8<--- cut here --- Unable to handle kernel paging request at virtual address fee00f2a when write [fee00f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10587 Comm: syz.1.1465 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 : [<814162b4>] lr : [<814162a0>] psr: 60000013 sp : e0181cb0 ip : e0181cb0 fp : e0181ccc r10: 00000001 r9 : 00000084 r8 : e0181d9c r7 : 00000f27 r6 : 0000009b r5 : 843a8900 r4 : 00000f2a r3 : 0000009b r2 : fee00f2a r1 : 00000001 r0 : 843a8900 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8666e580 DAC: 00000000 Register r0 information: slab kmalloc-192 start 843a8900 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 843a8900 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 0xe0180000 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 0xe0180000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe0180000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.1465 (pid: 10587, stack limit = 0xe0180000) Stack: (0xe0181cb0 to 0xe0182000) 1ca0: 81416254 843a8900 00000f27 00000f27 1cc0: e0181cec e0181cd0 81415f8c 81416260 00000f27 805150ac 86d7f000 86d7f000 1ce0: e0181d0c e0181cf0 8141634c 81415f40 843a8900 00000000 86d7f000 00000f27 1d00: e0181d4c e0181d10 814164f8 814162cc 8280cc60 844d7c80 828217b0 00000000 1d20: 00000000 829d46a0 843a8900 843a8944 e0181d88 843a8900 00000000 82b28ad8 1d40: e0181d84 e0181d50 8140502c 81416490 843a8930 00000000 e0181d74 200000c0 1d60: 843a8900 b5403587 843a8930 83e98000 40946400 00000003 e0181e44 e0181d88 1d80: 81400984 81404f30 35353238 00000000 00000000 00000000 00000000 00000f27 1da0: 80000000 00000002 0000000a 0000000d 00000005 00000008 00000004 00000004 1dc0: 000000fd 00000004 00000001 00000001 00000001 00100006 00000101 12000000 1de0: 0000007f 00000003 40000003 0000008c 0000ca9f 00000000 fffffff9 ffffffff 1e00: 00000e66 00000013 00000008 00004089 00000008 00000006 00000000 faed7969 1e20: 00000000 864b4f00 843a8900 200000c0 843a8930 83e98000 e0181f14 e0181e48 1e40: 81401978 81400890 00000000 00000000 00000000 00000000 00000000 faed7969 1e60: 00000000 00000000 824a45ec 0000005f 83f8c640 00000064 845e8dd4 83e98000 1e80: e0181ee4 e0181e90 807b8180 807ae6a4 00000064 00000001 00000000 e0181eac 1ea0: 8622f250 834d77f8 00006400 0000000b e0181ea0 00000000 00000000 faed7969 1ec0: 864b4f00 40946400 200000c0 200000c0 864b4f00 00000003 e0181ef4 e0181ee8 1ee0: 807b82a0 faed7969 e0181f14 40946400 00000000 864b4f01 200000c0 864b4f00 1f00: 00000003 83e98000 e0181fa4 e0181f18 80585768 814013c8 ecac8b10 83e98000 1f20: e0181f3c e0181f30 81ab01ac 81ab007c e0181f54 e0181f40 8025bcbc 8028e0c4 1f40: e0181fb0 40000000 e0181f84 e0181f58 80221a38 8025bc78 00000000 8281d17c 1f60: e0181fb0 0014c8c0 ecac8b10 8022198c 00000000 faed7969 e0181fac 00000000 1f80: 00000000 00326310 00000036 8020029c 83e98000 00000036 00000000 e0181fa8 1fa0: 80200060 80585644 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fb90bc 1fe0: 76fb8ec0 76fb8eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81416254>] (subdev_8255_io) from [<81415f8c>] (subdev_8255_do_config+0x58/0x60 drivers/comedi/drivers/comedi_8255.c:115) r7:00000f27 r6:00000f27 r5:843a8900 r4:81416254 [<81415f34>] (subdev_8255_do_config) from [<8141634c>] (__subdev_8255_init drivers/comedi/drivers/comedi_8255.c:172 [inline]) [<81415f34>] (subdev_8255_do_config) from [<8141634c>] (subdev_8255_io_init+0x8c/0x9c drivers/comedi/drivers/comedi_8255.c:192) r4:86d7f000 [<814162c0>] (subdev_8255_io_init) from [<814164f8>] (dev_8255_attach drivers/comedi/drivers/8255.c:82 [inline]) [<814162c0>] (subdev_8255_io_init) from [<814164f8>] (dev_8255_attach+0x74/0x120 drivers/comedi/drivers/8255.c:46) r7:00000f27 r6:86d7f000 r5:00000000 r4:843a8900 [<81416484>] (dev_8255_attach) from [<8140502c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r10:82b28ad8 r9:00000000 r8:843a8900 r7:e0181d88 r6:843a8944 r5:843a8900 r4:829d46a0 [<81404f24>] (comedi_device_attach) from [<81400984>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83e98000 r7:843a8930 r6:b5403587 r5:843a8900 r4:200000c0 [<81400884>] (do_devconfig_ioctl) from [<81401978>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83e98000 r7:843a8930 r6:200000c0 r5:843a8900 r4:864b4f00 [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814013bc>] (comedi_unlocked_ioctl) from [<80585768>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83e98000 r9:00000003 r8:864b4f00 r7:200000c0 r6:864b4f01 r5:00000000 r4:40946400 [<80585638>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0181fa8 to 0xe0181ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fb90bc 1fe0: 76fb8ec0 76fb8eb0 000192bc 00132360 r10:00000036 r9:83e98000 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