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: 9955 Comm: syz.1.1148 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 : ea575cb0 ip : ea575cb0 fp : ea575ccc r10: 00000001 r9 : 00000084 r8 : ea575d9c r7 : 00004f27 r6 : 0000009b r5 : 84598300 r4 : 00004f2a r3 : 0000009b r2 : fee04f2a r1 : 00000001 r0 : 84598300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84e10400 DAC: fffffffd Register r0 information: slab kmalloc-192 start 84598300 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 84598300 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 0xea574000 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 0xea574000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea574000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.1148 (pid: 9955, stack limit = 0xea574000) Stack: (0xea575cb0 to 0xea576000) 5ca0: 81415c0c 84598300 00004f27 00004f27 5cc0: ea575cec ea575cd0 81415944 81415c18 00004f27 80514fcc 85beb000 85beb000 5ce0: ea575d0c ea575cf0 81415d04 814158f8 84598300 00000000 85beb000 00004f27 5d00: ea575d4c ea575d10 81415eb0 81415c84 ea575d34 ea575d20 81ab3c38 00000000 5d20: 81400288 829d46a0 84598300 84598344 ea575d88 84598300 00000000 82b28ad8 5d40: ea575d84 ea575d50 814049e0 81415e48 84598330 00000000 ea575d74 200000c0 5d60: 84598300 b5403587 84598330 8321ec00 40946400 00000003 ea575e44 ea575d88 5d80: 81400338 814048e4 35353238 00000000 00000000 00000000 00000000 00004f27 5da0: 00000005 08081022 00000401 00000001 00006dc2 00000ffe 00000005 0000006c 5dc0: 000003df 0000200e 000003ff 00000004 fffff350 00000009 00000109 00000004 5de0: 00000000 00000002 00000003 80000089 fffffffe 00000008 fffffff5 00008000 5e00: 00000000 000003a2 00000000 00001e9f 000000c6 00000002 00000000 5e9c54eb 5e20: 00000000 85fba900 84598300 200000c0 84598330 8321ec00 ea575f14 ea575e48 5e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 5e9c54eb 5e60: 00000000 00000000 824a35ec 0000005f 845f6838 00000064 845947a4 8321ec00 5e80: ea575ee4 ea575e90 807b7f80 807ae4a4 00000064 00000001 00000000 ea575eac 5ea0: 85c33250 834edc38 00006400 0000000b ea575ea0 00000000 00000000 5e9c54eb 5ec0: 85fba900 40946400 200000c0 200000c0 85fba900 00000003 ea575ef4 ea575ee8 5ee0: 807b80a0 5e9c54eb ea575f14 40946400 00000000 85fba901 200000c0 85fba900 5f00: 00000003 8321ec00 ea575fa4 ea575f18 80585608 81400d7c ecac8b10 8321ec00 5f20: ea575f3c ea575f30 81aaf9ac 81aaf87c ea575f54 ea575f40 8025bcbc 8028e0c4 5f40: ea575fb0 40000000 ea575f84 ea575f58 80221a38 8025bc78 00000000 8281d17c 5f60: ea575fb0 0014c8c0 ecac8b10 8022198c 00000000 5e9c54eb ea575fac 00000000 5f80: 00000000 00326310 00000036 8020029c 8321ec00 00000036 00000000 ea575fa8 5fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76ff80bc 5fe0: 76ff7ec0 76ff7eb0 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 r5:84598300 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) r4:85beb000 [<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 r6:85beb000 r5:00000000 r4:84598300 [<81415e3c>] (dev_8255_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:84598300 r7:ea575d88 r6:84598344 r5:84598300 r4:829d46a0 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:8321ec00 r7:84598330 r6:b5403587 r5:84598300 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:8321ec00 r7:84598330 r6:200000c0 r5:84598300 r4:85fba900 [<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) r10:8321ec00 r9:00000003 r8:85fba900 r7:200000c0 r6:85fba901 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea575fa8 to 0xea575ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76ff80bc 5fe0: 76ff7ec0 76ff7eb0 000192bc 00132360 r10:00000036 r9:8321ec00 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