8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f29 when write [fee04f29] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 4441 Comm: syz.2.67 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 : [<813abca0>] lr : [<813abc90>] psr: 60000013 sp : dfd55d30 ip : dfd55d30 fp : dfd55d54 r10: 82b16f40 r9 : 00000003 r8 : 83e9ac00 r7 : dfd55d90 r6 : 83e9ac00 r5 : 00000000 r4 : 00000000 r3 : fee04f29 r2 : 81e15484 r1 : 00000001 r0 : 813ab910 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85f4ea80 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 83e9ac00 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfd54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83e9ac00 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 0xdfd54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfd54000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.2.67 (pid: 4441, stack limit = 0xdfd54000) Stack: (0xdfd55d30 to 0xdfd56000) 5d20: 823fe6c8 83e9ac00 829cf9ac 829cf9ac 5d40: 81e15944 83e9ac44 dfd55d8c dfd55d58 813a7d3c 813abb38 20000280 00000000 5d60: dfd55d7c 20000280 83e9ac00 b5403587 20000280 85983c00 40946400 00000003 5d80: dfd55e4c dfd55d90 813a3888 813a7c40 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f29 00000005 000003ff 00000601 00000001 00000cc7 00000fff 5dc0: 5c952399 00000805 000007ff 00000002 00000001 00000002 00000004 00000001 5de0: 00000000 00000005 0001a44b 00000003 00000201 00000be8 fffffff9 00000009 5e00: 20001e56 00000009 02000003 0000003c 00000008 00000004 08000000 00000001 5e20: 00000000 2f481b4b 00000000 85473e40 83e9ac00 20000280 20000280 85983c00 5e40: dfd55f14 dfd55e50 813a4854 813a3794 00000000 00000000 00000000 2f481b4b 5e60: 00000000 00000000 8247054c 0000005f 83f28458 83e9ac30 8427487c 85983c00 5e80: dfd55ee4 dfd55e90 80797aa4 8078de08 00000064 00000001 00000000 dfd55eac 5ea0: 85ec09d0 8342f088 00006400 0000000b dfd55ea0 00000000 00000000 2f481b4b 5ec0: 85473e40 40946400 20000280 20000280 85473e40 00000003 dfd55ef4 dfd55ee8 5ee0: 80797bc4 2f481b4b dfd55f14 40946400 00000000 85473e41 20000280 85473e40 5f00: 00000003 85983c00 dfd55fa4 dfd55f18 8056cdc8 813a4284 ecac8b10 85983c00 5f20: dfd55f3c dfd55f30 81a39db8 81a39c88 dfd55f54 dfd55f40 8025e490 8028ef6c 5f40: dfd55fb0 40000000 dfd55f84 dfd55f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfd55fb0 0014c820 ecac8b10 80222940 00000000 2f481b4b dfd55fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 85983c00 00000036 00000000 dfd55fa8 5fa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76ff50bc 5fe0: 76ff4ec0 76ff4eb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813abb2c>] (parport_attach) from [<813a7d3c>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83e9ac44 r5:81e15944 r4:829cf9ac [<813a7c34>] (comedi_device_attach) from [<813a3888>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:85983c00 r7:20000280 r6:b5403587 r5:83e9ac00 r4:20000280 [<813a3788>] (do_devconfig_ioctl) from [<813a4854>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:85983c00 r7:20000280 r6:20000280 r5:83e9ac00 r4:85473e40 [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4278>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:85983c00 r9:00000003 r8:85473e40 r7:20000280 r6:85473e41 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd55fa8 to 0xdfd55ff0) 5fa0: 00000000 00000000 00000003 40946400 20000280 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76ff50bc 5fe0: 76ff4ec0 76ff4eb0 0001948c 001322c0 r10:00000036 r9:85983c00 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