8<--- cut here --- Unable to handle kernel paging request at virtual address fee0afff when write [fee0afff] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 5503 Comm: syz.4.160 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 : [<814339b4>] lr : [<814339a4>] psr: 60000013 sp : dfa5dd30 ip : dfa5dd30 fp : dfa5dd54 r10: 82b2f064 r9 : 00000003 r8 : 8337e9c0 r7 : dfa5dd90 r6 : 8337e9c0 r5 : 00000000 r4 : 00000000 r3 : fee0afff r2 : 81e24a18 r1 : 00000001 r0 : 81433624 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85391380 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 8337e9c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa5c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r8 information: slab kmalloc-192 start 8337e9c0 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 0xdfa5c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Register r12 information: 2-page vmalloc region starting at 0xdfa5c000 allocated at kernel_clone+0xac/0x428 kernel/fork.c:2654 Process syz.4.160 (pid: 5503, stack limit = 0xdfa5c000) Stack: (0xdfa5dd30 to 0xdfa5e000) dd20: 8244499c 8337e9c0 829d6700 829d6700 dd40: 81e24ed8 00000000 dfa5dd8c dfa5dd58 8142f52c 8143384c 40946400 00000000 dd60: dfa5dd7c 20000240 8337e9c0 b5403587 40946400 00000002 00000003 84f66c00 dd80: dfa5de4c dfa5dd90 8142ad38 8142f42c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 0000afff 00000033 80010000 00000004 00000008 0000208f 00000006 ddc0: 00008012 00001007 c0000000 10000005 fffffffd 00000001 00000000 00000005 dde0: fdfffffa 000000e8 00000006 00000009 0000008e 02000005 00000005 0000000f de00: 0000000b 00000004 00000005 0000b0c4 00000006 00020002 00400002 00000022 de20: 00000000 9fdc4a9d 00000000 838b0f00 8337e9c0 20000240 40946400 00000002 de40: dfa5df14 dfa5de50 8142c05c 8142ac70 00000000 9fdc4a9d 00000000 00000000 de60: 824b857c dfa5dea4 0000005f 8412fde0 00000064 8337e9f0 dfa5dee4 dfa5de88 de80: 807cf200 807c55d8 00000064 00000001 00000000 dfa5dea4 8338fe50 834ea550 dea0: 00006400 0000000b dfa5de98 00000000 00000000 9fdc4a9d dfa5dfa4 dfa5dec8 dec0: 80200bec 81ab2af0 00000000 40946400 80811501 8412fde0 00000000 838b0f01 dee0: 40946400 9fdc4a9d 838b0f00 00000000 838b0f01 40946400 20000240 838b0f00 df00: 00000003 84f66c00 dfa5dfa4 dfa5df18 805906a8 8142bd14 ecac8b10 84f66c00 df20: dfa5df3c dfa5df30 81ae4734 81ae4600 dfa5df54 dfa5df40 8025a824 8028c290 df40: dfa5dfb0 40000000 dfa5df84 dfa5df58 80220bf8 8025a7e0 00000000 8281d2bc df60: dfa5dfb0 0013e480 ecac8b10 80220b4c 00000000 9fdc4a9d dfa5dfac 00000000 df80: 00000000 00346310 00000036 8020029c 84f66c00 00000036 00000000 dfa5dfa8 dfa0: 80200060 80590470 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff80dc dfe0: 76ff7e88 76ff7e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81433840>] (parport_attach) from [<8142f52c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24ed8 r4:829d6700 [<8142f420>] (comedi_device_attach) from [<8142ad38>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:84f66c00 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:8337e9c0 r4:20000240 [<8142ac64>] (do_devconfig_ioctl) from [<8142c05c>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000002 r7:40946400 r6:20000240 r5:8337e9c0 r4:838b0f00 [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142bd08>] (comedi_unlocked_ioctl) from [<805906a8>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84f66c00 r9:00000003 r8:838b0f00 r7:20000240 r6:40946400 r5:838b0f01 r4:00000000 [<80590464>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa5dfa8 to 0xdfa5dff0) dfa0: 00000000 00000000 00000003 40946400 20000240 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff80dc dfe0: 76ff7e88 76ff7e78 00018ba0 001302e0 r10:00000036 r9:84f66c00 r8:8020029c r7:00000036 r6:00346310 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