8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f23 when write [fee04f23] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 9982 Comm: syz.1.1752 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 : [<814013b4>] lr : [<814013a4>] psr: 60000013 sp : ea8cdd30 ip : ea8cdd30 fp : ea8cdd54 r10: 82b29b30 r9 : 00000003 r8 : 845b8540 r7 : ea8cdd90 r6 : 845b8540 r5 : 00000000 r4 : 00000000 r3 : fee04f23 r2 : 81e24f44 r1 : 00000001 r0 : 81401024 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8454ea00 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 845b8540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea8cc000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 845b8540 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 0xea8cc000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea8cc000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.1752 (pid: 9982, stack limit = 0xea8cc000) Stack: (0xea8cdd30 to 0xea8ce000) dd20: ea8cdd4c ea8cdd40 829d4280 829d4280 dd40: 81e25404 00000000 ea8cdd8c ea8cdd58 813fcfe0 8140124c 40946400 00000000 dd60: ea8cdd7c 200000c0 845b8540 b5403587 40946400 8386bc00 00000003 845b8570 dd80: ea8cde4c ea8cdd90 813f8918 813fcee0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f23 00000000 00000002 00000009 00000001 40000cc7 00200fff ddc0: 5c952399 00000005 000003ff 00000802 00000008 00010001 00000001 00000009 dde0: 0000e1cb 00000006 00000402 00000003 00000395 80000089 fffffffd 00000009 de00: fffffff5 ffffeadb 00000007 0000003c 00000008 00000003 08000000 00002ec0 de20: 00000000 2db3ba7f 00000000 852aae40 845b8540 200000c0 40946400 8386bc00 de40: ea8cdf14 ea8cde50 813f9498 813f8850 ea8cde4c 2db3ba7f 00000000 00000000 de60: 824b15ec ea8cdea4 0000005f 8414c448 00000064 845768c4 ea8cdee4 ea8cde88 de80: 807b4124 807aa7a0 00000064 00000001 00000000 ea8cdea4 851aa310 8343ccc0 dea0: 00006400 0000000b ea8cde98 00000000 ea8cdd38 2db3ba7f 00000000 852aae40 dec0: 40946400 200000c0 200000c0 852aae40 00000003 8386bc00 ea8cdef4 ea8cdee8 dee0: 807b4254 2db3ba7f ea8cdf14 00000000 852aae41 40946400 200000c0 852aae40 df00: 00000003 8386bc00 ea8cdfa4 ea8cdf18 805821a4 813f93a0 ecac8b10 8386bc00 df20: ea8cdf3c ea8cdf30 81aa6e78 81aa6d48 ea8cdf54 ea8cdf40 8025ba7c 8028ef68 df40: ea8cdfb0 40000000 ea8cdf84 ea8cdf58 80221a54 8025ba38 00000000 8281cf7c df60: ea8cdfb0 0013ddc0 ecac8b10 802219a8 00000000 2db3ba7f ea8cdfac 00000000 df80: 00000000 00346310 00000036 8020029c 8386bc00 00000036 00000000 ea8cdfa8 dfa0: 80200060 80581f6c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f750dc dfe0: 76f74e88 76f74e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401240>] (parport_attach) from [<813fcfe0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d4280 [<813fced4>] (comedi_device_attach) from [<813f8918>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:845b8570 r9:00000003 r8:8386bc00 r7:40946400 r6:b5403587 r5:845b8540 r4:200000c0 [<813f8844>] (do_devconfig_ioctl) from [<813f9498>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:8386bc00 r7:40946400 r6:200000c0 r5:845b8540 r4:852aae40 [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9394>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:8386bc00 r9:00000003 r8:852aae40 r7:200000c0 r6:40946400 r5:852aae41 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea8cdfa8 to 0xea8cdff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f750dc dfe0: 76f74e88 76f74e78 00018734 0012fc20 r10:00000036 r9:8386bc00 r8:8020029c r7:00000036 r6:00346310 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