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: 0 UID: 0 PID: 5333 Comm: syz.1.328 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 : [<813abcd0>] lr : [<813abcc0>] psr: 60000013 sp : dfa2dd30 ip : dfa2dd30 fp : dfa2dd54 r10: 82b16f40 r9 : 00000003 r8 : 84196e40 r7 : dfa2dd90 r6 : 84196e40 r5 : 00000000 r4 : 00000000 r3 : fee04f27 r2 : 81e15484 r1 : 00000001 r0 : 813ab940 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 859ae240 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 84196e40 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r8 information: slab kmalloc-192 start 84196e40 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 0xdfa2c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Register r12 information: 2-page vmalloc region starting at 0xdfa2c000 allocated at kernel_clone+0xac/0x3ec kernel/fork.c:2605 Process syz.1.328 (pid: 5333, stack limit = 0xdfa2c000) Stack: (0xdfa2dd30 to 0xdfa2e000) dd20: dfa2dd4c dfa2dd40 829cf9ac 829cf9ac dd40: 81e15944 84196e84 dfa2dd8c dfa2dd58 813a7d68 813abb68 200000c0 00000000 dd60: dfa2dd7c 200000c0 84196e40 b5403587 200000c0 8524ec00 40946400 00000003 dd80: dfa2de4c dfa2dd90 813a38b4 813a7c6c 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00004f27 00000000 00000008 00000006 00000005 00000005 00000009 ddc0: 00000007 54c6cff3 000000fd 00000002 00008401 00000006 5da31c5d 00000006 dde0: 00000101 00000000 00000892 0000a418 40000001 00000005 0000caa3 00000008 de00: 20001e5b 00000000 00000e66 00000004 00000008 00000005 00000000 fffffff8 de20: 00000000 0e24eba0 00000000 85aa3840 84196e40 200000c0 200000c0 8524ec00 de40: dfa2df14 dfa2de50 813a4880 813a37c0 00000000 00000000 00000000 0e24eba0 de60: 00000000 00000000 8247054c 0000005f 83c04c58 84196e70 841d15f4 8524ec00 de80: dfa2dee4 dfa2de90 80797aa4 8078de08 00000064 00000001 00000000 dfa2deac dea0: 85337250 83430770 00006400 0000000b dfa2dea0 00000000 00000000 0e24eba0 dec0: 85aa3840 40946400 200000c0 200000c0 85aa3840 00000006 dfa2def4 dfa2dee8 dee0: 80797bc4 0e24eba0 dfa2df14 40946400 00000000 85aa3841 200000c0 85aa3840 df00: 00000006 8524ec00 dfa2dfa4 dfa2df18 8056cdc8 813a42b0 ecac8b10 8524ec00 df20: dfa2df3c dfa2df30 81a39df8 81a39cc8 dfa2df54 dfa2df40 8025e490 8028ef6c df40: dfa2dfb0 40000000 dfa2df84 dfa2df58 802229ec 8025e44c 00000000 8281cddc df60: dfa2dfb0 0014c820 ecac8b10 80222940 00000000 0e24eba0 dfa2dfac 00000000 df80: 00000000 002f6448 00000036 8020029c 8524ec00 00000036 00000000 dfa2dfa8 dfa0: 80200060 8056cca4 00000000 00000000 00000006 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76f230bc dfe0: 76f22ec0 76f22eb0 0001948c 001322c0 60000010 00000006 00000000 00000000 Call trace: [<813abb5c>] (parport_attach) from [<813a7d68>] (comedi_device_attach+0x108/0x250 drivers/comedi/drivers.c:1007) r6:84196e84 r5:81e15944 r4:829cf9ac [<813a7c60>] (comedi_device_attach) from [<813a38b4>] (do_devconfig_ioctl+0x100/0x220 drivers/comedi/comedi_fops.c:872) r10:00000003 r9:40946400 r8:8524ec00 r7:200000c0 r6:b5403587 r5:84196e40 r4:200000c0 [<813a37b4>] (do_devconfig_ioctl) from [<813a4880>] (comedi_unlocked_ioctl+0x5dc/0x1c50 drivers/comedi/comedi_fops.c:2178) r8:8524ec00 r7:200000c0 r6:200000c0 r5:84196e40 r4:85aa3840 [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<813a42a4>] (comedi_unlocked_ioctl) from [<8056cdc8>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:8524ec00 r9:00000006 r8:85aa3840 r7:200000c0 r6:85aa3841 r5:00000000 r4:40946400 [<8056cc98>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa2dfa8 to 0xdfa2dff0) dfa0: 00000000 00000000 00000006 40946400 200000c0 00000000 dfc0: 00000000 00000000 002f6448 00000036 002e0000 00000000 00006364 76f230bc dfe0: 76f22ec0 76f22eb0 0001948c 001322c0 r10:00000036 r9:8524ec00 r8:8020029c r7:00000036 r6:002f6448 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