8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10214 Comm: syz.6.1348 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 : [<8143a268>] lr : [<8143a254>] psr: 60000013 sp : e03bdcb8 ip : e03bdcb8 fp : e03bdcd4 r10: 00000000 r9 : 00000084 r8 : e03bdda4 r7 : 00004f27 r6 : 0000009b r5 : 8458b0c0 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 8458b0c0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8749df80 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8458b0c0 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 8458b0c0 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 0xe03bc000 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 0xe03bc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe03bc000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.6.1348 (pid: 10214, stack limit = 0xe03bc000) Stack: (0xe03bdcb8 to 0xe03be000) dca0: 8143a208 00004f27 dcc0: 8458b0c0 00004f27 e03bdcf4 e03bdcd8 81439f44 8143a214 00004f27 80522490 dce0: 8635b000 8635b000 e03bdd14 e03bdcf8 8143a2fc 81439ef8 8458b0c0 00000000 dd00: 8635b000 00004f27 e03bdd54 e03bdd18 8143a4ac 8143a280 82b123f4 83899e80 dd20: 828217c0 00000000 00000000 829d6d84 8458b0c0 00000000 e03bdd90 8458b0c0 dd40: 00000000 82b2efdc e03bdd8c e03bdd58 81428de4 8143a444 40946400 00000000 dd60: e03bdd7c 20000600 8458b0c0 b5403587 40946400 00000003 00000003 83f80000 dd80: e03bde4c e03bdd90 814245f8 81428ce4 35353238 00000000 00000000 00000000 dda0: 00000000 00004f27 00000002 00000003 0000c466 00000004 00000cc7 000000c9 ddc0: 5c952399 00000005 00001000 00000802 00001607 00000001 00000006 0000000c dde0: 00000081 00006fd5 00000004 00000003 00000000 00000008 fffffffd fffffffd de00: fffffff5 00000009 00000003 00010002 00000008 00000000 08000000 00000006 de20: 00000000 845493ec 83f80000 860ca780 8458b0c0 20000600 40946400 00000003 de40: e03bdf14 e03bde50 8142591c 81424530 00000000 845493ec 00000000 00000000 de60: 824b657c e03bdea4 0000005f 840fc640 00000064 8458b0f0 e03bdee4 e03bde88 de80: 807cd6ec 807c3ac4 00000064 00000001 00000000 e03bdea4 833b2310 834e93b8 dea0: 00006400 0000000b e03bde98 00000000 00000000 845493ec 00000000 860ca780 dec0: 40946400 20000600 20000600 860ca780 00000003 83f80000 e03bdef4 e03bdee8 dee0: 807cd81c 845493ec e03bdf14 00000000 860ca781 40946400 20000600 860ca780 df00: 00000003 83f80000 e03bdfa4 e03bdf18 8058f600 814255d4 ecac8b10 83f80000 df20: e03bdf3c e03bdf30 81add2f4 81add1c0 e03bdf54 e03bdf40 8025a85c 8028c030 df40: e03bdfb0 40000000 e03bdf84 e03bdf58 80220bf8 8025a818 00000000 8281d2bc df60: e03bdfb0 0013e290 ecac8b10 80220b4c 00000000 845493ec e03bdfac 00000000 df80: 00000000 00346310 00000036 8020029c 83f80000 00000036 00000000 e03bdfa8 dfa0: 80200060 8058f3c8 00000000 00000000 00000003 40946400 20000600 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76feb0dc dfe0: 76feae88 76feae78 00018ba0 001300f0 60000010 00000003 00000000 00000000 Call trace: [<8143a208>] (subdev_8255_io) from [<81439f44>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:8458b0c0 r5:00004f27 r4:8143a208 [<81439eec>] (subdev_8255_do_config) from [<8143a2fc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81439eec>] (subdev_8255_do_config) from [<8143a2fc>] (subdev_8255_io_init+0x88/0x98 drivers/comedi/drivers/comedi_8255.c:192) r4:8635b000 [<8143a274>] (subdev_8255_io_init) from [<8143a4ac>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<8143a274>] (subdev_8255_io_init) from [<8143a4ac>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8635b000 r5:00000000 r4:8458b0c0 [<8143a438>] (dev_8255_attach) from [<81428de4>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r10:82b2efdc r9:00000000 r8:8458b0c0 r7:e03bdd90 r6:00000000 r5:8458b0c0 r4:829d6d84 [<81428cd8>] (comedi_device_attach) from [<814245f8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83f80000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8458b0c0 r4:20000600 [<81424524>] (do_devconfig_ioctl) from [<8142591c>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000600 r5:8458b0c0 r4:860ca780 [<814255c8>] (comedi_unlocked_ioctl) from [<8058f600>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814255c8>] (comedi_unlocked_ioctl) from [<8058f600>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814255c8>] (comedi_unlocked_ioctl) from [<8058f600>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814255c8>] (comedi_unlocked_ioctl) from [<8058f600>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83f80000 r9:00000003 r8:860ca780 r7:20000600 r6:40946400 r5:860ca781 r4:00000000 [<8058f3bc>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03bdfa8 to 0xe03bdff0) dfa0: 00000000 00000000 00000003 40946400 20000600 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76feb0dc dfe0: 76feae88 76feae78 00018ba0 001300f0 r10:00000036 r9:83f80000 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