[Bug 1424780] [NEW] iscsitarget crash in 3.19 backport

[Stefan Bader]

Public bug reported:

When testing the 3,19 enablement patches the DKMS module compiles ok and
connection to iscsi target seems ok. An fsck run on the disk seemed ok
as well. But starting write tests caused the following crash:

Feb 23 19:12:59 arc-vivid6401 kernel: [  281.409079] BUG: unable to handle kernel paging request at 00000000fffffe40
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.411431] IP: [<ffffffff813c5932>] memcpy+0x12/0x110
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] PGD 0 
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Oops: 0002 [#1] SMP 
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Modules linked in: iscsi_trgt(OE) dm_crypt ppdev serio_raw parport_pc parport isofs psmouse floppy
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] CPU: 1 PID: 1210 Comm: istd1 Tainted: G           OE  3.19.0-5-generic #5-Ubuntu
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.7.5-20140531_171129-lamiak 04/01/2014
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] task: ffff88003bc2ebf0 ti: ffff88003c250000 task.ti: ffff88003c250000
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RIP: 0010:[<ffffffff813c5932>]  [<ffffffff813c5932>] memcpy+0x12/0x110
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RSP: 0018:ffff88003c2535c0  EFLAGS: 00010202
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RAX: 00000000fffffe40 RBX: 0000000000000e03 RCX: 0000000000000001
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RDX: 0000000000000001 RSI: ffff88003cd2ac8e RDI: 00000000fffffe40
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RBP: ffff88003c253608 R08: 0000160000000000 R09: 0000000000000e03
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] R10: 0000000000000e03 R11: ffff88003d00c140 R12: ffff88003c2538d8
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88003c253d18
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] FS:  00007fdc5903c740(0000) GS:ffff88003fd00000(0000) knlGS:0000000000000000
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] CR2: 00000000fffffe40 CR3: 0000000001c13000 CR4: 00000000000006e0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Stack:
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  ffffffff811a5f04 ffff88003c2535d8 ffff88003cd2ac8f ffffea0000f30a00
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  0000000000000e03 00000000000016a0 0000000000000e03 ffff88003cd9a600
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  000000000000003e ffff88003c253618 ffffffff811a6008 ffff88003c253688
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Call Trace:
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff811a5f04>] ? copy_to_iter+0x244/0x2f0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff811a6008>] copy_page_to_iter+0x58/0x70
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff816b702c>] skb_copy_datagram_iter+0x13c/0x290
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff8170d1a2>] tcp_recvmsg+0x692/0xb80
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff8173a56b>] inet_recvmsg+0x6b/0x80
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff816a7fa2>] sock_recvmsg+0xa2/0xd0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff817ce110>] ? _raw_spin_unlock_bh+0x20/0x70
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff8170b272>] ? tcp_ioctl+0x72/0x1c0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff81739032>] ? inet_ioctl+0x82/0x90
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffffc0440642>] do_recv+0xf2/0x220 [iscsi_trgt]
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff816c4f99>] ? dev_hard_start_xmit+0x169/0x3a0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff816c4b2e>] ? validate_xmit_skb.isra.92.part.93+0x1e/0x320
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffffc0440d9c>] istd+0x56c/0x13f0 [iscsi_trgt]
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff810a8ddd>] ? set_next_entity+0x9d/0xb0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff8173a420>] ? inet_sendmsg+0xb0/0xb0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff817c910c>] ? __schedule+0x39c/0x910
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffffc0440830>] ? nthread_wakeup+0x40/0x40 [iscsi_trgt]
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff810950e9>] kthread+0xc9/0xe0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff817ce47c>] ret_from_fork+0x7c/0xb0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  [<ffffffff81095020>] ? kthread_create_on_node+0x1c0/0x1c0
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] Code: 2b 43 50 88 43 4e 48 83 c4 08 5b 5d f3 c3 90 90 90 90 90 90 90 90 90 90 90 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 <f3> a4 c3 20 4c 8b 06 4c 8b 4e 08 4c 8b 56 10 4c 8b 5e 18 48 8d 
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] RIP  [<ffffffff813c5932>] memcpy+0x12/0x110
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927]  RSP <ffff88003c2535c0>
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] CR2: 00000000fffffe40
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] ---[ end trace 62bcc3808e619ccf ]---
Feb 23 19:12:59 arc-vivid6401 kernel: [  281.412927] note: istd1[1210] exited with preempt_count 1

** Affects: iscsitarget (Ubuntu)
     Importance: Undecided
         Status: New

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Title:
  iscsitarget crash in 3.19 backport

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