8<--- cut here --- Unable to handle kernel paging request at virtual address fee02000 when write [fee02000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 6564 Comm: syz.4.489 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: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 : [<81458fa4>] lr : [<81458f94>] psr: 60000013 sp : ea511d30 ip : ea511d30 fp : ea511d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8334dd80 r7 : ea511d90 r6 : 8334dd80 r5 : 00000000 r4 : 00000000 r3 : fee02000 r2 : 81e276a8 r1 : 00000001 r0 : 81458c04 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 866e3540 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 8334dd80 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea510000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8334dd80 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 0xea510000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea510000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.4.489 (pid: 6564, stack limit = 0xea510000) Stack: (0xea511d30 to 0xea512000) 1d20: 824bca5c 8334dd80 00000000 82bd2abc 1d40: 81e27b68 00000000 ea511d8c ea511d58 81454b08 81458e2c 40946400 00000000 1d60: ea511d7c 20000180 8334dd80 b5403587 40946400 00000003 00000003 83fe5780 1d80: ea511e4c ea511d90 81450314 81454a0c 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00002000 00000007 00000004 00000001 00000006 00000000 00000400 1dc0: 00000007 54c6cff3 000000fd 00000003 00000003 fffffff7 00000000 00000006 1de0: 00000004 00000000 0000007f 00000005 40000003 00000008 00000004 00000004 1e00: 20001e5b 00000003 00000008 00000003 00000006 00004006 00000000 00000003 1e20: 00000000 6422663d 00000000 83338280 8334dd80 20000180 40946400 00000003 1e40: ea511f14 ea511e50 81451638 8145024c 00000000 6422663d 00000000 00000000 1e60: 82531804 ea511ea4 0000005f 84151a28 00000064 8334ddb0 ea511ee4 ea511e88 1e80: 807e97a0 807dfab4 00000064 00000001 00000000 ea511ea4 8335b490 834d4c38 1ea0: 00006400 0000000b ea511e98 00000000 00000000 6422663d 00000000 83338280 1ec0: 40946400 20000180 20000180 83338280 00000003 83fe5780 ea511ef4 ea511ee8 1ee0: 807e98d4 6422663d ea511f14 00000000 83338281 40946400 20000180 83338280 1f00: 00000003 83fe5780 ea511fa4 ea511f18 805a1b0c 814512f0 ecac8b10 83fe5780 1f20: ea511f3c ea511f30 81b17034 81b16f00 ea511f54 ea511f40 8025a6bc 8028e2a4 1f40: ea511fb0 40000000 ea511f84 ea511f58 80220be0 8025a678 00000000 82a1c63c 1f60: ea511fb0 0013e9b0 ecac8b10 80220b34 00000000 6422663d ea511fac 00000000 1f80: 00000000 00346310 00000036 8020029c 83fe5780 00000036 00000000 ea511fa8 1fa0: 80200060 805a18d4 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4b0dc 1fe0: 76f4ae88 76f4ae78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81458e20>] (parport_attach) from [<81454b08>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27b68 r4:82bd2abc [<81454a00>] (comedi_device_attach) from [<81450314>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:83fe5780 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334dd80 r4:20000180 [<81450240>] (do_devconfig_ioctl) from [<81451638>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8334dd80 r4:83338280 [<814512e4>] (comedi_unlocked_ioctl) from [<805a1b0c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814512e4>] (comedi_unlocked_ioctl) from [<805a1b0c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814512e4>] (comedi_unlocked_ioctl) from [<805a1b0c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814512e4>] (comedi_unlocked_ioctl) from [<805a1b0c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83fe5780 r9:00000003 r8:83338280 r7:20000180 r6:40946400 r5:83338281 r4:00000000 [<805a18c8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea511fa8 to 0xea511ff0) 1fa0: 00000000 00000000 00000003 40946400 20000180 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f4b0dc 1fe0: 76f4ae88 76f4ae78 00018ebc 00130810 r10:00000036 r9:83fe5780 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