8<--- cut here --- Unable to handle kernel paging request at virtual address fee0007c when write [fee0007c] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5380 Comm: syz.2.333 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:88 [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 : [<8145b7ac>] lr : [<8145b79c>] psr: 60000013 sp : e01f5d30 ip : e01f5d30 fp : e01f5d54 r10: 82d29754 r9 : 00000003 r8 : 8301a300 r7 : e01f5d90 r6 : 8301a300 r5 : 00000000 r4 : 00000000 r3 : fee0007c r2 : 81e27308 r1 : 00000001 r0 : 8145b40c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 83315600 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 8301a300 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe01f4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r8 information: slab kmalloc-192 start 8301a300 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 0xe01f4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Register r12 information: 2-page vmalloc region starting at 0xe01f4000 allocated at kernel_clone+0xc4/0x444 kernel/fork.c:2722 Process syz.2.333 (pid: 5380, stack limit = 0xe01f4000) Stack: (0xe01f5d30 to 0xe01f6000) 5d20: ffffffff 00000004 00000000 82bd2368 5d40: 81e277c8 00000000 e01f5d8c e01f5d58 81457328 8145b634 40946400 00000000 5d60: e01f5d7c 20000600 8301a300 b5403587 40946400 00000003 00000003 84597080 5d80: e01f5e4c e01f5d90 81452b34 8145722c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 0000007c 00000000 00000000 0000000c 00000010 00000006 000007ff 5dc0: 00000c5b 00000005 00000100 00000004 00000001 00000001 0001ffff 00000002 5de0: 00000007 00000083 00000002 01000003 00001b14 00000018 00000000 ffffffff 5e00: ffffffff 0000000b 00000006 0000003b 00000010 10000006 00000660 fffffff8 5e20: 00000000 7c177cc4 00000000 86060580 8301a300 20000600 40946400 00000003 5e40: e01f5f14 e01f5e50 81453e58 81452a6c 00000000 7c177cc4 00000000 00000000 5e60: 82531804 e01f5ea4 0000005f 8477c230 00000064 8301a330 e01f5ee4 e01f5e88 5e80: 807eaa7c 807e0d90 00000064 00000001 00000000 e01f5ea4 830ebe50 83436880 5ea0: 00006400 0000000b e01f5e98 00000000 00000000 7c177cc4 00000000 86060580 5ec0: 40946400 20000600 20000600 86060580 00000003 84597080 e01f5ef4 e01f5ee8 5ee0: 807eabb0 7c177cc4 e01f5f14 00000000 86060581 40946400 20000600 86060580 5f00: 00000003 84597080 e01f5fa4 e01f5f18 805a2344 81453b10 ecac8b10 84597080 5f20: e01f5f3c e01f5f30 81b1b174 81b1b040 e01f5f54 e01f5f40 8025a6ac 8028e2e4 5f40: e01f5fb0 40000000 e01f5f84 e01f5f58 80220be0 8025a668 00000000 82a1c63c 5f60: e01f5fb0 0013e9b0 ecac8b10 80220b34 00000000 7c177cc4 e01f5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84597080 00000036 00000000 e01f5fa8 5fa0: 80200060 805a210c 00000000 00000000 00000003 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f080dc 5fe0: 76f07e88 76f07e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<8145b628>] (parport_attach) from [<81457328>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e277c8 r4:82bd2368 [<81457220>] (comedi_device_attach) from [<81452b34>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84597080 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a300 r4:20000600 [<81452a60>] (do_devconfig_ioctl) from [<81453e58>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8301a300 r4:86060580 [<81453b04>] (comedi_unlocked_ioctl) from [<805a2344>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81453b04>] (comedi_unlocked_ioctl) from [<805a2344>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81453b04>] (comedi_unlocked_ioctl) from [<805a2344>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81453b04>] (comedi_unlocked_ioctl) from [<805a2344>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84597080 r9:00000003 r8:86060580 r7:20000600 r6:40946400 r5:86060581 r4:00000000 [<805a2100>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe01f5fa8 to 0xe01f5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000600 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f080dc 5fe0: 76f07e88 76f07e78 00018ebc 00130810 r10:00000036 r9:84597080 r8:8020029c r7:00000036 r6:00346310 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