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: 1 UID: 0 PID: 8062 Comm: syz.0.980 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 : [<81408ef8>] lr : [<81408ee8>] psr: 60000013 sp : dfb69d28 ip : dfb69d28 fp : dfb69d4c r10: 82b28ad8 r9 : 00000003 r8 : 84565540 r7 : dfb69d88 r6 : 84565540 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e1a318 r1 : 00000001 r0 : 81408b68 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8727bec0 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 84565540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84565540 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 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb68000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2651 Process syz.0.980 (pid: 8062, stack limit = 0xdfb68000) Stack: (0xdfb69d28 to 0xdfb6a000) 9d20: 82432f74 84565540 829d3f08 829d3f08 81e1a7d8 84565584 9d40: dfb69d84 dfb69d50 81404ba4 81408d90 84565570 00000000 dfb69d74 200000c0 9d60: 84565540 b5403587 84565570 83f03c00 40946400 00000003 dfb69e44 dfb69d88 9d80: 814004fc 81404aa8 656d6f63 705f6964 6f707261 00007472 00000000 00004f27 9da0: 00000002 00000004 00000006 00000005 00000005 00000004 00000007 54c6cff3 9dc0: 000000fd 00000002 00008401 00000001 00000001 00000006 00000101 00000000 9de0: 00000892 0000a418 40000001 00000005 0000caa3 00000000 20001e5b 00000000 9e00: 00000e66 00000004 00000008 00004086 00000000 fffffff8 00000000 69e81758 9e20: 00000000 871df900 84565540 200000c0 84565570 83f03c00 dfb69f14 dfb69e48 9e40: 814014f0 81400408 00000000 00000000 00000000 00000000 00000000 69e81758 9e60: 00000000 00000000 824a35ec 0000005f 840bec28 00000064 844e1564 83f03c00 9e80: dfb69ee4 dfb69e90 807b8030 807ae554 00000064 00000001 00000000 dfb69eac 9ea0: 85c34850 834d9b28 00006400 0000000b dfb69ea0 00000000 00000000 69e81758 9ec0: 871df900 40946400 200000c0 200000c0 871df900 00000003 dfb69ef4 dfb69ee8 9ee0: 807b8150 69e81758 dfb69f14 40946400 00000000 871df901 200000c0 871df900 9f00: 00000003 83f03c00 dfb69fa4 dfb69f18 805856b8 81400f40 ecac8b10 83f03c00 9f20: dfb69f3c dfb69f30 81aafc8c 81aafb5c dfb69f54 dfb69f40 8025bcbc 8028e0c4 9f40: dfb69fb0 40000000 dfb69f84 dfb69f58 80221a38 8025bc78 00000000 8281d17c 9f60: dfb69fb0 0014c8c0 ecac8b10 8022198c 00000000 69e81758 dfb69fac 00000000 9f80: 00000000 00326310 00000036 8020029c 83f03c00 00000036 00000000 dfb69fa8 9fa0: 80200060 80585594 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fe10bc 9fe0: 76fe0ec0 76fe0eb0 000192bc 00132360 60000010 00000003 00000000 00000000 Call trace: [<81408d84>] (parport_attach) from [<81404ba4>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1069) r6:84565584 r5:81e1a7d8 r4:829d3f08 [<81404a9c>] (comedi_device_attach) from [<814004fc>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:928) r10:00000003 r9:40946400 r8:83f03c00 r7:84565570 r6:b5403587 r5:84565540 r4:200000c0 [<814003fc>] (do_devconfig_ioctl) from [<814014f0>] (comedi_unlocked_ioctl+0x5bc/0x1c2c drivers/comedi/comedi_fops.c:2240) r8:83f03c00 r7:84565570 r6:200000c0 r5:84565540 r4:871df900 [<81400f34>] (comedi_unlocked_ioctl) from [<805856b8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81400f34>] (comedi_unlocked_ioctl) from [<805856b8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81400f34>] (comedi_unlocked_ioctl) from [<805856b8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81400f34>] (comedi_unlocked_ioctl) from [<805856b8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83f03c00 r9:00000003 r8:871df900 r7:200000c0 r6:871df901 r5:00000000 r4:40946400 [<80585588>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb69fa8 to 0xdfb69ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00326310 00000036 00310000 00000000 00006364 76fe10bc 9fe0: 76fe0ec0 76fe0eb0 000192bc 00132360 r10:00000036 r9:83f03c00 r8:8020029c r7:00000036 r6:00326310 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