8<--- cut here --- Unable to handle kernel paging request at virtual address fee00001 when write [fee00001] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4082 Comm: syz.0.58 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 : [<813cb460>] lr : [<813cb450>] psr: 60000013 sp : dfa85d30 ip : dfa85d30 fp : dfa85d54 r10: 82b24900 r9 : 00000003 r8 : 83f33c00 r7 : dfa85d90 r6 : 83f33c00 r5 : 00000000 r4 : 00000000 r3 : fee00001 r2 : 81e1765c r1 : 00000001 r0 : 813cb0d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85a25a80 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 83f33c00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 83f33c00 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 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa84000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.0.58 (pid: 4082, stack limit = 0xdfa84000) Stack: (0xdfa85d30 to 0xdfa86000) 5d20: 823eccc8 83f33c00 829d1b3c 829d1b3c 5d40: 81e17b1c 83f33c44 dfa85d8c dfa85d58 813c74ec 813cb2f8 200000c0 00000000 5d60: dfa85d7c 200000c0 83f33c00 b5403587 200000c0 83a1ec00 40946400 00000003 5d80: dfa85e4c dfa85d90 813c3038 813c73f0 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000001 00000002 00010000 00000004 00000003 00000003 00000003 5dc0: 00000007 0000000a 00000001 00008001 00000004 0000ff6b 00000805 fffffffe 5de0: 00000005 00000000 00000002 00000003 40000003 00000089 0000caa7 000201ff 5e00: 20001e5b 0000000b 00000e6b 0000003c 00000008 0000065c 00000000 fffffff8 5e20: 00000000 4b56f9e2 00000000 8475ad80 83f33c00 200000c0 200000c0 83a1ec00 5e40: dfa85f14 dfa85e50 813c4004 813c2f44 00000000 00000000 00000000 4b56f9e2 5e60: 00000000 00000000 8245d5b4 0000005f 83ca39f0 83f33c30 8412bbdc 83a1ec00 5e80: dfa85ee4 dfa85e90 807a5eac 8079c2a4 00000064 00000001 00000000 dfa85eac 5ea0: 859c0310 8342abb0 00006400 0000000b dfa85ea0 00000000 00000000 4b56f9e2 5ec0: 8475ad80 40946400 200000c0 200000c0 8475ad80 00000003 dfa85ef4 dfa85ee8 5ee0: 807a5fcc 4b56f9e2 dfa85f14 40946400 00000000 8475ad81 200000c0 8475ad80 5f00: 00000003 83a1ec00 dfa85fa4 dfa85f18 80577cd0 813c3a34 ecac8b10 83a1ec00 5f20: dfa85f3c dfa85f30 81a361f8 81a360c8 dfa85f54 dfa85f40 8025c478 8028d90c 5f40: dfa85fb0 40000000 dfa85f84 dfa85f58 802229ec 8025c434 00000000 8281cf74 5f60: dfa85fb0 0014ca70 ecac8b10 80222940 00000000 4b56f9e2 dfa85fac 00000000 5f80: 00000000 00316308 00000036 8020029c 83a1ec00 00000036 00000000 dfa85fa8 5fa0: 80200060 80577bac 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc00bc 5fe0: 76fbfec0 76fbfeb0 000195a4 00132510 60000010 00000003 00000000 00000000 Call trace: [<813cb2ec>] (parport_attach) from [<813c74ec>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83f33c44 r5:81e17b1c r4:829d1b3c [<813c73e4>] (comedi_device_attach) from [<813c3038>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83a1ec00 r7:200000c0 r6:b5403587 r5:83f33c00 r4:200000c0 [<813c2f38>] (do_devconfig_ioctl) from [<813c4004>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:83a1ec00 r7:200000c0 r6:200000c0 r5:83f33c00 r4:8475ad80 [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c3a28>] (comedi_unlocked_ioctl) from [<80577cd0>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:83a1ec00 r9:00000003 r8:8475ad80 r7:200000c0 r6:8475ad81 r5:00000000 r4:40946400 [<80577ba0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa85fa8 to 0xdfa85ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 00316308 00000036 00300000 00000000 00006364 76fc00bc 5fe0: 76fbfec0 76fbfeb0 000195a4 00132510 r10:00000036 r9:83a1ec00 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