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: 11083 Comm: syz.5.1154 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 : [<81459bdc>] lr : [<81459bcc>] psr: 60000013 sp : ea6d9d30 ip : ea6d9d30 fp : ea6d9d54 r10: 82d2cdc4 r9 : 00000003 r8 : 8301b600 r7 : ea6d9d90 r6 : 8301b600 r5 : 00000000 r4 : 00000000 r3 : fee00078 r2 : 81e277a8 r1 : 00000001 r0 : 8145983c Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user Control: 30c5387d Table: 86486080 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 8301b600 pointer offset 0 size 192 Register r7 information: 2-page vmalloc region starting at 0xea6d8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r8 information: slab kmalloc-192 start 8301b600 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 0xea6d8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Register r12 information: 2-page vmalloc region starting at 0xea6d8000 allocated at kernel_clone+0xbc/0x43c kernel/fork.c:2721 Process syz.5.1154 (pid: 11083, stack limit = 0xea6d8000) Stack: (0xea6d9d30 to 0xea6da000) 9d20: 824bd074 8301b600 00000000 82bd2c7c 9d40: 81e27c68 00000000 ea6d9d8c ea6d9d58 81455740 81459a64 b5403587 00000000 9d60: 00000003 20000600 8301b600 b5403587 40946400 00000003 00000003 87715780 9d80: ea6d9e4c ea6d9d90 81450f4c 81455644 656d6f63 705f6964 6f707261 00007472 9da0: 00000000 00000078 00000078 00000000 0000000c 00000008 00000006 00100002 9dc0: 00000007 00000005 00000100 00000004 00000001 00000001 00020003 00000000 9de0: 00000101 00000083 80000000 00000003 00001b18 00000016 00000004 00000000 9e00: ffffffff 0000000b 00000004 0000003b 0000000c 10000006 00000664 fffffff8 9e20: 00000000 3f75c21b 00000000 84eb4700 8301b600 20000600 40946400 00000003 9e40: ea6d9f14 ea6d9e50 81452270 81450e84 00000000 3f75c21b 00000000 00000000 9e60: 82531804 ea6d9ea4 0000005f 841825e0 00000064 8301b630 ea6d9ee4 ea6d9e88 9e80: 807ea28c 807e05a0 00000064 00000001 00000000 ea6d9ea4 87280e50 8341d440 9ea0: 00006400 0000000b ea6d9e98 00000000 00000000 3f75c21b 00000000 84eb4700 9ec0: 40946400 20000600 20000600 84eb4700 00000003 87715780 ea6d9ef4 ea6d9ee8 9ee0: 807ea3c0 3f75c21b ea6d9f14 00000000 84eb4701 40946400 20000600 84eb4700 9f00: 00000003 87715780 ea6d9fa4 ea6d9f18 805a1c14 81451f28 ecac8b10 87715780 9f20: ea6d9f3c ea6d9f30 81b18494 81b18360 ea6d9f54 ea6d9f40 8025a6bc 8028e2a4 9f40: ea6d9fb0 40000000 ea6d9f84 ea6d9f58 80220be0 8025a678 00000000 82a1c63c 9f60: ea6d9fb0 0013e9b0 ecac8b10 80220b34 00000000 3f75c21b ea6d9fac 00000000 9f80: 00000000 00346310 00000036 8020029c 87715780 00000036 00000000 ea6d9fa8 9fa0: 80200060 805a19dc 00000000 00000000 00000003 40946400 20000600 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f010dc 9fe0: 76f00e88 76f00e78 00018ebc 00130810 60000010 00000003 00000000 00000000 Call trace: [<81459a58>] (parport_attach) from [<81455740>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r6:00000000 r5:81e27c68 r4:82bd2c7c [<81455638>] (comedi_device_attach) from [<81450f4c>] (do_devconfig_ioctl+0xd4/0x21c drivers/comedi/comedi_fops.c:930) r10:87715780 r9:00000003 r8:00000003 r7:40946400 r6:b5403587 r5:8301b600 r4:20000600 [<81450e78>] (do_devconfig_ioctl) from [<81452270>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000003 r7:40946400 r6:20000600 r5:8301b600 r4:84eb4700 [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81451f1c>] (comedi_unlocked_ioctl) from [<805a1c14>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:87715780 r9:00000003 r8:84eb4700 r7:20000600 r6:40946400 r5:84eb4701 r4:00000000 [<805a19d0>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xea6d9fa8 to 0xea6d9ff0) 9fa0: 00000000 00000000 00000003 40946400 20000600 00000000 9fc0: 00000000 00000000 00346310 00000036 003462d8 00000000 00000001 76f010dc 9fe0: 76f00e88 76f00e78 00018ebc 00130810 r10:00000036 r9:87715780 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