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: 0 UID: 0 PID: 9886 Comm: syz.0.855 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : ea6edcb8 ip : ea6edcb8 fp : ea6edcd4 r10: 00000004 r9 : 00000004 r8 : ea6edda4 r7 : 00000000 r6 : 0000009b r5 : 8475ee40 r4 : 00000007 r3 : 0000009b r2 : fee00007 r1 : 00000001 r0 : 8475ee40 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86db6680 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8475ee40 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 8475ee40 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 0xea6ec000 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 0xea6ec000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xea6ec000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.0.855 (pid: 9886, stack limit = 0xea6ec000) Stack: (0xea6edcb8 to 0xea6ee000) dca0: 8149e2f8 00000004 dcc0: 8475ee40 00000000 ea6edcf4 ea6edcd8 8149e034 8149e304 00000004 80545e10 dce0: 84f73000 84f73000 ea6edd14 ea6edcf8 8149e3ec 8149dfe8 8475ee40 00000000 dd00: 84f73000 00000000 ea6edd54 ea6edd18 8149e59c 8149e370 ffffffff 00000004 dd20: 82a22dc0 00000000 00000000 82bd9600 8475ee40 00000000 ea6edd90 8475ee40 dd40: 00000000 82d30dfc ea6edd8c ea6edd58 8148cf3c 8149e534 40946400 00000000 dd60: ea6edd7c 200000c0 8475ee40 b5403587 40946400 00000003 00000003 84fc0c40 dd80: ea6ede4c ea6edd90 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 aee3c247 00000000 86beb780 8475ee40 200000c0 40946400 00000003 de40: ea6edf14 ea6ede50 81489a68 81488680 00000000 aee3c247 00000000 00000000 de60: 8254880c ea6edea4 0000005f 8493c058 00000064 8475ee70 ea6edee4 ea6ede88 de80: 80804fec 807fb31c 00000064 00000001 00000000 ea6edea4 87204110 834fd000 dea0: 00006400 0000000b ea6ede98 00000000 00000000 aee3c247 00000000 86beb780 dec0: 40946400 200000c0 200000c0 86beb780 00000003 84fc0c40 ea6edef4 ea6edee8 dee0: 80805120 aee3c247 ea6edf14 00000000 86beb781 40946400 200000c0 86beb780 df00: 00000003 84fc0c40 ea6edfa4 ea6edf18 805ba7e8 81489720 ecac8b10 84fc0c40 df20: ea6edf3c ea6edf30 81b54ac0 81b5498c ea6edf54 ea6edf40 8025a7ac 8028e488 df40: ea6edfb0 40000000 ea6edf84 ea6edf58 80220bdc 8025a768 00000000 82a1eb0c df60: ea6edfb0 0013e9c0 ecac8b10 80220b30 00000000 aee3c247 ea6edfac 00000000 df80: 00000000 00346310 00000036 8020029c 84fc0c40 00000036 00000000 ea6edfa8 dfa0: 80200060 805ba5b0 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f100dc dfe0: 76f0fe88 76f0fe78 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 r6:8475ee40 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) r4:84f73000 [<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 r6:84f73000 r5:00000000 r4:8475ee40 [<8149e528>] (dev_8255_attach) from [<8148cf3c>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r10:82d30dfc r9:00000000 r8:8475ee40 r7:ea6edd90 r6:00000000 r5:8475ee40 r4:82bd9600 [<8148ce34>] (comedi_device_attach) from [<81488740>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:84fc0c40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8475ee40 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 r5:8475ee40 r4:86beb780 [<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) r10:84fc0c40 r9:00000003 r8:86beb780 r7:200000c0 r6:40946400 r5:86beb781 r4:00000000 [<805ba5a4>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea6edfa8 to 0xea6edff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f100dc dfe0: 76f0fe88 76f0fe78 00018ebc 00130820 r10:00000036 r9:84fc0c40 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