[Xenomai] Xenomai 3.0.5 - Segmentation fault in xnsynch_sleep_on();

Piotr Piorkowski qba100 at gmail.com
Fri Oct 27 16:16:14 CEST 2017


   [  239.267755] Unable to handle kernel NULL pointer dereference at
   virtual address 000000ec
   [  239.275860] pgd = af600000
   [  239.278568] [000000ec] *pgd=2a010831, *pte=00000000, *ppte=00000000
   [  239.284868] Internal error: Oops: 817 [#1] SMP ARM
   [  239.289660] Modules linked in: ads1256_rtdm(O+) fuse bluetooth
   brcmfmac brcmutil cfg80211 rfkill bcm2835_rng bcm2835_gpiomem
   uio_pdrv_genirq uio nfsd ip_tables x_tables ipv6 [last unloaded:
   ads1256_rtdm]
   [  239.307903] CPU: 2 PID: 1546 Comm: insmod Tainted: G           O
   4.1.21-xenomai-3.0.5 #44
   [  239.316341] Hardware name: BCM2709
   [  239.319745] task: af6ae780 ti: aa076000 task.ti: aa076000
   [  239.325156] PC is at xnsynch_sleep_on+0x1fc/0x210
   [  239.329865] LR is at ___xnlock_get+0x1c/0x80
   [  239.334140] pc : [<800f7d94>]    lr : [<800efc88>]    psr: 60000093
   [  239.334140] sp : aa0776d8  ip : aa0776c0  fp : aa077714
   [  239.345621] r10: 00000000  r9 : 8085fcd8  r8 : 8083a9a0
   [  239.350847] r7 : 8083a9a0  r6 : b98f8c34  r5 : 00000000  r4 :
   00000003
   [  239.357376] r3 : 000000ec  r2 : 00000001  r1 : 00000002  r0 :
   b98f8c44
   [  239.363908] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM
   Segment user
   [  239.371132] Control: 10c5383d  Table: 2f60006a  DAC: 00000015
   [  239.376879] Process insmod (pid: 1546, stack limit = 0xaa076220)
   [  239.382887] Stack: (0xaa0776d8 to 0xaa078000)
   [  239.387247] 76c0:
       bab76800 aa077720
   [  239.395433] 76e0: 00000000 00000000 808719a4 00000000 b98f8c34
   00000000 00000000 8083a9a0
   [  239.403618] 7700: 8085fcd8 00000000 aa07774c aa077718 80103ed8
   800f7ba4 00000000 800ca7c8
   [  239.411803] 7720: b997fd00 b98f8a50 00000000 00000063 af79f540
   00000000 00000000 af79f664
   [  239.419989] 7740: aa077764 aa077750 80103f90 80103d44 00000000
   aa077768 aa07777c aa077768
   [  239.428174] 7760: 804a4fe0 80103f70 00000002 00000000 aa077794
   aa077780 804a50dc 804a4f68
   [  239.436359] 7780: aa077dbc 00000000 aa077d8c aa077798 7f3ae128
   804a50b4 bab70010 00000000
   [  239.444544] 77a0: c831d5ca 00000004 800559c8 800566b0 af5df980
   bab7be00 0000cc9a 00000000
   [  239.452730] 77c0: 00004e20 00000000 0112a880 00000000 00000279
   bab7be00 800561d4 800563b8
   [  239.460916] 77e0: bab7be00 00000279 0002e7d0 bab7fb00 8047d7f4
   0002e7d0 aa077844 aa077808
   [  239.469101] 7800: 800921d8 8047d548 0005fa9b 00000000 ffffffff
   00ffffff aa077844 bab7bdc0
   [  239.477287] 7820: bab7c248 8085e940 ffffffb2 8085fcd8 00000006
   000000a0 aa077854 aa077848
   [  239.485472] 7840: 80055080 800921a8 bab7bdc0 00000000 aa077874
   aa077860 800b2ce0 8001da8c
   [  239.493658] 7860: 0000b9ff bab7bdc0 aa077884 aa077878 805a3204
   800b2cc8 aa0778fc aa077888
   [  239.501844] 7880: 8005ab88 805a31d4 00000000 aa076000 af6ae780
   bab824d8 0000009b 00000000
   [  239.510029] 78a0: ba49b780 00000003 00000028 ba49c400 8001d3b8
   8005b59c aa07790c aa0778c8
   [  239.518215] 78c0: 8005b59c 8001d3b0 00000000 00000000 a609e57b
   00000037 00000100 ba49c400
   [  239.526399] 78e0: 00009bfe aa0779a4 00000002 00000002 aa077938
   00000001 00000000 8083edc0
   [  239.534584] 7900: aa0779fc aa077910 8005b87c 80326cd0 00000002
   00000001 aa077960 00000001
   [  239.542770] 7920: 00000000 8083edc0 aa077a24 aa077938 8005b87c
   80326cd0 8085e940 00000000
   [  239.550955] 7940: 0000001d 8083edc0 ba49c400 00000000 8085fcd8
   0000001d 00026000 00000400
   [  239.559141] 7960: 0000001d 0000001d 0000001d 0000001d 00000400
   000000b9 00000001 00000000
   [  239.567326] 7980: 00000001 00000000 00000000 ba49c280 ba49c400
   000001fc 00001000 0000007f
   [  239.575512] 79a0: 00000131 00000131 00000131 00000098 00000400
   00000400 00000002 00000000
   [  239.583697] 79c0: 00000001 00000002 00000001 00000000 00000000
   00000000 00000000 00000400
   [  239.591883] 79e0: bab5ddc0 8083edc0 aa077a0c aa0779f8 aa029700
   aa077a74 00000020 00000002
   [  239.600068] 7a00: 80056a50 8005c314 00011ede 00000000 bab8ae00
   00000000 8ad439f4 00000003
   [  239.608253] 7a20: 800559c8 800566b0 af5dfa00 bab8ae00 000151a5
   00000000 00011ede 00000000
   [  239.616439] 7a40: aa077a8c aa077a50 800566b0 800559c0 00007e23
   00000000 bab8ae00 00000000
   [  239.624624] 7a60: 8ad4ce6a 00000003 800559c8 800566b0 af5dfa00
   bab8ae00 00009476 00000000
   [  239.632809] 7a80: 00007e23 00000000 aa077ad4 aa077a98 800566b0
   800559c0 af6ae7c8 af5c8780
   [  239.640994] 7aa0: bab8ae00 af5dfa00 00000000 00000000 8005663c
   80059df4 bab8ae00 af5dfa00
   [  239.649179] 7ac0: bab8ae00 ffffffff 8b5c3c8f 00000003 bab8adc0
   00000002 00000002 808d4330
   [  239.657365] 7ae0: bab8adc0 af6ae780 8085fcd8 00000003 8005afe8
   8005ce4c 0005fa9b 00000000
   [  239.665550] 7b00: 808630dc 00000002 ba4fa000 8000ab00 8000ab14
   80046434 8000ab00 ffffffff
   [  239.673735] 7b20: ba4fa000 00000002 00000000 00000000 af6aea68
   00000003 aa077b6c aa077b48
   [  239.681920] 7b40: 80046434 8000ab0c 808d3088 00000001 00000002
   00000000 aa077b7c aa077b68
   [  239.690106] 7b60: 800b2ce0 8001da8c 8083edc0 b9849880 aa077ba4
   aa077b80 8004c138 800b2cc8
   [  239.698291] 7b80: ba4cb980 bab8adc0 af495340 ba4cbf40 8083edc0
   af6aea68 aa077bf4 aa077ba8
   [  239.706477] 7ba0: 8059eeb0 8004c0cc 8004e1a0 805a31d4 7fffffff
   7fffffff 808d4330 00000002
   [  239.714662] 7bc0: 00000002 3a34c000 00000000 aa076000 7fffffff
   805a00cc aa077ce4 00000002
   [  239.722847] 7be0: bab79fc0 bab79fc0 aa077c14 aa077bf8 80024b30
   8001da8c bab79e90 bab79fc0
   [  239.731032] 7c00: bab79e90 7f3afdc8 808719a4 bab79fc0 00000000
   00000001 800efd00 800f61f4
   [  239.739218] 7c20: aa077c74 aa077c30 800f6144 8001da8c 00000001
   8083bba0 8092ad00 aa076000
   [  239.747404] 7c40: 00000001 8085fcd8 aa077c6c 8083ce90 8093f500
   8083ce90 8085fcd8 bab779a8
   [  239.755589] 7c60: 00000000 bab779a0 aa077c94 aa077c78 800f680c
   800f5d48 00000411 8093f500
   [  239.763775] 7c80: bab779b0 00000001 aa077ce4 aa077c98 800b2b08
   8001da8c 11d7affe 8083bb40
   [  239.771960] 7ca0: 8086ec14 8085fcd8 bab779a4 8092ad00 bab779a8
   00000000 aa077d6c bab779a0
   [  239.780146] 7cc0: 8093f500 8092ad00 80839800 8085fcd8 aa077d6c
   af79f664 aa077d0c aa077ce8
   [  239.788331] 7ce0: 800b2c7c 8001da8c 8083bb40 8085fcd8 8093f500
   8085fcd8 8083a9a0 aa077d6c
   [  239.796517] 7d00: aa077d2c aa077d10 800b3040 800b2c00 00000000
   8083a9a0 8083ce90 8085fcd8
   [  239.804702] 7d20: aa077d54 aa077d30 800f9da4 800b2f74 00000000
   7f3afdc8 7f3ae6dc 00000000
   [  239.812887] 7d40: 00000000 00000000 aa077da4 aa077d58 80104eec
   800f9b5c 00000000 8006e298
   [  239.821072] 7d60: 00007530 00000000 00000063 00000000 7f3ae6dc
   00000002 00000000 aa077dbc
   [  239.829258] 7d80: aa077da4 aa077d90 7f3ae210 7f3ae044 7f3af670
   00000000 aa077de4 aa077da8
   [  239.837443] 7da0: 7f3b20c4 7f3ae1ec 00000063 80841ff0 00007530
   00000000 00000000 80862198
   [  239.845628] 7dc0: 7f3b2000 80862198 7f3b2000 80862198 00000000
   00000000 aa077e5c aa077de8
   [  239.853814] 7de0: 800098fc 7f3b200c 00000001 ba401f00 aa077e14
   aa077e00 8059f718 8059f68c
   [  239.861999] 7e00: 7f3af4ec ba401f00 aa077e5c aa077e18 801642c0
   8001da8c 00010ec4 00000001
   [  239.870184] 7e20: 000000d0 00010ec8 af79f540 a0000013 00000001
   7f3af4ec 00000001 7f3af4ec
   [  239.878369] 7e40: 00000001 af79f640 af79f380 00000001 aa077e84
   aa077e60 8059d240 8000986c
   [  239.886555] 7e60: aa077e84 aa077e70 aa077f48 00000001 af79f640
   7f3af4ec aa077f44 aa077e88
   [  239.894740] 7e80: 8009d98c 8059d1dc 7f3af4f8 00007fff 8009a8dc
   aa077f48 aa077ec4 806bfa34
   [  239.902926] 7ea0: 806bfa0c 806bfa00 806bfa64 805a9838 7f3af4f8
   bc8d0ea4 7f3af65c 8085edb8
   [  239.911111] 7ec0: 00000028 7f3af534 bc8cd000 00003f1c 000084a4
   00000000 0b300002 00000000
   [  239.919295] 7ee0: 00000000 00000000 00000000 00000000 00000000
   00000000 00000000 00000000
   [  239.927479] 7f00: 00000000 00000000 00000000 00000000 00000000
   00000000 00000020 00000000
   [  239.935665] 7f20: 00000003 0002cd30 0000017b 800100cc aa076000
   00000000 aa077fa4 aa077f48
   [  239.943850] 7f40: 8009e1a0 8009bf48 bc8cd000 00003f1c bc8d0904
   bc8d075c bc8cfa18 00002074
   [  239.952036] 7f60: 00002294 00000000 00000000 00000000 00000024
   00000025 0000001b 0000001f
   [  239.960221] 7f80: 00000016 00000000 00000000 3955fb00 00000002
   0003f040 00000000 aa077fa8
   [  239.968406] 7fa0: 8000fe00 8009e11c 3955fb00 00000002 00000003
   0002cd30 00000000 00000000
   [  239.976591] 7fc0: 3955fb00 00000002 0003f040 0000017b 00000000
   000297d8 00000002 00000003
   [  239.984777] 7fe0: 7ee06640 7ee06630 0002212c 76e7f590 60000010
   00000003 3b3fd821 3b3fdc21
   [  239.992976] [<800f7d94>] (xnsynch_sleep_on) from [<80103ed8>]
   (rtdm_event_timedwait+0x1a0/0x22c)
   [  240.001776] [<80103ed8>] (rtdm_event_timedwait) from [<80103f90>]
   (rtdm_event_wait+0x2c/0x34)
   [  240.010314] [<80103f90>] (rtdm_event_wait) from [<804a4fe0>]
   (do_transfer_irq+0x84/0x10c)
   [  240.018503] [<804a4fe0>] (do_transfer_irq) from [<804a50dc>]
   (bcm2835_write+0x34/0x40)
   [  240.026438] [<804a50dc>] (bcm2835_write) from [<7f3ae128>]
   (ads1256_rtdm_send_cmd+0xf0/0x150 [ads1256_rtdm])
   [  240.036300] [<7f3ae128>] (ads1256_rtdm_send_cmd [ads1256_rtdm]) from
   [<7f3ae210>] (ads1256_rtdm_read_register+0x30/0x58 [ads1256_rtdm])
   [  240.048500] [<7f3ae210>] (ads1256_rtdm_read_register [ads1256_rtdm])
   from [<7f3b20c4>] (ads1256_rtdm_init+0xc4/0x17c [ads1256_rtdm])
   [  240.060436] [<7f3b20c4>] (ads1256_rtdm_init [ads1256_rtdm]) from
   [<800098fc>] (do_one_initcall+0x9c/0x1e4)
   [  240.070105] [<800098fc>] (do_one_initcall) from [<8059d240>]
   (do_init_module+0x70/0x1bc)
   [  240.078212] [<8059d240>] (do_init_module) from [<8009d98c>]
   (load_module+0x1a50/0x2084)
   [  240.086228] [<8009d98c>] (load_module) from [<8009e1a0>]
   (SyS_finit_module+0x90/0xa0)
   [  240.094070] [<8009e1a0>] (SyS_finit_module) from [<8000fe00>]
   (ret_fast_syscall+0x0/0x3c)
   [  240.102255] Code: ebffdfd8 eaffffb3 e28530ec e5863014 (e58500ec)
   [  240.108356] ---[ end trace 42b843c8be735558 ]---
   Pozdrawiam

   Piotr PiA^3rkowski

   [10187b46759c48473619dbddf12197b3f62eabda7ccc124adfe93a251d5a0843?recip
   ient=xenomai%40xenomai.org]

   On paAA-o 27 2017, at 12:04 pm, Philippe Gerum <rpm at xenomai.org> wrote:

On 10/26/2017 08:48 PM, Piotr Piorkowski wrote:
>    Hello
>
>    I'm running rtdm kernel module using the xenomai 3.0.5 and Linux 4.1.21
>    on RPi 3
>    I have problem with spi-bcm2835 rtdm driver (from official
>    xenomai kernel source).
>    When I am using write function, I get segmentation fault.
>    Problem is on xnsynch_sleep_on() function:  xnthread_current() retrun
>    NULL.
>    Best Regards
>    Piotr PiA^3rkowski
>
>    [05cd4d4c8919f560c95bcb85a4ccc92404cecc76ba3dced93a3fc9c290ffda0f]


If this breaks in kernel space, you should have a stack backtrace dumped
to the kernel log. Please provide it.

--
Philippe.


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