8<--- cut here --- Unable to handle kernel paging request at virtual address fee00007 when write [fee00007] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 5050 Comm: syz.0.322 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 : [<8149e358>] lr : [<8149e344>] psr: 60000013 sp : df9ddcb8 ip : df9ddcb8 fp : df9ddcd4 r10: 00000004 r9 : 00000004 r8 : df9ddda4 r7 : 00000000 r6 : 0000009b r5 : 84621cc0 r4 : 00000007 r3 : 0000009b r2 : fee00007 r1 : 00000001 r0 : 84621cc0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86576540 DAC: 00000000 Register r0 information: slab kmalloc-192 start 84621cc0 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 84621cc0 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 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.0.322 (pid: 5050, stack limit = 0xdf9dc000) Stack: (0xdf9ddcb8 to 0xdf9de000) dca0: 8149e2f8 00000004 dcc0: 84621cc0 00000000 df9ddcf4 df9ddcd8 8149e034 8149e304 00000004 80545e10 dce0: 8474b000 8474b000 df9ddd14 df9ddcf8 8149e3ec 8149dfe8 84621cc0 00000000 dd00: 8474b000 00000000 df9ddd54 df9ddd18 8149e59c 8149e370 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd9600 84621cc0 00000000 df9ddd90 84621cc0 dd40: 00000000 82d30dfc df9ddd8c df9ddd58 8148cf3c 8149e534 40946400 00000000 dd60: df9ddd7c 200000c0 84621cc0 b5403587 40946400 00000003 00000003 8479c980 dd80: df9dde4c df9ddd90 81488740 8148ce40 35353238 00000000 00000000 00000000 dda0: 00000000 00000004 00000006 00000f01 00000007 00000011 00000005 00000079 ddc0: 00000003 00080008 00000109 000003ff 00000001 00000006 00000001 00000d12 dde0: 00000006 00000008 20000009 00000003 7fffffff ffffffff 0000ca9f 0000017f de00: 00200008 fffffffb 0000f39a fffffffc 00000008 0000a6b3 00000000 fffffff8 de20: 00000000 4a063b35 00000000 85f86680 84621cc0 200000c0 40946400 00000003 de40: df9ddf14 df9dde50 81489a68 81488680 00000000 4a063b35 00000000 00000000 de60: 8254880c df9ddea4 0000005f 84744b68 00000064 84621cf0 df9ddee4 df9dde88 de80: 80804fec 807fb31c 00000064 00000001 00000000 df9ddea4 85e43210 83432b28 dea0: 00006400 0000000b df9dde98 00000000 00000000 4a063b35 00000000 85f86680 dec0: 40946400 200000c0 200000c0 85f86680 00000003 8479c980 df9ddef4 df9ddee8 dee0: 80805120 4a063b35 df9ddf14 00000000 85f86681 40946400 200000c0 85f86680 df00: 00000003 8479c980 df9ddfa4 df9ddf18 805ba7e8 81489720 ecac8b10 8479c980 df20: df9ddf3c df9ddf30 81b54ac0 81b5498c df9ddf54 df9ddf40 8025a7ac 8028e488 df40: df9ddfb0 40000000 df9ddf84 df9ddf58 80220bdc 8025a768 00000000 82a1eb0c df60: df9ddfb0 0013e9c0 ecac8b10 80220b30 00000000 4a063b35 df9ddfac 00000000 df80: 00000000 00346310 00000036 8020029c 8479c980 00000036 00000000 df9ddfa8 dfa0: 80200060 805ba5b0 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f230dc dfe0: 76f22e88 76f22e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<8149e2f8>] (subdev_8255_io) from [<8149e034>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:84621cc0 r5:00000004 r4:8149e2f8 [<8149dfdc>] (subdev_8255_do_config) from [<8149e3ec>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8149dfdc>] (subdev_8255_do_config) from [<8149e3ec>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8474b000 [<8149e364>] (subdev_8255_io_init) from [<8149e59c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<8149e364>] (subdev_8255_io_init) from [<8149e59c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8474b000 r5:00000000 r4:84621cc0 [<8149e528>] (dev_8255_attach) from [<8148cf3c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:84621cc0 r7:df9ddd90 r6:00000000 r5:84621cc0 r4:82bd9600 [<8148ce34>] (comedi_device_attach) from [<81488740>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8479c980 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84621cc0 r4:200000c0 [<81488674>] (do_devconfig_ioctl) from [<81489a68>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:84621cc0 r4:85f86680 [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81489714>] (comedi_unlocked_ioctl) from [<805ba7e8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8479c980 r9:00000003 r8:85f86680 r7:200000c0 r6:40946400 r5:85f86681 r4:00000000 [<805ba5a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9ddfa8 to 0xdf9ddff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f230dc dfe0: 76f22e88 76f22e78 00018ebc 00130820 r10:00000036 r9:8479c980 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