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: 11135 Comm: syz.1.1395 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 : e0319d30 ip : e0319d30 fp : e0319d54 r10: 82b28b30 r9 : 00000003 r8 : 84433840 r7 : e0319d90 r6 : 84433840 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: 8522e9c0 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 84433840 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xe0318000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r8 information: slab kmalloc-192 start 84433840 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 0xe0318000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Register r12 information: 2-page vmalloc region starting at 0xe0318000 allocated at kernel_clone+0xac/0x3f4 kernel/fork.c:2651 Process syz.1.1395 (pid: 11135, stack limit = 0xe0318000) Stack: (0xe0319d30 to 0xe031a000) 9d20: 8243d05c 84433840 829d3948 829d3948 9d40: 81e25404 00000000 e0319d8c e0319d58 813fca58 81400cc4 40946400 00000000 9d60: e0319d7c 20002740 84433840 b5403587 40946400 85b3b000 00000003 84433870 9d80: e0319e4c e0319d90 813f8388 813fc958 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00004f07 00000005 00000002 00010001 0000483c 01100cc1 00000004 9dc0: 00000006 00000006 0000e8aa 00000002 00000008 ffffbffd 00000006 00000005 9de0: 00000a10 0000000e 0001a448 000003ff 40000005 00200099 00000004 00000000 9e00: 20001e57 00000007 00000729 0000003d 00000007 00000002 00000001 00000fce 9e20: 00000000 6bfe5466 00000000 85108b40 84433840 20002740 40946400 85b3b000 9e40: e0319f14 e0319e50 813f8f08 813f82c0 00000000 6bfe5466 00000000 00000000 9e60: 824b15ec e0319ea4 0000005f 8328f600 00000064 8443b51c e0319ee4 e0319e88 9e80: 807b404c 807aa6c8 00000064 00000001 00000000 e0319ea4 85eac850 8342a770 9ea0: 00006400 0000000b e0319e98 00000000 00000000 6bfe5466 00000000 85108b40 9ec0: 40946400 20002740 20002740 85108b40 00000003 85b3b000 e0319ef4 e0319ee8 9ee0: 807b417c 6bfe5466 e0319f14 00000000 85108b41 40946400 20002740 85108b40 9f00: 00000003 85b3b000 e0319fa4 e0319f18 8058223c 813f8e10 ecac8b10 85b3b000 9f20: e0319f3c e0319f30 81aa6818 81aa66e8 e0319f54 e0319f40 8025ba7c 8028ef68 9f40: e0319fb0 40000000 e0319f84 e0319f58 80221a54 8025ba38 00000000 8281cf7c 9f60: e0319fb0 0013ddc0 ecac8b10 802219a8 00000000 6bfe5466 e0319fac 00000000 9f80: 00000000 00346310 00000036 8020029c 85b3b000 00000036 00000000 e0319fa8 9fa0: 80200060 80582004 00000000 00000000 00000003 40946400 20002740 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff30dc 9fe0: 76ff2e88 76ff2e78 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) r10:84433870 r9:00000003 r8:85b3b000 r7:40946400 r6:b5403587 r5:84433840 r4:20002740 [<813f82b4>] (do_devconfig_ioctl) from [<813f8f08>] (comedi_unlocked_ioctl+0x104/0x1c88 drivers/comedi/comedi_fops.c:2240) r8:85b3b000 r7:40946400 r6:20002740 r5:84433840 r4:85108b40 [<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) r10:85b3b000 r9:00000003 r8:85108b40 r7:20002740 r6:40946400 r5:85108b41 r4:00000000 [<80581ff8>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xe0319fa8 to 0xe0319ff0) 9fa0: 00000000 00000000 00000003 40946400 20002740 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76ff30dc 9fe0: 76ff2e88 76ff2e78 00018734 0012fc20 r10:00000036 r9:85b3b000 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