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: 1 UID: 0 PID: 14884 Comm: syz.7.2277 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 : dffc1d30 ip : dffc1d30 fp : dffc1d54 r10: 82b25910 r9 : 00000003 r8 : 84139780 r7 : dffc1d90 r6 : 84139780 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 838231c0 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 84139780 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdffc0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84139780 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 0xdffc0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdffc0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.7.2277 (pid: 14884, stack limit = 0xdffc0000) Stack: (0xdffc1d30 to 0xdffc2000) 1d20: 823f12fc 84139780 829d1bf4 829d1bf4 1d40: 81e17c9c 841397c4 dffc1d8c dffc1d58 813ca528 813ce330 20000180 00000000 1d60: dffc1d7c 20000180 84139780 b5403587 20000180 83920c00 40946400 00000003 1d80: dffc1e4c dffc1d90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00008001 00000007 00000004 00000000 00010001 00000cc7 00010001 1dc0: 00800004 0000000a 000000ff 00000c4f 00000001 00000008 01100004 00000006 1de0: 0000000a 00000008 00000007 00000043 40000003 0000000c 00000002 00000f27 1e00: 00000006 0000800b 00000008 00000005 00000005 00000008 00000004 0000000c 1e20: 00000000 da12595a 00000000 85e70900 84139780 20000180 20000180 83920c00 1e40: dffc1f14 dffc1e50 813c7040 813c5f80 00000000 00000000 00000000 da12595a 1e60: 00000000 00000000 824625b4 0000005f 83ef57f8 841397b0 8411beac 83920c00 1e80: dffc1ee4 dffc1e90 807a7564 8079d95c 00000064 00000001 00000000 dffc1eac 1ea0: 84e3b010 834e8770 00006400 0000000b dffc1ea0 00000000 00000000 da12595a 1ec0: 85e70900 40946400 20000180 20000180 85e70900 00000003 dffc1ef4 dffc1ee8 1ee0: 807a7684 da12595a dffc1f14 40946400 00000000 85e70901 20000180 85e70900 1f00: 00000003 83920c00 dffc1fa4 dffc1f18 80578798 813c6a70 ecac8b10 83920c00 1f20: dffc1f3c dffc1f30 81a606d8 81a605a8 dffc1f54 dffc1f40 8025c484 8028d914 1f40: dffc1fb0 40000000 dffc1f84 dffc1f58 802229ec 8025c440 00000000 8281cfb4 1f60: dffc1fb0 0014ca70 ecac8b10 80222940 00000000 da12595a dffc1fac 00000000 1f80: 00000000 00316308 00000036 8020029c 83920c00 00000036 00000000 dffc1fa8 1fa0: 80200060 80578674 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fac0bc 1fe0: 76fabec0 76fabeb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841397c4 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 r8:83920c00 r7:20000180 r6:b5403587 r5:84139780 r4:20000180 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83920c00 r7:20000180 r6:20000180 r5:84139780 r4:85e70900 [<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) r10:83920c00 r9:00000003 r8:85e70900 r7:20000180 r6:85e70901 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdffc1fa8 to 0xdffc1ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fac0bc 1fe0: 76fabec0 76fabeb0 000195a4 00132510 r10:00000036 r9:83920c00 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