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: 0 UID: 0 PID: 10653 Comm: syz.3.1759 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: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 : [<81415834>] lr : [<81415820>] psr: 60000013 sp : dfbe1cb0 ip : dfbe1cb0 fp : dfbe1ccc r10: 00000001 r9 : 00000084 r8 : dfbe1d9c r7 : 00004f27 r6 : 0000009b r5 : 845bb780 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 845bb780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8b8c2ac0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 845bb780 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 845bb780 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 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r9 information: non-paged memory Register r10 information: non-paged memory Register r11 information: 2-page vmalloc region starting at 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfbe0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.3.1759 (pid: 10653, stack limit = 0xdfbe0000) Stack: (0xdfbe1cb0 to 0xdfbe2000) 1ca0: 814157d4 845bb780 00004f27 00004f27 1cc0: dfbe1cec dfbe1cd0 8141550c 814157e0 00004f27 80514f2c 858fa000 858fa000 1ce0: dfbe1d0c dfbe1cf0 814158cc 814154c0 845bb780 00000000 858fa000 00004f27 1d00: dfbe1d4c dfbe1d10 81415a78 8141584c 8280cc60 8bca6200 828217b0 00000000 1d20: 00000000 829d46a0 845bb780 845bb7c4 dfbe1d88 845bb780 00000000 82b28ad8 1d40: dfbe1d84 dfbe1d50 814045a8 81415a10 845bb7b0 00000000 dfbe1d74 200000c0 1d60: 845bb780 b5403587 845bb7b0 83e90c00 40946400 00000003 dfbe1e44 dfbe1d88 1d80: 813fff00 814044ac 35353238 00000000 00000000 00000000 00000000 00004f27 1da0: 00000005 00000022 00000401 00000001 00006dc2 00000fff 5c95239c 00000005 1dc0: 000003ff 00000802 000003ff 00000001 00000002 00000009 0000e1cb 00000005 1de0: 00000004 00000003 00000395 80000089 fffffffe 0000000a fffffff5 0000002f 1e00: 00000003 00000000 00000000 00000004 08000000 dffffffa 00000000 52bc0bbf 1e20: 00000000 85ae4780 845bb780 200000c0 845bb7b0 83e90c00 dfbe1f14 dfbe1e48 1e40: 81400ef4 813ffe0c 00000000 00000000 00000000 00000000 00000000 52bc0bbf 1e60: 00000000 00000000 824a35ec 0000005f 84045be8 00000064 845e87ec 83e90c00 1e80: dfbe1ee4 dfbe1e90 807b7da0 807ae2c4 00000064 00000001 00000000 dfbe1eac 1ea0: 85f45c10 834eb6e8 00006400 0000000b dfbe1ea0 00000000 00000000 52bc0bbf 1ec0: 85ae4780 40946400 200000c0 200000c0 85ae4780 00000003 dfbe1ef4 dfbe1ee8 1ee0: 807b7ec0 52bc0bbf dfbe1f14 40946400 00000000 85ae4781 200000c0 85ae4780 1f00: 00000003 83e90c00 dfbe1fa4 dfbe1f18 8058553c 81400944 ecac8b10 83e90c00 1f20: dfbe1f3c dfbe1f30 81aaf3bc 81aaf28c dfbe1f54 dfbe1f40 8025bcbc 8028e0c4 1f40: dfbe1fb0 40000000 dfbe1f84 dfbe1f58 80221a38 8025bc78 00000000 8281d17c 1f60: dfbe1fb0 0014c880 ecac8b10 8022198c 00000000 52bc0bbf dfbe1fac 00000000 1f80: 00000000 00316310 00000036 8020029c 83e90c00 00000036 00000000 dfbe1fa8 1fa0: 80200060 80585418 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f440bc 1fe0: 76f43ec0 76f43eb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814157d4>] (subdev_8255_io) from [<8141550c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:845bb780 r4:814157d4 [<814154b4>] (subdev_8255_do_config) from [<814158cc>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814154b4>] (subdev_8255_do_config) from [<814158cc>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:858fa000 [<81415840>] (subdev_8255_io_init) from [<81415a78>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415840>] (subdev_8255_io_init) from [<81415a78>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:858fa000 r5:00000000 r4:845bb780 [<81415a04>] (dev_8255_attach) from [<814045a8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:845bb780 r7:dfbe1d88 r6:845bb7c4 r5:845bb780 r4:829d46a0 [<814044a0>] (comedi_device_attach) from [<813fff00>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83e90c00 r7:845bb7b0 r6:b5403587 r5:845bb780 r4:200000c0 [<813ffe00>] (do_devconfig_ioctl) from [<81400ef4>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83e90c00 r7:845bb7b0 r6:200000c0 r5:845bb780 r4:85ae4780 [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400938>] (comedi_unlocked_ioctl) from [<8058553c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83e90c00 r9:00000003 r8:85ae4780 r7:200000c0 r6:85ae4781 r5:00000000 r4:40946400 [<8058540c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbe1fa8 to 0xdfbe1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f440bc 1fe0: 76f43ec0 76f43eb0 0001929c 00132320 r10:00000036 r9:83e90c00 r8:8020029c r7:00000036 r6:00316310 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