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: 6802 Comm: syz.0.553 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 : [<813abc98>] lr : [<813abc88>] psr: 60000013 sp : dfac5d30 ip : dfac5d30 fp : dfac5d54 r10: 82b16f40 r9 : 00000003 r8 : 83e326c0 r7 : dfac5d90 r6 : 83e326c0 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15484 r1 : 00000001 r0 : 813ab908 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 85fb5400 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 83e326c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 83e326c0 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 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfac4000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.0.553 (pid: 6802, stack limit = 0xdfac4000) Stack: (0xdfac5d30 to 0xdfac6000) 5d20: dfac5d4c dfac5d40 829cf9ac 829cf9ac 5d40: 81e15944 83e32704 dfac5d8c dfac5d58 813a7d34 813abb30 200000c0 00000000 5d60: dfac5d7c 200000c0 83e326c0 b5403587 200000c0 858c0c00 40946400 00000003 5d80: dfac5e4c dfac5d90 813a3880 813a7c38 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f27 00000000 00000004 00000007 00000005 00000005 00000004 5dc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000001 00000001 00000006 5de0: 00000101 00000000 0000007f 00000007 40000001 0000000d 0000caa3 00000000 5e00: 20001e5b 00000000 00000e66 00000003 00000008 00004086 00000000 fffffff8 5e20: 00000000 82db69a1 00000000 8627be40 83e326c0 200000c0 200000c0 858c0c00 5e40: dfac5f14 dfac5e50 813a484c 813a378c 00000000 00000000 00000000 82db69a1 5e60: 00000000 00000000 8247054c 0000005f 83dde258 83e326f0 8418309c 858c0c00 5e80: dfac5ee4 dfac5e90 80797aa4 8078de08 00000064 00000001 00000000 dfac5eac 5ea0: 85dc6190 83421a18 00006400 0000000b dfac5ea0 00000000 00000000 82db69a1 5ec0: 8627be40 40946400 200000c0 200000c0 8627be40 00000003 dfac5ef4 dfac5ee8 5ee0: 80797bc4 82db69a1 dfac5f14 40946400 00000000 8627be41 200000c0 8627be40 5f00: 00000003 858c0c00 dfac5fa4 dfac5f18 8056cdc8 813a427c ecac8b10 858c0c00 5f20: dfac5f3c dfac5f30 81a39db8 81a39c88 dfac5f54 dfac5f40 8025e490 8028ef6c 5f40: dfac5fb0 40000000 dfac5f84 dfac5f58 802229ec 8025e44c 00000000 8281cddc 5f60: dfac5fb0 0014c820 ecac8b10 80222940 00000000 82db69a1 dfac5fac 00000000 5f80: 00000000 002f6308 00000036 8020029c 858c0c00 00000036 00000000 dfac5fa8 5fa0: 80200060 8056cca4 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f4f0bc 5fe0: 76f4eec0 76f4eeb0 0001948c 001322c0 60000010 00000003 00000000 00000000 Call trace: [<813abb24>] (parport_attach) from [<813a7d34>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:83e32704 r5:81e15944 r4:829cf9ac [<813a7c2c>] (comedi_device_attach) from [<813a3880>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:858c0c00 r7:200000c0 r6:b5403587 r5:83e326c0 r4:200000c0 [<813a3780>] (do_devconfig_ioctl) from [<813a484c>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:858c0c00 r7:200000c0 r6:200000c0 r5:83e326c0 r4:8627be40 [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a4270>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:858c0c00 r9:00000003 r8:8627be40 r7:200000c0 r6:8627be41 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfac5fa8 to 0xdfac5ff0) 5fa0: 00000000 00000000 00000003 40946400 200000c0 00000000 5fc0: 00000000 00000000 002f6308 00000036 002e0000 00000000 00006364 76f4f0bc 5fe0: 76f4eec0 76f4eeb0 0001948c 001322c0 r10:00000036 r9:858c0c00 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