This bug was fixed in the package linux - 6.2.0-18.18
---------------
linux (6.2.0-18.18) lunar; urgency=medium
* lunar/linux: 6.2.0-18.18 -proposed tracker (LP: #2011750)
* lunar/linux 6.2 fails to boot on arm64 (LP: #2011748)
- SAUCE: Revert "efi: random: fix NULL-deref when refreshing seed"
- SAUCE: Revert "efi: random: refresh non-volatile random seed when RNG is
initialized"
-- Andrea Righi <[email protected]> Wed, 15 Mar 2023 23:54:18
+0100
** Changed in: linux (Ubuntu Lunar)
Status: Incomplete => Fix Released
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https://bugs.launchpad.net/bugs/2011413
Title:
lunar/linux 6.2 fails to boot on ppc64el
Status in linux package in Ubuntu:
Fix Released
Status in linux source package in Lunar:
Fix Released
Bug description:
[Impact]
Try to boot the latest lunar/linux 6.2.0-16.16 on a ppc64 VM triggers
the following bug at boot:
event-sources: Unable to request interrupt 23 for
/event-sources/hot-plug-events
WARNING: CPU: 0 PID: 1 at arch/powerpc/platforms/pseries/event_sources.c:26
request_event_sources_irqs+0xbc/0xf0
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W 6.2.2-kc #1
Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1200 0xf000005
of:SLOF,HEAD pSeries
NIP: c000000002022eec LR: c000000002022ee8 CTR: 0000000000000000
REGS: c000000003483910 TRAP: 0700 Tainted: G W (6.2.2-kc)
MSR: 8000000002029033 <SF,VEC,EE,ME,IR,DR,RI,LE> CR: 24483200 XER: 00000000
CFAR: c000000000180838 IRQMASK: 0
GPR00: c000000002022ee8 c000000003483bb0 c000000001a5ce00 0000000000000050
GPR04: c000000002437d78 c000000002437e28 0000000000000001 0000000000000001
GPR08: c000000002437d00 0000000000000001 0000000000000000 0000000044483200
GPR12: 0000000000000000 c000000002720000 c000000000012758 0000000000000000
GPR16: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR20: 0000000000000000 0000000000000000 0000000000000000 0000000000000000
GPR24: 0000000000000000 c0000000020033fc cccccccccccccccd c0000000000e07f0
GPR28: c000000000db0520 0000000000000000 c0000000fff92ac0 0000000000000017
NIP [c000000002022eec] request_event_sources_irqs+0xbc/0xf0
LR [c000000002022ee8] request_event_sources_irqs+0xb8/0xf0
Call Trace:
[c000000003483bb0] [c000000002022ee8] request_event_sources_irqs+0xb8/0xf0
(unreliable)
[c000000003483c40] [c000000002022fa0]
__machine_initcall_pseries_init_ras_hotplug_IRQ+0x80/0xb0
[c000000003483c70] [c0000000000121b8] do_one_initcall+0x98/0x300
[c000000003483d50] [c000000002004b28] kernel_init_freeable+0x2ec/0x370
[c000000003483df0] [c000000000012780] kernel_init+0x30/0x190
[c000000003483e50] [c00000000000cf5c] ret_from_kernel_thread+0x5c/0x64
--- interrupt: 0 at 0x0
[Test case]
Simply boot the kernel in a ppc64 vm.
[Fix]
Bisecting the problem shows that the commit that introduced the bug is
the following:
baa49d81a94b ("powerpc/pseries: hvcall stack frame overhead")
To fix the problem we just need to revert this commit and also the
following (because we need to re-introduce STACK_FRAME_OVERHEAD):
dfecd06bc552 ("powerpc: remove STACK_FRAME_OVERHEAD")
[Regression potential]
This restores a previous behavior on powerpc and without this it's
impossible to boot. However, we are likely to get a proper fix
upstream, so reverting the commit should be considered only as a
temporary workaround, until we get a proper upstream fix.
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