8<--- cut here --- Unable to handle kernel paging request at virtual address fee00003 when write [fee00003] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 10069 Comm: syz.5.1489 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 : [<813ce490>] lr : [<813ce480>] psr: 60000013 sp : dfac9d30 ip : dfac9d30 fp : dfac9d54 r10: 82b25910 r9 : 00000003 r8 : 840ac240 r7 : dfac9d90 r6 : 840ac240 r5 : 00000000 r4 : 00000000 r3 : fee00003 r2 : 81e1773c r1 : 00000001 r0 : 813ce100 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8499be40 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 840ac240 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840ac240 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 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfac8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.5.1489 (pid: 10069, stack limit = 0xdfac8000) Stack: (0xdfac9d30 to 0xdfaca000) 9d20: dfac9d4c dfac9d40 829d1bf4 829d1bf4 9d40: 81e17bfc 840ac284 dfac9d8c dfac9d58 813ca520 813ce328 20000140 00000000 9d60: dfac9d7c 20000140 840ac240 b5403587 20000140 85421800 40946400 00000000 9d80: dfac9e4c dfac9d90 813c606c 813ca424 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000003 00000000 00000003 00000005 0000002f 00000007 00000007 9dc0: 00000005 00000ffe 00000001 00000000 00008500 00001003 00000004 0000ffff 9de0: 0000ffff ffffffa8 7ffffffd 000001ff 00000003 00000010 00000000 0000000b 9e00: 0000e2df 0000746f 00000008 00000005 00000003 00000000 00000004 00008049 9e20: 00000000 a0b5f160 00000000 85b1e780 840ac240 20000140 20000140 85421800 9e40: dfac9f14 dfac9e50 813c7038 813c5f78 00000000 00000000 00000000 a0b5f160 9e60: 00000000 00000000 824625b4 0000005f 84202640 840ac270 841db5f4 85421800 9e80: dfac9ee4 dfac9e90 807a779c 8079db94 00000064 00000001 00000000 dfac9eac 9ea0: 857b1910 834e7770 00006400 0000000b dfac9ea0 00000000 00000000 a0b5f160 9ec0: 85b1e780 40946400 20000140 20000140 85b1e780 00000003 dfac9ef4 dfac9ee8 9ee0: 807a78bc a0b5f160 dfac9f14 40946400 00000000 85b1e781 20000140 85b1e780 9f00: 00000003 85421800 dfac9fa4 dfac9f18 805789d0 813c6a68 ecac8b10 85421800 9f20: dfac9f3c dfac9f30 81a608b8 81a60788 dfac9f54 dfac9f40 8025c484 8028d914 9f40: dfac9fb0 40000000 dfac9f84 dfac9f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfac9fb0 0014ced0 ecac8b10 80222940 00000000 a0b5f160 dfac9fac 00000000 9f80: 00000000 00316308 00000036 8020029c 85421800 00000036 00000000 dfac9fa8 9fa0: 80200060 805788ac 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fa70bc 9fe0: 76fa6ec0 76fa6eb0 0001928c 00132970 60000010 00000003 00000000 00000000 Call trace: [<813ce31c>] (parport_attach) from [<813ca520>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840ac284 r5:81e17bfc r4:829d1bf4 [<813ca418>] (comedi_device_attach) from [<813c606c>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000000 r9:40946400 r8:85421800 r7:20000140 r6:b5403587 r5:840ac240 r4:20000140 [<813c5f6c>] (do_devconfig_ioctl) from [<813c7038>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85421800 r7:20000140 r6:20000140 r5:840ac240 r4:85b1e780 [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a5c>] (comedi_unlocked_ioctl) from [<805789d0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:85421800 r9:00000003 r8:85b1e780 r7:20000140 r6:85b1e781 r5:00000000 r4:40946400 [<805788a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac9fa8 to 0xdfac9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000140 00000000 9fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fa70bc 9fe0: 76fa6ec0 76fa6eb0 0001928c 00132970 r10:00000036 r9:85421800 r8:8020029c r7:00000036 r6:00316308 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