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: 3695 Comm: syz.0.8969 Not tainted 6.16.0-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 : [<813ab000>] lr : [<813aaff0>] psr: 60000013 sp : df9e9d30 ip : df9e9d30 fp : df9e9d54 r10: 82b16f00 r9 : 00000003 r8 : 8424e000 r7 : df9e9d90 r6 : 8424e000 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15444 r1 : 00000001 r0 : 813aac70 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85a4e480 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 8424e000 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 8424e000 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 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf9e8000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.8969 (pid: 3695, stack limit = 0xdf9e8000) Stack: (0xdf9e9d30 to 0xdf9ea000) 9d20: df9e9d4c df9e9d40 829cf8ec 829cf8ec 9d40: 81e15904 8424e044 df9e9d8c df9e9d58 813a7098 813aae98 200000c0 00000000 9d60: df9e9d7c 200000c0 8424e000 b5403587 200000c0 85e7ec00 40946400 00000003 9d80: df9e9e4c df9e9d90 813a2c18 813a6f9c 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f27 00000000 00000004 00000004 00000005 00000005 00000004 9dc0: 00000007 54c6cff3 000000fd 00000002 00000001 00000001 00000001 00000006 9de0: 00000101 00000000 0000027f 00000003 40000003 00000089 0000caa3 00000000 9e00: 20001e5b 00000003 00000e66 00000004 00000008 00004086 00000000 fffffff8 9e20: 00000000 15c50587 00000000 855af900 8424e000 200000c0 200000c0 85e7ec00 9e40: df9e9f14 df9e9e50 813a3be4 813a2b24 00000000 df9e9e54 df9e9e54 15c50587 9e60: 00000000 00000000 8247054c 0000005f 83ddee58 8424e030 84208b94 85e7ec00 9e80: df9e9ee4 df9e9e90 8079794c 8078dcb0 00000064 00000001 00000000 df9e9eac 9ea0: 8573dd90 8342e330 00006400 0000000b df9e9ea0 00000000 df9e9d30 15c50587 9ec0: 855af900 40946400 200000c0 200000c0 855af900 00000003 df9e9ef4 df9e9ee8 9ee0: 80797a6c 15c50587 df9e9f14 40946400 00000000 855af901 200000c0 855af900 9f00: 00000003 85e7ec00 df9e9fa4 df9e9f18 8056cf08 813a3614 ecac8b10 85e7ec00 9f20: df9e9f3c df9e9f30 81a388b8 81a38788 df9e9f54 df9e9f40 8025e490 8028ef8c 9f40: df9e9fb0 40000000 df9e9f84 df9e9f58 802229ec 8025e44c 00000000 8281cddc 9f60: df9e9fb0 0014c820 ecac8b10 80222940 00000000 15c50587 df9e9fac 00000000 9f80: 00000000 002f6308 00000036 8020029c 85e7ec00 00000036 00000000 df9e9fa8 9fa0: 80200060 8056cde4 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fc30bc 9fe0: 76fc2ec0 76fc2eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aae8c>] (parport_attach) from [<813a7098>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:8424e044 r5:81e15904 r4:829cf8ec [<813a6f90>] (comedi_device_attach) from [<813a2c18>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85e7ec00 r7:200000c0 r6:b5403587 r5:8424e000 r4:200000c0 [<813a2b18>] (do_devconfig_ioctl) from [<813a3be4>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85e7ec00 r7:200000c0 r6:200000c0 r5:8424e000 r4:855af900 [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3608>] (comedi_unlocked_ioctl) from [<8056cf08>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85e7ec00 r9:00000003 r8:855af900 r7:200000c0 r6:855af901 r5:00000000 r4:40946400 [<8056cdd8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9e9fa8 to 0xdf9e9ff0) 9fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 9fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fc30bc 9fe0: 76fc2ec0 76fc2eb0 0001948c 001322c0 r10:00000036 r9:85e7ec00 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