8<--- cut here --- Unable to handle kernel paging request at virtual address fee00140 when write [fee00140] *pgd=80000080007003, *pmd=00000000 Internal error: Oops: a06 [#1] SMP ARM Modules linked in: CPU: 0 UID: 0 PID: 23624 Comm: syz.3.10702 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:99 [inline] PC is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] PC is at parport_attach+0x5c/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 LR is at parport_attach drivers/comedi/drivers/comedi_parport.c:243 [inline] LR is at parport_attach+0x50/0x1e8 drivers/comedi/drivers/comedi_parport.c:231 pc : [<81494ec0>] lr : [<81494eb4>] psr: 60000013 sp : dfdd9d30 ip : dfdd9d30 fp : dfdd9d54 r10: 82d30dfc r9 : 00000003 r8 : 845ec000 r7 : dfdd9d90 r6 : dfdd9d90 r5 : 845ec000 r4 : 00000000 r3 : fee00140 r2 : 00000000 r1 : 00000000 r0 : 00000000 Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 8719d040 DAC: fffffffd Register r0 information: NULL pointer Register r1 information: NULL pointer Register r2 information: NULL pointer 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: slab kmalloc-192 start 845ec000 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfdd8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r7 information: 2-page vmalloc region starting at 0xdfdd8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r8 information: slab kmalloc-192 start 845ec000 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 0xdfdd8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Register r12 information: 2-page vmalloc region starting at 0xdfdd8000 allocated at kernel_clone+0xc4/0x43c kernel/fork.c:2748 Process syz.3.10702 (pid: 23624, stack limit = 0xdfdd8000) Stack: (0xdfdd9d30 to 0xdfdda000) 9d20: ffffffff 00000004 82bd8ea0 81e2e428 9d40: 00000000 dfdd9d90 dfdd9d8c dfdd9d58 81490b50 81494e70 40946400 00000000 9d60: dfdd9d7c 200003c0 845ec000 b5403587 40946400 00000002 00000003 83e4a4c0 9d80: dfdd9e4c dfdd9d90 8148c354 81490a54 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000140 00000003 0001000c 0000dddc 00000000 00010000 00007fff 9dc0: 00000000 00000007 0000c72c 02000004 0000000f 0000c000 00000008 000004ce 9de0: 00008e99 00000001 000000ed 00000006 00000008 00000004 00000000 0000000a 9e00: 00000009 00000ffb 00000009 000000af 00000002 00000283 00008001 00000009 9e20: 00000000 1b9ad9b3 00000000 898ca900 845ec000 200003c0 40946400 00000002 9e40: dfdd9f14 dfdd9e50 8148d67c 8148c294 00000000 1b9ad9b3 00000000 00000000 9e60: 82549844 dfdd9ea4 0000005f 84161a28 00000064 845ec030 dfdd9ee4 dfdd9e88 9e80: 8080664c 807fcd04 00000064 00000001 00000000 dfdd9ea4 88a17510 834dae58 9ea0: 00006400 0000000b dfdd9e98 00000000 00000000 1b9ad9b3 00000000 898ca900 9ec0: 40946400 200003c0 200003c0 898ca900 00000003 83e4a4c0 dfdd9ef4 dfdd9ee8 9ee0: 80806780 1b9ad9b3 dfdd9f14 00000000 898ca901 40946400 200003c0 898ca900 9f00: 00000003 83e4a4c0 dfdd9fa4 dfdd9f18 805bb0cc 8148d334 ecac8b10 83e4a4c0 9f20: dfdd9f3c dfdd9f30 81b5b1a0 81b5b06c dfdd9f54 dfdd9f40 8025a7a8 8028e490 9f40: dfdd9fb0 40000000 dfdd9f84 dfdd9f58 80220bdc 8025a764 00000000 82a1eb0c 9f60: dfdd9fb0 0013ea80 ecac8b10 80220b30 00000000 1b9ad9b3 dfdd9fac 00000000 9f80: 00000000 00356310 00000036 8020029c 83e4a4c0 00000036 00000000 dfdd9fa8 9fa0: 80200060 805bae94 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1e0dc 9fe0: 76f1de88 76f1de78 00018ebc 001308e0 60000010 00000003 00000000 00000000 Call trace: [<81494e64>] (parport_attach) from [<81490b50>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfdd9d90 r6:00000000 r5:81e2e428 r4:82bd8ea0 [<81490a48>] (comedi_device_attach) from [<8148c354>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83e4a4c0 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:845ec000 r4:200003c0 [<8148c288>] (do_devconfig_ioctl) from [<8148d67c>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:845ec000 r4:898ca900 [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8148d328>] (comedi_unlocked_ioctl) from [<805bb0cc>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83e4a4c0 r9:00000003 r8:898ca900 r7:200003c0 r6:40946400 r5:898ca901 r4:00000000 [<805bae88>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfdd9fa8 to 0xdfdd9ff0) 9fa0: 00000000 00000000 00000003 40946400 200003c0 00000000 9fc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76f1e0dc 9fe0: 76f1de88 76f1de78 00018ebc 001308e0 r10:00000036 r9:83e4a4c0 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb67f58 e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb67f58 bl 0xfed9fd68 4: e5953064 ldr r3, [r5, #100] @ 0x64 8: e7f33053 ubfx r3, r3, #0, #20 c: e2433612 sub r3, r3, #18874368 @ 0x1200000 * 10: e5c34000 strb r4, [r3] <-- trapping instruction