8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f27 when write [fee04f27] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4991 Comm: syz.1.483 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 : [<814012a4>] lr : [<81401294>] psr: 60000013 sp : ea7b1d30 ip : ea7b1d30 fp : ea7b1d54 r10: 82b28b30 r9 : 00000003 r8 : 84508b40 r7 : ea7b1d90 r6 : 84508b40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e24f44 r1 : 00000001 r0 : 81400f14 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 860c7480 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 84508b40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea7b0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84508b40 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 0xea7b0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xea7b0000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.483 (pid: 4991, stack limit = 0xea7b0000) Stack: (0xea7b1d30 to 0xea7b2000) 1d20: ea7b1d4c ea7b1d40 829d3948 829d3948 1d40: 81e25404 00000000 ea7b1d8c ea7b1d58 813fced0 8140113c 40946400 00000000 1d60: ea7b1d7c 200000c0 84508b40 b5403587 40946400 84ffc800 00000003 84508b70 1d80: ea7b1e4c ea7b1d90 813f8800 813fcdd0 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000000 00000004 00000004 00000005 00000005 00000007 1dc0: 00000007 54c6cff3 000000fd 00000002 00000007 00000001 00000001 00000006 1de0: 00000005 00000000 0000007f 00000003 40000003 00000089 0000caa3 00000000 1e00: 20001e5b 00000003 00000e66 00000003 00000008 00004086 00000000 fffffff8 1e20: 00000000 dac22a2e 00000000 8563b480 84508b40 200000c0 40946400 84ffc800 1e40: ea7b1f14 ea7b1e50 813f9380 813f8738 00000000 dac22a2e 00000000 00000000 1e60: 824b15ec ea7b1ea4 0000005f 838097f8 00000064 83919cfc ea7b1ee4 ea7b1e88 1e80: 807b404c 807aa6c8 00000064 00000001 00000000 ea7b1ea4 84bf8d90 834dbee0 1ea0: 00006400 0000000b ea7b1e98 00000000 00000000 dac22a2e 00000000 8563b480 1ec0: 40946400 200000c0 200000c0 8563b480 00000003 84ffc800 ea7b1ef4 ea7b1ee8 1ee0: 807b417c dac22a2e ea7b1f14 00000000 8563b481 40946400 200000c0 8563b480 1f00: 00000003 84ffc800 ea7b1fa4 ea7b1f18 8058223c 813f9288 ecac8b10 84ffc800 1f20: ea7b1f3c ea7b1f30 81aa6d78 81aa6c48 ea7b1f54 ea7b1f40 8025ba7c 8028ef68 1f40: ea7b1fb0 40000000 ea7b1f84 ea7b1f58 80221a54 8025ba38 00000000 8281cf7c 1f60: ea7b1fb0 0013ddc0 ecac8b10 802219a8 00000000 dac22a2e ea7b1fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84ffc800 00000036 00000000 ea7b1fa8 1fa0: 80200060 80582004 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc 1fe0: 76f65e88 76f65e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401130>] (parport_attach) from [<813fced0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d3948 [<813fcdc4>] (comedi_device_attach) from [<813f8800>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84508b70 r9:00000003 r8:84ffc800 r7:40946400 r6:b5403587 r5:84508b40 r4:200000c0 [<813f872c>] (do_devconfig_ioctl) from [<813f9380>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:84ffc800 r7:40946400 r6:200000c0 r5:84508b40 r4:8563b480 [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f927c>] (comedi_unlocked_ioctl) from [<8058223c>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:84ffc800 r9:00000003 r8:8563b480 r7:200000c0 r6:40946400 r5:8563b481 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea7b1fa8 to 0xea7b1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f660dc 1fe0: 76f65e88 76f65e78 00018734 0012fc20 r10:00000036 r9:84ffc800 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