On Thu, Dec 15, 2016 at 09:24:11AM +1100, Dave Chinner wrote:
> Hi folks,
>
> Just updated my test boxes from 4.9 to a current Linus 4.10 merge
> window kernel to test the XFS merge I am preparing for Linus.
> Unfortunately, all my test VMs using iscsi failed pretty much
> instantly on the first mount of an iscsi device:
>
> [ 159.372704] XFS (sdb): EXPERIMENTAL reverse mapping btree feature enabled.
> Use at your own risk!
> [ 159.374612] XFS (sdb): Mounting V5 Filesystem
> [ 159.425710] XFS (sdb): Ending clean mount
> [ 160.274438] BUG: unable to handle kernel NULL pointer dereference at
> 000000000000000c
> [ 160.275851] IP: iscsi_tcp_segment_done+0x20d/0x2e0
FYI, crash is here:
(gdb) l *(iscsi_tcp_segment_done+0x20d)
0xffffffff81b950bd is in iscsi_tcp_segment_done
(drivers/scsi/libiscsi_tcp.c:102).
97 iscsi_tcp_segment_init_sg(struct iscsi_segment *segment,
98 struct scatterlist *sg, unsigned int offset)
99 {
100 segment->sg = sg;
101 segment->sg_offset = offset;
102 segment->size = min(sg->length - offset,
103 segment->total_size -
segment->total_copied);
104 segment->data = NULL;
105 }
106
So it looks to be sg = NULL, which means there's probably an issue
with the scatterlist...
-Dave.
> [ 160.276565] PGD 336ed067 [ 160.276885] PUD 31b0d067
> PMD 0 [ 160.277309]
> [ 160.277523] Oops: 0000 [#1] PREEMPT SMP
> [ 160.278004] Modules linked in:
> [ 160.278407] CPU: 0 PID: 16 Comm: kworker/u2:1 Not tainted 4.9.0-dgc #18
> [ 160.279224] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
> Debian-1.8.2-1 04/01/2014
> [ 160.280314] Workqueue: iscsi_q_2 iscsi_xmitworker
> [ 160.280919] task: ffff88003e280000 task.stack: ffffc90000080000
> [ 160.281647] RIP: 0010:iscsi_tcp_segment_done+0x20d/0x2e0
> [ 160.282312] RSP: 0018:ffffc90000083c38 EFLAGS: 00010206
> [ 160.282980] RAX: 0000000000000000 RBX: ffff880039061730 RCX:
> 0000000000000000
> [ 160.283854] RDX: 0000000000001e00 RSI: 0000000000000000 RDI:
> ffff880039061730
> [ 160.284738] RBP: ffffc90000083c90 R08: 0000000000000200 R09:
> 00000000000005a8
> [ 160.285627] R10: 000000009835607d R11: 0000000000000000 R12:
> 0000000000000200
> [ 160.286495] R13: 0000000000000000 R14: ffff8800390615a0 R15:
> ffff880039061730
> [ 160.287362] FS: 0000000000000000(0000) GS:ffff88003fc00000(0000)
> knlGS:0000000000000000
> [ 160.288340] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [ 160.289113] CR2: 000000000000000c CR3: 0000000031a8d000 CR4:
> 00000000000006f0
> [ 160.290084] Call Trace:
> [ 160.290429] ? inet_sendpage+0x4d/0x140
> [ 160.290957] iscsi_sw_tcp_xmit_segment+0x89/0x110
> [ 160.291597] iscsi_sw_tcp_pdu_xmit+0x56/0x180
> [ 160.292190] iscsi_tcp_task_xmit+0xb8/0x280
> [ 160.292771] iscsi_xmit_task+0x53/0xc0
> [ 160.293282] iscsi_xmitworker+0x274/0x310
> [ 160.293835] process_one_work+0x1de/0x4d0
> [ 160.294388] worker_thread+0x4b/0x4f0
> [ 160.294889] kthread+0x10c/0x140
> [ 160.295333] ? process_one_work+0x4d0/0x4d0
> [ 160.295898] ? kthread_create_on_node+0x40/0x40
> [ 160.296525] ret_from_fork+0x25/0x30
> [ 160.297015] Code: 43 18 00 00 00 00 e9 ad fe ff ff 48 8b 7b 30 e8 da e7 ca
> ff 8b 53 10 44 89 ee 48 89 df 2b 53 14 48 89 43 30 c7 43 40 00 00 00 00 <8b
> [ 160.300674] RIP: iscsi_tcp_segment_done+0x20d/0x2e0 RSP: ffffc90000083c38
> [ 160.301584] CR2: 000000000000000c
>
>
> Known problem, or something new?
>
> Cheers,
>
> Dave.
> --
> Dave Chinner
> da...@fromorbit.com
>
--
Dave Chinner
da...@fromorbit.com
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