8<--- cut here --- Unable to handle kernel paging request at virtual address fee02000 when write [fee02000] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 3454 Comm: syz.8.15059 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81458be4>] lr : [<81458bd4>] psr: 60000013 sp : e019dd30 ip : e019dd30 fp : e019dd54 r10: 82d2cdc4 r9 : 00000003 r8 : 8334c540 r7 : e019dd90 r6 : 8334c540 r5 : 00000000 r4 : 00000000 r3 : fee02000 r2 : 81e276c8 r1 : 00000001 r0 : 81458844 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 86bc25c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8334c540 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe019c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8334c540 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 0xe019c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xe019c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.8.15059 (pid: 3454, stack limit = 0xe019c000) Stack: (0xe019dd30 to 0xe019e000) dd20: 824bca48 8334c540 00000000 82bd2abc dd40: 81e27b88 00000000 e019dd8c e019dd58 81454748 81458a6c 40946400 00000000 dd60: e019dd7c 20000180 8334c540 b5403587 40946400 00000003 00000003 87549900 dd80: e019de4c e019dd90 8144ff54 8145464c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00002000 00000007 00000004 00000001 00000006 00000000 00000400 ddc0: 00000007 54c6cff3 000000fd 00000003 00000003 fffffff7 00000000 00000006 dde0: 00000004 00000000 0000007f 00000005 40000003 00000008 00000004 00000004 de00: 20001e5b 00000003 00000008 00000003 00000006 00004006 00000000 00000003 de20: 00000000 ecd01073 00000000 83330800 8334c540 20000180 40946400 00000003 de40: e019df14 e019de50 81451278 8144fe8c 00000000 ecd01073 00000000 00000000 de60: 82531804 e019dea4 0000005f 84197678 00000064 8334c570 e019dee4 e019de88 de80: 807e9760 807dfa74 00000064 00000001 00000000 e019dea4 860793d0 834e8330 dea0: 00006400 0000000b e019de98 00000000 00000000 ecd01073 00000000 83330800 dec0: 40946400 20000180 20000180 83330800 00000003 87549900 e019def4 e019dee8 dee0: 807e9894 ecd01073 e019df14 00000000 83330801 40946400 20000180 83330800 df00: 00000003 87549900 e019dfa4 e019df18 805a1adc 81450f30 ecac8b10 87549900 df20: e019df3c e019df30 81b16c74 81b16b40 e019df54 e019df40 8025a6bc 8028e2a4 df40: e019dfb0 40000000 e019df84 e019df58 80220be0 8025a678 00000000 82a1c63c df60: e019dfb0 0013e9b0 ecac8b10 80220b34 00000000 ecd01073 e019dfac 00000000 df80: 00000000 00346310 00000036 8020029c 87549900 00000036 00000000 e019dfa8 dfa0: 80200060 805a18a4 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f680dc dfe0: 76f67e88 76f67e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81458a60>] (parport_attach) from [<81454748>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27b88 r4:82bd2abc [<81454640>] (comedi_device_attach) from [<8144ff54>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:87549900 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334c540 r4:20000180 [<8144fe80>] (do_devconfig_ioctl) from [<81451278>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8334c540 r4:83330800 [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81450f24>] (comedi_unlocked_ioctl) from [<805a1adc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:87549900 r9:00000003 r8:83330800 r7:20000180 r6:40946400 r5:83330801 r4:00000000 [<805a1898>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe019dfa8 to 0xe019dff0) dfa0: 00000000 00000000 00000003 40946400 20000180 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f680dc dfe0: 76f67e88 76f67e78 00018ebc 00130810 r10:00000036 r9:87549900 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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