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SubjectRe: [Bug #13116] Can't boot with nosmp
On Sun, 26 Apr 2009, Dan Williams wrote:

> Rafael J. Wysocki wrote:
> > This message has been generated automatically as a part of a report
> > of recent regressions.
> >
> > The following bug entry is on the current list of known regressions
> > from 2.6.29. Please verify if it still should be listed and let me know
> > (either way).
> This is still unresolved.
> Stephen, please send your config.

Given the stack for the initial report, why would a config other than
enabling CONFIG_DMA_ENGINE help if there's no ifdefs involved?

This is happening in the for_each_possible_cpu() loop within
dma_channel_rebalance(), which makes sense since the machine boots fine
normally but not with `nosmp'.

channel_table[] is not being initialized per-cpu for non-online cpus?

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff803d6b6b>] dma_channel_rebalance+0x46/0x1d1
PGD 1d8db067 PUD 179bc067 PMD 0
Oops: 0002 [#1] SMP
last sysfs file: /sys/kernel/uevent_seqnum
Modules linked in: async_tx(+) xor raid1 raid0 multipath linear md_mod virtio_blk sg sr_mod cdrom \
pata_acpi virtio_pci virtio_ring virtio floppy uhci_hcd usbcore ata_piix ata_generic thermal processor \
fan thermal_sys
Pid: 1789, comm: modprobe Not tainted 2.6.29-1-amd64-vyatta #1
RIP: 0010:[<ffffffff803d6b6b>] [<ffffffff803d6b6b>] dma_channel_rebalance+0x46/0x1d1
RSP: 0018:ffff880017a6de78 EFLAGS: 00010283
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000020 R09: ffffffff8063ab00
R10: ffffffffa0106d80 R11: ffff880001010300 R12: 000000000000000c
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 00007fe9c51536e0(0000) GS:ffffffff806ac080(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000000 CR3: 000000001d903000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process modprobe (pid: 1789, threadinfo ffff880017a6c000, task ffff88001fb14380)
0000000000000000 ffffffff805fc4e8 0000000000001ee9 ffffffff805fc4e8
0000000000000000 0000000000000000 0000000000000000 ffffffff803d730a
00000000fffffffe ffffffffa0106d80 0000000000001ee9 ffffffffa0109000
Call Trace:
[<ffffffff803d730a>] dmaengine_get+0xca/0xdd
[<ffffffffa0109000>] async_tx_init+0x0/0x1b [async_tx]
[<ffffffffa0109009>] async_tx_init+0x9/0x1b [async_tx]
[<ffffffff80209051>] _stext+0x51/0x120
[<ffffffff8032bfde>] __up_read+0x13/0x8d
[<ffffffff8024aa4d>] __blocking_notifier_call_chain+0x51/0x5f
[<ffffffff80257c75>] sys_init_module+0xa0/0x1ba
[<ffffffff8020be5b>] system_call_fastpath+0x16/0x1b

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