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: 1 UID: 0 PID: 6915 Comm: syz.2.744 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 : [<813acd78>] lr : [<813acd68>] psr: 60000013 sp : dfef1d30 ip : dfef1d30 fp : dfef1d54 r10: 82b16f40 r9 : 00000003 r8 : 84189780 r7 : dfef1d90 r6 : 84189780 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15684 r1 : 00000001 r0 : 813ac9e8 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 857b8bc0 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 84189780 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfef0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84189780 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 0xdfef0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfef0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.2.744 (pid: 6915, stack limit = 0xdfef0000) Stack: (0xdfef1d30 to 0xdfef2000) 1d20: 823ff1e0 84189780 829cf9ac 829cf9ac 1d40: 81e15b44 841897c4 dfef1d8c dfef1d58 813a8e14 813acc10 200000c0 00000000 1d60: dfef1d7c 200000c0 84189780 b5403587 200000c0 83b6ec00 40946400 00000003 1d80: dfef1e4c dfef1d90 813a4960 813a8d18 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000005 00010000 00000004 00000005 00000cc7 00000008 1dc0: 00000007 0000000a 00000100 00000000 00000001 00000001 00000001 00000006 1de0: 000000fd 00000000 0001a449 00000003 40000003 0000000a 0000caa7 00004000 1e00: 20001e5c 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 1e20: 00000000 815a72c3 00000000 847a6d80 84189780 200000c0 200000c0 83b6ec00 1e40: dfef1f14 dfef1e50 813a592c 813a486c 00000000 00000000 00000000 815a72c3 1e60: 00000000 00000000 8247154c 0000005f 84116e58 841897b0 842287a4 83b6ec00 1e80: dfef1ee4 dfef1e90 80797f94 8078e2f8 00000064 00000001 00000000 dfef1eac 1ea0: 8480c850 834e8908 00006400 0000000b dfef1ea0 00000000 00000000 815a72c3 1ec0: 847a6d80 40946400 200000c0 200000c0 847a6d80 00000003 dfef1ef4 dfef1ee8 1ee0: 807980b4 815a72c3 dfef1f14 40946400 00000000 847a6d81 200000c0 847a6d80 1f00: 00000003 83b6ec00 dfef1fa4 dfef1f18 8056d05c 813a535c ecac8b10 83b6ec00 1f20: dfef1f3c dfef1f30 81a3b7b8 81a3b688 dfef1f54 dfef1f40 8025e490 8028f00c 1f40: dfef1fb0 40000000 dfef1f84 dfef1f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfef1fb0 0014ca70 ecac8b10 80222940 00000000 815a72c3 dfef1fac 00000000 1f80: 00000000 00316308 00000036 8020029c 83b6ec00 00000036 00000000 dfef1fa8 1fa0: 80200060 8056cf38 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fe40bc 1fe0: 76fe3ec0 76fe3eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813acc04>] (parport_attach) from [<813a8e14>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841897c4 r5:81e15b44 r4:829cf9ac [<813a8d0c>] (comedi_device_attach) from [<813a4960>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83b6ec00 r7:200000c0 r6:b5403587 r5:84189780 r4:200000c0 [<813a4860>] (do_devconfig_ioctl) from [<813a592c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b6ec00 r7:200000c0 r6:200000c0 r5:84189780 r4:847a6d80 [<813a5350>] (comedi_unlocked_ioctl) from [<8056d05c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a5350>] (comedi_unlocked_ioctl) from [<8056d05c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a5350>] (comedi_unlocked_ioctl) from [<8056d05c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a5350>] (comedi_unlocked_ioctl) from [<8056d05c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83b6ec00 r9:00000003 r8:847a6d80 r7:200000c0 r6:847a6d81 r5:00000000 r4:40946400 [<8056cf2c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfef1fa8 to 0xdfef1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fe40bc 1fe0: 76fe3ec0 76fe3eb0 000195a4 00132510 r10:00000036 r9:83b6ec00 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