8<--- cut here --- Unable to handle kernel paging request at virtual address fee00032 when write [fee00032] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5235 Comm: syz.3.196 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 : [<81436260>] lr : [<8143624c>] psr: 60000013 sp : dfbd1cb8 ip : dfbd1cb8 fp : dfbd1cd4 r10: 00000000 r9 : 00000084 r8 : dfbd1da4 r7 : 0000002f r6 : 0000009b r5 : 84298b40 r4 : 00000032 r3 : 0000009b r2 : fee00032 r1 : 00000001 r0 : 84298b40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85e49a80 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84298b40 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:1055 Register r3 information: non-paged memory Register r4 information: non-paged memory Register r5 information: slab kmalloc-192 start 84298b40 pointer offset 0 size 192 Register r6 information: non-paged memory Register r7 information: non-paged memory Register r8 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r9 information: non-paged memory Register r10 information: NULL pointer Register r11 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.3.196 (pid: 5235, stack limit = 0xdfbd0000) Stack: (0xdfbd1cb8 to 0xdfbd2000) 1ca0: 81436200 0000002f 1cc0: 84298b40 0000002f dfbd1cf4 dfbd1cd8 81435f3c 8143620c 0000002f 805223ec 1ce0: 86537000 86537000 dfbd1d14 dfbd1cf8 814362f4 81435ef0 84298b40 00000000 1d00: 86537000 0000002f dfbd1d54 dfbd1d18 814364a4 81436278 82b07ef4 83348a00 1d20: 82821780 00000000 00000000 829d6504 84298b40 00000000 dfbd1d90 84298b40 1d40: 00000000 82b2df9c dfbd1d8c dfbd1d58 81424e90 8143643c 40946400 00000000 1d60: dfbd1d7c 200000c0 84298b40 b5403587 40946400 8527c800 00000003 84298b70 1d80: dfbd1e4c dfbd1d90 814207c8 81424d90 35353238 00000000 00000000 00000000 1da0: 00000000 0000002f 00000005 00000003 00000401 00000001 00000009 00000000 1dc0: 5c952399 00000000 000003ff 00000802 00001600 00000008 00000001 00000009 1de0: 0000e1cb 00000006 00000002 00000002 00000002 80000089 fffffffd 00000000 1e00: 00000101 ffffeadb 00000003 0000003c 00000008 00000004 08000000 dffffffa 1e20: 00000000 73adecc1 00000000 86a149c0 84298b40 200000c0 40946400 8527c800 1e40: dfbd1f14 dfbd1e50 81421348 81420700 00000000 73adecc1 00000000 00000000 1e60: 824b557c dfbd1ea4 0000005f 843caa30 00000064 842f8714 dfbd1ee4 dfbd1e88 1e80: 807cb7cc 807c1ba4 00000064 00000001 00000000 dfbd1ea4 86111190 83434770 1ea0: 00006400 0000000b dfbd1e98 00000000 00000000 73adecc1 00000000 86a149c0 1ec0: 40946400 200000c0 200000c0 86a149c0 00000003 8527c800 dfbd1ef4 dfbd1ee8 1ee0: 807cb8fc 73adecc1 dfbd1f14 00000000 86a149c1 40946400 200000c0 86a149c0 1f00: 00000003 8527c800 dfbd1fa4 dfbd1f18 8058f558 81421250 ecac8b10 8527c800 1f20: dfbd1f3c dfbd1f30 81ad9374 81ad9240 dfbd1f54 dfbd1f40 8025a85c 8028bff0 1f40: dfbd1fb0 40000000 dfbd1f84 dfbd1f58 80220bf8 8025a818 00000000 8281d27c 1f60: dfbd1fb0 0013ddc0 ecac8b10 80220b4c 00000000 73adecc1 dfbd1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 8527c800 00000036 00000000 dfbd1fa8 1fa0: 80200060 8058f320 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0c0dc 1fe0: 76f0be88 76f0be78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81436200>] (subdev_8255_io) from [<81435f3c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:0000002f r6:84298b40 r5:0000002f r4:81436200 [<81435ee4>] (subdev_8255_do_config) from [<814362f4>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81435ee4>] (subdev_8255_do_config) from [<814362f4>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:86537000 [<8143626c>] (subdev_8255_io_init) from [<814364a4>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143626c>] (subdev_8255_io_init) from [<814364a4>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:0000002f r6:86537000 r5:00000000 r4:84298b40 [<81436430>] (dev_8255_attach) from [<81424e90>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2df9c r9:00000000 r8:84298b40 r7:dfbd1d90 r6:00000000 r5:84298b40 r4:829d6504 [<81424d84>] (comedi_device_attach) from [<814207c8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84298b70 r9:00000003 r8:8527c800 r7:40946400 r6:b5403587 r5:84298b40 r4:200000c0 [<814206f4>] (do_devconfig_ioctl) from [<81421348>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:8527c800 r7:40946400 r6:200000c0 r5:84298b40 r4:86a149c0 [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81421244>] (comedi_unlocked_ioctl) from [<8058f558>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8527c800 r9:00000003 r8:86a149c0 r7:200000c0 r6:40946400 r5:86a149c1 r4:00000000 [<8058f314>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbd1fa8 to 0xdfbd1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0c0dc 1fe0: 76f0be88 76f0be78 00018734 0012fc20 r10:00000036 r9:8527c800 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