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: 4065 Comm: syz.1.75 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<814940bc>] lr : [<814940ac>] psr: 60000013 sp : dfb19d30 ip : dfb19d30 fp : dfb19d54 r10: 82d30dfc r9 : 00000003 r8 : 8301b600 r7 : dfb19d90 r6 : 8301b600 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dee8 r1 : 00000001 r0 : 81493d1c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86014bc0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8301b600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8301b600 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 0xdfb18000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfb18000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.1.75 (pid: 4065, stack limit = 0xdfb18000) Stack: (0xdfb19d30 to 0xdfb1a000) 9d20: 824d4be8 8301b600 82bd8ea0 82bd8ea0 9d40: 81e2e3a8 00000000 dfb19d8c dfb19d58 8148fc38 81493f44 40946400 00000000 9d60: dfb19d7c 200003c0 8301b600 b5403587 40946400 00000002 00000003 8399e200 9d80: dfb19e4c dfb19d90 8148b43c 8148fb3c 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 00010000 00007fff 9dc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 9de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 9e00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f 9e20: 00000000 ff35d524 00000000 853aa980 8301b600 200003c0 40946400 00000002 9e40: dfb19f14 dfb19e50 8148c764 8148b37c 00000000 ff35d524 00000000 00000000 9e60: 8254980c dfb19ea4 0000005f 83e88058 00000064 8301b630 dfb19ee4 dfb19e88 9e80: 808061a4 807fc85c 00000064 00000001 00000000 dfb19ea4 840ae910 8342e000 9ea0: 00006400 0000000b dfb19e98 00000000 00000000 ff35d524 00000000 853aa980 9ec0: 40946400 200003c0 200003c0 853aa980 00000003 8399e200 dfb19ef4 dfb19ee8 9ee0: 808062d8 ff35d524 dfb19f14 00000000 853aa981 40946400 200003c0 853aa980 9f00: 00000003 8399e200 dfb19fa4 dfb19f18 805bae48 8148c41c ecac8b10 8399e200 9f20: dfb19f3c dfb19f30 81b59820 81b596ec dfb19f54 dfb19f40 8025a7a8 8028e490 9f40: dfb19fb0 40000000 dfb19f84 dfb19f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: dfb19fb0 0013ea70 ecac8b10 80220b30 00000000 ff35d524 dfb19fac 00000000 9f80: 00000000 00356310 00000036 8020029c 8399e200 00000036 00000000 dfb19fa8 9fa0: 80200060 805bac10 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd70dc 9fe0: 76fd6e88 76fd6e78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<81493f38>] (parport_attach) from [<8148fc38>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148fb30>] (comedi_device_attach) from [<8148b43c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:8399e200 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8301b600 r4:200003c0 [<8148b370>] (do_devconfig_ioctl) from [<8148c764>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:8301b600 r4:853aa980 [<8148c410>] (comedi_unlocked_ioctl) from [<805bae48>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c410>] (comedi_unlocked_ioctl) from [<805bae48>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c410>] (comedi_unlocked_ioctl) from [<805bae48>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c410>] (comedi_unlocked_ioctl) from [<805bae48>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:8399e200 r9:00000003 r8:853aa980 r7:200003c0 r6:40946400 r5:853aa981 r4:00000000 [<805bac04>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb19fa8 to 0xdfb19ff0) 9fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fd70dc 9fe0: 76fd6e88 76fd6e78 00018ebc 001308d0 r10:00000036 r9:8399e200 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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