8<--- cut here --- Unable to handle kernel paging request at virtual address fee00143 when write [fee00143] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 4386 Comm: syz.0.92 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] PC is at subdev_8255_io+0x60/0x6c drivers/comedi/drivers/comedi_8255.c:43 LR is at subdev_8255_io drivers/comedi/drivers/comedi_8255.c:47 [inline] LR is at subdev_8255_io+0x4c/0x6c drivers/comedi/drivers/comedi_8255.c:43 pc : [<814a1f84>] lr : [<814a1f70>] psr: 60000013 sp : ea43dcb8 ip : ea43dcb8 fp : ea43dcd4 r10: 00000140 r9 : 00000004 r8 : ea43dda4 r7 : 00000000 r6 : 0000009b r5 : 83019540 r4 : 00000143 r3 : 0000009b r2 : fee00143 r1 : 00000001 r0 : 83019540 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 859dfdc0 DAC: 00000000 Register r0 information: slab kmalloc-192 start 83019540 pointer offset 0 size 192 Register r1 information: non-paged memory Register r2 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 83019540 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: NULL pointer Register r8 information: 2-page vmalloc region starting at 0xea43c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xea43c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xea43c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.0.92 (pid: 4386, stack limit = 0xea43c000) Stack: (0xea43dcb8 to 0xea43e000) dca0: 814a1f24 00000140 dcc0: 83019540 00000000 ea43dcf4 ea43dcd8 814a1c60 814a1f30 00000140 80546390 dce0: 85348a80 85348a80 ea43dd14 ea43dcf8 814a2018 814a1c14 83019540 00000000 dd00: 85348a80 00000000 ea43dd54 ea43dd18 814a21c8 814a1f9c ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd965c 83019540 00000000 ea43dd90 83019540 dd40: 00000000 82d30dfc ea43dd8c ea43dd58 81490b50 814a2160 40946400 00000000 dd60: ea43dd7c 200000c0 83019540 b5403587 40946400 00000001 00000003 8471bd40 dd80: ea43de4c ea43dd90 8148c354 81490a54 35353238 00000000 00000000 00000000 dda0: 00000000 00000140 00000000 00000009 00000002 10000007 00000001 00007fff ddc0: 30000002 00000007 0000c72d 00000000 00000007 00000003 00000008 00000029 dde0: 000072f0 00000101 00000006 00000006 00000401 00000004 00000006 0000a2d8 de00: 00000009 00001000 00000008 0000000a ffffffff 00000383 00008001 00000004 de20: 00000000 367e923a 00000000 84f57c80 83019540 200000c0 40946400 00000001 de40: ea43df14 ea43de50 8148d67c 8148c294 00000000 367e923a 00000000 00000000 de60: 82549844 ea43dea4 0000005f 841a0058 00000064 83019570 ea43dee4 ea43de88 de80: 8080664c 807fcd04 00000064 00000001 00000000 ea43dea4 85a02a10 83425000 dea0: 00006400 0000000b ea43de98 00000000 00000000 367e923a 00000000 84f57c80 dec0: 40946400 200000c0 200000c0 84f57c80 00000003 8471bd40 ea43def4 ea43dee8 dee0: 80806780 367e923a ea43df14 00000000 84f57c81 40946400 200000c0 84f57c80 df00: 00000003 8471bd40 ea43dfa4 ea43df18 805bb0cc 8148d334 ecac8b10 8471bd40 df20: ea43df3c ea43df30 81b5b1a0 81b5b06c ea43df54 ea43df40 8025a7a8 8028e490 df40: ea43dfb0 40000000 ea43df84 ea43df58 80220bdc 8025a764 00000000 82a1eb0c df60: ea43dfb0 0013ea80 ecac8b10 80220b30 00000000 367e923a ea43dfac 00000000 df80: 00000000 00356310 00000036 8020029c 8471bd40 00000036 00000000 ea43dfa8 dfa0: 80200060 805bae94 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76ffb0dc dfe0: 76ffae88 76ffae78 00018ebc 001308e0 60000010 00000003 00000000 00000000 Call trace: [<814a1f24>] (subdev_8255_io) from [<814a1c60>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:83019540 r5:00000140 r4:814a1f24 [<814a1c08>] (subdev_8255_do_config) from [<814a2018>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814a1c08>] (subdev_8255_do_config) from [<814a2018>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85348a80 [<814a1f90>] (subdev_8255_io_init) from [<814a21c8>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<814a1f90>] (subdev_8255_io_init) from [<814a21c8>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85348a80 r5:00000000 r4:83019540 [<814a2154>] (dev_8255_attach) from [<81490b50>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:83019540 r7:ea43dd90 r6:00000000 r5:83019540 r4:82bd965c [<81490a48>] (comedi_device_attach) from [<8148c354>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8471bd40 r9:00000003 r8:00000001 r7:40946400 r6:b5403587 r5:83019540 r4:200000c0 [<8148c288>] (do_devconfig_ioctl) from [<8148d67c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:200000c0 r5:83019540 r4:84f57c80 [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8471bd40 r9:00000003 r8:84f57c80 r7:200000c0 r6:40946400 r5:84f57c81 r4:00000000 [<805bae88>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea43dfa8 to 0xea43dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76ffb0dc dfe0: 76ffae88 76ffae78 00018ebc 001308e0 r10:00000036 r9:8471bd40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e6ef3076 e0842002 e7f32052 e2422612 (e5c23000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e6ef3076 uxtb r3, r6 4: e0842002 add r2, r4, r2 8: e7f32052 ubfx r2, r2, #0, #20 c: e2422612 sub r2, r2, #18874368 @ 0x1200000 * 10: e5c23000 strb r3, [r2] <-- trapping instruction