8<--- cut here --- Unable to handle kernel paging request at virtual address fee04fa7 when write [fee04fa7] *pgd=80000080007003 , *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 3872 Comm: syz.0.59 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 : ea999d30 ip : ea999d30 fp : ea999d54 r10: 82b2f06c r9 : 00000003 r8 : 8301a6c0 r7 : ea999d90 r6 : 8301a6c0 r5 : 00000000 r4 : 00000000 r3 : fee04fa7 r2 : 81e24af8 r1 : 00000001 r0 : 81433c84 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85e88ac0 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 8301a6c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea998000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r8 information: slab kmalloc-192 start 8301a6c0 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 0xea998000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Register r12 information: 2-page vmalloc region starting at 0xea998000 allocated at kernel_clone+0xac/0x42c kernel/fork.c:2653 Process syz.0.59 (pid: 3872, stack limit = 0xea998000) Stack: (0xea999d30 to 0xea99a000) 9d20: 82444c00 8301a6c0 829d6740 829d6740 9d40: 81e24fb8 00000000 ea999d8c ea999d58 8142fb8c 81433eac 40946400 00000000 9d60: ea999d7c 200000c0 8301a6c0 b5403587 40946400 00000003 00000003 831f6200 9d80: ea999e4c ea999d90 8142b398 8142fa8c 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004fa7 00000105 00000002 10000421 02000001 00000cc7 7ffffffe 9dc0: 00000006 00000006 000003ff 00000002 00000300 00000001 00000003 00000009 9de0: 00000000 00040400 00000008 000048f3 80000000 80000089 0000000a 01400000 9e00: 20001e52 ffffeadb 00000003 0000003d 00000008 00000004 fffffffa 0000485b 9e20: 00000000 f51005f5 00000000 83e70f00 8301a6c0 200000c0 40946400 00000003 9e40: ea999f14 ea999e50 8142c6bc 8142b2d0 00000000 f51005f5 00000000 00000000 9e60: 824b957c ea999ea4 0000005f 83ef0a30 00000064 8301a6f0 ea999ee4 ea999e88 9e80: 807cf448 807c5820 00000064 00000001 00000000 ea999ea4 8338e250 834f0dd0 9ea0: 00006400 0000000b ea999e98 00000000 00000000 f51005f5 00000000 83e70f00 9ec0: 40946400 200000c0 200000c0 83e70f00 00000003 831f6200 ea999ef4 ea999ee8 9ee0: 807cf578 f51005f5 ea999f14 00000000 83e70f01 40946400 200000c0 83e70f00 9f00: 00000003 831f6200 ea999fa4 ea999f18 805908e4 8142c374 ecac8b10 831f6200 9f20: ea999f3c ea999f30 81ae5234 81ae5100 ea999f54 ea999f40 8025a87c 8028c380 9f40: ea999fb0 40000000 ea999f84 ea999f58 80220bf8 8025a838 00000000 8281d2fc 9f60: ea999fb0 0013e480 ecac8b10 80220b4c 00000000 f51005f5 ea999fac 00000000 9f80: 00000000 00346310 00000036 8020029c 831f6200 00000036 00000000 ea999fa8 9fa0: 80200060 805906ac 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fda0dc 9fe0: 76fd9e88 76fd9e78 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) r10:831f6200 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301a6c0 r4:200000c0 [<8142b2c4>] (do_devconfig_ioctl) from [<8142c6bc>] (comedi_unlocked_ioctl+0x354/0x1dbc drivers/comedi/comedi_fops.c:2300) r8:00000003 r7:40946400 r6:200000c0 r5:8301a6c0 r4:83e70f00 [<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) r10:831f6200 r9:00000003 r8:83e70f00 r7:200000c0 r6:40946400 r5:83e70f01 r4:00000000 [<805906a0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea999fa8 to 0xea999ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fda0dc 9fe0: 76fd9e88 76fd9e78 00018ba0 001302e0 r10:00000036 r9:831f6200 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