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: 0 UID: 0 PID: 6818 Comm: syz.0.679 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 : [<813acdb8>] lr : [<813acda8>] psr: 60000013 sp : dfa11d30 ip : dfa11d30 fp : dfa11d54 r10: 82b16f40 r9 : 00000003 r8 : 84201180 r7 : dfa11d90 r6 : 84201180 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15684 r1 : 00000001 r0 : 813aca28 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 859d29c0 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 84201180 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84201180 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 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa10000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.679 (pid: 6818, stack limit = 0xdfa10000) Stack: (0xdfa11d30 to 0xdfa12000) 1d20: 823ff1e0 84201180 829cf9ac 829cf9ac 1d40: 81e15b44 842011c4 dfa11d8c dfa11d58 813a8e54 813acc50 200000c0 00000000 1d60: dfa11d7c 200000c0 84201180 b5403587 200000c0 85491800 40946400 00000003 1d80: dfa11e4c dfa11d90 813a49a0 813a8d58 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000005 00010000 00000004 00000005 00000cc7 00000008 1dc0: 00000007 0000000a 00000100 00000000 00000001 00000001 00000001 00000006 1de0: 00000101 00000000 0001a449 00000003 40000003 0000000a 0000caa7 00000000 1e00: 20001e5c 0000000b 00000e69 0000003c 00000008 00000006 00000000 fffffff8 1e20: 00000000 4305575c 00000000 85e61480 84201180 200000c0 200000c0 85491800 1e40: dfa11f14 dfa11e50 813a596c 813a48ac 00000000 00000000 00000000 4305575c 1e60: 00000000 00000000 8247154c 0000005f 83c22c58 842011b0 8418fb4c 85491800 1e80: dfa11ee4 dfa11e90 80797fbc 8078e320 00000064 00000001 00000000 dfa11eac 1ea0: 85a9a3d0 834ee550 00006400 0000000b dfa11ea0 00000000 00000000 4305575c 1ec0: 85e61480 40946400 200000c0 200000c0 85e61480 00000003 dfa11ef4 dfa11ee8 1ee0: 807980dc 4305575c dfa11f14 40946400 00000000 85e61481 200000c0 85e61480 1f00: 00000003 85491800 dfa11fa4 dfa11f18 8056d084 813a539c ecac8b10 85491800 1f20: dfa11f3c dfa11f30 81a3b7f8 81a3b6c8 dfa11f54 dfa11f40 8025e490 8028f00c 1f40: dfa11fb0 40000000 dfa11f84 dfa11f58 802229ec 8025e44c 00000000 8281cddc 1f60: dfa11fb0 0014ca70 ecac8b10 80222940 00000000 4305575c dfa11fac 00000000 1f80: 00000000 00316308 00000036 8020029c 85491800 00000036 00000000 dfa11fa8 1fa0: 80200060 8056cf60 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f5d0bc 1fe0: 76f5cec0 76f5ceb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813acc44>] (parport_attach) from [<813a8e54>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:842011c4 r5:81e15b44 r4:829cf9ac [<813a8d4c>] (comedi_device_attach) from [<813a49a0>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85491800 r7:200000c0 r6:b5403587 r5:84201180 r4:200000c0 [<813a48a0>] (do_devconfig_ioctl) from [<813a596c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85491800 r7:200000c0 r6:200000c0 r5:84201180 r4:85e61480 [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a5390>] (comedi_unlocked_ioctl) from [<8056d084>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85491800 r9:00000003 r8:85e61480 r7:200000c0 r6:85e61481 r5:00000000 r4:40946400 [<8056cf54>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa11fa8 to 0xdfa11ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76f5d0bc 1fe0: 76f5cec0 76f5ceb0 000195a4 00132510 r10:00000036 r9:85491800 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