8<--- cut here --- Unable to handle kernel paging request at virtual address fee05c25 when write [fee05c25] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7183 Comm: syz.1.972 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 : eabd5d30 ip : eabd5d30 fp : eabd5d54 r10: 82b25910 r9 : 00000003 r8 : 840ab780 r7 : eabd5d90 r6 : 840ab780 r5 : 00000000 r4 : 00000000 r3 : fee05c25 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85d30300 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 840ab780 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xeabd4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840ab780 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 0xeabd4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xeabd4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.1.972 (pid: 7183, stack limit = 0xeabd4000) Stack: (0xeabd5d30 to 0xeabd6000) 5d20: 823f12fc 840ab780 829d1bf4 829d1bf4 5d40: 81e17c9c 840ab7c4 eabd5d8c eabd5d58 813ca528 813ce330 200000c0 00000000 5d60: eabd5d7c 200000c0 840ab780 b5403587 200000c0 83b7bc00 40946400 00000003 5d80: eabd5e4c eabd5d90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00005c25 00000003 00000001 00000000 00000002 00000cc7 0000000c 5dc0: 00000007 0000000a 000000fe 00000002 00000001 00000006 00000403 00000006 5de0: 00000009 00000001 0001a449 00000003 40000003 00000089 00007fff 00000b27 5e00: 00000005 0000800b 00000008 00000005 00000008 00000008 00010000 fffffff7 5e20: 00000000 5036ac9d 00000000 85b84480 840ab780 200000c0 200000c0 83b7bc00 5e40: eabd5f14 eabd5e50 813c7040 813c5f80 00000000 00000000 00000000 5036ac9d 5e60: 00000000 00000000 824625b4 0000005f 83ffb7f8 840ab7b0 840d1324 83b7bc00 5e80: eabd5ee4 eabd5e90 807a7564 8079d95c 00000064 00000001 00000000 eabd5eac 5ea0: 8567d3d0 83437660 00006400 0000000b eabd5ea0 00000000 00000000 5036ac9d 5ec0: 85b84480 40946400 200000c0 200000c0 85b84480 00000003 eabd5ef4 eabd5ee8 5ee0: 807a7684 5036ac9d eabd5f14 40946400 00000000 85b84481 200000c0 85b84480 5f00: 00000003 83b7bc00 eabd5fa4 eabd5f18 80578798 813c6a70 ecac8b10 83b7bc00 5f20: eabd5f3c eabd5f30 81a606d8 81a605a8 eabd5f54 eabd5f40 8025c484 8028d914 5f40: eabd5fb0 40000000 eabd5f84 eabd5f58 802229ec 8025c440 00000000 8281cfb4 5f60: eabd5fb0 0014ca70 ecac8b10 80222940 00000000 5036ac9d eabd5fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83b7bc00 00000036 00000000 eabd5fa8 5fa0: 80200060 80578674 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f870bc 5fe0: 76f86ec0 76f86eb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840ab7c4 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 r8:83b7bc00 r7:200000c0 r6:b5403587 r5:840ab780 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83b7bc00 r7:200000c0 r6:200000c0 r5:840ab780 r4:85b84480 [<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) r10:83b7bc00 r9:00000003 r8:85b84480 r7:200000c0 r6:85b84481 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xeabd5fa8 to 0xeabd5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f870bc 5fe0: 76f86ec0 76f86eb0 000195a4 00132510 r10:00000036 r9:83b7bc00 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