8<--- cut here --- Unable to handle kernel paging request at virtual address fee00100 when write [fee00100] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 1 UID: 0 PID: 7398 Comm: syz.2.881 Not tainted syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express PC is at __raw_writeb arch/arm/include/asm/io.h:99 [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 : [<814941b4>] lr : [<814941a4>] psr: 60000013 sp : dfba5d30 ip : dfba5d30 fp : dfba5d54 r10: 82d30dfc r9 : 00000003 r8 : 8301acc0 r7 : dfba5d90 r6 : 8301acc0 r5 : 00000000 r4 : 00000000 r3 : fee00100 r2 : 81e2dee8 r1 : 00000001 r0 : 81493e14 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 876a88c0 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:1048 Register r4 information: NULL pointer Register r5 information: NULL pointer Register r6 information: slab kmalloc-192 start 8301acc0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xdfba4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 8301acc0 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 0xdfba4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfba4000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.2.881 (pid: 7398, stack limit = 0xdfba4000) Stack: (0xdfba5d30 to 0xdfba6000) 5d20: 824d4be8 8301acc0 82bd8ea0 82bd8ea0 5d40: 81e2e3a8 00000000 dfba5d8c dfba5d58 8148fd30 8149403c 40946400 00000000 5d60: dfba5d7c 20000180 8301acc0 b5403587 40946400 00000003 00000003 83e455c0 5d80: dfba5e4c dfba5d90 8148b534 8148fc34 656d6f63 705f6964 6f707261 00007472 5da0: 00000000 00000100 0000000f 00000003 00000002 00000005 00000100 00000003 5dc0: 20000010 00000008 0000000b 00000005 00000007 00000001 00000401 00010001 5de0: 00000001 00000000 00000008 00000fe9 00000401 00000003 00000002 00000007 5e00: 00000009 00000048 00000009 00000007 00006a7a 00000003 00000007 00000008 5e20: 00000000 fca090cb 00000000 8675d900 8301acc0 20000180 40946400 00000003 5e40: dfba5f14 dfba5e50 8148c85c 8148b474 00000000 fca090cb 00000000 00000000 5e60: 8254980c dfba5ea4 0000005f 846d9dd8 00000064 8301acf0 dfba5ee4 dfba5e88 5e80: 808061a4 807fc85c 00000064 00000001 00000000 dfba5ea4 86522d10 83432110 5ea0: 00006400 0000000b dfba5e98 00000000 00000000 fca090cb 00000000 8675d900 5ec0: 40946400 20000180 20000180 8675d900 00000003 83e455c0 dfba5ef4 dfba5ee8 5ee0: 808062d8 fca090cb dfba5f14 00000000 8675d901 40946400 20000180 8675d900 5f00: 00000003 83e455c0 dfba5fa4 dfba5f18 805bae48 8148c514 ecac8b10 83e455c0 5f20: dfba5f3c dfba5f30 81b59920 81b597ec dfba5f54 dfba5f40 8025a7a8 8028e490 5f40: dfba5fb0 40000000 dfba5f84 dfba5f58 80220bdc 8025a764 00000000 82a1eb0c 5f60: dfba5fb0 0013ea70 ecac8b10 80220b30 00000000 fca090cb dfba5fac 00000000 5f80: 00000000 00356310 00000036 8020029c 83e455c0 00000036 00000000 dfba5fa8 5fa0: 80200060 805bac10 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2d0dc 5fe0: 76f2ce88 76f2ce78 00018ebc 001308d0 60000010 00000003 00000000 00000000 Call trace: [<81494030>] (parport_attach) from [<8148fd30>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e2e3a8 r4:82bd8ea0 [<8148fc28>] (comedi_device_attach) from [<8148b534>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83e455c0 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301acc0 r4:20000180 [<8148b468>] (do_devconfig_ioctl) from [<8148c85c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000180 r5:8301acc0 r4:8675d900 [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148c508>] (comedi_unlocked_ioctl) from [<805bae48>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e455c0 r9:00000003 r8:8675d900 r7:20000180 r6:40946400 r5:8675d901 r4:00000000 [<805bac04>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfba5fa8 to 0xdfba5ff0) 5fa0: 00000000 00000000 00000003 40946400 20000180 00000000 5fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f2d0dc 5fe0: 76f2ce88 76f2ce78 00018ebc 001308d0 r10:00000036 r9:83e455c0 r8:8020029c r7:00000036 r6:00356310 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