8<--- cut here --- Unable to handle kernel paging request at virtual address fee00008 when write [fee00008] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 22943 Comm: syz.7.4238 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 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 : [<814092a8>] lr : [<81409298>] psr: 60000013 sp : ea845d28 ip : ea845d28 fp : ea845d4c r10: 82b28ad8 r9 : 00000003 r8 : 843d19c0 r7 : ea845d88 r6 : 843d19c0 r5 : 00000000 r4 : 00000000 r3 : fee00008 r2 : 81e1a318 r1 : 00000001 r0 : 81408f18 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fe8540 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 843d19c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 843d19c0 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 0xea844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea844000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.7.4238 (pid: 22943, stack limit = 0xea844000) Stack: (0xea845d28 to 0xea846000) 5d20: 82433190 843d19c0 829d3f08 829d3f08 81e1a7d8 843d1a04 5d40: ea845d84 ea845d50 81404f54 81409140 843d19f0 00000000 ea845d74 200000c0 5d60: 843d19c0 b5403587 843d19f0 84546000 40946400 00000003 ea845e44 ea845d88 5d80: 814008ac 81404e58 656d6f63 705f6964 6f707261 00007472 00000000 00000008 5da0: 00000005 00000002 04000401 00000001 40000cca 00000fff 5c952399 00000005 5dc0: 0000002b 00000802 00001600 00010001 00000001 00000009 0000e1cb 00000006 5de0: 00000004 00000003 00000395 8000008b fffffffd 00000032 fffffff5 feffeadb 5e00: 00000007 0000003c 10000008 00000002 08000000 00002ec0 00000000 eecf13a8 5e20: 00000000 855a0600 843d19c0 200000c0 843d19f0 84546000 ea845f14 ea845e48 5e40: 814018a0 814007b8 00000000 00000000 00000000 ea845e54 ea845e54 eecf13a8 5e60: 00000000 00000000 824a45ec 0000005f 840d1018 00000064 845a336c 84546000 5e80: ea845ee4 ea845e90 807b8180 807ae6a4 00000064 00000001 00000000 ea845eac 5ea0: 85d763d0 8342a440 00006400 0000000b ea845ea0 00000000 ea845d40 eecf13a8 5ec0: 855a0600 40946400 200000c0 200000c0 855a0600 00000003 ea845ef4 ea845ee8 5ee0: 807b82a0 eecf13a8 ea845f14 40946400 00000000 855a0601 200000c0 855a0600 5f00: 00000003 84546000 ea845fa4 ea845f18 80585768 814012f0 ecac8b10 84546000 5f20: ea845f3c ea845f30 81ab004c 81aaff1c ea845f54 ea845f40 8025bcbc 8028e0c4 5f40: ea845fb0 40000000 ea845f84 ea845f58 80221a38 8025bc78 00000000 8281d17c 5f60: ea845fb0 0014c8c0 ecac8b10 8022198c 00000000 eecf13a8 ea845fac 00000000 5f80: 00000000 00326310 00000036 8020029c 84546000 00000036 00000000 ea845fa8 5fa0: 80200060 80585644 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fc70bc 5fe0: 76fc6ec0 76fc6eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81409134>] (parport_attach) from [<81404f54>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:843d1a04 r5:81e1a7d8 r4:829d3f08 [<81404e4c>] (comedi_device_attach) from [<814008ac>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:84546000 r7:843d19f0 r6:b5403587 r5:843d19c0 r4:200000c0 [<814007ac>] (do_devconfig_ioctl) from [<814018a0>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:84546000 r7:843d19f0 r6:200000c0 r5:843d19c0 r4:855a0600 [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814012e4>] (comedi_unlocked_ioctl) from [<80585768>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:84546000 r9:00000003 r8:855a0600 r7:200000c0 r6:855a0601 r5:00000000 r4:40946400 [<80585638>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea845fa8 to 0xea845ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fc70bc 5fe0: 76fc6ec0 76fc6eb0 000192bc 00132360 r10:00000036 r9:84546000 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