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: 0 UID: 0 PID: 11046 Comm: syz.6.1585 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 : dfe15cb0 ip : dfe15cb0 fp : dfe15ccc r10: 00000001 r9 : 00000084 r8 : dfe15d9c r7 : 00004f29 r6 : 0000009b r5 : 8454ac00 r4 : 00004f2c r3 : 0000009b r2 : fee04f2c r1 : 00000001 r0 : 8454ac00 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84d7c140 DAC: fffffffd Register r0 information: slab kmalloc-192 start 8454ac00 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 8454ac00 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 0xdfe14000 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 0xdfe14000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfe14000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.6.1585 (pid: 11046, stack limit = 0xdfe14000) Stack: (0xdfe15cb0 to 0xdfe16000) 5ca0: 81415c0c 8454ac00 00004f29 00004f29 5cc0: dfe15cec dfe15cd0 81415944 81415c18 00004f29 80514fcc 854f4000 854f4000 5ce0: dfe15d0c dfe15cf0 81415d04 814158f8 8454ac00 00000000 854f4000 00004f29 5d00: dfe15d4c dfe15d10 81415eb0 81415c84 8280cc60 84aba800 828217b0 00000000 5d20: 00000000 829d46a0 8454ac00 8454ac44 dfe15d88 8454ac00 00000000 82b28ad8 5d40: dfe15d84 dfe15d50 814049e0 81415e48 8454ac30 00000000 dfe15d74 200000c0 5d60: 8454ac00 b5403587 8454ac30 86afa400 40946400 00000003 dfe15e44 dfe15d88 5d80: 81400338 814048e4 35353238 00000000 00000000 00000000 00000000 00004f29 5da0: 00000005 00000006 00000004 00000001 0000000b fffffffd 00000002 00000081 5dc0: fffffffc 00000002 fffffffe 00000001 00000001 00800061 00000101 00000002 5de0: 00400009 00000009 00000006 00000099 01000000 00000080 000004b0 00000007 5e00: 02000e69 00000007 00080004 fffffffe 00000000 fffffff8 00000000 3c88e86d 5e20: 00000000 84b76780 8454ac00 200000c0 8454ac30 86afa400 dfe15f14 dfe15e48 5e40: 8140132c 81400244 00000000 00000000 00000000 00000000 00000000 3c88e86d 5e60: 00000000 00000000 824a35ec 0000005f 8457b7f8 00000064 844f6834 86afa400 5e80: dfe15ee4 dfe15e90 807b7f80 807ae4a4 00000064 00000001 00000000 dfe15eac 5ea0: 878c9cd0 834f45d8 00006400 0000000b dfe15ea0 00000000 00000000 3c88e86d 5ec0: 84b76780 40946400 200000c0 200000c0 84b76780 00000003 dfe15ef4 dfe15ee8 5ee0: 807b80a0 3c88e86d dfe15f14 40946400 00000000 84b76781 200000c0 84b76780 5f00: 00000003 86afa400 dfe15fa4 dfe15f18 80585608 81400d7c ecac8b10 86afa400 5f20: dfe15f3c dfe15f30 81aaf9ac 81aaf87c dfe15f54 dfe15f40 8025bcbc 8028e0c4 5f40: dfe15fb0 40000000 dfe15f84 dfe15f58 80221a38 8025bc78 00000000 8281d17c 5f60: dfe15fb0 0014c8c0 ecac8b10 8022198c 00000000 3c88e86d dfe15fac 00000000 5f80: 00000000 00326310 00000036 8020029c 86afa400 00000036 00000000 dfe15fa8 5fa0: 80200060 805854e4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f040bc 5fe0: 76f03ec0 76f03eb0 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) r7:00004f29 r6:00004f29 r5:8454ac00 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) r4:854f4000 [<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) r7:00004f29 r6:854f4000 r5:00000000 r4:8454ac00 [<81415e3c>] (dev_8255_attach) from [<814049e0>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:8454ac00 r7:dfe15d88 r6:8454ac44 r5:8454ac00 r4:829d46a0 [<814048d8>] (comedi_device_attach) from [<81400338>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:86afa400 r7:8454ac30 r6:b5403587 r5:8454ac00 r4:200000c0 [<81400238>] (do_devconfig_ioctl) from [<8140132c>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:86afa400 r7:8454ac30 r6:200000c0 r5:8454ac00 r4:84b76780 [<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) r10:86afa400 r9:00000003 r8:84b76780 r7:200000c0 r6:84b76781 r5:00000000 r4:40946400 [<805854d8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfe15fa8 to 0xdfe15ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f040bc 5fe0: 76f03ec0 76f03eb0 000192bc 00132360 r10:00000036 r9:86afa400 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