8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 16038 Comm: syz.1.3664 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814952f8>] lr : [<814952ec>] psr: 60000013 sp : e03a5d30 ip : e03a5d30 fp : e03a5d54 r10: 82d30eac r9 : 00000003 r8 : 841510c0 r7 : e03a5d90 r6 : e03a5d90 r5 : 841510c0 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85807780 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: slab kmalloc-192 start 841510c0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xe03a4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xe03a4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 841510c0 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 0xe03a4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xe03a4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.1.3664 (pid: 16038, stack limit = 0xe03a4000) Stack: (0xe03a5d30 to 0xe03a6000) 5d20: ffffffff 00000004 82bd8ea0 81e2e448 5d40: 00000000 e03a5d90 e03a5d8c e03a5d58 81490f84 814952a8 40946400 00000000 5d60: e03a5d7c 200003c0 841510c0 b5403587 40946400 00000002 00000003 86510c40 5d80: e03a5e4c e03a5d90 8148c788 81490e88 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000140 00000000 0001000c 0000dddc 00000000 00010000 00007fff 5dc0: 00000006 00000007 00000004 02000004 0000000f 0000c000 00000008 000004d0 5de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 5e00: 00000009 00000ffd 00000009 000000af 00000002 00000281 00008001 00000009 5e20: 00000000 a49ce7f8 00000000 8386b800 841510c0 200003c0 40946400 00000002 5e40: e03a5f14 e03a5e50 8148dab0 8148c6c8 00000000 a49ce7f8 00000000 00000000 5e60: 8254a844 e03a5ea4 0000005f 840db0f0 00000064 841510f0 e03a5ee4 e03a5e88 5e80: 80806804 807fcebc 00000064 00000001 00000000 e03a5ea4 84dc3710 83423990 5ea0: 00006400 0000000b e03a5e98 00000000 00000000 a49ce7f8 00000000 8386b800 5ec0: 40946400 200003c0 200003c0 8386b800 00000003 86510c40 e03a5ef4 e03a5ee8 5ee0: 80806938 a49ce7f8 e03a5f14 00000000 8386b801 40946400 200003c0 8386b800 5f00: 00000003 86510c40 e03a5fa4 e03a5f18 805bb114 8148d768 ecac8b10 86510c40 5f20: e03a5f3c e03a5f30 81b5c6a0 81b5c56c e03a5f54 e03a5f40 8025a7a8 8028e490 5f40: e03a5fb0 40000000 e03a5f84 e03a5f58 80220bdc 8025a764 00000000 82a1eb0c 5f60: e03a5fb0 0013eb80 ecac8b10 80220b30 00000000 a49ce7f8 e03a5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 86510c40 00000036 00000000 e03a5fa8 5fa0: 80200060 805baedc 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f620dc 5fe0: 76f61e88 76f61e78 00018f80 001309e0 60000010 00000003 00000000 00000000 Call trace: [<8149529c>] (parport_attach) from [<81490f84>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:e03a5d90 r6:00000000 r5:81e2e448 r4:82bd8ea0 [<81490e7c>] (comedi_device_attach) from [<8148c788>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:86510c40 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:841510c0 r4:200003c0 [<8148c6bc>] (do_devconfig_ioctl) from [<8148dab0>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:841510c0 r4:8386b800 [<8148d75c>] (comedi_unlocked_ioctl) from [<805bb114>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d75c>] (comedi_unlocked_ioctl) from [<805bb114>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d75c>] (comedi_unlocked_ioctl) from [<805bb114>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d75c>] (comedi_unlocked_ioctl) from [<805bb114>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:86510c40 r9:00000003 r8:8386b800 r7:200003c0 r6:40946400 r5:8386b801 r4:00000000 [<805baed0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03a5fa8 to 0xe03a5ff0) 5fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f620dc 5fe0: 76f61e88 76f61e78 00018f80 001309e0 r10:00000036 r9:86510c40 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67e4a e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67e4a bl 0xfed9f930 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction