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: 12730 Comm: syz.7.1793 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 : [<813ac798>] lr : [<813ac788>] psr: 60000013 sp : dfbd1d30 ip : dfbd1d30 fp : dfbd1d54 r10: 82b16f40 r9 : 00000003 r8 : 84164a80 r7 : dfbd1d90 r6 : 84164a80 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15644 r1 : 00000001 r0 : 813ac408 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8490c040 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 84164a80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84164a80 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 0xdfbd0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfbd0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.7.1793 (pid: 12730, stack limit = 0xdfbd0000) Stack: (0xdfbd1d30 to 0xdfbd2000) 1d20: 823fef98 84164a80 829cf9ec 829cf9ec 1d40: 81e15b04 84164ac4 dfbd1d8c dfbd1d58 813a8830 813ac630 200000c0 00000000 1d60: dfbd1d7c 200000c0 84164a80 b5403587 200000c0 859c4800 40946400 00000003 1d80: dfbd1e4c dfbd1d90 813a437c 813a8734 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000005 00000004 00000002 00000002 00000005 00000004 1dc0: 00000007 54c6cff3 000000fd 00000002 00000009 00000001 00000001 00000006 1de0: 00000101 00000000 0000007f 00000003 40000003 00000089 0000caa1 00000000 1e00: 20001e5b 00000000 00000e66 00000003 00000008 00004086 00000000 fffffff8 1e20: 00000000 31caa98d 00000000 8637c900 84164a80 200000c0 200000c0 859c4800 1e40: dfbd1f14 dfbd1e50 813a5348 813a4288 00000000 00000000 00000000 31caa98d 1e60: 00000000 00000000 8247154c 0000005f 83c26858 84164ab0 8425100c 859c4800 1e80: dfbd1ee4 dfbd1e90 80797c9c 8078e000 00000064 00000001 00000000 dfbd1eac 1ea0: 85fb6850 834de660 00006400 0000000b dfbd1ea0 00000000 dfbd1fa4 dfbd1ec8 1ec0: 80200bec 81a098cc 8637c900 40946400 200000c0 813a4d6c 40946400 00000000 1ee0: 8637c901 31caa98d 8637c900 40946400 00000000 8637c901 200000c0 8637c900 1f00: 00000003 859c4800 dfbd1fa4 dfbd1f18 8056ce9c 813a4d78 ecac8b10 859c4800 1f20: dfbd1f3c dfbd1f30 81a3b038 81a3af08 dfbd1f54 dfbd1f40 8025e490 8028ef6c 1f40: dfbd1fb0 40000000 dfbd1f84 dfbd1f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfbd1fb0 0014c800 ecac8b10 80222940 00000000 31caa98d dfbd1fac 00000000 1f80: 00000000 00306308 00000036 8020029c 859c4800 00000036 00000000 dfbd1fa8 1fa0: 80200060 8056cd78 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f780bc 1fe0: 76f77ec0 76f77eb0 0001948c 001322a0 60000010 00000003 00000000 00000000 Call trace: [<813ac624>] (parport_attach) from [<813a8830>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84164ac4 r5:81e15b04 r4:829cf9ec [<813a8728>] (comedi_device_attach) from [<813a437c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:859c4800 r7:200000c0 r6:b5403587 r5:84164a80 r4:200000c0 [<813a427c>] (do_devconfig_ioctl) from [<813a5348>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:859c4800 r7:200000c0 r6:200000c0 r5:84164a80 r4:8637c900 [<813a4d6c>] (comedi_unlocked_ioctl) from [<8056ce9c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4d6c>] (comedi_unlocked_ioctl) from [<8056ce9c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4d6c>] (comedi_unlocked_ioctl) from [<8056ce9c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4d6c>] (comedi_unlocked_ioctl) from [<8056ce9c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:859c4800 r9:00000003 r8:8637c900 r7:200000c0 r6:8637c901 r5:00000000 r4:40946400 [<8056cd6c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfbd1fa8 to 0xdfbd1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00306308 00000036 002f0000 00000000 00006364 76f780bc 1fe0: 76f77ec0 76f77eb0 0001948c 001322a0 r10:00000036 r9:859c4800 r8:8020029c r7:00000036 r6:00306308 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