8<--- cut here --- Unable to handle kernel paging request at virtual address fee08000 when write [fee08000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3822 Comm: syz.1.34 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<814d95f8>] lr : [<814d95ec>] psr: 60000013 sp : df9b5d30 ip : df9b5d30 fp : df9b5d54 r10: 835316f0 r9 : 00000003 r8 : 84b52cc0 r7 : df9b5d90 r6 : df9b5d90 r5 : 84b52cc0 r4 : 00000000 r3 : fee08000 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86a68080 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer Register r3 information: 0-page vmalloc region starting at 0xfee00000 allocated at pci_reserve_io+0x0/0x38 arch/arm/mm/mmu.c:1048 Register r4 information: NULL pointer Register r5 information: slab kmalloc-192 start 84b52cc0 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdf9b4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r7 information: 2-page vmalloc region starting at 0xdf9b4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r8 information: slab kmalloc-192 start 84b52cc0 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 0xdf9b4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Register r12 information: 2-page vmalloc region starting at 0xdf9b4000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2771 Process syz.1.34 (pid: 3822, stack limit = 0xdf9b4000) Stack: (0xdf9b5d30 to 0xdf9b6000) 5d20: ffffffff 00000004 833d88c0 81e32f28 5d40: 00000000 df9b5d90 df9b5d8c df9b5d58 814d5288 814d95a8 40946400 00000000 5d60: df9b5d7c 20001a00 84b52cc0 b5403587 40946400 00000003 00000003 85a03e80 5d80: df9b5e4c df9b5d90 814d0a8c 814d518c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00008000 00000020 00000004 20000001 00000025 00000000 00000400 5dc0: 00000002 54c6cff3 000000fd 00000002 00000007 fffffff7 00400001 00000006 5de0: 00000008 00000000 0000007f 00000003 40000003 00240089 00000002 00000004 5e00: 30001e59 00000005 00000009 00000003 00000006 00004006 00000000 00000003 5e20: 00000000 bd2d471f 00000000 8402dd00 84b52cc0 20001a00 40946400 00000003 5e40: df9b5f14 df9b5e50 814d1db4 814d09cc 00000000 bd2d471f 00000000 00000000 5e60: 8254886c df9b5ea4 0000005f 84aee058 00000064 84b52cf0 df9b5ee4 df9b5e88 5e80: 8082bd0c 80822098 00000064 00000001 00000000 df9b5ea4 8698a410 83ce6660 5ea0: 00006400 0000000b df9b5e98 00000000 00000000 bd2d471f 00000000 8402dd00 5ec0: 40946400 20001a00 20001a00 8402dd00 00000003 85a03e80 df9b5ef4 df9b5ee8 5ee0: 8082be40 bd2d471f df9b5f14 00000000 8402dd01 40946400 20001a00 8402dd00 5f00: 00000003 85a03e80 df9b5fa4 df9b5f18 805d39dc 814d1a6c ecac8b10 85a03e80 5f20: df9b5f3c df9b5f30 81bb0d00 81bb0bcc df9b5f54 df9b5f40 8025b9d4 8028f74c 5f40: df9b5fb0 40000000 df9b5f84 df9b5f58 80221bdc 8025b98c 00000000 8321a04c 5f60: df9b5fb0 0013ec60 ecac8b10 80221b30 00000000 bd2d471f df9b5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 85a03e80 00000036 00000000 df9b5fa8 5fa0: 80200060 805d37a4 00000000 00000000 00000003 40946400 20001a00 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f0e0dc 5fe0: 76f0de88 76f0de78 00019004 00130ac0 60000010 00000003 00000000 00000000 Call trace: [<814d959c>] (parport_attach) from [<814d5288>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:df9b5d90 r6:00000000 r5:81e32f28 r4:833d88c0 [<814d5180>] (comedi_device_attach) from [<814d0a8c>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:85a03e80 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84b52cc0 r4:20001a00 [<814d09c0>] (do_devconfig_ioctl) from [<814d1db4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20001a00 r5:84b52cc0 r4:8402dd00 [<814d1a60>] (comedi_unlocked_ioctl) from [<805d39dc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814d1a60>] (comedi_unlocked_ioctl) from [<805d39dc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814d1a60>] (comedi_unlocked_ioctl) from [<805d39dc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814d1a60>] (comedi_unlocked_ioctl) from [<805d39dc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:85a03e80 r9:00000003 r8:8402dd00 r7:20001a00 r6:40946400 r5:8402dd01 r4:00000000 [<805d3798>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9b5fa8 to 0xdf9b5ff0) 5fa0: 00000000 00000000 00000003 40946400 20001a00 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f0e0dc 5fe0: 76f0de88 76f0de78 00019004 00130ac0 r10:00000036 r9:85a03e80 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb57197 e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb57197 bl 0xfed5c664 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction