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: 1 UID: 0 PID: 16467 Comm: syz.4.3543 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 : [<81459ddc>] lr : [<81459dcc>] psr: 60030013 sp : ea88dd30 ip : ea88dd30 fp : ea88dd54 r10: 82d2cdc4 r9 : 00000003 r8 : 8334b9c0 r7 : ea88dd90 r6 : 8334b9c0 r5 : 00000000 r4 : 00000000 r3 : fee00078 r2 : 81e277a8 r1 : 00000001 r0 : 81459a3c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 30c5387d Table: 84e69600 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 8334b9c0 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea88c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8334b9c0 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 0xea88c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea88c000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.4.3543 (pid: 16467, stack limit = 0xea88c000) Stack: (0xea88dd30 to 0xea88e000) dd20: 824bd0ec 8334b9c0 00000000 82bd2c7c dd40: 81e27c68 00000000 ea88dd8c ea88dd58 81455940 81459c64 40946400 00000000 dd60: ea88dd7c 20000600 8334b9c0 b5403587 40946400 00000003 00000003 84030c80 dd80: ea88de4c ea88dd90 8145114c 81455844 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000078 fffffffe 00000004 0000000c 00000008 00000006 00100002 ddc0: 000003e1 00000005 00000100 00000004 00000001 00000001 04020003 00000000 dde0: 00000101 00000083 80000000 00000003 00001b18 00000016 00000004 00000000 de00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 de20: 00000000 8e21a90a 00000000 83a6d480 8334b9c0 20000600 40946400 00000003 de40: ea88df14 ea88de50 81452470 81451084 ea88de4c 8e21a90a 00000000 00000000 de60: 82531804 ea88dea4 0000005f 8427a990 00000064 8334b9f0 ea88dee4 ea88de88 de80: 807ea2d4 807e05e8 00000064 00000001 00000000 ea88dea4 861e7790 834287f8 dea0: 00006400 0000000b ea88de98 00000000 ea88dd38 8e21a90a 00000000 83a6d480 dec0: 40946400 20000600 20000600 83a6d480 00000003 84030c80 ea88def4 ea88dee8 dee0: 807ea408 8e21a90a ea88df14 00000000 83a6d481 40946400 20000600 83a6d480 df00: 00000003 84030c80 ea88dfa4 ea88df18 805a1c5c 81452128 ecac8b10 84030c80 df20: ea88df3c ea88df30 81b18714 81b185e0 ea88df54 ea88df40 8025a6bc 8028e2a4 df40: ea88dfb0 40000000 ea88df84 ea88df58 80220be0 8025a678 00000000 82a1c63c df60: ea88dfb0 0013e9b0 ecac8b10 80220b34 00000000 8e21a90a ea88dfac 00000000 df80: 00000000 00346310 00000036 8020029c 84030c80 00000036 00000000 ea88dfa8 dfa0: 80200060 805a1a24 00000000 00000000 00000003 40946400 20000600 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0d0dc dfe0: 76f0ce88 76f0ce78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81459c58>] (parport_attach) from [<81455940>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455838>] (comedi_device_attach) from [<8145114c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:84030c80 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8334b9c0 r4:20000600 [<81451078>] (do_devconfig_ioctl) from [<81452470>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8334b9c0 r4:83a6d480 [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<8145211c>] (comedi_unlocked_ioctl) from [<805a1c5c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:84030c80 r9:00000003 r8:83a6d480 r7:20000600 r6:40946400 r5:83a6d481 r4:00000000 [<805a1a18>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea88dfa8 to 0xea88dff0) dfa0: 00000000 00000000 00000003 40946400 20000600 00000000 dfc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f0d0dc dfe0: 76f0ce88 76f0ce78 00018ebc 00130810 r10:00000036 r9:84030c80 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