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: 9989 Comm: syz.7.1178 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 : [<81488c08>] lr : [<81488bf4>] psr: 60000013 sp : dfa8dcb8 ip : dfa8dcb8 fp : dfa8dcd4 r10: 00000100 r9 : 00000004 r8 : dfa8dda4 r7 : 00000000 r6 : 0000009b r5 : 8315b240 r4 : 00000103 r3 : 0000009b r2 : fee00103 r1 : 00000001 r0 : 8315b240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 87462b00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8315b240 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 8315b240 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 0xdfa8c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Register r12 information: 2-page vmalloc region starting at 0xdfa8c000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2746 Process syz.7.1178 (pid: 9989, stack limit = 0xdfa8c000) Stack: (0xdfa8dcb8 to 0xdfa8e000) dca0: 81488ba8 00000100 dcc0: 8315b240 00000000 dfa8dcf4 dfa8dcd8 814888e4 81488bb4 00000100 80544fcc dce0: 8623e000 8623e000 dfa8dd14 dfa8dcf8 81488c9c 81488898 8315b240 00000000 dd00: 8623e000 00000000 dfa8dd54 dfa8dd18 81488e4c 81488c20 ffffffff 00000004 dd20: 82a22d40 00000000 00000000 82bd6c80 8315b240 00000000 dfa8dd90 8315b240 dd40: 00000000 82d2c9b4 dfa8dd8c dfa8dd58 814777f0 81488de4 40946400 00000000 dd60: dfa8dd7c 200000c0 8315b240 b5403587 40946400 00000003 00000003 85849880 dd80: dfa8de4c dfa8dd90 81472ffc 814776f4 35353238 00000000 00000000 00000000 dda0: 00000000 00000100 0000007f 00000001 0000000c 00000011 00000005 00000079 ddc0: 00000003 00080008 00000009 00000002 00800001 00000006 00000001 00100001 dde0: 000000fd 0000001f 20000009 00000003 7fffffff ffffffff 0000ca9f fffffffb de00: 00200005 fffffffb 0000f39e ffffffff 00000008 000018c0 fffffffc fffffff8 de20: 00000000 da80c169 00000000 86e33280 8315b240 200000c0 40946400 00000003 de40: dfa8df14 dfa8de50 81474320 81472f34 00000000 da80c169 00000000 00000000 de60: 8254080c dfa8dea4 0000005f 844f4990 00000064 8315b270 dfa8dee4 dfa8de88 de80: 80802f88 807f92b8 00000064 00000001 00000000 dfa8dea4 867bcd10 834ee198 dea0: 00006400 0000000b dfa8de98 00000000 00000000 da80c169 00000000 86e33280 dec0: 40946400 200000c0 200000c0 86e33280 00000003 85849880 dfa8def4 dfa8dee8 dee0: 808030bc da80c169 dfa8df14 00000000 86e33281 40946400 200000c0 86e33280 df00: 00000003 85849880 dfa8dfa4 dfa8df18 805b9fc0 81473fd8 ecac8b10 85849880 df20: dfa8df3c dfa8df30 81b3e960 81b3e82c dfa8df54 dfa8df40 8025a7f0 8028e4c8 df40: dfa8dfb0 40000000 dfa8df84 dfa8df58 80220bdc 8025a7ac 00000000 82a1ea8c df60: dfa8dfb0 0013e9c0 ecac8b10 80220b30 00000000 da80c169 dfa8dfac 00000000 df80: 00000000 00346310 00000036 8020029c 85849880 00000036 00000000 dfa8dfa8 dfa0: 80200060 805b9d88 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc dfe0: 76fc8e88 76fc8e78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81488ba8>] (subdev_8255_io) from [<814888e4>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:8315b240 r5:00000100 r4:81488ba8 [<8148888c>] (subdev_8255_do_config) from [<81488c9c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<8148888c>] (subdev_8255_do_config) from [<81488c9c>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8623e000 [<81488c14>] (subdev_8255_io_init) from [<81488e4c>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81488c14>] (subdev_8255_io_init) from [<81488e4c>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:8623e000 r5:00000000 r4:8315b240 [<81488dd8>] (dev_8255_attach) from [<814777f0>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2c9b4 r9:00000000 r8:8315b240 r7:dfa8dd90 r6:00000000 r5:8315b240 r4:82bd6c80 [<814776e8>] (comedi_device_attach) from [<81472ffc>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:85849880 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8315b240 r4:200000c0 [<81472f28>] (do_devconfig_ioctl) from [<81474320>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:200000c0 r5:8315b240 r4:86e33280 [<81473fcc>] (comedi_unlocked_ioctl) from [<805b9fc0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81473fcc>] (comedi_unlocked_ioctl) from [<805b9fc0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81473fcc>] (comedi_unlocked_ioctl) from [<805b9fc0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81473fcc>] (comedi_unlocked_ioctl) from [<805b9fc0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85849880 r9:00000003 r8:86e33280 r7:200000c0 r6:40946400 r5:86e33281 r4:00000000 [<805b9d7c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa8dfa8 to 0xdfa8dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fc90dc dfe0: 76fc8e88 76fc8e78 00018ebc 00130820 r10:00000036 r9:85849880 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