8<--- cut here --- Unable to handle kernel paging request at virtual address fee08005 when write [fee08005] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5380 Comm: syz.1.420 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 : [<8140a610>] lr : [<8140a600>] psr: 60000013 sp : df9c9d28 ip : df9c9d28 fp : df9c9d4c r10: 82b28ad8 r9 : 00000003 r8 : 84480600 r7 : df9c9d88 r6 : 84480600 r5 : 00000000 r4 : 00000000 r3 : fee08005 r2 : 81e1a398 r1 : 00000001 r0 : 8140a280 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8597fa80 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 84480600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84480600 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 0xdf9c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdf9c8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.1.420 (pid: 5380, stack limit = 0xdf9c8000) Stack: (0xdf9c9d28 to 0xdf9ca000) 9d20: 824334c0 84480600 829d3f08 829d3f08 81e1a858 84480644 9d40: df9c9d84 df9c9d50 814062bc 8140a4a8 84480630 00000000 df9c9d74 20000180 9d60: 84480600 b5403587 84480630 83975400 40946400 00000003 df9c9e44 df9c9d88 9d80: 81401c14 814061c0 656d6f63 705f6964 6f707261 00007472 00000000 00008005 9da0: 00000009 00000004 00000000 00010001 00000cc7 00010001 00800001 0000000a 9dc0: 000000ff 00000c4f 00000eb4 00000008 01100006 00000006 0000000a 00000008 9de0: 00000007 00000043 00000004 0000000c 80000021 00000f27 00000006 0000800b 9e00: 00000008 00000005 00000005 00000008 00100004 0000000c 00000000 d589f9ee 9e20: 00000000 8523e000 84480600 20000180 84480630 83975400 df9c9f14 df9c9e48 9e40: 81402c08 81401b20 00000000 00000000 00000000 00000000 00000000 d589f9ee 9e60: 00000000 00000000 824a45ec 0000005f 84497be8 00000064 846e600c 83975400 9e80: df9c9ee4 df9c9e90 807b8780 807aeca4 00000064 00000001 00000000 df9c9eac 9ea0: 85cefb50 834e6f68 00006400 0000000b df9c9ea0 00000000 00000000 d589f9ee 9ec0: 8523e000 40946400 20000180 20000180 8523e000 00000003 df9c9ef4 df9c9ee8 9ee0: 807b88a0 d589f9ee df9c9f14 40946400 00000000 8523e001 20000180 8523e000 9f00: 00000003 83975400 df9c9fa4 df9c9f18 80585d10 81402658 ecac8b10 83975400 9f20: df9c9f3c df9c9f30 81ab1724 81ab15f4 df9c9f54 df9c9f40 8025bcbc 8028e0c4 9f40: df9c9fb0 40000000 df9c9f84 df9c9f58 80221a38 8025bc78 00000000 8281cf7c 9f60: df9c9fb0 0014c8c0 ecac8b10 8022198c 00000000 d589f9ee df9c9fac 00000000 9f80: 00000000 00326310 00000036 8020029c 83975400 00000036 00000000 df9c9fa8 9fa0: 80200060 80585bec 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f8a0bc 9fe0: 76f89ec0 76f89eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<8140a49c>] (parport_attach) from [<814062bc>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84480644 r5:81e1a858 r4:829d3f08 [<814061b4>] (comedi_device_attach) from [<81401c14>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83975400 r7:84480630 r6:b5403587 r5:84480600 r4:20000180 [<81401b14>] (do_devconfig_ioctl) from [<81402c08>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83975400 r7:84480630 r6:20000180 r5:84480600 r4:8523e000 [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8140264c>] (comedi_unlocked_ioctl) from [<80585d10>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83975400 r9:00000003 r8:8523e000 r7:20000180 r6:8523e001 r5:00000000 r4:40946400 [<80585be0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9c9fa8 to 0xdf9c9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000180 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76f8a0bc 9fe0: 76f89ec0 76f89eb0 000192bc 00132360 r10:00000036 r9:83975400 r8:8020029c r7:00000036 r6:00326310 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