root@rtkdev:~# 
root@rtkdev:~# 
root@rtkdev:~# 
root@rtkdev:~# [  223.031518] page:c6f757c0 refcount:0 mapcount:0 mapping:00000400 index:0x0 compound_mapcount: 0
[  223.041201] flags: 0x0()
[  223.044021] raw: 00000000 c6f75701 c6f757c4 00000400 00000000 00000000 ffffffff 00000000
[  223.053010] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0)
[  223.060660] ------------[ cut here ]------------
[  223.065788] kernel BUG at ./include/linux/mm.h:626!
[  223.071206] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
[  223.077683] Modules linked in:
[  223.081079] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.61 #4030
[  223.087945] Hardware name: Generic DT based system
[  223.093277] PC is at put_page_testzero.part.11+0xc/0x14
[  223.099083] LR is at put_page_testzero.part.11+0xc/0x14
[  223.104887] pc : [<c01c3cc8>]    lr : [<c01c3cc8>]    psr: 600b0193
[  223.111849] sp : c0c01d50  ip : 00000000  fp : c881b004
[  223.117653] r10: 0000007a  r9 : 0000007a  r8 : c0c45a2c
[  223.123457] r7 : c571ed88  r6 : 00000000  r5 : c0c45a14  r4 : c571ed80
[  223.130708] r3 : f3794df9  r2 : f3794df9  r1 : 00010002  r0 : 0000003e
[  223.137963] Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment none
[  223.145987] Control: 10c5387d  Table: 458dc06a  DAC: 00000051
[  223.152374] Process swapper/0 (pid: 0, stack limit = 0x9b7f8f61)
[  223.159046] Stack: (0xc0c01d50 to 0xc0c02000)
[  223.163888] 1d40:                                     c571ed80 c01c59c0 c571ed80 c04f8bf8
[  223.172980] 1d60: c0c45a14 c571ed80 c571ed80 c0c8fa88 00000001 00000001 c0c45a14 c04f8de4
[  223.182073] 1d80: c423e342 00000001 00000200 c0c45a14 00000200 c0c45958 c571ed80 600b0113
[  223.191164] 1da0: 00000001 00000000 c0a1ca7c c04f95d8 c0c45958 c0c45a14 c571ed80 c0c45a14
[  223.200258] 1dc0: c571ed80 c0c8fa88 00000400 0000027a 00000600 c04f97e0 c69ecd40 c69ecda8
[  223.209351] 1de0: c0c04e64 c0c00000 c0b2e14b c0c8fa88 c571ed80 c0c45a14 00000001 00000001
[  223.218442] 1e00: 00000000 00000001 c09eb1dd c04f9b3c c0c45958 c0c8fa88 a00b0193 00000001
[  223.227532] 1e20: 00000000 c084b510 00000001 c04fa638 00000000 00000033 00000002 00000000
[  223.236625] 1e40: 00000000 c0c04e08 00000000 c01719e4 c0c75d80 29aaaaab 652ce100 000aba95
[  223.245716] 1e60: 200b0193 f3794df9 c09c3047 c59102c0 00000000 0000003b c69ecda8 c69ecd40
[  223.254807] 1e80: c0c01ec0 c0c6363e c099dc71 c015898c c69ecd40 c0c01ec0 00010001 c0c04e08
[  223.263897] 1ea0: c69ecda8 c69ecd40 c69ecda8 c0c04e64 c0c00000 c0b2e14b c0b2e05c c0158a74
[  223.272990] 1ec0: 00000000 f3794df9 c69ecd40 c69ecda8 c69ecd54 c0158b00 c69ecd40 c0c05180
[  223.282082] 1ee0: c69ecd54 c015cf44 00000000 00000000 c6806400 00000001 c0c04e64 c0157cdc
[  223.291174] 1f00: 00000000 c01582c0 c8802000 c0c05180 c0c01f38 c8803000 c0c04e64 c038ed98
[  223.300264] 1f20: c0107fd8 600b0013 ffffffff c0c01f6c c0c04e64 c01021cc 0000a844 c6eb7774
[  223.309356] 1f40: 00000000 c0114b80 00000001 c0c04e28 ffffe000 c0c63622 c0c04e64 c0b2f0c0
[  223.318449] 1f60: c0b2e14b c0b2e05c 0000001f c0c01f88 c0107fe8 c0107fd8 600b0013 ffffffff
[  223.327540] 1f80: 00000051 00000000 00000001 c013dedc 000000cf c0c6c000 c0c04e08 c0c04e00
[  223.336630] 1fa0: 00000000 c013e1c8 c0b2f0c0 c0b00d04 ffffffff ffffffff 00000000 c0b005dc
[  223.345723] 1fc0: 00000000 c0b2f0c0 f37c49c4 00000000 00000000 c0b00330 00000051 10c0387d
[  223.354815] 1fe0: 00000000 41800000 410fc075 10c5387d 00000000 00000000 00000000 00000000
[  223.363917] [<c01c3cc8>] (put_page_testzero.part.11) from [<c01c59c0>] (__free_pages+0x14/0x34)
[  223.373593] [<c01c59c0>] (__free_pages) from [<c04f8bf8>] (sunxi_udc_done+0x12c/0x188)
[  223.382403] [<c04f8bf8>] (sunxi_udc_done) from [<c04f8de4>] (pio_read_fifo+0x190/0x1c4)
[  223.391304] [<c04f8de4>] (pio_read_fifo) from [<c04f95d8>] (sunxi_udc_dma_completion+0x1f0/0x2ac)
[  223.401172] [<c04f95d8>] (sunxi_udc_dma_completion) from [<c04f97e0>] (sunxi_udc_read_fifo+0x14c/0x360)
[  223.411617] [<c04f97e0>] (sunxi_udc_read_fifo) from [<c04f9b3c>] (sunxi_udc_handle_ep+0x148/0x160)
[  223.421583] [<c04f9b3c>] (sunxi_udc_handle_ep) from [<c04fa638>] (sunxi_udc_irq+0x5a4/0xd70)
[  223.430970] [<c04fa638>] (sunxi_udc_irq) from [<c015898c>] (__handle_irq_event_percpu+0x44/0x108)
[  223.440840] [<c015898c>] (__handle_irq_event_percpu) from [<c0158a74>] (handle_irq_event_percpu+0x24/0x78)
[  223.451576] [<c0158a74>] (handle_irq_event_percpu) from [<c0158b00>] (handle_irq_event+0x38/0x5c)
[  223.461444] [<c0158b00>] (handle_irq_event) from [<c015cf44>] (handle_fasteoi_irq+0xa0/0x118)
[  223.470925] [<c015cf44>] (handle_fasteoi_irq) from [<c0157cdc>] (generic_handle_irq+0x18/0x28)
[  223.480500] [<c0157cdc>] (generic_handle_irq) from [<c01582c0>] (__handle_domain_irq+0x90/0xa0)
[  223.490178] [<c01582c0>] (__handle_domain_irq) from [<c038ed98>] (gic_handle_irq+0x4c/0x78)
[  223.499467] [<c038ed98>] (gic_handle_irq) from [<c01021cc>] (__irq_svc+0x6c/0xa8)
[  223.507782] Exception stack(0xc0c01f38 to 0xc0c01f80)
[  223.513393] 1f20:                                                       0000a844 c6eb7774
[  223.522486] 1f40: 00000000 c0114b80 00000001 c0c04e28 ffffe000 c0c63622 c0c04e64 c0b2f0c0
[  223.531578] 1f60: c0b2e14b c0b2e05c 0000001f c0c01f88 c0107fe8 c0107fd8 600b0013 ffffffff
[  223.540674] [<c01021cc>] (__irq_svc) from [<c0107fd8>] (arch_cpu_idle+0x1c/0x38)
[  223.548899] [<c0107fd8>] (arch_cpu_idle) from [<c013dedc>] (do_idle+0xdc/0x12c)
[  223.557028] [<c013dedc>] (do_idle) from [<c013e1c8>] (cpu_startup_entry+0x18/0x20)
[  223.565447] [<c013e1c8>] (cpu_startup_entry) from [<c0b00d04>] (start_kernel+0x3f4/0x490)
[  223.574541] Code: c09a4495 e92d4010 e59f1004 ebffb26e (e7f001f2) 
[  223.581311] ---[ end trace 52549e9bcbe5da7d ]---
[  223.586441] Kernel panic - not syncing: Fatal exception in interrupt
[  223.593514] CPU1: stopping
[  223.596528] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G      D           5.4.61 #4030
[  223.604938] Hardware name: Generic DT based system
[  223.610270] [<c010e2e4>] (unwind_backtrace) from [<c010a8f0>] (show_stack+0x10/0x14)
[  223.618884] [<c010a8f0>] (show_stack) from [<c07933fc>] (dump_stack+0x7c/0x98)
[  223.626918] [<c07933fc>] (dump_stack) from [<c010c6f8>] (handle_IPI+0xcc/0x168)
[  223.635046] [<c010c6f8>] (handle_IPI) from [<c038edbc>] (gic_handle_irq+0x70/0x78)
[  223.643462] [<c038edbc>] (gic_handle_irq) from [<c01021cc>] (__irq_svc+0x6c/0xa8)
[  223.651778] Exception stack(0xc6841f80 to 0xc6841fc8)
[  223.657394] 1f80: 000059f0 c6ec6774 00000000 c0114b80 00000002 c0c04e28 ffffe000 c0c63622
[  223.666486] 1fa0: c0c04e64 410fc075 00000000 00000000 00000000 c6841fd0 c0107fe8 c0107fd8
[  223.675572] 1fc0: 60030013 ffffffff
[  223.679452] [<c01021cc>] (__irq_svc) from [<c0107fd8>] (arch_cpu_idle+0x1c/0x38)
[  223.687677] [<c0107fd8>] (arch_cpu_idle) from [<c013dedc>] (do_idle+0xdc/0x12c)
[  223.695803] [<c013dedc>] (do_idle) from [<c013e1c8>] (cpu_startup_entry+0x18/0x20)
[  223.704217] [<c013e1c8>] (cpu_startup_entry) from [<40102c2c>] (0x40102c2c)
[  223.711961] ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---