8<--- cut here --- Unable to handle kernel paging request at virtual address fe Unable to handle kernel paging request at virtual address fee00d00 when write [fee00d00] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 6106 Comm: syz.2.703 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 : [<81434014>] lr : [<81434004>] psr: 60000013 sp : dfde5d30 ip : dfde5d30 fp : dfde5d54 r10: 82b2f06c r9 : 00000003 r8 : 84732840 r7 : dfde5d90 r6 : 84732840 r5 : 00000000 r4 : 00000000 r3 : fee00d00 r2 : 81e24af8 r1 : 00000001 r0 : 81433c84 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 868ed900 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 84732840 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfde4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 84732840 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 0xdfde4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xdfde4000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.2.703 (pid: 6106, stack limit = 0xdfde4000) Stack: (0xdfde5d30 to 0xdfde6000) 5d20: 82444c00 84732840 829d6740 829d6740 5d40: 81e24fb8 00000000 dfde5d8c dfde5d58 8142fb8c 81433eac 40946400 00000000 5d60: dfde5d7c 20000180 84732840 b5403587 40946400 00000003 00000003 83816e40 5d80: dfde5e4c dfde5d90 8142b398 8142fa8c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000d00 00000002 00000001 00000000 00004003 00000002 00000008 5dc0: 00000007 00000005 00000040 00000002 00000001 0000000b 00000002 00000006 5de0: 0000000c 00000001 00000005 00000005 40001001 00000005 0000ffff 00000f27 5e00: 00000008 0000800b 00000008 00000005 00000006 00000008 0000ffff fffffff4 5e20: 00000000 0488a3ee 00000000 85221480 84732840 20000180 40946400 00000003 5e40: dfde5f14 dfde5e50 8142c6bc 8142b2d0 00000000 0488a3ee 00000000 00000000 5e60: 824b957c dfde5ea4 0000005f 8417f210 00000064 84732870 dfde5ee4 dfde5e88 5e80: 807cf448 807c5820 00000064 00000001 00000000 dfde5ea4 8338d6d0 834186e8 5ea0: 00006400 0000000b dfde5e98 00000000 00000000 0488a3ee 00000000 85221480 5ec0: 40946400 20000180 20000180 85221480 00000003 83816e40 dfde5ef4 dfde5ee8 5ee0: 807cf578 0488a3ee dfde5f14 00000000 85221481 40946400 20000180 85221480 5f00: 00000003 83816e40 dfde5fa4 dfde5f18 805908e4 8142c374 ecac8b10 83816e40 5f20: dfde5f3c dfde5f30 81ae5234 81ae5100 dfde5f54 dfde5f40 8025a87c 8028c380 5f40: dfde5fb0 40000000 dfde5f84 dfde5f58 80220bf8 8025a838 00000000 8281d2fc 5f60: dfde5fb0 0013e480 ecac8b10 80220b4c 00000000 0488a3ee dfde5fac 00000000 5f80: 00000000 00346310 00000036 8020029c 83816e40 00000036 00000000 dfde5fa8 5fa0: 80200060 805906ac 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f070dc 5fe0: 76f06e88 76f06e78 00018ba0 001302e0 60000010 00000003 00000000 00000000 Call trace: [<81433ea0>] (parport_attach) from [<8142fb8c>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e24fb8 r4:829d6740 [<8142fa80>] (comedi_device_attach) from [<8142b398>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:83816e40 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:84732840 r4:20000180 [<8142b2c4>] (do_devconfig_ioctl) from [<8142c6bc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:20000180 r5:84732840 r4:85221480 [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8142c368>] (comedi_unlocked_ioctl) from [<805908e4>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83816e40 r9:00000003 r8:85221480 r7:20000180 r6:40946400 r5:85221481 r4:00000000 [<805906a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfde5fa8 to 0xdfde5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f070dc 5fe0: 76f06e88 76f06e78 00018ba0 001302e0 r10:00000036 r9:83816e40 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