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: 2053 Comm: syz.4.5078 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 : [<813ce498>] lr : [<813ce488>] psr: 60000013 sp : dfa99d30 ip : dfa99d30 fp : dfa99d54 r10: 82b25910 r9 : 00000003 r8 : 840a0e40 r7 : dfa99d90 r6 : 840a0e40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e177dc r1 : 00000001 r0 : 813ce108 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 98fb8b40 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 840a0e40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa98000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r8 information: slab kmalloc-192 start 840a0e40 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 0xdfa98000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Register r12 information: 2-page vmalloc region starting at 0xdfa98000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2609 Process syz.4.5078 (pid: 2053, stack limit = 0xdfa98000) Stack: (0xdfa99d30 to 0xdfa9a000) 9d20: dfa99d4c dfa99d40 829d1bf4 829d1bf4 9d40: 81e17c9c 840a0e84 dfa99d8c dfa99d58 813ca528 813ce330 200000c0 00000000 9d60: dfa99d7c 200000c0 840a0e40 b5403587 200000c0 8382d400 40946400 00000003 9d80: dfa99e4c dfa99d90 813c6074 813ca42c 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000000 00000004 00000004 00000005 00000005 00000004 9dc0: 00000007 54c6cff3 000000fd 00000002 00000001 00000001 00400001 00000006 9de0: 00000101 00000000 0000007f 00000003 40000003 00000089 0000caa3 00000000 9e00: 20001e5b 00000003 00000e66 00000003 00000008 00004086 00000000 fffffff8 9e20: 00000000 2231114e 00000000 858c3d80 840a0e40 200000c0 200000c0 8382d400 9e40: dfa99f14 dfa99e50 813c7040 813c5f80 00000000 00000000 00000000 2231114e 9e60: 00000000 00000000 824625b4 0000005f 8418c838 840a0e70 8408fcb4 8382d400 9e80: dfa99ee4 dfa99e90 807a7564 8079d95c 00000064 00000001 00000000 dfa99eac 9ea0: 832cb6d0 8342e330 00006400 0000000b dfa99ea0 00000000 00000000 2231114e 9ec0: 858c3d80 40946400 200000c0 200000c0 858c3d80 00000009 dfa99ef4 dfa99ee8 9ee0: 807a7684 2231114e dfa99f14 40946400 00000000 858c3d81 200000c0 858c3d80 9f00: 00000009 8382d400 dfa99fa4 dfa99f18 80578798 813c6a70 ecac8b10 8382d400 9f20: dfa99f3c dfa99f30 81a606d8 81a605a8 dfa99f54 dfa99f40 8025c484 8028d914 9f40: dfa99fb0 40000000 dfa99f84 dfa99f58 802229ec 8025c440 00000000 8281cfb4 9f60: dfa99fb0 0014ca70 ecac8b10 80222940 00000000 2231114e dfa99fac 00000000 9f80: 00000000 00316448 00000036 8020029c 8382d400 00000036 00000000 dfa99fa8 9fa0: 80200060 80578674 00000000 00000000 00000009 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f780bc 9fe0: 76f77ec0 76f77eb0 000195a4 00132510 60000010 00000009 00000000 00000000 Call trace: [<813ce324>] (parport_attach) from [<813ca528>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:840a0e84 r5:81e17c9c r4:829d1bf4 [<813ca420>] (comedi_device_attach) from [<813c6074>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8382d400 r7:200000c0 r6:b5403587 r5:840a0e40 r4:200000c0 [<813c5f74>] (do_devconfig_ioctl) from [<813c7040>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8382d400 r7:200000c0 r6:200000c0 r5:840a0e40 r4:858c3d80 [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813c6a64>] (comedi_unlocked_ioctl) from [<80578798>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:583) r10:8382d400 r9:00000009 r8:858c3d80 r7:200000c0 r6:858c3d81 r5:00000000 r4:40946400 [<80578668>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa99fa8 to 0xdfa99ff0) 9fa0: 00000000 00000000 00000009 40946400 200000c0 00000000 9fc0: 00000000 00000000 00316448 00000036 00300000 00000000 00006364 76f780bc 9fe0: 76f77ec0 76f77eb0 000195a4 00132510 r10:00000036 r9:8382d400 r8:8020029c r7:00000036 r6:00316448 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