8<--- cut here --- Unable to handle kernel paging request at virtual address fee00103 when write [fee00103] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5231 Comm: syz.0.382 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:88 [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 : [<81468748>] lr : [<81468734>] psr: 60000013 sp : dfc1dcb8 ip : dfc1dcb8 fp : dfc1dcd4 r10: 00000100 r9 : 00000004 r8 : dfc1dda4 r7 : 00000000 r6 : 0000009b r5 : 8301bc00 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8301bc00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 851b47c0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8301bc00 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 8301bc00 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 0xdfc1c000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfc1c000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xdfc1c000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.0.382 (pid: 5231, stack limit = 0xdfc1c000) Stack: (0xdfc1dcb8 to 0xdfc1e000) dca0: 814686e8 00000100 dcc0: 8301bc00 00000000 dfc1dcf4 dfc1dcd8 81468424 814686f4 00000100 80532a04 dce0: 8628c000 8628c000 dfc1dd14 dfc1dcf8 814687dc 814683d8 8301bc00 00000000 dd00: 8628c000 00000000 dfc1dd54 dfc1dd18 8146898c 81468760 ffffffff 00000004 dd20: 82a20900 00000000 00000000 82bd2a24 8301bc00 00000000 dfc1dd90 8301bc00 dd40: 00000000 82d29754 dfc1dd8c dfc1dd58 81457330 81468924 40946400 00000000 dd60: dfc1dd7c 20000180 8301bc00 b5403587 40946400 00000003 00000003 850ee400 dd80: dfc1de4c dfc1dd90 81452b3c 81457234 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 00000005 000000d0 0000557b 00000002 00000100 00000003 ddc0: 20000000 00000008 00000007 00000000 00000003 00000001 000003fe 00010001 dde0: 00000004 00000000 00000003 00000009 00000403 2821894b 00000003 00008001 de00: 00000009 00000048 0000000d 00000008 00006a77 00000001 00000007 00000008 de20: 00000000 30ceb2ab 00000000 85b53f00 8301bc00 20000180 40946400 00000003 de40: dfc1df14 dfc1de50 81453e60 81452a74 00000000 30ceb2ab 00000000 00000000 de60: 82531804 dfc1dea4 0000005f 843ae990 00000064 8301bc30 dfc1dee4 dfc1de88 de80: 807ea9c4 807e0cd8 00000064 00000001 00000000 dfc1dea4 830e9250 83425660 dea0: 00006400 0000000b dfc1de98 00000000 00000000 30ceb2ab 00000000 85b53f00 dec0: 40946400 20000180 20000180 85b53f00 00000003 850ee400 dfc1def4 dfc1dee8 dee0: 807eaaf8 30ceb2ab dfc1df14 00000000 85b53f00 40946400 20000180 85b53f00 df00: 00000003 850ee400 dfc1dfa4 dfc1df18 805a2320 81453b18 ecac8b10 850ee400 df20: dfc1df3c dfc1df30 81b1af54 81b1ae20 dfc1df54 dfc1df40 8025a6ac 8028e294 df40: dfc1dfb0 40000000 dfc1df84 dfc1df58 80220be0 8025a668 00000000 82a1c63c df60: dfc1dfb0 0013e9b0 ecac8b10 80220b34 00000000 30ceb2ab dfc1dfac 00000000 df80: 00000000 00346310 00000036 8020029c 850ee400 00000036 00000000 dfc1dfa8 dfa0: 80200060 805a20e8 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb90dc dfe0: 76fb8e88 76fb8e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<814686e8>] (subdev_8255_io) from [<81468424>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8301bc00 r5:00000100 r4:814686e8 [<814683cc>] (subdev_8255_do_config) from [<814687dc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814683cc>] (subdev_8255_do_config) from [<814687dc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8628c000 [<81468754>] (subdev_8255_io_init) from [<8146898c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81468754>] (subdev_8255_io_init) from [<8146898c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8628c000 r5:00000000 r4:8301bc00 [<81468918>] (dev_8255_attach) from [<81457330>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d29754 r9:00000000 r8:8301bc00 r7:dfc1dd90 r6:00000000 r5:8301bc00 r4:82bd2a24 [<81457228>] (comedi_device_attach) from [<81452b3c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:850ee400 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301bc00 r4:20000180 [<81452a68>] (do_devconfig_ioctl) from [<81453e60>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301bc00 r4:85b53f00 [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453b0c>] (comedi_unlocked_ioctl) from [<805a2320>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:850ee400 r9:00000003 r8:85b53f00 r7:20000180 r6:40946400 r5:85b53f00 r4:00000000 [<805a20dc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc1dfa8 to 0xdfc1dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fb90dc dfe0: 76fb8e88 76fb8e78 00018ebc 00130810 r10:00000036 r9:850ee400 r8:8020029c r7:00000036 r6:00346310 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