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: 21116 Comm: syz.5.5023 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 : [<8150eb48>] lr : [<8150eb3c>] psr: 60000013 sp : dfcddd30 ip : dfcddd30 fp : dfcddd54 r10: 83536930 r9 : 00000003 r8 : 83b4f480 r7 : dfcddd90 r6 : dfcddd90 r5 : 83b4f480 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: 8c590280 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:974 Register r4 information: NULL pointer Register r5 information: slab kmalloc-192 start 83b4f480 pointer offset 0 size 192 Register r6 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2785 Register r7 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2785 Register r8 information: slab kmalloc-192 start 83b4f480 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 0xdfcdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2785 Register r12 information: 2-page vmalloc region starting at 0xdfcdc000 allocated at kernel_clone+0xc4/0x440 kernel/fork.c:2785 Process syz.5.5023 (pid: 21116, stack limit = 0xdfcdc000) Stack: (0xdfcddd30 to 0xdfcde000) dd20: ffffffff 00000004 833dc6f0 81e351a8 dd40: 00000000 dfcddd90 dfcddd8c dfcddd58 8150a7d8 8150eaf8 40946400 00000000 dd60: dfcddd7c 200003c0 83b4f480 b5403587 40946400 00000002 00000003 83bbb200 dd80: dfcdde4c dfcddd90 81505ff4 8150a6dc 656d6f63 705f6964 6f707261 00007472 dda0: 00000000 00000140 00000000 00000003 00000005 00000002 00000002 00007ffd ddc0: 00000006 00000008 0000000f 00000004 00000010 000000f8 00000008 000004ce dde0: 00009e9b 00000101 000003fe 00000009 000007ff 00000004 00000008 0000000a de00: 000003ff 00000001 00000002 000000af 00000000 010001fc 00000004 00000004 de20: 00000000 dfceae9b 00000000 936a1800 83b4f480 200003c0 40946400 00000002 de40: dfcddf14 dfcdde50 81507304 81505f34 8255ca54 84f47dd8 00000064 84af6cfc de60: dfcddee4 dfcdde70 80832fe4 80829344 00000064 83b4f4b0 00000000 dfcdde90 de80: 00000000 8590e010 83c2ac38 40946400 0000000b 00000000 dfcdde84 00000000 dea0: 00000000 00000000 00000000 00000000 00000000 dfceae9b 00000000 936a1800 dec0: 40946400 200003c0 200003c0 936a1800 00000003 83bbb200 dfcddef4 dfcddee8 dee0: 80833114 dfceae9b dfcddf14 00000000 936a1801 40946400 200003c0 936a1800 df00: 00000003 83bbb200 dfcddfa4 dfcddf18 805d804c 81506fbc ecac8b10 83bbb200 df20: dfcddf3c dfcddf30 81be804c 81be7f18 dfcddf54 dfcddf40 8025bb4c 80291178 df40: dfcddfb0 40000000 dfcddf84 dfcddf58 80221bfc 8025bb04 00000000 8321a04c df60: dfcddfb0 0013ee90 ecac8b10 80221b50 00000000 dfceae9b dfcddfac 00000000 df80: 00000000 00356310 00000036 8020029c 83bbb200 00000036 00000000 dfcddfa8 dfa0: 80200060 805d7e14 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb10dc dfe0: 76fb0e88 76fb0e78 0001903c 00130cf0 60000010 00000003 00000000 00000000 Call trace: [<8150eaec>] (parport_attach) from [<8150a7d8>] (comedi_device_attach+0x108/0x244 drivers/comedi/drivers.c:1101) r7:dfcddd90 r6:00000000 r5:81e351a8 r4:833dc6f0 [<8150a6d0>] (comedi_device_attach) from [<81505ff4>] (do_devconfig_ioctl+0xcc/0x218 drivers/comedi/comedi_fops.c:930) r10:83bbb200 r9:00000003 r8:00000002 r7:40946400 r6:b5403587 r5:83b4f480 r4:200003c0 [<81505f28>] (do_devconfig_ioctl) from [<81507304>] (comedi_unlocked_ioctl+0x354/0x1db8 drivers/comedi/comedi_fops.c:2302) r8:00000002 r7:40946400 r6:200003c0 r5:83b4f480 r4:936a1800 [<81506fb0>] (comedi_unlocked_ioctl) from [<805d804c>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<81506fb0>] (comedi_unlocked_ioctl) from [<805d804c>] (do_vfs_ioctl fs/ioctl.c:551 [inline]) [<81506fb0>] (comedi_unlocked_ioctl) from [<805d804c>] (__do_sys_ioctl fs/ioctl.c:595 [inline]) [<81506fb0>] (comedi_unlocked_ioctl) from [<805d804c>] (sys_ioctl+0x244/0xb5c fs/ioctl.c:583) r10:83bbb200 r9:00000003 r8:936a1800 r7:200003c0 r6:40946400 r5:936a1801 r4:00000000 [<805d7e08>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdfcddfa8 to 0xdfcddff0) dfa0: 00000000 00000000 00000003 40946400 200003c0 00000000 dfc0: 00000000 00000000 00356310 00000036 003562d8 00000000 00000001 76fb10dc dfe0: 76fb0e88 76fb0e78 0001903c 00130cf0 r10:00000036 r9:83bbb200 r8:8020029c r7:00000036 r6:00356310 r5:00000000 r4:00000000 Code: ebb49c4d e5953064 e7f33053 e2433612 (e5c34000) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: ebb49c4d bl 0xfed2713c 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