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: 5917 Comm: syz.2.528 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<814913cc>] lr : [<814913bc>] psr: 60000013 sp : e0175d30 ip : e0175d30 fp : e0175d54 r10: 82d30dfc r9 : 00000003 r8 : 846d20c0 r7 : e0175d90 r6 : 846d20c0 r5 : 00000000 r4 : 00000000 r3 : fee00140 r2 : 81e2dc88 r1 : 00000001 r0 : 8149102c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85ed3c40 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 846d20c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0174000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r8 information: slab kmalloc-192 start 846d20c0 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 0xe0174000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Register r12 information: 2-page vmalloc region starting at 0xe0174000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2747 Process syz.2.528 (pid: 5917, stack limit = 0xe0174000) Stack: (0xe0175d30 to 0xe0176000) 5d20: 824d4034 846d20c0 82bd8e44 82bd8e44 5d40: 81e2e148 00000000 e0175d8c e0175d58 8148cf44 81491254 40946400 00000000 5d60: e0175d7c 200003c0 846d20c0 b5403587 40946400 00000002 00000003 848b6200 5d80: e0175e4c e0175d90 81488748 8148ce48 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000140 fffffffc 0001000c 0000dddc 00000000 00010000 00007fff 5dc0: 00000006 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 5de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 5e00: 00000009 00000ffd 00000009 000000af 00000002 00000283 00008001 0000e43f 5e20: 00000000 5593a3d6 00000000 8578ea80 846d20c0 200003c0 40946400 00000002 5e40: e0175f14 e0175e50 81489a70 81488688 00000000 5593a3d6 00000000 00000000 5e60: 8254880c e0175ea4 0000005f 8496c230 00000064 846d20f0 e0175ee4 e0175e88 5e80: 80804fa4 807fb2d4 00000064 00000001 00000000 e0175ea4 8633bc10 83439110 5ea0: 00006400 0000000b e0175e98 00000000 00000000 5593a3d6 00000000 8578ea80 5ec0: 40946400 200003c0 200003c0 8578ea80 00000003 848b6200 e0175ef4 e0175ee8 5ee0: 808050d8 5593a3d6 e0175f14 00000000 8578ea81 40946400 200003c0 8578ea80 5f00: 00000003 848b6200 e0175fa4 e0175f18 805ba7a0 81489728 ecac8b10 848b6200 5f20: e0175f3c e0175f30 81b55580 81b5544c e0175f54 e0175f40 8025a7ac 8028e488 5f40: e0175fb0 40000000 e0175f84 e0175f58 80220bdc 8025a768 00000000 82a1eb0c 5f60: e0175fb0 0013e9c0 ecac8b10 80220b30 00000000 5593a3d6 e0175fac 00000000 5f80: 00000000 00356310 00000036 8020029c 848b6200 00000036 00000000 e0175fa8 5fa0: 80200060 805ba568 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f7c0dc 5fe0: 76f7be88 76f7be78 00018ebc 00130820 60000010 00000003 00000000 00000000 Call trace: [<81491248>] (parport_attach) from [<8148cf44>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e148 r4:82bd8e44 [<8148ce3c>] (comedi_device_attach) from [<81488748>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:848b6200 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:846d20c0 r4:200003c0 [<8148867c>] (do_devconfig_ioctl) from [<81489a70>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:846d20c0 r4:8578ea80 [<8148971c>] (comedi_unlocked_ioctl) from [<805ba7a0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148971c>] (comedi_unlocked_ioctl) from [<805ba7a0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148971c>] (comedi_unlocked_ioctl) from [<805ba7a0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148971c>] (comedi_unlocked_ioctl) from [<805ba7a0>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:848b6200 r9:00000003 r8:8578ea80 r7:200003c0 r6:40946400 r5:8578ea81 r4:00000000 [<805ba55c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0175fa8 to 0xe0175ff0) 5fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f7c0dc 5fe0: 76f7be88 76f7be78 00018ebc 00130820 r10:00000036 r9:848b6200 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