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Yay! Fedora 23 on BeagleBone Black

Before you run dnf update, make sure you have vm.min_free_kbytes = 8192 in your /etc/sysctl.d/30-smsc.conf

Otherwise you will get:

[ 1977.215963] mmcqd/0: page allocation failure: order:4, mode:0xc020

And if you plow through, eventually you'll get

[rye@bb ~]$ dmesg
Segmentation fault (core dumped)

And then the system will not boot. Well, based on my experience the system will not boot anyway after upgrade, so the post will be continuously updated until I get the system to boot after full update.

Now, it is still slightly stupid to require a physical display to configure timezone, etc. before starting the SSH server, but once you're done...

/galleries/dropbox/fedora-23-beaglebone.png

Cockpit Management Console showing CPU pegged by dnf update before everything collapsed.

dmesg during update without vm.min_free_kbytes workaround:

[ 1977.215963] mmcqd/0: page allocation failure: order:4, mode:0xc020
[ 1977.216205] CPU: 0 PID: 552 Comm: mmcqd/0 Not tainted 4.2.3-300.fc23.armv7hl #1
[ 1977.216397] Hardware name: Generic AM33XX (Flattened Device Tree)
[ 1977.216620] [<c02184b0>] (unwind_backtrace) from [<c0213584>] (show_stack+0x18/0x1c)
[ 1977.216848] [<c0213584>] (show_stack) from [<c08d71d0>] (dump_stack+0x74/0x90)
[ 1977.217059] [<c08d71d0>] (dump_stack) from [<c03307a4>] (warn_alloc_failed+0xf0/0x11c)
[ 1977.217293] [<c03307a4>] (warn_alloc_failed) from [<c0333bb4>] (__alloc_pages_nodemask+0x7a8/0x850)
[ 1977.217533] [<c0333bb4>] (__alloc_pages_nodemask) from [<c0333ea0>] (alloc_kmem_pages+0x68/0xfc)
[ 1977.217777] [<c0333ea0>] (alloc_kmem_pages) from [<c034c02c>] (kmalloc_order+0x18/0x28)
[ 1977.217999] [<c034c02c>] (kmalloc_order) from [<c034c05c>] (kmalloc_order_trace+0x20/0x80)
[ 1977.218233] [<c034c05c>] (kmalloc_order_trace) from [<c05b6c30>] (edma_prep_slave_sg+0xc8/0x284)
[ 1977.218698] [<c05b6c30>] (edma_prep_slave_sg) from [<bf0da948>] (omap_hsmmc_request+0x368/0x470 [omap_hsmmc])
[ 1977.219158] [<bf0da948>] (omap_hsmmc_request [omap_hsmmc]) from [<bf074fe0>] (mmc_start_request+0x234/0x274 [mmc_core])
[ 1977.219591] [<bf074fe0>] (mmc_start_request [mmc_core]) from [<bf07609c>] (mmc_start_req+0x2a8/0x32c [mmc_core])
[ 1977.219961] [<bf07609c>] (mmc_start_req [mmc_core]) from [<bf13e2e0>] (mmc_blk_issue_rw_rq+0x414/0xa04 [mmc_block])
[ 1977.220271] [<bf13e2e0>] (mmc_blk_issue_rw_rq [mmc_block]) from [<bf13ecb8>] (mmc_blk_issue_rq+0x3e8/0x454 [mmc_block])
[ 1977.220572] [<bf13ecb8>] (mmc_blk_issue_rq [mmc_block]) from [<bf13f460>] (mmc_queue_thread+0xd4/0x168 [mmc_block])
[ 1977.220857] [<bf13f460>] (mmc_queue_thread [mmc_block]) from [<c02669c4>] (kthread+0xe0/0xf4)
[ 1977.221106] [<c02669c4>] (kthread) from [<c020fa08>] (ret_from_fork+0x14/0x2c)
[ 1977.221303] Mem-Info:
[ 1977.221400] active_anon:11857 inactive_anon:20158 isolated_anon:0
                active_file:33763 inactive_file:34101 isolated_file:0
                unevictable:0 dirty:2050 writeback:6891 unstable:0
                slab_reclaimable:7612 slab_unreclaimable:8511
                mapped:5559 shmem:40 pagetables:426 bounce:0
                free:2845 free_pcp:59 free_cma:1714
[ 1977.222246] DMA free:11380kB min:2840kB low:3548kB high:4260kB active_anon:47428kB inactive_anon:80632kB active_file:135052kB inactive_file:136404kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:523264kB managed:505504kB mlocked:0kB dirty:8200kB writeback:27564kB mapped:22236kB shmem:160kB slab_reclaimable:30448kB slab_unreclaimable:34044kB kernel_stack:872kB pagetables:1704kB unstable:0kB bounce:0kB free_pcp:236kB local_pcp:236kB free_cma:6856kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? no
[ 1977.223302] lowmem_reserve[]: 0 0 0 0
[ 1977.223563] DMA: 589*4kB (UMC) 470*8kB (UEMC) 185*16kB (UEMC) 60*32kB (UMC) 4*64kB (C) 1*128kB (C) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB 0*8192kB = 11380kB
[ 1977.224197] 68043 total pagecache pages
[ 1977.224311] 139 pages in swap cache
[ 1977.224413] Swap cache stats: add 1364, delete 1225, find 105/161
[ 1977.224568] Free swap  = 495356kB
[ 1977.224660] Total swap = 500236kB
[ 1977.224753] 130816 pages RAM
[ 1977.224838] 0 pages HighMem/MovableOnly
[ 1977.224940] 344 pages reserved
[ 1977.225026] 4096 pages cma reserved
[ 1977.225143] edma-dma-engine edma-dma-engine.0: edma_prep_slave_sg: Failed to allocate a descriptor
[ 1977.225377] omap_hsmmc 48060000.mmc: prep_slave_sg() failed
[ 1977.225528] omap_hsmmc 48060000.mmc: MMC start dma failure
[ 1977.227260] mmcblk0: unknown error -1 sending read/write command, card status 0x900
[ 1977.277269] mmc0: tried to reset card
[ 1977.284137] mmcqd/0: page allocation failure: order:4, mode:0xc020

See LP#746137 for more information, but now I can do full update without mmc issues.

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