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SubjectACPI issues on cold power on [bisected]
I've been sitting on this for a while and should have spent time to
investigate sooner, but it's been an odd failure mode that wasn't quite
obvious.

In 4.9 if I cold power on my laptop (Dell E7240) it fails to boot - I
don't see anything after grub says its booting. In 4.10 onwards the
laptop boots, but I get an Oops as part of the boot and ACPI is unhappy
(no suspend, no clean poweroff, no ACPI buttons). The Oops is below;
taken from 4.12 as that's the most recent error dmesg I have saved but
also seen back in 4.10. It's always address 0x30 for the dereference.

Rebooting the laptop does not lead to these problems; it's *only* from a
complete cold boot that they arise (which didn't help me in terms of
being able to reliably bisect). Once I realised that I was able to
bisect, but it leads me to an odd commit:

86d9f48534e800e4d62cdc1b5aaf539f4c1d47d6
(mm/slab: fix kmemcg cache creation delayed issue)

If I revert this then I can cold boot without problems.

Also I don't see the problem with a stock Debian kernel, I think because
the ACPI support is modularised.

Config, dmesg + bisect log at:

https://the.earth.li/~noodles/acpi-problem/

-------
BUG: unable to handle kernel NULL pointer dereference at 0000000000000030
IP: netlink_broadcast_filtered+0x1d/0x3e0
PGD 0
P4D 0

Oops: 0000 [#1] SMP
Modules linked in:
CPU: 0 PID: 41 Comm: kworker/0:1 Not tainted 4.12.0 #1
Hardware name: Dell Inc. Latitude E7240/07RPNV, BIOS A21 05/08/2017
Workqueue: kacpi_notify acpi_os_execute_deferred
task: ffff914e4c321240 task.stack: ffffa3bd4017c000
RIP: 0010:netlink_broadcast_filtered+0x1d/0x3e0
RSP: 0000:ffffa3bd4017fd90 EFLAGS: 00010286
RAX: 0000000000000001 RBX: ffff914e4c82b300 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000001080020 RDI: ffff914e4c82b300
RBP: ffff914e4c305614 R08: 0000000001080020 R09: 0000000000000000
R10: 0000000000000014 R11: ffffffffb8a31d40 R12: 0000000000000000
R13: 0000000000000000 R14: ffff914e4c305614 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff914e5ea00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000030 CR3: 0000000236c09000 CR4: 00000000001406f0
Call Trace:
? __kmalloc_reserve.isra.37+0x24/0x70
? __nlmsg_put+0x63/0x80
? netlink_broadcast+0xa/0x10
? acpi_bus_generate_netlink_event+0x10d/0x150
? acpi_ev_notify_dispatch+0x37/0x4c
? acpi_os_execute_deferred+0xb/0x20
? process_one_work+0x1cf/0x3c0
? worker_thread+0x42/0x3c0
? __schedule+0x26c/0x660
? kthread+0xf7/0x130
? create_worker+0x190/0x190
? kthread_create_on_node+0x40/0x40
? ret_from_fork+0x22/0x30
Code: c8 c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 89 cf 41 56 41 55 49 89 fd 48 89 f7 44 89 c6 41 54 41 89 d4 55 53 48 83 ec 38 <49> 8b 6d 30 44 89 44 24 24 4c 89 4c 24 28 e8 a0 ec ff ff 48 c7
RIP: netlink_broadcast_filtered+0x1d/0x3e0 RSP: ffffa3bd4017fd90
CR2: 0000000000000030
---[ end trace f8e25281792d4743 ]---

J.

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|@/ Debian GNU/Linux Developer | of : 47 - More coffee.
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