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: 11724 Comm: syz.1.1529 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 : [<81415c6c>] lr : [<81415c58>] psr: 60000013 sp : dfd91cb0 ip : dfd91cb0 fp : dfd91ccc r10: 00000001 r9 : 00000084 r8 : dfd91d9c r7 : 00004f27 r6 : 0000009b r5 : 84598780 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84598780 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84e00ac0 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84598780 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 84598780 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 0xdfd90000 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 0xdfd90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfd90000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.1529 (pid: 11724, stack limit = 0xdfd90000) Stack: (0xdfd91cb0 to 0xdfd92000) 1ca0: 81415c0c 84598780 00004f27 00004f27 1cc0: dfd91cec dfd91cd0 81415944 81415c18 00004f27 80514fcc 8533a800 8533a800 1ce0: dfd91d0c dfd91cf0 81415d04 814158f8 84598780 00000000 8533a800 00004f27 1d00: dfd91d4c dfd91d10 81415eb0 81415c84 8280cc60 832c8800 828217b0 00000000 1d20: 00000000 829d46a0 84598780 845987c4 dfd91d88 84598780 00000000 82b28ad8 1d40: dfd91d84 dfd91d50 814049e0 81415e48 845987b0 00000000 dfd91d74 200000c0 1d60: 84598780 b5403587 845987b0 83919800 40946400 00000003 dfd91e44 dfd91d88 1d80: 81400338 814048e4 35353238 00000000 00000000 00000000 00000000 00004f27 1da0: 00000005 00000002 00000401 00000021 00000007 00000fff 5c952399 00000005 1dc0: 000003ff 00000000 00000005 00000001 00000000 00000009 0000e1cb 00000004 1de0: 00000004 00000003 00000395 80000089 00000002 00000004 0000000a ffffeadb 1e00: 00000001 80000000 00000008 7ffffffd 08000000 00000001 00000000 10b559ed 1e20: 00000000 86a78240 84598780 200000c0 845987b0 83919800 dfd91f14 dfd91e48 1e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 10b559ed 1e60: 00000000 00000000 824a35ec 0000005f 843a2640 00000064 845bc294 83919800 1e80: dfd91ee4 dfd91e90 807b7f80 807ae4a4 00000064 00000001 00000000 dfd91eac 1ea0: 85e4c190 83432220 00006400 0000000b dfd91ea0 00000000 00000000 10b559ed 1ec0: 86a78240 40946400 200000c0 200000c0 86a78240 00000003 dfd91ef4 dfd91ee8 1ee0: 807b80a0 10b559ed dfd91f14 40946400 00000000 86a78241 200000c0 86a78240 1f00: 00000003 83919800 dfd91fa4 dfd91f18 80585608 81400d7c ecac8b10 83919800 1f20: dfd91f3c dfd91f30 81aaf9ac 81aaf87c dfd91f54 dfd91f40 8025bcbc 8028e0c4 1f40: dfd91fb0 40000000 dfd91f84 dfd91f58 80221a38 8025bc78 00000000 8281d17c 1f60: dfd91fb0 0014c8c0 ecac8b10 8022198c 00000000 10b559ed dfd91fac 00000000 1f80: 00000000 00326310 00000036 8020029c 83919800 00000036 00000000 dfd91fa8 1fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fef0bc 1fe0: 76feeec0 76feeeb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81415c0c>] (subdev_8255_io) from [<81415944>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:84598780 r4:81415c0c [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<814158ec>] (subdev_8255_do_config) from [<81415d04>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:8533a800 [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415c78>] (subdev_8255_io_init) from [<81415eb0>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:8533a800 r5:00000000 r4:84598780 [<81415e3c>] (dev_8255_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:84598780 r7:dfd91d88 r6:845987c4 r5:84598780 r4:829d46a0 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83919800 r7:845987b0 r6:b5403587 r5:84598780 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83919800 r7:845987b0 r6:200000c0 r5:84598780 r4:86a78240 [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400d70>] (comedi_unlocked_ioctl) from [<80585608>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83919800 r9:00000003 r8:86a78240 r7:200000c0 r6:86a78241 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd91fa8 to 0xdfd91ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fef0bc 1fe0: 76feeec0 76feeeb0 000192bc 00132360 r10:00000036 r9:83919800 r8:8020029c r7:00000036 r6:00326310 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