8<--- cut here --- Unable to handle kernel paging request at virtual address fee09003 when write [fee09003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4164 Comm: syz.0.86 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 : [<81466d70>] lr : [<81466d5c>] psr: 60000013 sp : df94dcb8 ip : df94dcb8 fp : df94dcd4 r10: 00009000 r9 : 00000004 r8 : df94dda4 r7 : 00000000 r6 : 0000009b r5 : 845b73c0 r4 : 00009003 r3 : 0000009b r2 : fee09003 r1 : 00000001 r0 : 845b73c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860d6d00 DAC: fffffffd Register r0 information: slab kmalloc-192 start 845b73c0 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 845b73c0 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 0xdf94c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdf94c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdf94c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.0.86 (pid: 4164, stack limit = 0xdf94c000) Stack: (0xdf94dcb8 to 0xdf94e000) dca0: 81466d10 00009000 dcc0: 845b73c0 00000000 df94dcf4 df94dcd8 81466a4c 81466d1c 00009000 80532614 dce0: 85f90000 85f90000 df94dd14 df94dcf8 81466e04 81466a00 845b73c0 00000000 dd00: 85f90000 00000000 df94dd54 df94dd18 81466fb4 81466d88 ffffffff 00000004 dd20: 82a20900 00000000 00000000 82bd3438 845b73c0 00000000 df94dd90 845b73c0 dd40: 00000000 82d2cdc4 df94dd8c df94dd58 81455940 81466f4c 40946400 00000000 dd60: df94dd7c 20000140 845b73c0 b5403587 40946400 00000001 00000006 850a3e80 dd80: df94de4c df94dd90 8145114c 81455844 35353238 00000000 00000000 00000000 dda0: 00000000 00009000 00000001 00000a1a 00000004 00000004 0800afa3 00000004 ddc0: 00000008 00005857 00000002 00000007 00000009 00000001 00000005 00000006 dde0: 00000501 00000000 00000004 00000002 0000000a 00000008 0000caa2 00001003 de00: 20001e5b 02000003 00000e69 00000002 00000004 00004086 00000000 00000004 de20: 00000000 e18da186 00000000 83e95d80 845b73c0 20000140 40946400 00000001 de40: df94df14 df94de50 81452470 81451084 00000000 e18da186 00000000 00000000 de60: 82531804 df94dea4 0000005f 841945e0 00000064 845b73f0 df94dee4 df94de88 de80: 807ea2d4 807e05e8 00000064 00000001 00000000 df94dea4 8335c790 834d45d8 dea0: 00006400 0000000b df94de98 00000000 00000000 e18da186 00000000 83e95d80 dec0: 40946400 20000140 20000140 83e95d80 00000006 850a3e80 df94def4 df94dee8 dee0: 807ea408 e18da186 df94df14 00000000 83e95d81 40946400 20000140 83e95d80 df00: 00000006 850a3e80 df94dfa4 df94df18 805a1c5c 81452128 ecac8b10 850a3e80 df20: df94df3c df94df30 81b18714 81b185e0 df94df54 df94df40 8025a6bc 8028e2a4 df40: df94dfb0 40000000 df94df84 df94df58 80220be0 8025a678 00000000 82a1c63c df60: df94dfb0 0013e9b0 ecac8b10 80220b34 00000000 e18da186 df94dfac 00000000 df80: 00000000 00346450 00000036 8020029c 850a3e80 00000036 00000000 df94dfa8 dfa0: 80200060 805a1a24 00000000 00000000 00000006 40946400 20000140 00000000 dfc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f450dc dfe0: 76f44e88 76f44e78 00018ebc 00130810 60000010 00000006 00000000 00000000 Call trace: [<81466d10>] (subdev_8255_io) from [<81466a4c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000000 r6:845b73c0 r5:00009000 r4:81466d10 [<814669f4>] (subdev_8255_do_config) from [<81466e04>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814669f4>] (subdev_8255_do_config) from [<81466e04>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:85f90000 [<81466d7c>] (subdev_8255_io_init) from [<81466fb4>] (dev_8255_attach drivers/comedi/drivers/8255.c:84 [inline]) [<81466d7c>] (subdev_8255_io_init) from [<81466fb4>] (dev_8255_attach+0x74/0x138 drivers/comedi/drivers/8255.c:46) r7:00000000 r6:85f90000 r5:00000000 r4:845b73c0 [<81466f40>] (dev_8255_attach) from [<81455940>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d2cdc4 r9:00000000 r8:845b73c0 r7:df94dd90 r6:00000000 r5:845b73c0 r4:82bd3438 [<81455838>] (comedi_device_attach) from [<8145114c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:850a3e80 r9:00000006 r8:00000001 r7:40946400 r6:b5403587 r5:845b73c0 r4:20000140 [<81451078>] (do_devconfig_ioctl) from [<81452470>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000001 r7:40946400 r6:20000140 r5:845b73c0 r4:83e95d80 [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:850a3e80 r9:00000006 r8:83e95d80 r7:20000140 r6:40946400 r5:83e95d81 r4:00000000 [<805a1a18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf94dfa8 to 0xdf94dff0) dfa0: 00000000 00000000 00000006 40946400 20000140 00000000 dfc0: 00000000 00000000 00346450 00000036 00346418 00000000 00000001 76f450dc dfe0: 76f44e88 76f44e78 00018ebc 00130810 r10:00000036 r9:850a3e80 r8:8020029c r7:00000036 r6:00346450 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