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Date: Tue, 10 Aug 2021 18:59:26 +0300 From: Mike Rapoport <rppt@...nel.org> To: Geert Uytterhoeven <geert@...ux-m68k.org> Cc: Mikael Pettersson <mikpelinux@...il.com>, Finn Thain <fthain@...ux-m68k.org>, Linux Kernel list <linux-kernel@...r.kernel.org>, linux-m68k <linux-m68k@...ts.linux-m68k.org>, stable <stable@...r.kernel.org>, Peter Xu <peterx@...hat.com> Subject: Re: [BISECTED][REGRESSION] 5.10.56 longterm kernel breakage on m68k/aranym On Mon, Aug 09, 2021 at 03:40:04PM +0200, Geert Uytterhoeven wrote: > CC Mike > > On Mon, Aug 9, 2021 at 3:32 PM Mikael Pettersson <mikpelinux@...il.com> wrote: > > On Mon, Aug 9, 2021 at 3:59 AM Finn Thain <fthain@...ux-m68k.org> wrote: > > > On Sun, 8 Aug 2021, Mikael Pettersson wrote: > > > > On Sun, Aug 8, 2021 at 1:20 AM Finn Thain <fthain@...ux-m68k.org> wrote: > > > > > On Sat, 7 Aug 2021, Mikael Pettersson wrote: > > > > > > I updated the 5.10 longterm kernel on one of my m68k/aranym VMs from > > > > > > 5.10.47 to 5.10.56, and the new kernel failed to boot: > > > > > > > > > > > > ARAnyM 1.1.0 > > > > > > Using config file: 'aranym1.headless.config' > > > > > > Could not open joystick 0 > > > > > > ARAnyM RTC Timer: /dev/rtc: Permission denied > > > > > > ARAnyM LILO: Error loading ramdisk 'root.bin' > > > > > > Blitter tried to read byte from register ff8a00 at 0077ee > > > > > > > > > > > > At this point it kept running, but produced no output to the console, > > > > > > and would never get to the point of starting user-space. Attaching gdb > > > > > > to aranym showed nothing interesting, i.e. it seemed to be executing > > > > > > normally. > > > > My initial bisect was wrong. I tried reverting 8f34f1eac382 from > > 5.10.57 but that made no difference, so I re-ran the git bisect with > > all known good points pre-marked. This landed on: > > # first bad commit: [ce6ee46e0f39ed97e23ebf7b5a565e0266a8a1a3] > > mm/page_alloc: fix memory map initialization for descending nodes > > > > Reverting _that_ from 5.10.57 does unbreak that kernel. Indeed there is a problem with that commit in 5.10. The memmap initialization relies on availability of zone_to_nid() to link struct page to a node. But in 5.10 zone_to_nid() is only defined for NUMA, but not for DISCONTIGMEM. Mikael, can you please try the patch below: diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 9d0c454d23cd..63b550403317 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -445,7 +445,7 @@ struct zone { */ long lowmem_reserve[MAX_NR_ZONES]; -#ifdef CONFIG_NUMA +#ifdef CONFIG_NEED_MULTIPLE_NODES int node; #endif struct pglist_data *zone_pgdat; @@ -896,7 +896,7 @@ static inline bool populated_zone(struct zone *zone) return zone->present_pages; } -#ifdef CONFIG_NUMA +#ifdef CONFIG_NEED_MULTIPLE_NODES static inline int zone_to_nid(struct zone *zone) { return zone->node; -- Sincerely yours, Mike.
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