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: 8592 Comm: syz.4.1007 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 : [<813ce690>] lr : [<813ce680>] psr: 60000013 sp : dfc39d30 ip : dfc39d30 fp : dfc39d54 r10: 82b25910 r9 : 00000003 r8 : 84108780 r7 : dfc39d90 r6 : 84108780 r5 : 00000000 r4 : 00000000 r3 : fee08001 r2 : 81e177dc r1 : 00000001 r0 : 813ce300 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85d32c40 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 84108780 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfc38000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 84108780 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 0xdfc38000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfc38000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.4.1007 (pid: 8592, stack limit = 0xdfc38000) Stack: (0xdfc39d30 to 0xdfc3a000) 9d20: dfc39d4c dfc39d40 829d1bf4 829d1bf4 9d40: 81e17c9c 841087c4 dfc39d8c dfc39d58 813ca720 813ce528 200000c0 00000000 9d60: dfc39d7c 200000c0 84108780 b5403587 200000c0 8578ec00 40946400 00000003 9d80: dfc39e4c dfc39d90 813c626c 813ca624 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 e6e91eb4 00000000 88757b40 84108780 200000c0 200000c0 8578ec00 9e40: dfc39f14 dfc39e50 813c7238 813c6178 00000000 00000000 00000000 e6e91eb4 9e60: 00000000 00000000 824625b4 0000005f 83bd99f0 841087b0 83f47d8c 8578ec00 9e80: dfc39ee4 dfc39e90 807a7684 8079da7c 00000064 00000001 00000000 dfc39eac 9ea0: 859bb0d0 834ed550 00006400 0000000b dfc39ea0 00000000 00000000 e6e91eb4 9ec0: 88757b40 40946400 200000c0 200000c0 88757b40 00000007 dfc39ef4 dfc39ee8 9ee0: 807a77a4 e6e91eb4 dfc39f14 40946400 00000000 88757b41 200000c0 88757b40 9f00: 00000007 8578ec00 dfc39fa4 dfc39f18 805788b8 813c6c68 ecac8b10 8578ec00 9f20: dfc39f3c dfc39f30 81a60ab8 81a60988 dfc39f54 dfc39f40 8025c484 8028d914 9f40: dfc39fb0 40000000 dfc39f84 dfc39f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfc39fb0 0014ca70 ecac8b10 80222940 00000000 e6e91eb4 dfc39fac 00000000 9f80: 00000000 003163a8 00000036 8020029c 8578ec00 00000036 00000000 dfc39fa8 9fa0: 80200060 80578794 00000000 00000000 00000007 40946400 200000c0 00000000 9fc0: 00000000 00000000 003163a8 00000036 00300000 00000000 00006364 76f7f0bc 9fe0: 76f7eec0 76f7eeb0 000195a4 00132510 60000010 00000007 00000000 00000000 Call trace: [<813ce51c>] (parport_attach) from [<813ca720>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:841087c4 r5:81e17c9c r4:829d1bf4 [<813ca618>] (comedi_device_attach) from [<813c626c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8578ec00 r7:200000c0 r6:b5403587 r5:84108780 r4:200000c0 [<813c616c>] (do_devconfig_ioctl) from [<813c7238>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8578ec00 r7:200000c0 r6:200000c0 r5:84108780 r4:88757b40 [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6c5c>] (comedi_unlocked_ioctl) from [<805788b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8578ec00 r9:00000007 r8:88757b40 r7:200000c0 r6:88757b41 r5:00000000 r4:40946400 [<80578788>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfc39fa8 to 0xdfc39ff0) 9fa0: 00000000 00000000 00000007 40946400 200000c0 00000000 9fc0: 00000000 00000000 003163a8 00000036 00300000 00000000 00006364 76f7f0bc 9fe0: 76f7eec0 76f7eeb0 000195a4 00132510 r10:00000036 r9:8578ec00 r8:8020029c r7:00000036 r6:003163a8 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