8<--- cut here --- Unable to handle kernel paging request at virtual address fee00002 when write [fee00002] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 13873 Comm: syz.3.2134 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 parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] PC is at parport_attach+0x174/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:289 [inline] LR is at parport_attach+0x164/0x1d0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<813acac8>] lr : [<813acab8>] psr: 60000013 sp : dfb09d30 ip : dfb09d30 fp : dfb09d54 r10: 82b16f40 r9 : 00000003 r8 : 841cf300 r7 : dfb09d90 r6 : 841cf300 r5 : 00000000 r4 : 00000000 r3 : fee00002 r2 : 81e15684 r1 : 00000001 r0 : 813ac738 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85d2c380 DAC: 00000000 Register r0 information: non-slab/vmalloc memory Register r1 information: non-paged memory Register r2 information: non-slab/vmalloc memory Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1055 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 841cf300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841cf300 pointer offset 0 size 192 Register r9 information: non-paged memory Register r10 information: non-slab/vmalloc memory Register r11 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfb08000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.3.2134 (pid: 13873, stack limit = 0xdfb08000) Stack: (0xdfb09d30 to 0xdfb0a000) 9d20: 823ff16c 841cf300 829cf9ac 829cf9ac 9d40: 81e15b44 841cf344 dfb09d8c dfb09d58 813a8b64 813ac960 200000c0 00000000 9d60: dfb09d7c 200000c0 841cf300 b5403587 200000c0 84ad0000 40946400 00000003 9d80: dfb09e4c dfb09d90 813a46b0 813a8a68 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000002 08000006 00000001 00000008 00040001 00000ccf 7fffffff 9dc0: 5c952399 03000000 00000000 ffffffff 00000300 00000001 00000b01 00000009 9de0: 00000000 00000000 00000008 00000000 000001ff 80000089 00000008 00000b48 9e00: 00008000 ffffead8 16d68259 0000003e 00000000 00000c93 000007ff dffffffa 9e20: 00000000 4ca56673 00000000 859ded80 841cf300 200000c0 200000c0 84ad0000 9e40: dfb09f14 dfb09e50 813a567c 813a45bc 00000000 00000000 00000000 4ca56673 9e60: 00000000 00000000 8247154c 0000005f 83d01a58 841cf330 841e5c6c 84ad0000 9e80: dfb09ee4 dfb09e90 80797ecc 8078e230 00000064 00000001 00000000 dfb09eac 9ea0: 85cc4c10 8341d6e8 00006400 0000000b dfb09ea0 00000000 00000000 4ca56673 9ec0: 859ded80 40946400 200000c0 200000c0 859ded80 00000003 dfb09ef4 dfb09ee8 9ee0: 80797fec 4ca56673 dfb09f14 40946400 00000000 859ded81 200000c0 859ded80 9f00: 00000003 84ad0000 dfb09fa4 dfb09f18 8056d0cc 813a50ac ecac8b10 84ad0000 9f20: dfb09f3c dfb09f30 81a3b4b8 81a3b388 dfb09f54 dfb09f40 8025e490 8028ef6c 9f40: dfb09fb0 40000000 dfb09f84 dfb09f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfb09fb0 0014ca70 ecac8b10 80222940 00000000 4ca56673 dfb09fac 00000000 9f80: 00000000 00316308 00000036 8020029c 84ad0000 00000036 00000000 dfb09fa8 9fa0: 80200060 8056cfa8 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f440bc 9fe0: 76f43ec0 76f43eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ac954>] (parport_attach) from [<813a8b64>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841cf344 r5:81e15b44 r4:829cf9ac [<813a8a5c>] (comedi_device_attach) from [<813a46b0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:84ad0000 r7:200000c0 r6:b5403587 r5:841cf300 r4:200000c0 [<813a45b0>] (do_devconfig_ioctl) from [<813a567c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:84ad0000 r7:200000c0 r6:200000c0 r5:841cf300 r4:859ded80 [<813a50a0>] (comedi_unlocked_ioctl) from [<8056d0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a50a0>] (comedi_unlocked_ioctl) from [<8056d0cc>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a50a0>] (comedi_unlocked_ioctl) from [<8056d0cc>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a50a0>] (comedi_unlocked_ioctl) from [<8056d0cc>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:84ad0000 r9:00000003 r8:859ded80 r7:200000c0 r6:859ded81 r5:00000000 r4:40946400 [<8056cf9c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb09fa8 to 0xdfb09ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f440bc 9fe0: 76f43ec0 76f43eb0 000195a4 00132510 r10:00000036 r9:84ad0000 r8:8020029c r7:00000036 r6:00316308 r5:00000000 r4:00000000 Code: e596306c e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e596306c ldr r3, [r6, #108] @ 0x6c 4: e3a04000 mov r4, #0 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction