device eql entered promiscuous mode
==================================================================
BUG: KASAN: stack-out-of-bounds in iov_iter_advance+0x4c0/0x4f0 lib/iov_iter.c:491
Read of size 8 at addr ffff8800b6377d38 by task syzkaller806650/3316

CPU: 1 PID: 3316 Comm: syzkaller806650 Not tainted 4.4.107-g610c835 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 49616298a582e995 ffff8800b6377978 ffffffff81d0457d
 ffffea0002d8ddc0 ffff8800b6377d38 0000000000000000 ffff8800b6377d38
 ffff8800b6377d30 ffff8800b63779b0 ffffffff814fbb23 ffff8800b6377d38
Call Trace:
 [<ffffffff81d0457d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0457d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff814fbb23>] print_address_description+0x73/0x260 mm/kasan/report.c:252
 [<ffffffff814fc035>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff814fc035>] kasan_report+0x285/0x370 mm/kasan/report.c:408
 [<ffffffff814fc194>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81d3f240>] iov_iter_advance+0x4c0/0x4f0 lib/iov_iter.c:491
 [<ffffffff8265609b>] tun_put_user drivers/net/tun.c:1369 [inline]
 [<ffffffff8265609b>] tun_do_read+0xa7b/0xcc0 drivers/net/tun.c:1421
 [<ffffffff82658e82>] tun_chr_read_iter+0xe2/0x1e0 drivers/net/tun.c:1439
 [<ffffffff8151aca9>] new_sync_read fs/read_write.c:422 [inline]
 [<ffffffff8151aca9>] __vfs_read+0x339/0x440 fs/read_write.c:434
 [<ffffffff8151c913>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff8151f259>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff8151f259>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff83773d36>] entry_SYSCALL_64_fastpath+0x16/0x76

The buggy address belongs to the page:
page:ffffea0002d8ddc0 count:0 mapcount:0 mapping:          (null) index:0x0
flags: 0x4000000000000000()
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8800b6377c00: f2 f2 f2 f2 f2 00 02 f2 f2 00 00 00 00 00 00 00
 ffff8800b6377c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8800b6377d00: f1 f1 f1 f1 00 00 f2 f2 f2 f2 f2 f2 00 00 00 00
                                        ^
 ffff8800b6377d80: 00 f2 f2 f2 f2 f2 f2 f2 00 00 00 00 00 f2 f2 f2
 ffff8800b6377e00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3316 Comm: syzkaller806650 Tainted: G    B           4.4.107-g610c835 #12
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 49616298a582e995 ffff8800b63778d0 ffffffff81d0457d
 ffffffff83fb2cde ffff8800b63779a8 0000000000000000 ffff8800b6377d38
 ffff8800b6377d30 ffff8800b6377998 ffffffff8141774a 0000000041b58ab3
Call Trace:
 [<ffffffff81d0457d>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d0457d>] dump_stack+0xc1/0x124 lib/dump_stack.c:51
 [<ffffffff8141774a>] panic+0x1aa/0x388 kernel/panic.c:112
 [<ffffffff814fba90>] kasan_end_report+0x50/0x50 mm/kasan/report.c:176
 [<ffffffff814fbf0c>] kasan_report_error mm/kasan/report.c:356 [inline]
 [<ffffffff814fbf0c>] kasan_report+0x15c/0x370 mm/kasan/report.c:408
 [<ffffffff814fc194>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff81d3f240>] iov_iter_advance+0x4c0/0x4f0 lib/iov_iter.c:491
 [<ffffffff8265609b>] tun_put_user drivers/net/tun.c:1369 [inline]
 [<ffffffff8265609b>] tun_do_read+0xa7b/0xcc0 drivers/net/tun.c:1421
 [<ffffffff82658e82>] tun_chr_read_iter+0xe2/0x1e0 drivers/net/tun.c:1439
 [<ffffffff8151aca9>] new_sync_read fs/read_write.c:422 [inline]
 [<ffffffff8151aca9>] __vfs_read+0x339/0x440 fs/read_write.c:434
 [<ffffffff8151c913>] vfs_read+0x123/0x3a0 fs/read_write.c:454
 [<ffffffff8151f259>] SYSC_read fs/read_write.c:569 [inline]
 [<ffffffff8151f259>] SyS_read+0xd9/0x1b0 fs/read_write.c:562
 [<ffffffff83773d36>] entry_SYSCALL_64_fastpath+0x16/0x76
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..