8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4112 Comm: syz.1.105 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 : [<813ce498>] lr : [<813ce488>] psr: 60000013 sp : ea2a9d30 ip : ea2a9d30 fp : ea2a9d54 r10: 82b25910 r9 : 00000003 r8 : 84072240 r7 : ea2a9d90 r6 : 84072240 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85e2cb40 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 84072240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea2a8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84072240 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 0xea2a8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xea2a8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.105 (pid: 4112, stack limit = 0xea2a8000) Stack: (0xea2a9d30 to 0xea2aa000) 9d20: 823f12fc 84072240 829d1bf4 829d1bf4 9d40: 81e17c9c 84072284 ea2a9d8c ea2a9d58 813ca528 813ce330 200000c0 00000000 9d60: ea2a9d7c 200000c0 84072240 b5403587 200000c0 8381d400 40946400 00000003 9d80: ea2a9e4c ea2a9d90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00005d93 00000008 00000006 00000005 00000005 00000009 9dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000006 00000005 00000006 9de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000008 9e00: 20001e5b 00000000 00000e66 00000004 00000008 00000005 00000000 fffffff8 9e20: 00000000 ff5d1edb 00000000 847d0540 84072240 200000c0 200000c0 8381d400 9e40: ea2a9f14 ea2a9e50 813c7040 813c5f80 00000000 00000000 00000000 ff5d1edb 9e60: 00000000 00000000 824625b4 0000005f 83c957f8 84072270 83d63f84 8381d400 9e80: ea2a9ee4 ea2a9e90 807a7564 8079d95c 00000064 00000001 00000000 ea2a9eac 9ea0: 85b5b850 834e0e58 00006400 0000000b ea2a9ea0 00000000 00000000 ff5d1edb 9ec0: 847d0540 40946400 200000c0 200000c0 847d0540 00000003 ea2a9ef4 ea2a9ee8 9ee0: 807a7684 ff5d1edb ea2a9f14 40946400 00000000 847d0541 200000c0 847d0540 9f00: 00000003 8381d400 ea2a9fa4 ea2a9f18 80578798 813c6a70 ecac8b10 8381d400 9f20: ea2a9f3c ea2a9f30 81a606d8 81a605a8 ea2a9f54 ea2a9f40 8025c484 8028d914 9f40: ea2a9fb0 40000000 ea2a9f84 ea2a9f58 802229ec 8025c440 00000000 8281cfb4 9f60: ea2a9fb0 0014ca70 ecac8b10 80222940 00000000 ff5d1edb ea2a9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 8381d400 00000036 00000000 ea2a9fa8 9fa0: 80200060 80578674 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff80bc 9fe0: 76ff7ec0 76ff7eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84072284 r5:81e17c9c r4:829d1bf4 [<813ca420>] (comedi_device_attach) from [<813c6074>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8381d400 r7:200000c0 r6:b5403587 r5:84072240 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8381d400 r7:200000c0 r6:200000c0 r5:84072240 r4:847d0540 [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8381d400 r9:00000003 r8:847d0540 r7:200000c0 r6:847d0541 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea2a9fa8 to 0xea2a9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76ff80bc 9fe0: 76ff7ec0 76ff7eb0 000195a4 00132510 r10:00000036 r9:8381d400 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