On Thu, Mar 25, 2021 at 02:03:25PM +1100, Finn Thain wrote:
Hi All,
Stan has sent me a series of logs from v5.10 and v5.11 showing a
regression apparently caused by the deprecation of CONFIG_DISCONTIGMEM.
This v5.11 kernel build has CONFIG_FLATMEM=y and
CONFIG_FORCE_MAX_ZONEORDER=11 which is now the default. The 5.10 build has
CONFIG_DISCONTIGMEM=y.
This system is a Mac IIci, which has two RAM banks. Bank A has physical
address 0 and bank B has 0x04000000. This model often has two
discontiguous RAM chunks. However, installing 64 MB in bank A does avoid
that.
There is a bootloader issue in play here. The bootloader (Penguin) prefers
to locate the kernel and initrd in the largest bank. Hence it may fail to
choose the lowest bank even when that bank is sufficiently large. When
that happens, Linux is unable to use the RAM in bank A.
Linux has always complained about this situation but now it crashes. This
seems to be a regression in v5.11. Can anyone help debug this?
There was a bug in the definition of ARCH_PFN_OFFSET that's quite probably
causes the crashes when the kernel is located in the second memory bank.
The fix was posted a while ago:
https://lore.kernel.org/linux-m68k/20210228190828.392974-1-angelo@xxxxxxxxxxxxxxxx
Can you check if this helps?
These are some of the configurations Stan has tested (figures in MB):
Bank A Bank B v5.10 memory v5.11 memory
-----------------------------------------------
1 16 16 crash (log below)
16 1 17 17 (log below)
16 64 64 crash
64 16 80 80
ABCFGHIJK
[ 0.000000] Linux version 5.11.0-mac (fthain@nippy) (m68k-linux-gnu-gcc (btc) 6.4.0, GNU ld (btc) 2.28) #1 Tue Mar 16 16:56:05 AEDT 2021
[ 0.000000] Saving 414 bytes of bootinfo
[ 0.000000] printk: bootconsole [debug0] enabled
[ 0.000000] Detected Macintosh model: 11
[ 0.000000] Apple Macintosh IIci
[ 0.000000] Ignoring memory chunk at 0x0:0x100000 before the first chunk
[ 0.000000] Fix your bootloader or use a memfile to make use of this area!
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000004000000-0x0000004fffffffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000004000000-0x0000000004ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000004000000-0x0000000004ffffff]
[ 0.000000] Data write fault at 0x7057c000 in Super Data (pc=0x225f12)
[ 0.000000] BAD KERNEL BUSERR
[ 0.000000] Oops: 00000000
[ 0.000000] Modules linked in:
[ 0.000000] PC: [<00225f12>] memset+0x6a/0x9c
[ 0.000000] SR: 2714 SP: (ptrval) a2: 00485500
[ 0.000000] d0: 00000000 d1: 00000024 d2: 00000001 d3: 0000ffff
[ 0.000000] d4: 00005000 d5: 004ad0a0 a0: 7057c000 a1: 7057c004
[ 0.000000] Process swapper (pid: 0, task=(ptrval))
[ 0.000000] Frame format=A ssw=070d isc=ffee isb=4242 daddr=7057c000 dobuf=00000000
[ 0.000000] Stack from 00483de4:
[ 0.000000] 00004000 00004000 00483e28 004e14c0 7057c000 00000000 00000024 00005000
[ 0.000000] 00004000 00000000 00483e78 00483e74 000ad4f6 004e250c 00483e70 004e13a4
[ 0.000000] 00005000 00483e7c 004e15ba 00001000 00000000 00000000 00004000 00005000
[ 0.000000] 00000000 00000000 00000001 00001000 00000000 00004000 00000000 00000fdc
[ 0.000000] 003a9ef6 003b7be8 004abe54 00004000 00005000 00000000 00483ee4 004d33e2
[ 0.000000] 00001000 00000000 00000000 00004000 00483f58 003a9ef6 00483f44 00000014
[ 0.000000] Call Trace: [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<004e14c0>] memmap_init_zone+0x11c/0x188
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<000ad4f6>] zone_batchsize+0x0/0x5a
[ 0.000000] [<004e250c>] __next_mem_pfn_range+0x0/0x82
[ 0.000000] [<004e13a4>] memmap_init_zone+0x0/0x188
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<004e15ba>] memmap_init+0x8e/0xae
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<003a9ef6>] printk+0x0/0x16
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<004d33e2>] free_area_init_node+0x426/0x444
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<003a9ef6>] printk+0x0/0x16
[ 0.000000] [<004d2fbc>] free_area_init_node+0x0/0x444
[ 0.000000] [<004d3962>] free_area_init+0x466/0x492
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<004d397a>] free_area_init+0x47e/0x492
[ 0.000000] [<004cced0>] kernel_page_table+0x0/0x84
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<000012fc>] kernel_pg_dir+0x2fc/0x1000
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00001000>] kernel_pg_dir+0x0/0x1000
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<00004000>] hardware_proc_show+0x4c/0x9e
[ 0.000000] [<00005000>] do_notify_resume+0x482/0x60a
[ 0.000000] [<004cd40c>] paging_init+0x416/0x422
[ 0.000000] [<0021e0ea>] strlcpy+0x0/0x6c
[ 0.000000] [<004cc916>] setup_arch+0x62/0x1f0
[ 0.000000] [<004cd79a>] mac_parse_bootinfo+0x0/0xee
[ 0.000000] [<003a9ef6>] printk+0x0/0x16
[ 0.000000] [<004cca44>] setup_arch+0x190/0x1f0
[ 0.000000] [<003a9ef6>] printk+0x0/0x16
[ 0.000000] [<004ca41e>] start_kernel+0x50/0x486
[ 0.000000] [<004c9410>] _sinittext+0x410/0xadc
[ 0.000000]
[ 0.000000] Code: 22c0 22c0 22c0 22c0 22c0 22c0 22c0 22c0 <51ca> ffee 4242 5382 6ae6 0801 0001 6704 3280 5489 0801 0000 6702 1280 2008 241f
[ 0.000000] Disabling lock debugging due to kernel taint
[ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task!
[ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---
ABCFGHIJK
[ 0.000000] Linux version 5.11.0-mac (fthain@nippy) (m68k-linux-gnu-gcc (btc) 6.4.0, GNU ld (btc) 2.28) #1 Tue Mar 16 16:56:05 AEDT 2021
[ 0.000000] Saving 414 bytes of bootinfo
[ 0.000000] printk: bootconsole [debug0] enabled
[ 0.000000] Detected Macintosh model: 11
[ 0.000000] Apple Macintosh IIci
[ 0.000000] Zone ranges:
[ 0.000000] DMA [mem 0x0000000000000000-0x00000040ffffffff]
[ 0.000000] Normal empty
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000000ffffff]
[ 0.000000] node 0: [mem 0x0000000004000000-0x00000000040fffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x00000000040fffff]
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 4205
[ 0.000000] Kernel command line: ro init=/start.sh root=/dev/sda5 console=tty0 console=ttyS0 earlyprintk
[ 0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.000000] Sorting __ex_table...
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 12128K/17408K available (3777K kernel code, 284K rwdata, 820K rodata, 128K init, 111K bss, 5280K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=16, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 72
[ 0.000000] clocksource: via1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 2439823894983 ns
[ 0.020000] Console: colour dummy device 80x25
[ 0.080000] printk: console [tty0] enabled
[ 0.090000] printk: console [ttyS0] enabled
[ 0.090000] printk: console [ttyS0] enabled
[ 0.100000] printk: bootconsole [debug0] disabled
[ 0.100000] printk: bootconsole [debug0] disabled
[ 0.110000] Calibrating delay loop... 5.83 BogoMIPS (lpj=29184)
[ 0.260000] pid_max: default: 32768 minimum: 301
[ 0.290000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.300000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.420000] devtmpfs: initialized
[ 0.530000] random: get_random_u32 called from bucket_table_alloc.isra.27+0x70/0x1a6 with crng_init=0
[ 0.580000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.590000] futex hash table entries: 256 (order: -1, 3072 bytes, linear)
[ 0.630000] NET: Registered protocol family 16
[ 0.670000] DMA: preallocated 128 KiB GFP_KERNEL pool for atomic allocations
[ 0.690000] DMA: preallocated 128 KiB GFP_KERNEL|GFP_DMA pool for atomic allocations
[ 1.360000] NuBus: Scanning NuBus slots.
[ 1.550000] SCSI subsystem initialized
[ 1.630000] clocksource: Switched to clocksource via1
[ 2.370000] NET: Registered protocol family 2
[ 2.440000] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 2.450000] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 2.460000] TCP bind hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 2.480000] TCP: Hash tables configured (established 1024 bind 1024)
[ 2.500000] UDP hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 2.510000] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 2.530000] NET: Registered protocol family 1
[ 2.560000] random: fast init done
[ 2.580000] RPC: Registered named UNIX socket transport module.
[ 2.590000] RPC: Registered udp transport module.
[ 2.600000] RPC: Registered tcp transport module.
[ 2.610000] RPC: Registered tcp NFSv4.1 backchannel transport module.
[ 2.690000] workingset: timestamp_bits=30 max_order=12 bucket_order=0
[ 3.940000] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 253)
[ 3.950000] io scheduler mq-deadline registered
[ 3.990000] macfb: framebuffer at 0xfee00020, mapped to 0x(ptrval), size 480k
[ 4.000000] macfb: mode is 640x480x8, linelength=1024
[ 4.370000] Console: switching to colour frame buffer device 80x30
[ 4.690000] fb0: Toby frame buffer device
[ 4.710000] pmac_zilog: 0.6 (Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>)
[ 4.720000] scc.0: ttyS0 at MMIO 0x50f04002 (irq = 4, base_baud = 230400) is a Z85c30 ESCC - Serial port
[ 4.760000] scc.1: ttyS1 at MMIO 0x50f04000 (irq = 4, base_baud = 230400) is a Z85c30 ESCC - Serial port
[ 4.800000] Non-volatile memory driver v1.3
[ 4.820000] SWIM floppy driver Version 0.2 (2008-10-30)
[ 5.070000] brd: module loaded
[ 5.080000] adb: Mac II ADB Driver v1.0 for Unified ADB
[ 5.110000] Uniform Multi-Platform E-IDE driver
[ 5.130000] ide-gd driver 1.18
[ 5.460000] scsi host0: Macintosh NCR5380 SCSI, irq 19, io_port 0x0, base 0x50010000, can_queue 16, cmd_per_lun 2, sg_tablesize 1, this_id 7, flags { }
[ 5.530000] scsi 0:0:0:0: Direct-Access codesrc SCSI2SD 4.2 PQ: 0 ANSI: 2 CCS
[ 5.760000] Detected ADB keyboard, type ANSI.
[ 5.800000] input: ADB keyboard as /devices/virtual/input/input0
[ 5.980000] input: ADB mouse as /devices/virtual/input/input1
[ 6.150000] scsi 0:0:3:0: CD-ROM PIONEER CD-ROM DR-124X 1.05 PQ: 0 ANSI: 2
[ 7.070000] sd 0:0:0:0: [sda] 60556288 512-byte logical blocks: (31.0 GB/28.9 GiB)
[ 7.080000] sr 0:0:3:0: [sr0] scsi3-mmc drive: 4x/4x xa/form2 cdda tray
[ 7.090000] cdrom: Uniform CD-ROM driver Revision: 3.20
[ 7.110000] sd 0:0:0:0: [sda] Write Protect is off
[ 7.150000] sd 0:0:0:0: [sda] Cache data unavailable
[ 7.160000] sd 0:0:0:0: [sda] Assuming drive cache: write through
[ 7.290000] sd 0:0:0:0: Attached scsi generic sg0 type 0
[ 7.340000] sda: [mac] sda1 sda2 sda3 sda4 sda5 sda6 sda7 sda8 sda9
[ 7.370000] sr 0:0:3:0: Attached scsi generic sg1 type 5
[ 7.390000] mac8390 slot.D: Memory length resource not found, probing
[ 7.400000] mac8390 slot.D: MacCon Ethernet (type asante)
[ 7.410000] mac8390 slot.D: MAC 00:00:94:21:84:9a, IRQ 60, 32 KB shared memory at 0xfddd0000, 16-bit access.
[ 7.750000] aoe: AoE v85 initialised.
[ 7.780000] sd 0:0:0:0: [sda] Attached SCSI disk
[ 7.820000] mousedev: PS/2 mouse device common for all mice
[ 7.870000] rtc-generic rtc-generic: registered as rtc0
[ 7.910000] NET: Registered protocol family 17
[ 7.930000] printk: bootconsole [debug0] disabled
[ 7.990000] EXT4-fs (sda5): mounting ext3 file system using the ext4 subsystem
[ 8.830000] EXT4-fs (sda5): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled.
[ 8.860000] VFS: Mounted root (ext3 filesystem) readonly on device 8:5.
[ 8.880000] Freeing unused kernel memory: 128K
[ 8.890000] This architecture does not have kernel memory protection.
[ 8.910000] Run /start.sh as init process
[ 20.830000] random: crng init done
# cat /proc/meminfo
MemTotal: 12256 kB
MemFree: 2636 kB
MemAvailable: 8652 kB
Buffers: 2592 kB
Cached: 4508 kB
SwapCached: 0 kB
Active: 4884 kB
Inactive: 2352 kB
Active(anon): 8 kB
Inactive(anon): 124 kB
Active(file): 4876 kB
Inactive(file): 2228 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 152 kB
Mapped: 1200 kB
Shmem: 0 kB
KReclaimable: 232 kB
Slab: 1680 kB
SReclaimable: 232 kB
SUnreclaim: 1448 kB
KernelStack: 256 kB
PageTables: 4 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 6128 kB
Committed_AS: 800 kB
VmallocTotal: 3334144 kB
VmallocUsed: 64 kB
VmallocChunk: 0 kB
Percpu: 32 kB
# reboot -f
[ 66.740000] reboot: Restarting system
--
Sincerely yours,
Mike.
