8<--- cut here --- Unable to handle kernel paging request at virtual address fee02f03 when write [fee02f03] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5997 Comm: syz.0.719 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 : [<815594a0>] lr : [<8155948c>] psr: 60000013 sp : eacddcb8 ip : eacddcb8 fp : eacddcd4 r10: 00002f00 r9 : 00000004 r8 : eacddda4 r7 : 00000000 r6 : 0000009b r5 : 8540b3c0 r4 : 00002f03 r3 : 0000009b r2 : fee02f03 r1 : 00000001 r0 : 8540b3c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86c32e80 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8540b3c0 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:974 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 8540b3c0 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 0xeacdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xeacdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Register r12 information: 2-page vmalloc region starting at 0xeacdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2790 Process syz.0.719 (pid: 5997, stack limit = 0xeacdc000) Stack: (0xeacddcb8 to 0xeacde000) dca0: 81559440 00002f00 dcc0: 8540b3c0 00000000 eacddcf4 eacddcd8 8155917c 8155944c 00002f00 80579678 dce0: 871e1c00 871e1c00 eacddd14 eacddcf8 81559534 81559130 8540b3c0 00000000 dd00: 871e1c00 00000000 eacddd54 eacddd18 815596e4 815594b8 ffffffff 00000004 dd20: 8341e340 00000000 00000000 835dfba8 8540b3c0 00000000 eacddd90 8540b3c0 dd40: 00000000 83737408 eacddd8c eacddd58 815480dc 8155967c 40946400 00000000 dd60: eacddd7c 20002240 8540b3c0 b5403587 40946400 00000002 00000005 84d70000 dd80: eacdde4c eacddd90 815438f8 81547fe0 35353238 00000000 00000000 00000000 dda0: 00000000 00002f00 00000005 00600000 00000000 00000001 fffffffe 20000004 ddc0: 00000003 00000ffe 80000000 00000008 00000000 10000004 00000003 0000fffd dde0: 00000002 00000006 000007ff 00000830 fffffffc 00000009 fffffffd 00000800 de00: 00000101 fffffffc 00007ffe 00000004 00000003 fffffffe 00001005 0000070f de20: 00000000 85ff7a5b 00000000 8742fa00 8540b3c0 20002240 40946400 00000002 de40: eacddf14 eacdde50 81544c08 81543838 8276ba64 84e72990 00000064 8543e36c de60: eacddee4 eacdde70 8085e2d4 80854634 00000064 8540b3f0 00000000 eacdde90 de80: 00000000 86c35810 84028880 40946400 0000000b 00000000 eacdde84 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 85ff7a5b 00000000 8742fa00 dec0: 40946400 20002240 20002240 8742fa00 00000005 84d70000 eacddef4 eacddee8 dee0: 8085e404 85ff7a5b eacddf14 00000000 8742fa01 40946400 20002240 8742fa00 df00: 00000005 84d70000 eacddfa4 eacddf18 805f378c 815448c0 ecac8b10 84d70000 df20: eacddf3c eacddf30 81c0eab0 81c0e97c eacddf54 eacddf40 8025cbac 80292058 df40: eacddfb0 40000000 eacddf84 eacddf58 80222c2c 8025cb64 00000000 8341a10c df60: eacddfb0 0013f390 ecac8b10 80222b80 00000000 85ff7a5b eacddfac 00000000 df80: 00000000 00356310 00000036 8020029c 84d70000 00000036 00000000 eacddfa8 dfa0: 80200060 805f3554 00000000 00000000 00000005 40946400 20002240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2d0dc dfe0: 76f2ce88 76f2ce78 00018ff8 001311f0 60000010 00000005 00000000 00000000 Call trace: [<81559440>] (subdev_8255_io) from [<8155917c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8540b3c0 r5:00002f00 r4:81559440 [<81559124>] (subdev_8255_do_config) from [<81559534>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81559124>] (subdev_8255_do_config) from [<81559534>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:871e1c00 [<815594ac>] (subdev_8255_io_init) from [<815596e4>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<815594ac>] (subdev_8255_io_init) from [<815596e4>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:871e1c00 r5:00000000 r4:8540b3c0 [<81559670>] (dev_8255_attach) from [<815480dc>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:83737408 r9:00000000 r8:8540b3c0 r7:eacddd90 r6:00000000 r5:8540b3c0 r4:835dfba8 [<81547fd4>] (comedi_device_attach) from [<815438f8>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:931) r10:84d70000 r9:00000005 r8:00000002 r7:40946400 r6:b5403587 r5:8540b3c0 r4:20002240 [<8154382c>] (do_devconfig_ioctl) from [<81544c08>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2303) r8:00000002 r7:40946400 r6:20002240 r5:8540b3c0 r4:8742fa00 [<815448b4>] (comedi_unlocked_ioctl) from [<805f378c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<815448b4>] (comedi_unlocked_ioctl) from [<805f378c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<815448b4>] (comedi_unlocked_ioctl) from [<805f378c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<815448b4>] (comedi_unlocked_ioctl) from [<805f378c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84d70000 r9:00000005 r8:8742fa00 r7:20002240 r6:40946400 r5:8742fa01 r4:00000000 [<805f3548>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeacddfa8 to 0xeacddff0) dfa0: 00000000 00000000 00000005 40946400 20002240 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2d0dc dfe0: 76f2ce88 76f2ce78 00018ff8 001311f0 r10:00000036 r9:84d70000 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