8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f23 when write [fee04f23] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4955 Comm: syz.1.163 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 : [<81408a10>] lr : [<81408a00>] psr: 60000013 sp : ea5d1d28 ip : ea5d1d28 fp : ea5d1d4c r10: 82b28ad8 r9 : 00000003 r8 : 845b03c0 r7 : ea5d1d88 r6 : 845b03c0 r5 : 00000000 r4 : 00000000 r3 : fee04f23 r2 : 81e1a2b8 r1 : 00000001 r0 : 81408680 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 84fdf8c0 DAC: fffffffd 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 845b03c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea5d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 845b03c0 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 0xea5d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea5d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.163 (pid: 4955, stack limit = 0xea5d0000) Stack: (0xea5d1d28 to 0xea5d2000) 1d20: 82432cf4 845b03c0 829d3f08 829d3f08 81e1a778 845b0404 1d40: ea5d1d84 ea5d1d50 814046b8 814088a8 845b03f0 00000000 ea5d1d74 200000c0 1d60: 845b03c0 b5403587 845b03f0 83e65400 40946400 00000003 ea5d1e44 ea5d1d88 1d80: 81400010 814045bc 656d6f63 705f6964 6f707261 00007472 00000000 00004f23 1da0: 00000005 00000002 04000401 00000001 40000cc7 00000fff 5c952399 00000005 1dc0: 000003ff 00000802 00000008 00010001 00000001 00000009 0000e1cb 00000006 1de0: 00000401 00000003 00000395 80000089 fffffffd 00000032 fffffff5 ffffeadb 1e00: 00000007 0000003c 00000008 00000003 08000000 00002ec0 00000000 1b2a9a23 1e20: 00000000 84f6d600 845b03c0 200000c0 845b03f0 83e65400 ea5d1f14 ea5d1e48 1e40: 81401004 813fff1c 00000000 00000000 00000000 00000000 00000000 1b2a9a23 1e60: 00000000 00000000 824a35ec 0000005f 84097be8 00000064 845c5cfc 83e65400 1e80: ea5d1ee4 ea5d1e90 807b7dd8 807ae2fc 00000064 00000001 00000000 ea5d1eac 1ea0: 85be36d0 834f2770 00006400 0000000b ea5d1ea0 00000000 00000000 1b2a9a23 1ec0: 84f6d600 40946400 200000c0 200000c0 84f6d600 00000003 ea5d1ef4 ea5d1ee8 1ee0: 807b7ef8 1b2a9a23 ea5d1f14 40946400 00000000 84f6d601 200000c0 84f6d600 1f00: 00000003 83e65400 ea5d1fa4 ea5d1f18 80585574 81400a54 ecac8b10 83e65400 1f20: ea5d1f3c ea5d1f30 81aaf4bc 81aaf38c ea5d1f54 ea5d1f40 8025bcbc 8028e0c4 1f40: ea5d1fb0 40000000 ea5d1f84 ea5d1f58 80221a38 8025bc78 00000000 8281d17c 1f60: ea5d1fb0 0014c880 ecac8b10 8022198c 00000000 1b2a9a23 ea5d1fac 00000000 1f80: 00000000 00316310 00000036 8020029c 83e65400 00000036 00000000 ea5d1fa8 1fa0: 80200060 80585450 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fac0bc 1fe0: 76fabec0 76fabeb0 0001929c 00132320 60000010 00000003 00000000 00000000 Call trace: [<8140889c>] (parport_attach) from [<814046b8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:845b0404 r5:81e1a778 r4:829d3f08 [<814045b0>] (comedi_device_attach) from [<81400010>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83e65400 r7:845b03f0 r6:b5403587 r5:845b03c0 r4:200000c0 [<813fff10>] (do_devconfig_ioctl) from [<81401004>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83e65400 r7:845b03f0 r6:200000c0 r5:845b03c0 r4:84f6d600 [<81400a48>] (comedi_unlocked_ioctl) from [<80585574>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400a48>] (comedi_unlocked_ioctl) from [<80585574>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400a48>] (comedi_unlocked_ioctl) from [<80585574>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400a48>] (comedi_unlocked_ioctl) from [<80585574>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83e65400 r9:00000003 r8:84f6d600 r7:200000c0 r6:84f6d601 r5:00000000 r4:40946400 [<80585444>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea5d1fa8 to 0xea5d1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316310 00000036 00300000 00000000 00006364 76fac0bc 1fe0: 76fabec0 76fabeb0 0001929c 00132320 r10:00000036 r9:83e65400 r8:8020029c r7:00000036 r6:00316310 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