[FS#3278] malta: memory allocation failure during boot

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - Tony Ambardar (guidosarducci) 

Attached to Project - OpenWrt/LEDE Project
Summary - malta: memory allocation failure during boot
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Medium
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - The problem is observed on all booting malta subtargets, built from current master and using the default 5.4 kernel and config options. During boot the built-in SCSI CDROM support will fail ("out of memory") during its probe.

Sample log file:

[    1.009668] ata2.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
[    1.023561] scsi 1:0:0:0: CD-ROM            QEMU     QEMU DVD-ROM     2.5+ PQ: 0 ANSI: 5
[    1.037871] kworker/u2:3: page allocation failure: order:0, mode:0xcc1(GFP_KERNEL|GFP_DMA), nodemask=(null),cpuset=/,mems_allowed=0
[    1.038594] CPU: 0 PID: 90 Comm: kworker/u2:3 Not tainted 5.4.52 #0
[    1.039141] Workqueue: events_unbound async_run_entry_fn
[    1.039481] Stack : 0000000000000000 0000000000000001 d443da66b6c08100 d443da66b6c08100
[    1.039936]         0000000000000000 900000009fb2f4d0 ffffffffffffff64 ffffffff804b8360
[    1.040330]         000000000000009c 3a206576656e7473 5f756e626f756e64 206173796e635f72
[    1.040802]         ffffffffffffffff 0000000000000010 0000000000000000 0000000000000000
[    1.041179]         0000000000000000 0000000000000000 ffffffff808b0000 ffffffff80890000
[    1.041582]         0000000000000240 0000000000000240 900000009fb2f818 0000000000000000
[    1.041983]         0000000000000003 ffffffff804b74f0 0000000000000000 ffffffff81dc0000
[    1.042380]         900000009fb2c000 900000009fb2f4d0 0000000000000cc1 ffffffff806d8104
[    1.042776]         0000000000000000 6e626f756e640000 0000000000000000 d443da66b6c08100
[    1.043174]         0000000000000001 ffffffff8010b0e4 0000000000000001 ffffffff806d8104
[    1.043592]         ...
[    1.043881] Call Trace:
[    1.044100] [] show_stack+0x34/0x108
[    1.044780] [] dump_stack+0x9c/0xd8
[    1.045218] [] warn_alloc+0xcc/0x148
[    1.045619] [] __alloc_pages_slowpath+0xcd0/0xdb8
[    1.045964] [] __alloc_pages_nodemask+0x290/0x2d0
[    1.046319] [] new_slab+0x33c/0xd18
[    1.046644] [] ___slab_alloc.isra.92.constprop.97+0x2cc/0x4d0
[    1.047023] [] __slab_alloc.isra.93.constprop.96+0x20/0x48
[    1.047426] [] kmem_cache_alloc+0x1e8/0x2b0
[    1.047838] [] sr_probe+0x1e4/0x6f0
[    1.048127] [] really_probe+0xf8/0x350
[    1.048409] [] bus_for_each_drv+0x70/0xb0
[    1.048711] [] __device_attach+0xe0/0x120
[    1.049004] [] bus_probe_device+0xa0/0xc0
[    1.049296] [] device_add+0x410/0x638
[    1.049577] [] scsi_sysfs_add_sdev+0x60/0x280
[    1.049893] [] scsi_probe_and_add_lun+0x96c/0xce8
[    1.050212] [] __scsi_add_device+0x120/0x178
[    1.050661] [] ata_scsi_scan_host+0xb8/0x2c0
[    1.051134] [] async_run_entry_fn+0x50/0x130
[    1.051576] [] process_one_work+0x250/0x4a8
[    1.051869] [] worker_thread+0x16c/0x610
[    1.052158] [] kthread+0x138/0x140
[    1.052447] [] ret_from_kernel_thread+0x14/0x1c
[    1.053276] Mem-Info:
[    1.053604] active_anon:0 inactive_anon:6244 isolated_anon:0
[    1.053604]  active_file:0 inactive_file:0 isolated_file:0
[    1.053604]  unevictable:0 dirty:0 writeback:0 unstable:0
[    1.053604]  slab_reclaimable:185 slab_unreclaimable:1174
[    1.053604]  mapped:0 shmem:6244 pagetables:0 bounce:0
[    1.053604]  free:104901 free_pcp:33 free_cma:0
[    1.054876] Node 0 active_anon:0kB inactive_anon:24976kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:24976kB writeback_tmp:0kB unstable:0kB all_unreclaimable? no
[    1.055882] DMA free:0kB min:0kB low:0kB high:0kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:16384kB managed:0kB mlocked:0kB kernel_stack:0kB pagetables:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
[    1.056908] lowmem_reserve[]: 0 441 441 441
[    1.057166] DMA32 free:419604kB min:2688kB low:3360kB high:4032kB active_anon:0kB inactive_anon:24976kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:507900kB managed:451736kB mlocked:0kB kernel_stack:512kB pagetables:0kB bounce:0kB free_pcp:132kB local_pcp:132kB free_cma:0kB
[    1.058190] lowmem_reserve[]: 0 0 0 0
[    1.058405] DMA: 0*4kB 0*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 0kB
[    1.058943] DMA32: 3*4kB (UME) 1*8kB (U) 7*16kB (UE) 9*32kB (UE) 4*64kB (UME) 3*128kB (UME) 1*256kB (U) 1*512kB (M) 2*1024kB (UE) 1*2048kB (E) 101*4096kB (M) = 419620kB
[    1.059733] 6244 total pagecache pages
[    1.059978] 0 pages in swap cache
[    1.060136] Swap cache stats: add 0, delete 0, find 0/0
[    1.060397] Free swap  = 0kB
[    1.060553] Total swap = 0kB
[    1.060757] 131071 pages RAM
[    1.060912] 0 pages HighMem/MovableOnly
[    1.061161] 18137 pages reserved
[    1.061524] sr 1:0:0:0: [sr0] out of memory.
[    1.061776] cdrom: Uniform CD-ROM driver Revision: 3.20
[    1.091522] Freeing unused kernel memory: 21544K


Based on the log, the //sr_probe// function fails to allocate memory from the low 16MB DMA_ZONE, which is exhausted. While on 32-bit targets the bootup continues and login is possible, there may still be related or follow-on memory problems. For example, malta/mipseb64 shows the same memory allocation failure, and then a subsequent SIGSEGV during //init// startup leads to a boot loop.

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3278

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