8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2c when write [fee04f2c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6217 Comm: syz.1.614 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 : [<81415a14>] lr : [<81415a00>] psr: 60000013 sp : dfb75cb0 ip : dfb75cb0 fp : dfb75ccc r10: 00000001 r9 : 00000084 r8 : dfb75d9c r7 : 00004f29 r6 : 0000009b r5 : 8463c240 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 8463c240 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84c6e240 DAC: 00000000 Register r0 information: slab kmalloc-192 start 8463c240 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 8463c240 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 0xdfb74000 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 0xdfb74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb74000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.614 (pid: 6217, stack limit = 0xdfb74000) Stack: (0xdfb75cb0 to 0xdfb76000) 5ca0: 814159b4 8463c240 00004f29 00004f29 5cc0: dfb75cec dfb75cd0 814156ec 814159c0 00004f29 dfb75cf0 00000000 860f5000 5ce0: dfb75d0c dfb75cf0 81415aac 814156a0 8463c240 00000000 860f5000 00004f29 5d00: dfb75d4c dfb75d10 81415c58 81415a2c 8280cc60 83353980 828217b0 00000000 5d20: 00000000 829d46a0 8463c240 8463c284 dfb75d88 8463c240 00000000 82b28ad8 5d40: dfb75d84 dfb75d50 81404788 81415bf0 8463c270 00000000 dfb75d74 200000c0 5d60: 8463c240 b5403587 8463c270 85bcbc00 40946400 00000003 dfb75e44 dfb75d88 5d80: 814000e0 8140468c 35353238 00000000 00000000 00000000 00000000 00004f29 5da0: 00000005 00000003 00000004 00000001 0000000c 00001000 00000004 00000081 5dc0: fffffffc 00000002 fffffffe 00000001 0000002f 00000002 00000101 00000008 5de0: 00400009 00000003 00000005 00000099 0000caa7 00000080 00000000 00000007 5e00: 02000e67 0000003c 00000008 fffffffe 00000000 00000004 00000000 fc4f5bd2 5e20: 00000000 85ee8cc0 8463c240 200000c0 8463c270 85bcbc00 dfb75f14 dfb75e48 5e40: 814010d4 813fffec 00000000 00000000 00000000 00000000 00000000 fc4f5bd2 5e60: 00000000 00000000 824a35ec 0000005f 8406dde0 00000064 844d6cfc 85bcbc00 5e80: dfb75ee4 dfb75e90 807b7ea8 807ae3cc 00000064 00000001 00000000 dfb75eac 5ea0: 84c06910 834e0e58 00006400 0000000b dfb75ea0 00000000 00000000 fc4f5bd2 5ec0: 85ee8cc0 40946400 200000c0 200000c0 85ee8cc0 00000003 dfb75ef4 dfb75ee8 5ee0: 807b7fc8 fc4f5bd2 dfb75f14 40946400 00000000 85ee8cc1 200000c0 85ee8cc0 5f00: 00000003 85bcbc00 dfb75fa4 dfb75f18 805855f0 81400b24 ecac8b10 85bcbc00 5f20: dfb75f3c dfb75f30 81aaf74c 81aaf61c dfb75f54 dfb75f40 8025bcbc 8028e0c4 5f40: dfb75fb0 40000000 dfb75f84 dfb75f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfb75fb0 0014c880 ecac8b10 8022198c 00000000 fc4f5bd2 dfb75fac 00000000 5f80: 00000000 00316310 00000036 8020029c 85bcbc00 00000036 00000000 dfb75fa8 5fa0: 80200060 805854cc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f2b0bc 5fe0: 76f2aec0 76f2aeb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<814159b4>] (subdev_8255_io) from [<814156ec>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00004f29 r6:00004f29 r5:8463c240 r4:814159b4 [<81415694>] (subdev_8255_do_config) from [<81415aac>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415694>] (subdev_8255_do_config) from [<81415aac>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:860f5000 [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<81415a20>] (subdev_8255_io_init) from [<81415c58>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00004f29 r6:860f5000 r5:00000000 r4:8463c240 [<81415be4>] (dev_8255_attach) from [<81404788>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8463c240 r7:dfb75d88 r6:8463c284 r5:8463c240 r4:829d46a0 [<81404680>] (comedi_device_attach) from [<814000e0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:85bcbc00 r7:8463c270 r6:b5403587 r5:8463c240 r4:200000c0 [<813fffe0>] (do_devconfig_ioctl) from [<814010d4>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:85bcbc00 r7:8463c270 r6:200000c0 r5:8463c240 r4:85ee8cc0 [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400b18>] (comedi_unlocked_ioctl) from [<805855f0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85bcbc00 r9:00000003 r8:85ee8cc0 r7:200000c0 r6:85ee8cc1 r5:00000000 r4:40946400 [<805854c0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb75fa8 to 0xdfb75ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76f2b0bc 5fe0: 76f2aec0 76f2aeb0 0001929c 00132320 r10:00000036 r9:85bcbc00 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