8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f2a when write [fee04f2a] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 21251 Comm: syz.1.6651 Not tainted 6.17.0-rc2-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 : [<813ab460>] lr : [<813ab450>] psr: 60000013 sp : df881d30 ip : df881d30 fp : df881d54 r10: 82b16f00 r9 : 00000003 r8 : 841986c0 r7 : df881d90 r6 : 841986c0 r5 : 00000000 r4 : 00000000 r3 : fee04f2a r2 : 81e15464 r1 : 00000001 r0 : 813ab0d0 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84c0c0c0 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 841986c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf880000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841986c0 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 0xdf880000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf880000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.6651 (pid: 21251, stack limit = 0xdf880000) Stack: (0xdf881d30 to 0xdf882000) 1d20: 823fe3b8 841986c0 829cf92c 829cf92c 1d40: 81e15924 84198704 df881d8c df881d58 813a74f8 813ab2f8 200000c0 00000000 1d60: df881d7c 200000c0 841986c0 b5403587 200000c0 856c3000 40946400 00000003 1d80: df881e4c df881d90 813a3078 813a73fc 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f2a 0000801f 00010000 00000004 00000003 00000006 00000004 1dc0: 00080008 0000000e 00000006 00000002 00000001 00000001 00000001 0000009b 1de0: 10000105 00000009 0001a44d 00000003 3fff7fff 10000089 00000010 00000001 1e00: 20001e58 fffff801 00000e69 0000003c 00000008 00000006 00000000 fffffff8 1e20: 00000000 fa780828 00000000 848ea180 841986c0 200000c0 200000c0 856c3000 1e40: df881f14 df881e50 813a4044 813a2f84 00000000 00000000 00000000 fa780828 1e60: 00000000 00000000 8247054c 0000005f 83d30658 841986f0 841ccabc 856c3000 1e80: df881ee4 df881e90 807977b4 8078db18 00000064 00000001 00000000 df881eac 1ea0: 8497e310 834ee908 00006400 0000000b df881ea0 00000000 00000000 fa780828 1ec0: 848ea180 40946400 200000c0 200000c0 848ea180 00000003 df881ef4 df881ee8 1ee0: 807978d4 fa780828 df881f14 40946400 00000000 848ea181 200000c0 848ea180 1f00: 00000003 856c3000 df881fa4 df881f18 8056cd88 813a3a74 ecac8b10 856c3000 1f20: df881f3c df881f30 81a392b8 81a39188 df881f54 df881f40 8025e490 8028ef8c 1f40: df881fb0 40000000 df881f84 df881f58 802229ec 8025e44c 00000000 8281cddc 1f60: df881fb0 0014c820 ecac8b10 80222940 00000000 fa780828 df881fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 856c3000 00000036 00000000 df881fa8 1fa0: 80200060 8056cc64 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fd00bc 1fe0: 76fcfec0 76fcfeb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813ab2ec>] (parport_attach) from [<813a74f8>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:84198704 r5:81e15924 r4:829cf92c [<813a73f0>] (comedi_device_attach) from [<813a3078>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:856c3000 r7:200000c0 r6:b5403587 r5:841986c0 r4:200000c0 [<813a2f78>] (do_devconfig_ioctl) from [<813a4044>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:856c3000 r7:200000c0 r6:200000c0 r5:841986c0 r4:848ea180 [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3a68>] (comedi_unlocked_ioctl) from [<8056cd88>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:856c3000 r9:00000003 r8:848ea180 r7:200000c0 r6:848ea181 r5:00000000 r4:40946400 [<8056cc58>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf881fa8 to 0xdf881ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fd00bc 1fe0: 76fcfec0 76fcfeb0 0001948c 001322c0 r10:00000036 r9:856c3000 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