Kernel crash on overlay removal (beaglebone)

[   48.777620] bone-cape-nixie bone-cape-nixie.10: Remove nixie cape driver...
[   48.785056] bone-cape-nixie bone-cape-nixie.10: disabling nixie tube
[   48.806355] Unable to handle kernel NULL pointer dereference at virtual address 0000001b
[   48.814950] pgd = cf64c000
[   48.817836] [0000001b] *pgd=8c804831, *pte=00000000, *ppte=00000000
[   48.824482] Internal error: Oops: 17 [#1] SMP THUMB2
[   48.829671] Modules linked in: uio_pruss ip_tables x_tables g_multi libcomposite rfcomm ircomm_tty ircomm irda ipv6 hidp bluetooth rfkill autofs4 [last unloaded: uio_pruss]
[   48.845868] CPU: 0    Not tainted  (3.8.11 #1)
[   48.850527] PC is at omap_device_idle+0xc/0x3a
[   48.855175] LR is at _od_runtime_suspend+0x15/0x18
[   48.860186] pc : [<c001f27e>]    lr : [<c001f2c1>]    psr: 60000133
[   48.860186] sp : cf709d80  ip : 0004e037  fp : cf2f1c10
[   48.872186] r10: c003d0cd  r9 : cf709db8  r8 : 00000000
[   48.877648] r7 : 00000000  r6 : cf4bc280  r5 : cf4bc210  r4 : 00000000
[   48.884471] r3 : 00000000  r2 : 00110010  r1 : cf4bc280  r0 : cf4bc200
[   48.891296] Flags: nZCv  IRQs on  FIQs on  Mode SVC_32  ISA Thumb  Segment user
[   48.898937] Control: 50c5387d  Table: 8f64c019  DAC: 00000015
[   48.904943] Process sh (pid: 288, stack limit = 0xcf708240)
[   48.910768] Stack: (0xcf709d80 to 0xcf70a000)
[   48.929250] 9d80: 00000000 c001f2c1 00000000 cf4bc210 c001f2ad c01f5383 c060ab98 cf4bc210
[   48.940110] 9da0: 00000000 c01f5729 5cf46834 0000000b 00000000 00000000 00000000 40000113
[   48.949810] 9dc0: cf4bc210 00000000 cf4bc280 40000113 00200200 cf400488 c03a4ce4 c01f603f
[   48.958964] 9de0: 00000000 cf4bc210 c001ead9 00000004 60000113 c01f30cd cf4bc210 c01f5383
[   48.968045] 9e00: c060ab98 cf4bc210 00000000 c01f5959 cf4bc210 00000004 cf4bc280 c01f5a07
[   48.976992] 9e20: c01a9113 cf4bc210 cc92c210 c064d190 00000000 c01a9129 c01a9113 cf4bc210
[   48.985948] 9e40: c0645d10 c01f0e85 c01f0e79 c01f011d cf496580 cf4bc244 cf4bc210 c01f015f
[   48.994837] 9e60: 00000000 cf4bc210 cf04543c c01efe57 cf4bc210 cf0b0800 cf0b0810 c01eebed
[   49.003805] 9e80: cf4bc200 cf0b0800 00000000 c01f1091 cf4bc200 c01f11fd cf628ec0 c02c65cf
[   49.013137] 9ea0: cf3a74e0 cf628ec0 cf400450 cf400488 00100100 c02c664d cf496580 00000000
[   49.022385] 9ec0: fffffec0 cf400458 cf400450 cf400590 cc8ae000 c02c6b63 cf5db010 00000000
[   49.031814] 9ee0: cf10d610 cf709f80 cf10d610 c01fdd3b 00000004 cf2f1c20 cf3ecd58 c01feb25
[   49.041228] 9f00: c066cc40 c036b9db 22222222 22222222 22222222 c01fead1 cf3ecd40 cf3ecd58
[   49.050437] 9f20: cf709f80 00000003 cf10d618 c03a4ce4 00000000 c01ee09b cf2f07c8 c00cd6ed
[   49.059417] 9f40: cc932740 000d6408 00000003 cf709f80 000d6408 00000003 00000000 c00942af
[   49.068500] 9f60: cc932740 000d6408 00000000 00000000 cc932740 00000000 000d6408 c00944bb
[   49.077444] 9f80: 00000000 00000000 00000003 00000003 000d6408 b6ebaa80 00000004 c000c7e4
[   49.086506] 9fa0: cf708000 c000c641 00000003 000d6408 00000001 000d6408 00000003 00000000
[   49.095476] 9fc0: 00000003 000d6408 b6ebaa80 00000004 00000003 00000003 000d6408 00000000
[   49.104559] 9fe0: 00000000 bef72924 b6df6b2c b6e4930c 600f0010 00000001 00000000 00000000
[   49.113208] [<c001f27e>] (omap_device_idle+0xc/0x3a) from [<c001f2c1>] (_od_runtime_suspend+0x15/0x18)
[   49.122987] [<c001f2c1>] (_od_runtime_suspend+0x15/0x18) from [<c01f5383>] (__rpm_callback+0x23/0x40)
[   49.132667] [<c01f5383>] (__rpm_callback+0x23/0x40) from [<c01f5729>] (rpm_suspend+0x1a9/0x2d0)
[   49.141802] [<c01f5729>] (rpm_suspend+0x1a9/0x2d0) from [<c01f603f>] (__pm_runtime_suspend+0x2f/0x62)
[   49.151478] [<c01f603f>] (__pm_runtime_suspend+0x2f/0x62) from [<c01f30cd>] (pm_generic_runtime_idle+0x11/0x28)
[   49.162072] [<c01f30cd>] (pm_generic_runtime_idle+0x11/0x28) from [<c01f5383>] (__rpm_callback+0x23/0x40)
[   49.172110] [<c01f5383>] (__rpm_callback+0x23/0x40) from [<c01f5959>] (rpm_idle+0xbd/0xec)
[   49.180785] [<c01f5959>] (rpm_idle+0xbd/0xec) from [<c01f5a07>] (__pm_runtime_idle+0x2f/0x62)
[   49.189769] [<c01f5a07>] (__pm_runtime_idle+0x2f/0x62) from [<c01a9129>] (pwmss_remove+0x17/0x28)
[   49.199091] [<c01a9129>] (pwmss_remove+0x17/0x28) from [<c01f0e85>] (platform_drv_remove+0xd/0xe)
[   49.208416] [<c01f0e85>] (platform_drv_remove+0xd/0xe) from [<c01f011d>] (__device_release_driver+0x41/0x6e)
[   49.218723] [<c01f011d>] (__device_release_driver+0x41/0x6e) from [<c01f015f>] (device_release_driver+0x15/0x1e)
[   49.229395] [<c01f015f>] (device_release_driver+0x15/0x1e) from [<c01efe57>] (bus_remove_device+0x77/0x88)
[   49.239527] [<c01efe57>] (bus_remove_device+0x77/0x88) from [<c01eebed>] (device_del+0xa5/0xec)
[   49.248658] [<c01eebed>] (device_del+0xa5/0xec) from [<c01f1091>] (platform_device_del+0xd/0x30)
[   49.257879] [<c01f1091>] (platform_device_del+0xd/0x30) from [<c01f11fd>] (platform_device_unregister+0x9/0x12)
[   49.268465] [<c01f11fd>] (platform_device_unregister+0x9/0x12) from [<c02c65cf>] (of_overlay_device_entry_change.isra.1+0x8f/0xd8)
[   49.280773] [<c02c65cf>] (of_overlay_device_entry_change.isra.1+0x8f/0xd8) from [<c02c664d>] (of_overlay_revert_one+0x35/0x148)
[   49.292807] [<c02c664d>] (of_overlay_revert_one+0x35/0x148) from [<c02c6b63>] (of_overlay_revert+0x2b/0x46)
[   49.303034] [<c02c6b63>] (of_overlay_revert+0x2b/0x46) from [<c01fdd3b>] (bone_capemgr_remove_slot_no_lock+0x27/0x94)
[   49.314166] [<c01fdd3b>] (bone_capemgr_remove_slot_no_lock+0x27/0x94) from [<c01feb25>] (slots_store+0x55/0x25c)
[   49.324852] [<c01feb25>] (slots_store+0x55/0x25c) from [<c01ee09b>] (dev_attr_store+0xb/0x12)
[   49.333805] [<c01ee09b>] (dev_attr_store+0xb/0x12) from [<c00cd6ed>] (sysfs_write_file+0x9d/0xd8)
[   49.343131] [<c00cd6ed>] (sysfs_write_file+0x9d/0xd8) from [<c00942af>] (vfs_write+0x63/0x104)
[   49.352173] [<c00942af>] (vfs_write+0x63/0x104) from [<c00944bb>] (sys_write+0x27/0x44)
[   49.360587] [<c00944bb>] (sys_write+0x27/0x44) from [<c000c641>] (ret_fast_syscall+0x1/0x46)
[   49.374495] Code: f8d0 41c8 e000 4604 (7ee3) 2b01
[   49.379570] ---[ end trace 0d091aa0b0587681 ]---