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: 12358 Comm: syz.9.1554 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 : [<813aaaf8>] lr : [<813aaae8>] psr: 60000013 sp : df9d1d30 ip : df9d1d30 fp : df9d1d54 r10: 82b16f00 r9 : 00000003 r8 : 841033c0 r7 : df9d1d90 r6 : 841033c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15424 r1 : 00000001 r0 : 813aa768 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 8595cbc0 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 841033c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdf9d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 841033c0 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 0xdf9d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdf9d0000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.9.1554 (pid: 12358, stack limit = 0xdf9d0000) Stack: (0xdf9d1d30 to 0xdf9d2000) 1d20: 823fe2a8 841033c0 829cf8ec 829cf8ec 1d40: 81e158e4 84103404 df9d1d8c df9d1d58 813a6b90 813aa990 200000c0 00000000 1d60: df9d1d7c 200000c0 841033c0 b5403587 200000c0 85486000 40946400 00000003 1d80: df9d1e4c df9d1d90 813a2710 813a6a94 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00004f27 00000002 00000004 00000006 00000005 00000005 00000004 1dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 1de0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000000 1e00: 20001e5b 00000000 00000e66 00000004 00000008 00004086 00000000 fffffff8 1e20: 00000000 693ff9f0 00000000 85833900 841033c0 200000c0 200000c0 85486000 1e40: df9d1f14 df9d1e50 813a36dc 813a261c 00000000 00000000 00000000 693ff9f0 1e60: 00000000 00000000 8247054c 0000005f 83feee58 841033f0 8419ec6c 85486000 1e80: df9d1ee4 df9d1e90 80797804 8078db68 00000064 00000001 00000000 df9d1eac 1ea0: 85c49850 834e8b28 00006400 0000000b df9d1ea0 00000000 00000000 693ff9f0 1ec0: 85833900 40946400 200000c0 200000c0 85833900 00000003 df9d1ef4 df9d1ee8 1ee0: 80797924 693ff9f0 df9d1f14 40946400 00000000 85833901 200000c0 85833900 1f00: 00000003 85486000 df9d1fa4 df9d1f18 8056ce5c 813a310c ecac8b10 85486000 1f20: df9d1f3c df9d1f30 81a382f8 81a381c8 df9d1f54 df9d1f40 8025e490 8028ef8c 1f40: df9d1fb0 40000000 df9d1f84 df9d1f58 802229ec 8025e44c 00000000 8281cddc 1f60: df9d1fb0 0014c820 ecac8b10 80222940 00000000 693ff9f0 df9d1fac 00000000 1f80: 00000000 002f6308 00000036 8020029c 85486000 00000036 00000000 df9d1fa8 1fa0: 80200060 8056cd38 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fbd0bc 1fe0: 76fbcec0 76fbceb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813aa984>] (parport_attach) from [<813a6b90>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1006) r6:84103404 r5:81e158e4 r4:829cf8ec [<813a6a88>] (comedi_device_attach) from [<813a2710>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85486000 r7:200000c0 r6:b5403587 r5:841033c0 r4:200000c0 [<813a2610>] (do_devconfig_ioctl) from [<813a36dc>] (comedi_unlocked_ioctl+0x5dc/0x1c24 drivers/comedi/comedi_fops.c:2173) r8:85486000 r7:200000c0 r6:200000c0 r5:841033c0 r4:85833900 [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a3100>] (comedi_unlocked_ioctl) from [<8056ce5c>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85486000 r9:00000003 r8:85833900 r7:200000c0 r6:85833901 r5:00000000 r4:40946400 [<8056cd2c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9d1fa8 to 0xdf9d1ff0) 1fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 1fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76fbd0bc 1fe0: 76fbcec0 76fbceb0 0001948c 001322c0 r10:00000036 r9:85486000 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