8<--- cut here --- Unable to handle kernel paging request at virtual address fee00033 when write [fee00033] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 12167 Comm: syz.5.1619 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP 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 : [<81401274>] lr : [<81401264>] psr: 60000013 sp : dfb3dd30 ip : dfb3dd30 fp : dfb3dd54 r10: 82b29b30 r9 : 00000003 r8 : 843e3cc0 r7 : dfb3dd90 r6 : 843e3cc0 r5 : 00000000 r4 : 00000000 r3 : fee00033 r2 : 81e24f44 r1 : 00000001 r0 : 81400ee4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 855aac80 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 843e3cc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfb3c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 843e3cc0 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 0xdfb3c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfb3c000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.5.1619 (pid: 12167, stack limit = 0xdfb3c000) Stack: (0xdfb3dd30 to 0xdfb3e000) dd20: 8243d12c 843e3cc0 829d4280 829d4280 dd40: 81e25404 00000000 dfb3dd8c dfb3dd58 813fcea0 8140110c 40946400 00000000 dd60: dfb3dd7c 200000c0 843e3cc0 b5403587 40946400 85d1ec00 00000003 843e3cf0 dd80: dfb3de4c dfb3dd90 813f87d8 813fcda0 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000033 00000003 00000000 00000010 00000004 00000cc7 000000df ddc0: 00000007 00000009 000003ff 08000800 0000bc20 00000001 00000006 0000f069 dde0: 00000000 00000009 00200000 fffffff4 00000002 00000000 fffffffd fffffffd de00: fffffff5 ffffeadb 00000003 000007ff 8000000b 00004000 08000000 00000004 de20: 00000000 d6a80035 00000000 84b09600 843e3cc0 200000c0 40946400 85d1ec00 de40: dfb3df14 dfb3de50 813f9358 813f8710 00000000 d6a80035 00000000 00000000 de60: 824b15ec dfb3dea4 0000005f 840817f8 00000064 8453175c dfb3dee4 dfb3de88 de80: 807b3fb4 807aa630 00000064 00000001 00000000 dfb3dea4 84d153d0 8342bcc0 dea0: 00006400 0000000b dfb3de98 00000000 00000000 d6a80035 00000000 84b09600 dec0: 40946400 200000c0 200000c0 84b09600 00000003 85d1ec00 dfb3def4 dfb3dee8 dee0: 807b40e4 d6a80035 dfb3df14 00000000 84b09601 40946400 200000c0 84b09600 df00: 00000003 85d1ec00 dfb3dfa4 dfb3df18 805821a4 813f9260 ecac8b10 85d1ec00 df20: dfb3df3c dfb3df30 81aa6d38 81aa6c08 dfb3df54 dfb3df40 8025ba7c 8028ef68 df40: dfb3dfb0 40000000 dfb3df84 dfb3df58 80221a54 8025ba38 00000000 8281cf7c df60: dfb3dfb0 0013ddc0 ecac8b10 802219a8 00000000 d6a80035 dfb3dfac 00000000 df80: 00000000 00346310 00000036 8020029c 85d1ec00 00000036 00000000 dfb3dfa8 dfa0: 80200060 80581f6c 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f970dc dfe0: 76f96e88 76f96e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81401100>] (parport_attach) from [<813fcea0>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d4280 [<813fcd94>] (comedi_device_attach) from [<813f87d8>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:843e3cf0 r9:00000003 r8:85d1ec00 r7:40946400 r6:b5403587 r5:843e3cc0 r4:200000c0 [<813f8704>] (do_devconfig_ioctl) from [<813f9358>] (comedi_unlocked_ioctl+0x104/0x1c80 drivers/comedi/comedi_fops.c:2240) r8:85d1ec00 r7:40946400 r6:200000c0 r5:843e3cc0 r4:84b09600 [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f9254>] (comedi_unlocked_ioctl) from [<805821a4>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:85d1ec00 r9:00000003 r8:84b09600 r7:200000c0 r6:40946400 r5:84b09601 r4:00000000 [<80581f60>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfb3dfa8 to 0xdfb3dff0) dfa0: 00000000 00000000 00000003 40946400 200000c0 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f970dc dfe0: 76f96e88 76f96e78 00018734 0012fc20 r10:00000036 r9:85d1ec00 r8:8020029c r7:00000036 r6:00346310 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