460 0000000000000400 Call Trace: [<ffffffff813a023c>] ? string+0x4c/0xe0 [<ffffffff813a142d>] ? vsnprintf+0x1ed/0x5b0 [<ffffffffa0131900>] ? do_srp_rport_del+0x30/0x30 [scsi_transport_srp] [<ffffffff813a18a9>] ? vscnprintf+0x9/0x20 [<ffffffff81049b7f>] ? vprintk+0xaf/0x440 [<ffffffff810f3cc0>] ? next_online_pgdat+0x20/0x50 [<ffffffff810f3d20>] ? next_zone+0x30/0x40 [<ffffffff810f4c60>] ? refresh_cpu_vm_stats+0xf0/0x160 [<ffffffffa0131900>] ? do_srp_rport_del+0x30/0x30 [scsi_transport_srp] [<ffffffff816533b6>] ? printk+0x40/0x4a [<ffffffffa013192d>] ? rport_dev_loss_timedout+0x2d/0xa0 [scsi_transport_srp] [<ffffffff81063383>] ? process_one_work+0x113/0x470 [<ffffffff81065c73>] ? worker_thread+0x163/0x3e0 [<ffffffff81065b10>] ? manage_workers+0x200/0x200 [<ffffffff81065b10>] ? manage_workers+0x200/0x200 [<ffffffff8106a126>] ? kthread+0x96/0xa0 [<ffffffff8165f674>] ? kernel_thread_helper+0x4/0x10 [<ffffffff8106a090>] ? kthread_worker_fn+0x180/0x180 [<ffffffff8165f670>] ? gs_change+0x13/0x13 Code: 1f 80 00 00 00 00 31 c0 80 3f 00 48 89 fa 74 14 66 0f 1f 44 00 00 48 ff c2 80 3a 00 75 f8 48 89 d0 48 29 f8 f3 c3 48 85 f6 74 27 <80> 3f 00 74 22 48 ff ce 48 89 f8 eb 0e 66 0f 1f 44 00 00 48 ff RIP [<ffffffff8139ec55>] strnlen+0x5/0x40 RSP <ffff880215fe3c28> CR2: 0000000000010001 ---[ end trace d55b61cd78c54a0a ]--- BUG: unable to handle kernel paging request at fffffffffffffff8 -- 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
