8<--- cut here --- Unable to handle kernel paging request at virtual address fee00033 when write [fee00033] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 28068 Comm: syz.0.5452 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 : [<81401274>] lr : [<81401264>] psr: 60000113 sp : ea4d1d30 ip : ea4d1d30 fp : ea4d1d54 r10: 82b29b30 r9 : 00000003 r8 : 84699180 r7 : ea4d1d90 r6 : 84699180 r5 : 00000000 r4 : 00000000 r3 : fee00033 r2 : 81e24f44 r1 : 00000001 r0 : 81400ee4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85339440 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 84699180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea4d0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84699180 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 0xea4d0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea4d0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.0.5452 (pid: 28068, stack limit = 0xea4d0000) Stack: (0xea4d1d30 to 0xea4d2000) 1d20: 8243d12c 84699180 829d4280 829d4280 1d40: 81e25404 00000000 ea4d1d8c ea4d1d58 813fcea0 8140110c 40946400 00000000 1d60: ea4d1d7c 200000c0 84699180 b5403587 40946400 850e0c00 00000003 846991b0 1d80: ea4d1e4c ea4d1d90 813f87d8 813fcda0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000033 00000003 00000000 00000010 00000004 00000cc7 000000df 1dc0: 00000007 00000009 000003ff 08000800 0000bc20 00000001 00000006 0000f069 1de0: 00000000 00000009 00200000 fffffff4 00000002 00000000 fffffffd fffffffd 1e00: fffffff5 ffffeadb 00000003 000007ff 8000000b 00000000 08000000 00000004 1e20: 00000000 f17ebb42 00000000 84e9e240 84699180 200000c0 40946400 850e0c00 1e40: ea4d1f14 ea4d1e50 813f9358 813f8710 ea4d1e4c f17ebb42 00000000 00000000 1e60: 824b15ec ea4d1ea4 0000005f 84014250 00000064 8453add4 ea4d1ee4 ea4d1e88 1e80: 807b3fb4 807aa630 00000064 00000001 00000000 ea4d1ea4 84e1c3d0 834304c8 1ea0: 00006400 0000000b ea4d1e98 00000000 ea4d1d38 f17ebb42 00000000 84e9e240 1ec0: 40946400 200000c0 200000c0 84e9e240 00000003 850e0c00 ea4d1ef4 ea4d1ee8 1ee0: 807b40e4 f17ebb42 ea4d1f14 00000000 84e9e241 40946400 200000c0 84e9e240 1f00: 00000003 850e0c00 ea4d1fa4 ea4d1f18 805821a4 813f9260 ecac8b10 850e0c00 1f20: ea4d1f3c ea4d1f30 81aa6d38 81aa6c08 ea4d1f54 ea4d1f40 8025ba7c 8028ef68 1f40: ea4d1fb0 40000000 ea4d1f84 ea4d1f58 80221a54 8025ba38 00000000 8281cf7c 1f60: ea4d1fb0 0013ddc0 ecac8b10 802219a8 00000000 f17ebb42 ea4d1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 850e0c00 00000036 00000000 ea4d1fa8 1fa0: 80200060 80581f6c 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f050dc 1fe0: 76f04e88 76f04e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401100>] (parport_attach) from [<813fcea0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d4280 [<813fcd94>] (comedi_device_attach) from [<813f87d8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:846991b0 r9:00000003 r8:850e0c00 r7:40946400 r6:b5403587 r5:84699180 r4:200000c0 [<813f8704>] (do_devconfig_ioctl) from [<813f9358>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:850e0c00 r7:40946400 r6:200000c0 r5:84699180 r4:84e9e240 [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:850e0c00 r9:00000003 r8:84e9e240 r7:200000c0 r6:40946400 r5:84e9e241 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea4d1fa8 to 0xea4d1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f050dc 1fe0: 76f04e88 76f04e78 00018734 0012fc20 r10:00000036 r9:850e0c00 r8:8020029c r7:00000036 r6:00346310 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