kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
(ftrace buffer empty)
Modules linked in:
CPU: 2 PID: 3026 Comm: syz-fuzzer Not tainted 4.13.0-rc6-next-20170828+ #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff8800399e4700 task.stack: ffff88003a3d0000
RIP: 0010:__hlist_del include/linux/list.h:650 [inline]
RIP: 0010:detach_timer kernel/time/timer.c:791 [inline]
RIP: 0010:expire_timers kernel/time/timer.c:1309 [inline]
RIP: 0010:__run_timers+0x619/0xb90 kernel/time/timer.c:1620
RSP: 0000:ffff88006de07aa8 EFLAGS: 00010806
RAX: 1bd5a00000000041 RBX: ffff88004ca0bb40 RCX: 1ffff1000dbc0f9e
RDX: ffff88006de07cf0 RSI: 0000000000000008 RDI: dead000000000208
RBP: ffff88006de07d98 R08: ffff88006de073f8 R09: ffff88006de073f0
R10: ffff88006de07368 R11: 1ffff1000733cb73 R12: ffff88004ca0bb48
R13: dffffc0000000000 R14: dead000000000200 R15: ffff88006de07d70
FS: 00007fdba7ca8700(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c439875000 CR3: 000000006cb0e000 CR4: 00000000000006e0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
__do_softirq+0x2bd/0xbd4 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:638 [inline]
smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:1044
apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
RIP: 0033:0x41317a
RSP: 002b:00007fdba7ca7d78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff10
RAX: 000000c4204c8000 RBX: 0000000000000000 RCX: 000000c420001500
RDX: 0000000000000001 RSI: 00007fdba5a09988 RDI: 00007fdba5a0998b
RBP: 00007fdba7ca7da8 R08: 000000000000001c R09: 0000000000000003
R10: 0000000000000010 R11: 0000000000000012 R12: 01ffffffffffffff
R13: 00000000000000ff R14: 00000000000000ff R15: 000000000000001b
Code: 4d 85 f6 4c 89 32 48 89 95 58 fd ff ff 42 c6 04 28 f8 74 26 e8 e9 35 10 00 49 8d 7e 08 48 8b 95 58 fd ff ff 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 0f 85 b5 04 00 00 49 89 56 08 e8 c3 35 10 00 4c
RIP: __hlist_del include/linux/list.h:650 [inline] RSP: ffff88006de07aa8
RIP: detach_timer kernel/time/timer.c:791 [inline] RSP: ffff88006de07aa8
RIP: expire_timers kernel/time/timer.c:1309 [inline] RSP: ffff88006de07aa8
RIP: __run_timers+0x619/0xb90 kernel/time/timer.c:1620 RSP: ffff88006de07aa8
---[ end trace 731d9fed8297ee17 ]---
Kernel panic - not syncing: Fatal exception in interrupt
BUG: KASAN: use-after-free in __collect_expired_timers include/linux/list.h:729 [inline]
BUG: KASAN: use-after-free in collect_expired_timers kernel/time/timer.c:1569 [inline]
BUG: KASAN: use-after-free in __run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
Write of size 8 at addr ffff8800370a3a88 by task syz-fuzzer/3067
CPU: 1 PID: 3067 Comm: syz-fuzzer Tainted: G D 4.13.0-rc6-next-20170828+ #10
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:16 [inline]
dump_stack+0x194/0x257 lib/dump_stack.c:52
print_address_description+0x73/0x250 mm/kasan/report.c:252
kasan_report_error mm/kasan/report.c:351 [inline]
kasan_report+0x24e/0x340 mm/kasan/report.c:409
__asan_report_store8_noabort+0x17/0x20 mm/kasan/report.c:435
__collect_expired_timers include/linux/list.h:729 [inline]
collect_expired_timers kernel/time/timer.c:1569 [inline]
__run_timers+0xa2e/0xb90 kernel/time/timer.c:1616
run_timer_softirq+0x4c/0xb0 kernel/time/timer.c:1646
__do_softirq+0x2bd/0xbd4 kernel/softirq.c:284
invoke_softirq kernel/softirq.c:364 [inline]
irq_exit+0x1d3/0x210 kernel/softirq.c:405
exiting_irq arch/x86/include/asm/apic.h:638 [inline]
smp_apic_timer_interrupt+0x76/0xa0 arch/x86/kernel/apic/apic.c:1044
apic_timer_interrupt+0x9d/0xb0 arch/x86/entry/entry_64.S:577
RIP: 0033:0x413f0b
RSP: 002b:00007fdba634ccc0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff10
RAX: 000000c420000000 RBX: 000000c4365b3ae0 RCX: 000000c420448d80
RDX: 000000000000b2d9 RSI: 00007fdba56d7c78 RDI: 000000c4365b2000
RBP: 00007fdba634cd08 R08: 0000000000000002 R09: 000000000448f240
R10: 0000000000000030 R11: 000000c4365b3ae0 R12: 0000000000000000
R13: 0000000000000000 R14: 000000000045cef0 R15: 0000000000000000
Allocated by task 4282:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:551
__do_kmalloc_node mm/slab.c:3689 [inline]
__kmalloc_node+0x47/0x70 mm/slab.c:3696
kmalloc_node include/linux/slab.h:535 [inline]
kvmalloc_node+0x64/0xd0 mm/util.c:397
kvmalloc include/linux/mm.h:529 [inline]
kvzalloc include/linux/mm.h:537 [inline]
alloc_netdev_mqs+0x16e/0xed0 net/core/dev.c:8009
tun_set_iff drivers/net/tun.c:2008 [inline]
__tun_chr_ioctl+0x12be/0x3d20 drivers/net/tun.c:2262
tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507
vfs_ioctl fs/ioctl.c:45 [inline]
do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
SYSC_ioctl fs/ioctl.c:700 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
entry_SYSCALL_64_fastpath+0x1f/0xbe
Freed by task 4282:
save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59
save_stack+0x43/0xd0 mm/kasan/kasan.c:447
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0x71/0xc0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3503 [inline]
kfree+0xca/0x250 mm/slab.c:3820
kvfree+0x36/0x60 mm/util.c:416
netdev_freemem net/core/dev.c:7961 [inline]
free_netdev+0x2cf/0x360 net/core/dev.c:8123
tun_set_iff drivers/net/tun.c:2091 [inline]
__tun_chr_ioctl+0x2cf6/0x3d20 drivers/net/tun.c:2262
tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:2507
vfs_ioctl fs/ioctl.c:45 [inline]
do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:685
SYSC_ioctl fs/ioctl.c:700 [inline]
SyS_ioctl+0x8f/0xc0 fs/ioctl.c:691
entry_SYSCALL_64_fastpath+0x1f/0xbe
The buggy address belongs to the object at ffff8800370a0680
which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 13320 bytes inside of
16384-byte region [ffff8800370a0680, ffff8800370a4680)
The buggy address belongs to the page:
page:ffffea0000dc2800 count:1 mapcount:0 mapping:ffff8800370a0680 index:0xffff8800370a0680 compound_mapcount: 0
flags: 0x100000000008100(slab|head)
raw: 0100000000008100 ffff8800370a0680 ffff8800370a0680 0000000100000000
raw: ffffea0000c52020 ffff88003e801c60 ffff88003e802200 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8800370a3980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8800370a3a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8800370a3a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8800370a3b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8800370a3b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Shutting down cpus with NMI
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..