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: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0-rc7-next-20170829+ #11
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
task: ffff88003e04e340 task.stack: ffff88003e050000
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: 0018:ffff88003ed07aa8 EFLAGS: 00010806
RAX: 1bd5a00000000041 RBX: ffff88003ac43a00 RCX: 1ffff10007da0f9e
RDX: ffff88003ed07cf0 RSI: 0000000000000008 RDI: dead000000000208
RBP: ffff88003ed07d98 R08: ffff88003ed073f8 R09: ffff88003ed073f0
R10: ffff88003ed07368 R11: 1ffff10007c09efb R12: ffff88003ac43a08
R13: dffffc0000000000 R14: dead000000000200 R15: ffff88003ed07d70
FS: 0000000000000000(0000) GS:ffff88003ed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002001f000 CR3: 000000006c0dd000 CR4: 00000000000006e0
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: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:824 [inline]
RIP: 0010:tick_nohz_idle_enter+0x112/0x160 kernel/time/tick-sched.c:979
RSP: 0018:ffff88003e057eb0 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff10
RAX: ffff88003e04e340 RBX: ffff88003ed1db80 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffffffff85ac97b8
RBP: ffff88003e057eb8 R08: ffff88003ed1d4d8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88003ed13040
R13: 000000000034007c R14: 0000000000000000 R15: 0000000000000000
do_idle+0x29/0x3b0 kernel/sched/idle.c:223
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351
start_secondary+0x277/0x310 arch/x86/kernel/smpboot.c:275
secondary_startup_64+0xa5/0xa5 arch/x86/kernel/head_64.S:235
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: ffff88003ed07aa8
RIP: detach_timer kernel/time/timer.c:791 [inline] RSP: ffff88003ed07aa8
RIP: expire_timers kernel/time/timer.c:1309 [inline] RSP: ffff88003ed07aa8
RIP: __run_timers+0x619/0xb90 kernel/time/timer.c:1620 RSP: ffff88003ed07aa8
---[ end trace 90338ab9cd33b580 ]---
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 ffff88005db9be48 by task syz-fuzzer/2973
CPU: 3 PID: 2973 Comm: syz-fuzzer Tainted: G D 4.13.0-rc7-next-20170829+ #11
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: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:814 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x5e/0xba kernel/locking/spinlock.c:191
RSP: 0018:ffff88006ae1fbf0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff10
RAX: dffffc0000000000 RBX: 0000000000000286 RCX: 0000000000000000
RDX: 1ffffffff0b592f5 RSI: 0000000000000001 RDI: 0000000000000286
RBP: ffff88006ae1fc00 R08: ffff880039d29828 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880039d29810
R13: 0000000000000041 R14: 0000000000000001 R15: 0000000000000286
spin_unlock_irqrestore include/linux/spinlock.h:371 [inline]
__wake_up_sync_key+0x4b/0x60 kernel/sched/wait.c:148
pipe_write+0x64e/0xd70 fs/pipe.c:481
call_write_iter include/linux/fs.h:1744 [inline]
new_sync_write fs/read_write.c:457 [inline]
__vfs_write+0x68a/0x970 fs/read_write.c:470
vfs_write+0x18f/0x510 fs/read_write.c:518
SYSC_write fs/read_write.c:565 [inline]
SyS_write+0xef/0x220 fs/read_write.c:557
entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x48c4d4
RSP: 002b:000000c4344b4f50 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000048c4d4
RDX: 0000000000000018 RSI: 000000c4344b51b8 RDI: 0000000000000039
RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000c437089c21
R13: 0000000000000001 R14: 000000c437089c38 R15: 0000000000000002
Allocated by task 6729:
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:8010
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 6741:
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+0x4c/0x60 net/core/dev.c:7962
netdev_release+0x76/0x90 net/core/net-sysfs.c:1492
device_release+0x7c/0x200 drivers/base/core.c:814
kobject_cleanup lib/kobject.c:648 [inline]
kobject_release lib/kobject.c:677 [inline]
kref_put include/linux/kref.h:70 [inline]
kobject_put+0x14c/0x240 lib/kobject.c:694
netdev_run_todo+0x914/0xca0 net/core/dev.c:7867
rtnl_unlock+0xe/0x10 net/core/rtnetlink.c:106
tun_detach drivers/net/tun.c:588 [inline]
tun_chr_close+0x49/0x60 drivers/net/tun.c:2595
__fput+0x333/0x7f0 fs/file_table.c:210
____fput+0x15/0x20 fs/file_table.c:246
task_work_run+0x199/0x270 kernel/task_work.c:112
exit_task_work include/linux/task_work.h:21 [inline]
do_exit+0xa52/0x1b40 kernel/exit.c:865
do_group_exit+0x149/0x400 kernel/exit.c:968
get_signal+0x7e8/0x17e0 kernel/signal.c:2334
do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
entry_SYSCALL_64_fastpath+0xbc/0xbe
The buggy address belongs to the object at ffff88005db98a40
which belongs to the cache kmalloc-16384 of size 16384
The buggy address is located 13320 bytes inside of
16384-byte region [ffff88005db98a40, ffff88005db9ca40)
The buggy address belongs to the page:
page:ffffea000176e600 count:1 mapcount:0 mapping:ffff88005db98a40 index:0x0 compound_mapcount: 0
flags: 0x500000000008100(slab|head)
raw: 0500000000008100 ffff88005db98a40 0000000000000000 0000000100000001
raw: ffffea0001702020 ffffea0001b24420 ffff88003e802200 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88005db9bd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88005db9bd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88005db9be00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88005db9be80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88005db9bf00: 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..