Debugging memory allocation

[Adrian M. <ad...@ne...>]

I don't know if this is just G2 flakiness, but if I start playing sound
and then start hotplugging devices then I will sometimes get this sort
of oops (these don't down the system but they can make it unstable) -
any clues as to what might be the issue (these are now quite old -rc2?
kernels...)... just wondering if anybody can see anything obvious?

[   95.916012] Maple bus detaching at (0, 2)
[   96.208858] Unable to handle kernel paging request at virtual address
dfff0800
[   96.215707] pc = 8c00e480
[   96.218317] *pde = 00000000
[   96.221194] Oops: 0001 [#1]
[   96.224005] Modules linked in: snd_aica snd_pcm_oss snd_pcm snd_timer
snd_page_alloc snd_mixer_oss snd soundcore maple_keyb
[   96.235500] 
[   96.237035] Pid : 1842, Comm:                    [
[   96.241993] PC is at __copy_user_page+0x28/0x54
[   96.246651] PC  : 8c00e480 SP  : 8c49fc3c SR  : 40008100 TEA :
c0003ba4    Not tainted
[   96.254821] R0  : 00000000 R1  : 00000002 R2  : 00000000 R3  :
00000000
[   96.261648] R4  : 00000000 R5  : 00000001 R6  : 00000000 R7  :
00000000
[   96.268481] R8  : 8c28f000 R9  : 8cb9f820 R10 : dfff0800 R11 :
8c28e820
[   96.275303] R12 : 8c28e000 R13 : 8c2b2000 R14 : 00489a20
[   96.280782] MACH: 00000000 MACL: 00000000 GBR : 00000000 PR  :
8c00eed0
[   96.287599] 
[   96.287613] Call trace: 
[   96.291747] [<8c056e5c>] __do_fault+0x29c/0x540
[   96.296412] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.301536] [<8c291dfc>] ip_fib_init+0x3c/0xe0
[   96.306120] [<8c059be4>] handle_mm_fault+0x144/0x820
[   96.311257] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.316355] [<8c00e004>] do_page_fault+0x84/0x3c0
[   96.321201] [<8c292a34>] ip_auto_config+0x454/0x1000
[   96.326320] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.331452] [<8c04dc8e>] __alloc_pages+0x4e/0x340
[   96.336299] [<8c055458>] vma_prio_tree_insert+0x18/0x60
[   96.341685] [<8c291e90>] ip_fib_init+0xd0/0xe0
[   96.346257] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.351383] [<8c05d26a>] vma_link+0xaa/0x1c0
[   96.355784] [<8c05de76>] mmap_region+0x576/0x5e0
[   96.360542] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.365676] [<8c291dfc>] ip_fib_init+0x3c/0xe0
[   96.370246] [<8c05c6dc>] __vma_link+0x1c/0x80
[   96.374731] [<8c0080dc>] ret_from_exception+0x0/0x8
[   96.379772] [<8c0080dc>] ret_from_exception+0x0/0x8
[   96.384834] [<8c00e39c>] __clear_user+0x30/0x74
[   96.389461] [<8c0aba3a>] padzero+0x3a/0x60
[   96.393699] [<8c0ad12a>] load_elf_binary+0x98a/0x1840
[   96.398899] [<8c01062c>] update_curr_load+0x6c/0xa0
[   96.403932] [<8c013406>] try_to_wake_up+0xc6/0xe0
[   96.408834] [<8c206d00>] schedule+0x1c0/0x600
[   96.413287] [<8c206c0a>] schedule+0xca/0x600
[   96.417669] [<8c00deae>] __do_page_fault+0xce/0x1a0
[   96.422700] [<8c057ece>] follow_page+0x20e/0x340
[   96.427460] [<8c05a594>] get_user_pages+0x2d4/0x400
[   96.432486] [<8c059aa0>] handle_mm_fault+0x0/0x820
[   96.437426] [<8c057cc0>] follow_page+0x0/0x340
[   96.442007] [<8c292a00>] ip_auto_config+0x420/0x1000
[   96.447157] [<8c076970>] get_arg_page+0x30/0xa0
[   96.451816] [<8c076de2>] search_binary_handler+0xc2/0x340
[   96.457375] [<8c0ac7a0>] load_elf_binary+0x0/0x1840
[   96.462419] [<8c078f5c>] do_execve+0x15c/0x1c0
[   96.466984] [<8c076b20>] copy_strings+0x0/0x1e0
[   96.471662] [<8c003e0e>] sys_execve+0x2e/0xa0
[   96.476157] [<8c008238>] syscall_call+0xc/0x10
[   96.480729] [<8c003de0>] sys_execve+0x0/0xa0
[   96.485174] 
[   96.486654] Process: [ (pid: 1842, stack limit = 8c49e001)
[   96.492313] Stack: (0x8c49fc3c to 0x8c4a0000)
[   96.496797] fc20:
dfff0000 
[   96.505329] fc40: 8cb9f000 00000000 0cb9f000 8c056e5c 00000001
8c49fc70 8c292a00 8c94e470 
[   96.513862] fc60: 8c2c93e0 8c49e000 8c2c88e0 8c291dfc 00000001
00000079 00489000 8c2b71c0 
[   96.522395] fc80: 00000200 8c059be4 8c94e470 00489a20 8c9a9004
8cb47224 00000000 00000224 
[   96.530928] fca0: 8c49e000 8c9a9004 00000079 00000001 00000000
00000001 8c292a00 00000000 
[   96.539461] fcc0: 8c26f3ec 8c49e000 8c00e004 00000001 8c292a34
00489a20 8c292a00 8c49fd8c 
[   96.547994] fce0: 8c94e470 8c9b34a0 8c49e000 00000000 00000001
8c04dc8e 00000079 00000079 
[   96.556527] fd00: 00000079 00000079 8c055458 8c978cc0 8c94e4b0
00000001 8c291e90 8c292a00 
[   96.565061] fd20: 8c94e494 8c94e470 8c05d26a 8c94e4b0 8c94e470
8c05de76 8c94e470 8c292a00 
[   96.573594] fd40: 00001000 00489000 8c97ee60 8c49fd30 00001812
00000001 00000001 8c291dfc 
[   96.582127] fd60: 00000079 8c97ee60 8c05c6dc 8c0080dc 8ca75840
00489a20 8c49ffa0 00000000 
[   96.590660] fd80: 8c0080dc 00489a20 00000001 00000000 ffffffe0
00489a20 0048a000 00489a20 
[   96.599193] fda0: 000005e0 00000000 00000000 004a6630 8c34f3a0
8c4cec00 00000000 8c49ffa0 
[   96.607726] fdc0: 00489a20 8ca75840 8c49fdec 8c00e39c 8c0aba3a
40008101 00000000 00000000 
[   96.616259] fde0: 00000000 ffffffff 00000060 8c0ad12a 8c49fe0c
00000003 8c01062c 8c49fe08 
[   96.624792] fe00: 8c4cec2c 8c34f41c 8c013406 8ca75800 00000003
00000000 00000000 00400000 
[   96.633325] fe20: 00000000 00000001 00000000 00000000 00489a20
004a6630 00000003 8c2e7034 
[   96.641858] fe40: 8c2e7034 00400000 00478fe8 00489000 00489a20
00000000 00000002 8c49e000 
[   96.650391] fe60: 8c49fe64 00000fb4 00004f42 8c49fe70 8c206d00
8cd4f4fc 8c9b3298 8c49fea0 
[   96.658924] fe80: ffffff0f 8c49e000 00400000 00478fe8 00489000
00489a20 8c206c0a 00000000 
[   96.667458] fea0: 8c00deae 8cd8829c 8c057ece 00000002 8c05a594
8c059aa0 8c057cc0 8c292a00 
[   96.675991] fec0: 8c9b35dc 8c49feb0 00000007 8c981b54 8c9b34a0
00000030 00000001 00000022 
[   96.684524] fee0: 00000000 8c49ff20 00000001 7bffff48 8c076970
004a75d6 8ca75868 00000003 
[   96.693057] ff00: 00000002 8c34f41c 00000001 8c49e000 8c076de2
8c49e000 ffffff0f 8c34f3a0 
[   96.701590] ff20: 8c0ac7a0 8c49e000 00000000 8c26fd84 8c34f41c
8c49ffa0 00000000 fffffffe 
[   96.710123] ff40: 8c49e000 8c49e000 8c078f5c 8c49ffa0 004a75e4
8c076b20 8c34f3a0 8c34f41c 
[   96.718656] ff60: 00000000 00000013 8c34f45c 8c003e0e 7b800a64
00000000 00489964 8cb86000 
[   96.727189] ff80: 8c49ffa0 004a75fc 8cb86000 8c008238 ffffff0f
00000001 8c49fff8 8c003de0 
[   96.735722] ffa0: 0000000b 0042ac64 00489428 0000000b 004a762c
004a75e4 004a75fc 01010101 
[   96.744255] ffc0: 004a75e4 004a762c 00000001 004a75fc 00489964
00000000 7b800a64 7b800a64 
[   96.752789] ffe0: 004473f6 0042ac86 00008001 00000000 00000031
000005ef 0000004c 00000160 
[   96.761757] note: [[1842] exited with preempt_count 3
[   96.766807] BUG: scheduling while atomic: [/0x10000004/1842
[   96.772407] Stack: (0x8c49fa74 to 0x8c4a0000)
[   96.776846] fa60:
8c206fce 10000000 8c9b35d8 
[   96.785357] fa80: 8c0118da 8c05dee0 7b995000 8c0118da 8c49faac
00000000 8c2f05c0 8c2f05c8 
[   96.793841] faa0: 8c206b40 10000000 8c49e000 8c2072b8 8c49fac0
00000000 00000000 0000000f 
[   96.802373] fac0: 8c019afc ffffff0f 8c01b68a 8c26b3d4 00000001
0000000b 00000001 8c017ec0 
[   96.810954] fae0: 8c9b34a0 8c2f05c0 00000001 8c9b351c 8c125840
00000001 8c49fb1c 8c006d8c 
[   96.819440] fb00: 00000001 8c125840 8c238e04 00000001 8c49e000
8c49fbdc 8c49e000 8c00e1e4 
[   96.827973] fb20: 8c2b2000 dfff0800 8c292a00 8c49fbdc 8c017ec0
00000000 8c49fb7c 8c49e000 
[   96.836506] fb40: c0022500 8c26a86c 8c49fb6c 8c022122 fffce728
8c49fb44 8cbdf684 00000104 
[   96.845039] fb60: 00000000 8c022416 8c49e000 8c49fb7c 8c49fb44
8c29e520 00000104 8c49fb7c 
[   96.853572] fb80: 8c49fb7c 8c01deba 00489a20 8c29f5d8 00000001
8c29e300 0000000a 8c29e34c 
[   96.862105] fba0: 00000000 8c01dfa6 8c2b2000 8c28e000 8c28e804
00000000 8c2a2590 8c0080dc 
[   96.870638] fbc0: 00489a20 8c2b2000 8c28e000 8c28e820 8c0080dc
dfff0800 00000001 00000000 
[   96.879171] fbe0: 00000002 00000000 00000000 00000000 00000001
00000000 00000000 8c28f000 
[   96.887704] fc00: 8cb9f820 dfff0800 8c28e820 8c28e000 8c2b2000
00489a20 8c49fc3c 8c00e480 
[   96.896237] fc20: 8c00eed0 40008100 00000000 00000000 00000000
ffffffff 00000060 dfff0000 
[   96.904816] fc40: 8cb9f000 00000000 0cb9f000 8c056e5c 00000001
8c49fc70 8c292a00 8c94e470 
[   96.913304] fc60: 8c2c93e0 8c49e000 8c2c88e0 8c291dfc 00000001
00000079 00489000 8c2b71c0 
[   96.921837] fc80: 00000200 8c059be4 8c94e470 00489a20 8c9a9004
8cb47224 00000000 00000224 
[   96.930415] fca0: 8c49e000 8c9a9004 00000079 00000001 00000000
00000001 8c292a00 00000000 
[   96.938903] fcc0: 8c26f3ec 8c49e000 8c00e004 00000001 8c292a34
00489a20 8c292a00 8c49fd8c 
[   96.947436] fce0: 8c94e470 8c9b34a0 8c49e000 00000000 00000001
8c04dc8e 00000079 00000079 
[   96.956015] fd00: 00000079 00000079 8c055458 8c978cc0 8c94e4b0
00000001 8c291e90 8c292a00 
[   96.964502] fd20: 8c94e494 8c94e470 8c05d26a 8c94e4b0 8c94e470
8c05de76 8c94e470 8c292a00 
[   96.973035] fd40: 00001000 00489000 8c97ee60 8c49fd30 00001812
00000001 00000001 8c291dfc 
[   96.981568] fd60: 00000079 8c97ee60 8c05c6dc 8c0080dc 8ca75840
00489a20 8c49ffa0 00000000 
[   96.990102] fd80: 8c0080dc 00489a20 00000001 00000000 ffffffe0
00489a20 0048a000 00489a20 
[   96.998634] fda0: 000005e0 00000000 00000000 004a6630 8c34f3a0
8c4cec00 00000000 8c49ffa0 
[   97.007168] fdc0: 00489a20 8ca75840 8c49fdec 8c00e39c 8c0aba3a
40008101 00000000 00000000 
[   97.015702] fde0: 00000000 ffffffff 00000060 8c0ad12a 8c49fe0c
00000003 8c01062c 8c49fe08 
[   97.024280] fe00: 8c4cec2c 8c34f41c 8c013406 8ca75800 00000003
00000000 00000000 00400000 
[   97.032768] fe20: 00000000 00000001 00000000 00000000 00489a20
004a6630 00000003 8c2e7034 
[   97.041300] fe40: 8c2e7034 00400000 00478fe8 00489000 00489a20
00000000 00000002 8c49e000 
[   97.049880] fe60: 8c49fe64 00000fb4 00004f42 8c49fe70 8c206d00
8cd4f4fc 8c9b3298 8c49fea0 
[   97.058366] fe80: ffffff0f 8c49e000 00400000 00478fe8 00489000
00489a20 8c206c0a 00000000 
[   97.066899] fea0: 8c00deae 8cd8829c 8c057ece 00000002 8c05a594
8c059aa0 8c057cc0 8c292a00 
[   97.075478] fec0: 8c9b35dc 8c49feb0 00000007 8c981b54 8c9b34a0
00000030 00000001 00000022 
[   97.083965] fee0: 00000000 8c49ff20 00000001 7bffff48 8c076970
004a75d6 8ca75868 00000003 
[   97.092499] ff00: 00000002 8c34f41c 00000001 8c49e000 8c076de2
8c49e000 ffffff0f 8c34f3a0 
[   97.101032] ff20: 8c0ac7a0 8c49e000 00000000 8c26fd84 8c34f41c
8c49ffa0 00000000 fffffffe 
[   97.109565] ff40: 8c49e000 8c49e000 8c078f5c 8c49ffa0 004a75e4
8c076b20 8c34f3a0 8c34f41c 
[   97.118098] ff60: 00000000 00000013 8c34f45c 8c003e0e 7b800a64
00000000 00489964 8cb86000 
[   97.126646] ff80: 8c49ffa0 004a75fc 8cb86000 8c008238 ffffff0f
00000001 8c49fff8 8c003de0 
[   97.135164] ffa0: 0000000b 0042ac64 00489428 0000000b 004a762c
004a75e4 004a75fc 01010101 
[   97.143698] ffc0: 004a75e4 004a762c 00000001 004a75fc 00489964
00000000 7b800a64 7b800a64 
[   97.152230] ffe0: 004473f6 0042ac86 00008001 00000000 00000031
000005ef 0000004c 00000160 
[   97.160759] 
[   97.160777] Call trace: 
[   97.164908] [<8c0118da>] __cond_resched+0x1a/0x40
[   97.169799] [<8c05dee0>] unlink_file_vma+0x0/0x60
[   97.174654] [<8c0118da>] __cond_resched+0x1a/0x40
[   97.179513] [<8c206b40>] schedule+0x0/0x600
[   97.183834] [<8c2072b8>] cond_resched+0x38/0x60
[   97.188491] [<8c019afc>] put_files_struct+0xfc/0x160
[   97.193628] [<8c01b68a>] do_exit+0x16a/0xbc0
[   97.198013] [<8c017ec0>] printk+0x0/0x40
[   97.202057] [<8c125840>] bust_spinlocks+0x0/0x40
[   97.206812] [<8c006d8c>] die+0x16c/0x1e0
[   97.210873] [<8c125840>] bust_spinlocks+0x0/0x40
[   97.215624] [<8c00e1e4>] do_page_fault+0x264/0x3c0
[   97.220557] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.225671] [<8c017ec0>] printk+0x0/0x40
[   97.229719] [<c0022500>] aica_period_elapsed+0x0/0x100 [snd_aica]
[   97.236023] [<8c022122>] __mod_timer+0x22/0x140
[   97.240681] [<8c022416>] run_timer_softirq+0x176/0x200
[   97.246009] [<8c01deba>] __do_softirq+0x5a/0xe0
[   97.250676] [<8c01dfa6>] do_softirq+0x66/0xa0
[   97.255136] [<8c28e000>] kbd_init+0x60/0x120
[   97.259530] [<8c28e804>] serial_console_setup+0x24/0x160
[   97.265021] [<8c0080dc>] ret_from_exception+0x0/0x8
[   97.270048] [<8c28e000>] kbd_init+0x60/0x120
[   97.274439] [<8c28e820>] serial_console_setup+0x40/0x160
[   97.279922] [<8c0080dc>] ret_from_exception+0x0/0x8
[   97.284995] [<8c28f000>] serio_init+0x80/0xc0
[   97.289447] [<8c28e820>] serial_console_setup+0x40/0x160
[   97.294940] [<8c28e000>] kbd_init+0x60/0x120
[   97.299347] [<8c00e480>] __copy_user_page+0x28/0x54
[   97.304351] [<8c00eed0>] copy_user_page+0xb0/0x160
[   97.309318] [<8c056e5c>] __do_fault+0x29c/0x540
[   97.313970] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.319095] [<8c291dfc>] ip_fib_init+0x3c/0xe0
[   97.323676] [<8c059be4>] handle_mm_fault+0x144/0x820
[   97.328835] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.333933] [<8c00e004>] do_page_fault+0x84/0x3c0
[   97.338761] [<8c292a34>] ip_auto_config+0x454/0x1000
[   97.343932] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.349012] [<8c04dc8e>] __alloc_pages+0x4e/0x340
[   97.353861] [<8c055458>] vma_prio_tree_insert+0x18/0x60
[   97.359246] [<8c291e90>] ip_fib_init+0xd0/0xe0
[   97.363817] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.368941] [<8c05d26a>] vma_link+0xaa/0x1c0
[   97.373341] [<8c05de76>] mmap_region+0x576/0x5e0
[   97.378117] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.383251] [<8c291dfc>] ip_fib_init+0x3c/0xe0
[   97.387803] [<8c05c6dc>] __vma_link+0x1c/0x80
[   97.392287] [<8c0080dc>] ret_from_exception+0x0/0x8
[   97.397332] [<8c0080dc>] ret_from_exception+0x0/0x8
[   97.402393] [<8c00e39c>] __clear_user+0x30/0x74
[   97.407018] [<8c0aba3a>] padzero+0x3a/0x60
[   97.411274] [<8c0ad12a>] load_elf_binary+0x98a/0x1840
[   97.416473] [<8c01062c>] update_curr_load+0x6c/0xa0
[   97.421489] [<8c013406>] try_to_wake_up+0xc6/0xe0
[   97.426391] [<8c206d00>] schedule+0x1c0/0x600
[   97.430844] [<8c206c0a>] schedule+0xca/0x600
[   97.435227] [<8c00deae>] __do_page_fault+0xce/0x1a0
[   97.440260] [<8c057ece>] follow_page+0x20e/0x340
[   97.445040] [<8c05a594>] get_user_pages+0x2d4/0x400
[   97.450064] [<8c059aa0>] handle_mm_fault+0x0/0x820
[   97.454986] [<8c057cc0>] follow_page+0x0/0x340
[   97.459566] [<8c292a00>] ip_auto_config+0x420/0x1000
[   97.464714] [<8c076970>] get_arg_page+0x30/0xa0
[   97.469376] [<8c076de2>] search_binary_handler+0xc2/0x340
[   97.474932] [<8c0ac7a0>] load_elf_binary+0x0/0x1840
[   97.479978] [<8c078f5c>] do_execve+0x15c/0x1c0
[   97.484556] [<8c076b20>] copy_strings+0x0/0x1e0
[   97.489217] [<8c003e0e>] sys_execve+0x2e/0xa0
[   97.493732] [<8c008238>] syscall_call+0xc/0x10
[   97.498286] [<8c003de0>] sys_execve+0x0/0xa0
[   97.502730] 

/ # 
/ # [  137.252206] Maple bus at (0, 2): Connected function 0x10
[  137.261634] No maple driver found for this device
[  138.156855] Maple bus detaching at (0, 2)