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: 5175 Comm: syz.1.279 Not tainted 6.17.0-rc1-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 : [<813ab4e0>] lr : [<813ab4d0>] psr: 60000013 sp : dfa65d30 ip : dfa65d30 fp : dfa65d54 r10: 82b16f00 r9 : 00000003 r8 : 840c6b40 r7 : dfa65d90 r6 : 840c6b40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15464 r1 : 00000001 r0 : 813ab150 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85c498c0 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 840c6b40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 840c6b40 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 0xdfa64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa64000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.279 (pid: 5175, stack limit = 0xdfa64000) Stack: (0xdfa65d30 to 0xdfa66000) 5d20: 823fe3b4 840c6b40 829cf92c 829cf92c 5d40: 81e15924 840c6b84 dfa65d8c dfa65d58 813a7578 813ab378 200000c0 00000000 5d60: dfa65d7c 200000c0 840c6b40 b5403587 200000c0 83ab6c00 40946400 00000003 5d80: dfa65e4c dfa65d90 813a30f8 813a747c 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 00000003 00010000 00000001 00000066 00000008 0000000c 5dc0: ffffffff 0000000a 00000100 00000006 01000001 0000005f 00000005 00000000 5de0: 80000101 00000005 0001a449 00000003 40020003 00000000 00000001 00000d2a 5e00: 000000ae 000000ea 00000008 0000003c 00000001 00000006 00000003 01000000 5e20: 00000000 cf0f7856 00000000 85746240 840c6b40 200000c0 200000c0 83ab6c00 5e40: dfa65f14 dfa65e50 813a40c4 813a3004 00000000 00000000 00000000 cf0f7856 5e60: 00000000 00000000 8247054c 0000005f 83ff6858 840c6b70 840febdc 83ab6c00 5e80: dfa65ee4 dfa65e90 8079782c 8078db90 00000064 00000001 00000000 dfa65eac 5ea0: 858d7e50 8343dc38 00006400 0000000b dfa65ea0 00000000 00000000 cf0f7856 5ec0: 85746240 40946400 200000c0 200000c0 85746240 00000003 dfa65ef4 dfa65ee8 5ee0: 8079794c cf0f7856 dfa65f14 40946400 00000000 85746241 200000c0 85746240 5f00: 00000003 83ab6c00 dfa65fa4 dfa65f18 8056ce00 813a3af4 ecac8b10 83ab6c00 5f20: dfa65f3c dfa65f30 81a39338 81a39208 dfa65f54 dfa65f40 8025e490 8028ef8c 5f40: dfa65fb0 40000000 dfa65f84 dfa65f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfa65fb0 0014c820 ecac8b10 80222940 00000000 cf0f7856 dfa65fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 83ab6c00 00000036 00000000 dfa65fa8 5fa0: 80200060 8056ccdc 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f420bc 5fe0: 76f41ec0 76f41eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab36c>] (parport_attach) from [<813a7578>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:840c6b84 r5:81e15924 r4:829cf92c [<813a7470>] (comedi_device_attach) from [<813a30f8>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:83ab6c00 r7:200000c0 r6:b5403587 r5:840c6b40 r4:200000c0 [<813a2ff8>] (do_devconfig_ioctl) from [<813a40c4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:83ab6c00 r7:200000c0 r6:200000c0 r5:840c6b40 r4:85746240 [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3ae8>] (comedi_unlocked_ioctl) from [<8056ce00>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83ab6c00 r9:00000003 r8:85746240 r7:200000c0 r6:85746241 r5:00000000 r4:40946400 [<8056ccd0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa65fa8 to 0xdfa65ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f420bc 5fe0: 76f41ec0 76f41eb0 0001948c 001322c0 r10:00000036 r9:83ab6c00 r8:8020029c r7:00000036 r6:002f6308 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