8<--- cut here --- Unable to handle kernel paging request at virtual address fee04f07 when write [fee04f07] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 14062 Comm: syz.5.2142 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 : [<81400e2c>] lr : [<81400e1c>] psr: 60000013 sp : dfa45d30 ip : dfa45d30 fp : dfa45d54 r10: 82b28b30 r9 : 00000003 r8 : 845326c0 r7 : dfa45d90 r6 : 845326c0 r5 : 00000000 r4 : 00000000 r3 : fee04f07 r2 : 81e24f44 r1 : 00000001 r0 : 81400a9c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 90631040 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 845326c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 845326c0 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 0xdfa44000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xdfa44000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.5.2142 (pid: 14062, stack limit = 0xdfa44000) Stack: (0xdfa45d30 to 0xdfa46000) 5d20: 8243d05c 845326c0 829d3948 829d3948 5d40: 81e25404 00000000 dfa45d8c dfa45d58 813fca58 81400cc4 40946400 00000000 5d60: dfa45d7c 20002740 845326c0 b5403587 40946400 84d32400 00000003 845326f0 5d80: dfa45e4c dfa45d90 813f8388 813fc958 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00004f07 00000005 00000002 00010001 0000483c 01100cc1 00000004 5dc0: 00000006 00000006 0000e8aa 00000002 00000008 ffffbffd 00000006 00000005 5de0: 00000a10 0000000e 0001a448 000003ff 40000005 00200099 00000004 00000000 5e00: 20001e57 00000007 00000729 0000003d 00000007 00000002 00000001 00000fce 5e20: 00000000 e522cb26 00000000 85ef4780 845326c0 20002740 40946400 84d32400 5e40: dfa45f14 dfa45e50 813f8f08 813f82c0 00000000 e522cb26 00000000 00000000 5e60: 824b15ec dfa45ea4 0000005f 844c9210 00000064 8455f294 dfa45ee4 dfa45e88 5e80: 807b404c 807aa6c8 00000064 00000001 00000000 dfa45ea4 86637f10 83415550 5ea0: 00006400 0000000b dfa45e98 00000000 00000000 e522cb26 00000000 85ef4780 5ec0: 40946400 20002740 20002740 85ef4780 00000003 84d32400 dfa45ef4 dfa45ee8 5ee0: 807b417c e522cb26 dfa45f14 00000000 85ef4781 40946400 20002740 85ef4780 5f00: 00000003 84d32400 dfa45fa4 dfa45f18 8058223c 813f8e10 ecac8b10 84d32400 5f20: dfa45f3c dfa45f30 81aa6818 81aa66e8 dfa45f54 dfa45f40 8025ba7c 8028ef68 5f40: dfa45fb0 40000000 dfa45f84 dfa45f58 80221a54 8025ba38 00000000 8281cf7c 5f60: dfa45fb0 0013ddc0 ecac8b10 802219a8 00000000 e522cb26 dfa45fac 00000000 5f80: 00000000 00346310 00000036 8020029c 84d32400 00000036 00000000 dfa45fa8 5fa0: 80200060 80582004 00000000 00000000 00000003 40946400 20002740 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff20dc 5fe0: 76ff1e88 76ff1e78 00018734 0012fc20 60000010 00000003 00000000 00000000 Call trace: [<81400cb8>] (parport_attach) from [<813fca58>] (comedi_device_attach+0x10c/0x248 drivers/comedi/drivers.c:1069) r6:00000000 r5:81e25404 r4:829d3948 [<813fc94c>] (comedi_device_attach) from [<813f8388>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:928) r10:845326f0 r9:00000003 r8:84d32400 r7:40946400 r6:b5403587 r5:845326c0 r4:20002740 [<813f82b4>] (do_devconfig_ioctl) from [<813f8f08>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:84d32400 r7:40946400 r6:20002740 r5:845326c0 r4:85ef4780 [<813f8e04>] (comedi_unlocked_ioctl) from [<8058223c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<813f8e04>] (comedi_unlocked_ioctl) from [<8058223c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<813f8e04>] (comedi_unlocked_ioctl) from [<8058223c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<813f8e04>] (comedi_unlocked_ioctl) from [<8058223c>] (sys_ioctl+0x244/0xb58 fs/ioctl.c:583) r10:84d32400 r9:00000003 r8:85ef4780 r7:20002740 r6:40946400 r5:85ef4781 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfa45fa8 to 0xdfa45ff0) 5fa0: 00000000 00000000 00000003 40946400 20002740 00000000 5fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff20dc 5fe0: 76ff1e88 76ff1e78 00018734 0012fc20 r10:00000036 r9:84d32400 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