8<--- cut here --- Unable to handle kernel paging request at virtual address fee00078 when write [fee00078] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 14035 Comm: syz.1.2828 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:291 [inline] PC is at parport_attach+0x184/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:291 [inline] LR is at parport_attach+0x174/0x1e0 drivers/comedi/drivers/comedi_parport.c:224 pc : [<81458564>] lr : [<81458554>] psr: 60000013 sp : dfd71d30 ip : dfd71d30 fp : dfd71d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8301b3c0 r7 : dfd71d90 r6 : 8301b3c0 r5 : 00000000 r4 : 00000000 r3 : fee00078 r2 : 81e27508 r1 : 00000001 r0 : 814581c4 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 85dcd6c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8301b3c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfd70000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301b3c0 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 0xdfd70000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xdfd70000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.1.2828 (pid: 14035, stack limit = 0xdfd70000) Stack: (0xdfd71d30 to 0xdfd72000) 1d20: ffffffff 00000004 00000000 82bd2aa0 1d40: 81e279c8 00000000 dfd71d8c dfd71d58 814540c4 814583ec 40946400 00000000 1d60: dfd71d7c 20000600 8301b3c0 b5403587 40946400 00000003 00000003 84000000 1d80: dfd71e4c dfd71d90 8144f8d0 81453fc8 656d6f63 705f6964 6f707261 00007472 1da0: 00000000 00000078 00000000 00000000 0000000c 00000008 00000006 00100002 1dc0: 00000007 00000005 00000100 00000004 00000001 00000001 00020003 00000000 1de0: 00000101 00000083 80000000 00000003 00001b18 00000016 00000004 00000000 1e00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 1e20: 00000000 87dea4be 00000000 86d03f80 8301b3c0 20000600 40946400 00000003 1e40: dfd71f14 dfd71e50 81450bf4 8144f808 dfd71e4c 87dea4be 00000000 00000000 1e60: 82530804 dfd71ea4 0000005f 847bab68 00000064 8301b3f0 dfd71ee4 dfd71e88 1e80: 807e94e8 807df7fc 00000064 00000001 00000000 dfd71ea4 833659d0 8341f2a8 1ea0: 00006400 0000000b dfd71e98 00000000 dfd71d38 87dea4be 00000000 86d03f80 1ec0: 40946400 20000600 20000600 86d03f80 00000003 84000000 dfd71ef4 dfd71ee8 1ee0: 807e961c 87dea4be dfd71f14 00000000 86d03f81 40946400 20000600 86d03f80 1f00: 00000003 84000000 dfd71fa4 dfd71f18 805a1864 814508ac ecac8b10 84000000 1f20: dfd71f3c dfd71f30 81b15f14 81b15de0 dfd71f54 dfd71f40 8025a69c 8028e1bc 1f40: dfd71fb0 40000000 dfd71f84 dfd71f58 80220be0 8025a658 00000000 82a1c63c 1f60: dfd71fb0 0013e9b0 ecac8b10 80220b34 00000000 87dea4be dfd71fac 00000000 1f80: 00000000 00346310 00000036 8020029c 84000000 00000036 00000000 dfd71fa8 1fa0: 80200060 805a162c 00000000 00000000 00000003 40946400 20000600 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd80dc 1fe0: 76fd7e88 76fd7e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<814583e0>] (parport_attach) from [<814540c4>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e279c8 r4:82bd2aa0 [<81453fbc>] (comedi_device_attach) from [<8144f8d0>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84000000 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301b3c0 r4:20000600 [<8144f7fc>] (do_devconfig_ioctl) from [<81450bf4>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8301b3c0 r4:86d03f80 [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<814508a0>] (comedi_unlocked_ioctl) from [<805a1864>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84000000 r9:00000003 r8:86d03f80 r7:20000600 r6:40946400 r5:86d03f81 r4:00000000 [<805a1620>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfd71fa8 to 0xdfd71ff0) 1fa0: 00000000 00000000 00000003 40946400 20000600 00000000 1fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76fd80dc 1fe0: 76fd7e88 76fd7e78 00018ebc 00130810 r10:00000036 r9:84000000 r8:8020029c r7:00000036 r6:00346310 r5:00000000 r4:00000000 Code: e5963064 e3a04000 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: e5963064 ldr r3, [r6, #100] @ 0x64 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