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: 14598 Comm: syz.2.2987 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 : [<81415ad4>] lr : [<81415ac0>] psr: 60000013 sp : df9ddcb0 ip : df9ddcb0 fp : df9ddccc r10: 00000001 r9 : 00000084 r8 : df9ddd9c r7 : 00004f27 r6 : 0000009b r5 : 84525600 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84525600 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85fe0480 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84525600 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 84525600 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 0xdf9dc000 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 0xdf9dc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf9dc000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.2.2987 (pid: 14598, stack limit = 0xdf9dc000) Stack: (0xdf9ddcb0 to 0xdf9de000) dca0: 81415a74 84525600 00004f27 00004f27 dcc0: df9ddcec df9ddcd0 814157ac 81415a80 00004f27 80514fb4 84bf9800 84bf9800 dce0: df9ddd0c df9ddcf0 81415b6c 81415760 84525600 00000000 84bf9800 00004f27 dd00: df9ddd4c df9ddd10 81415d18 81415aec 8280cc60 838e8a00 828217b0 00000000 dd20: 00000000 829d46a0 84525600 84525644 df9ddd88 84525600 00000000 82b28ad8 dd40: df9ddd84 df9ddd50 81404848 81415cb0 84525630 00000000 df9ddd74 200000c0 dd60: 84525600 b5403587 84525630 84db0c00 40946400 00000003 df9dde44 df9ddd88 dd80: 814001a0 8140474c 35353238 00000000 00000000 00000000 00000000 00004f27 dda0: 00000005 00000002 00000401 00000000 00000cc7 00000fff 5c952399 00000005 ddc0: 000003ff 00000802 00001600 00000001 00000001 00000009 0000e1cb 00000006 dde0: 00000004 00000003 00000395 80000089 fffffffd 0000002f fffffff5 ffffeadb de00: 00000003 0000003c 00000008 00000004 08000000 dffffffa 00000000 ffc0b2ae de20: 00000000 853ab6c0 84525600 200000c0 84525630 84db0c00 df9ddf14 df9dde48 de40: 81401194 814000ac 00000000 00000000 00000000 00000000 00000000 ffc0b2ae de60: 00000000 00000000 824a35ec 0000005f 844d0058 00000064 8462612c 84db0c00 de80: df9ddee4 df9dde90 807b7f68 807ae48c 00000064 00000001 00000000 df9ddeac dea0: 85d66610 83439660 00006400 0000000b df9ddea0 00000000 00000000 ffc0b2ae dec0: 853ab6c0 40946400 200000c0 200000c0 853ab6c0 00000003 df9ddef4 df9ddee8 dee0: 807b8088 ffc0b2ae df9ddf14 40946400 00000000 853ab6c1 200000c0 853ab6c0 df00: 00000003 84db0c00 df9ddfa4 df9ddf18 805855f0 81400be4 ecac8b10 84db0c00 df20: df9ddf3c df9ddf30 81aaf80c 81aaf6dc df9ddf54 df9ddf40 8025bcbc 8028e0c4 df40: df9ddfb0 40000000 df9ddf84 df9ddf58 80221a38 8025bc78 00000000 8281d17c df60: df9ddfb0 0014c8c0 ecac8b10 8022198c 00000000 ffc0b2ae df9ddfac 00000000 df80: 00000000 00326310 00000036 8020029c 84db0c00 00000036 00000000 df9ddfa8 dfa0: 80200060 805854cc 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f790bc dfe0: 76f78ec0 76f78eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81415a74>] (subdev_8255_io) from [<814157ac>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f27 r6:00004f27 r5:84525600 r4:81415a74 [<81415754>] (subdev_8255_do_config) from [<81415b6c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415754>] (subdev_8255_do_config) from [<81415b6c>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:84bf9800 [<81415ae0>] (subdev_8255_io_init) from [<81415d18>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415ae0>] (subdev_8255_io_init) from [<81415d18>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f27 r6:84bf9800 r5:00000000 r4:84525600 [<81415ca4>] (dev_8255_attach) from [<81404848>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:84525600 r7:df9ddd88 r6:84525644 r5:84525600 r4:829d46a0 [<81404740>] (comedi_device_attach) from [<814001a0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:84db0c00 r7:84525630 r6:b5403587 r5:84525600 r4:200000c0 [<814000a0>] (do_devconfig_ioctl) from [<81401194>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84db0c00 r7:84525630 r6:200000c0 r5:84525600 r4:853ab6c0 [<81400bd8>] (comedi_unlocked_ioctl) from [<805855f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400bd8>] (comedi_unlocked_ioctl) from [<805855f0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400bd8>] (comedi_unlocked_ioctl) from [<805855f0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400bd8>] (comedi_unlocked_ioctl) from [<805855f0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84db0c00 r9:00000003 r8:853ab6c0 r7:200000c0 r6:853ab6c1 r5:00000000 r4:40946400 [<805854c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9ddfa8 to 0xdf9ddff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f790bc dfe0: 76f78ec0 76f78eb0 000192bc 00132360 r10:00000036 r9:84db0c00 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