8<--- cut here --- Unable to handle kernel paging request at virtual address fee08001 when write [fee08001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 20137 Comm: syz.3.18021 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 : [<813acc30>] lr : [<813acc20>] psr: 60000013 sp : dfa89d30 ip : dfa89d30 fp : dfa89d54 r10: 82b16f40 r9 : 00000003 r8 : 840bb900 r7 : dfa89d90 r6 : 840bb900 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e15684 r1 : 00000001 r0 : 813ac8a0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85ad9340 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 840bb900 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa88000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840bb900 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 0xdfa88000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa88000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.3.18021 (pid: 20137, stack limit = 0xdfa88000) Stack: (0xdfa89d30 to 0xdfa8a000) 9d20: dfa89d4c dfa89d40 829cf9ac 829cf9ac 9d40: 81e15b44 840bb944 dfa89d8c dfa89d58 813a8ccc 813acac8 200000c0 00000000 9d60: dfa89d7c 200000c0 840bb900 b5403587 200000c0 8320ec00 40946400 00000003 9d80: dfa89e4c dfa89d90 813a4818 813a8bd0 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00008001 00000000 00000001 00000000 00000000 00000cc7 00000008 9dc0: 00000007 0000000a 00000100 00001002 00000001 00000008 00000004 00000006 9de0: ffffffff 00000001 0001a449 00000001 40000003 00000089 00000002 00000f27 9e00: 00000006 00000007 00000008 7fffffff 00000008 00000004 00010001 fffffff8 9e20: 00000000 191b44d9 00000000 86f9af00 840bb900 200000c0 200000c0 8320ec00 9e40: dfa89f14 dfa89e50 813a57e4 813a4724 00000000 00000000 00000000 191b44d9 9e60: 00000000 00000000 8247154c 0000005f 83ca2e58 840bb930 8424e3fc 8320ec00 9e80: dfa89ee4 dfa89e90 80797f84 8078e2e8 00000064 00000001 00000000 dfa89eac 9ea0: 848d2250 834eecc0 00006400 0000000b dfa89ea0 00000000 00000000 191b44d9 9ec0: 86f9af00 40946400 200000c0 200000c0 86f9af00 00000003 dfa89ef4 dfa89ee8 9ee0: 807980a4 191b44d9 dfa89f14 40946400 00000000 86f9af01 200000c0 86f9af00 9f00: 00000003 8320ec00 dfa89fa4 dfa89f18 8056d184 813a5214 ecac8b10 8320ec00 9f20: dfa89f3c dfa89f30 81a3b678 81a3b548 dfa89f54 dfa89f40 8025e490 8028f00c 9f40: dfa89fb0 40000000 dfa89f84 dfa89f58 802229ec 8025e44c 00000000 8281cddc 9f60: dfa89fb0 0014ca70 ecac8b10 80222940 00000000 191b44d9 dfa89fac 00000000 9f80: 00000000 00316308 00000036 8020029c 8320ec00 00000036 00000000 dfa89fa8 9fa0: 80200060 8056d060 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fad0bc 9fe0: 76facec0 76faceb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813acabc>] (parport_attach) from [<813a8ccc>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840bb944 r5:81e15b44 r4:829cf9ac [<813a8bc4>] (comedi_device_attach) from [<813a4818>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8320ec00 r7:200000c0 r6:b5403587 r5:840bb900 r4:200000c0 [<813a4718>] (do_devconfig_ioctl) from [<813a57e4>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8320ec00 r7:200000c0 r6:200000c0 r5:840bb900 r4:86f9af00 [<813a5208>] (comedi_unlocked_ioctl) from [<8056d184>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a5208>] (comedi_unlocked_ioctl) from [<8056d184>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a5208>] (comedi_unlocked_ioctl) from [<8056d184>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a5208>] (comedi_unlocked_ioctl) from [<8056d184>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:8320ec00 r9:00000003 r8:86f9af00 r7:200000c0 r6:86f9af01 r5:00000000 r4:40946400 [<8056d054>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa89fa8 to 0xdfa89ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fad0bc 9fe0: 76facec0 76faceb0 000195a4 00132510 r10:00000036 r9:8320ec00 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