Looking at EPC - of 0x885ac - could *p be null ?
R31 = c0b0b340 ; no
static void ttwu_activate(struct rq *rq, struct task_struct *p, int en_flags)
{
activate_task(rq, p, en_flags);
c008859c: 7f c3 f3 78 mr r3,r30
c00885a0: 7f e4 fb 78 mr r4,r31
c00885a4: 38 a0 00 05 li r5,5
c00885a8: 4b ff fb 39 bl c00880e0 <activate_task>
p->on_rq = 1;
/* if a worker is waking up, notify workqueue */
if (p->flags & PF_WQ_WORKER)
c00885ac: 81 3f 00 0c lwz r9,12(r31)
}
[1]kdb> md c0b0b340
0xc0b0b340 00000100 c0b74000 00000002 00200000 ......@...... ..
0xc0b0b350 00000000 00000000 00000000 e62b9d00 .............+..
0xc0b0b360 00000000 fffeee67 00000001 00000000 .......g........
0xc0b0b370 00000078 00000078 00000078 00000000 ...x...x...x....
0xc0b0b380 c0817520 00000000 00000400 00400000
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https://bugs.launchpad.net/bugs/1279403
Title:
tg3 driver hangs in iscsi booted initrd : (trusty)
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