8<--- cut here --- Unable to handle kernel paging request at virtual address fee0b013 when write [fee0b013] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 27645 Comm: syz.9.4179 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: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 : [<814329fc>] lr : [<814329ec>] psr: 60000013 sp : e03f9d30 ip : e03f9d30 fp : e03f9d54 r10: 82b2efdc r9 : 00000003 r8 : 84679cc0 r7 : e03f9d90 r6 : 84679cc0 r5 : 00000000 r4 : 00000000 r3 : fee0b013 r2 : 81e24918 r1 : 00000001 r0 : 8143266c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 853acb80 DAC: 00000000 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 84679cc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe03f8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 84679cc0 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 0xe03f8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xe03f8000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.9.4179 (pid: 27645, stack limit = 0xe03f8000) Stack: (0xe03f9d30 to 0xe03fa000) 9d20: 8244439c 84679cc0 829d66c0 829d66c0 9d40: 81e24dd8 00000000 e03f9d8c e03f9d58 8142e570 81432894 40946400 00000000 9d60: e03f9d7c 20000240 84679cc0 b5403587 40946400 00000002 00000003 853d9800 9d80: e03f9e4c e03f9d90 81429d7c 8142e470 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 0000b013 00000002 00000004 00000dd7 000088d7 0000008f 00000002 9dc0: 00008012 00001006 ffffffff 00000005 00000007 10000009 00000003 00800007 9de0: fffffffd 00000008 00000003 00000009 0000008e 00000004 00000003 00000007 9e00: 0000000a 00000004 00000001 0000b0c4 00000800 00020004 00400002 00000022 9e20: 00000000 15169619 00000000 8612be40 84679cc0 20000240 40946400 00000002 9e40: e03f9f14 e03f9e50 8142b0a0 81429cb4 00000000 15169619 00000000 00000000 9e60: 824b857c e03f9ea4 0000005f 8445e058 00000064 84679cf0 e03f9ee4 e03f9e88 9e80: 807ceed0 807c52a8 00000064 00000001 00000000 e03f9ea4 830ce490 834df5d8 9ea0: 00006400 0000000b e03f9e98 00000000 00000000 15169619 00000000 8612be40 9ec0: 40946400 20000240 20000240 8612be40 00000003 853d9800 e03f9ef4 e03f9ee8 9ee0: 807cf000 15169619 e03f9f14 00000000 8612be41 40946400 20000240 8612be40 9f00: 00000003 853d9800 e03f9fa4 e03f9f18 80590398 8142ad58 ecac8b10 853d9800 9f20: e03f9f3c e03f9f30 81ae3014 81ae2ee0 e03f9f54 e03f9f40 8025a824 8028c290 9f40: e03f9fb0 40000000 e03f9f84 e03f9f58 80220bf8 8025a7e0 00000000 8281d2bc 9f60: e03f9fb0 0013e480 ecac8b10 80220b4c 00000000 15169619 e03f9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 853d9800 00000036 00000000 e03f9fa8 9fa0: 80200060 80590160 00000000 00000000 00000003 40946400 20000240 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1d0dc 9fe0: 76f1ce88 76f1ce78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81432888>] (parport_attach) from [<8142e570>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24dd8 r4:829d66c0 [<8142e464>] (comedi_device_attach) from [<81429d7c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:853d9800 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:84679cc0 r4:20000240 [<81429ca8>] (do_devconfig_ioctl) from [<8142b0a0>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000002 r7:40946400 r6:20000240 r5:84679cc0 r4:8612be40 [<8142ad4c>] (comedi_unlocked_ioctl) from [<80590398>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142ad4c>] (comedi_unlocked_ioctl) from [<80590398>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142ad4c>] (comedi_unlocked_ioctl) from [<80590398>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142ad4c>] (comedi_unlocked_ioctl) from [<80590398>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:853d9800 r9:00000003 r8:8612be40 r7:20000240 r6:40946400 r5:8612be41 r4:00000000 [<80590154>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe03f9fa8 to 0xe03f9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000240 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f1d0dc 9fe0: 76f1ce88 76f1ce78 00018ba0 001302e0 r10:00000036 r9:853d9800 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