pts pts0: tty_release: tty->count(3) != (#fd's(2) + #kopen's(0))
hfs: can't find a HFS filesystem on dev loop6
hfs: can't find a HFS filesystem on dev loop6
==================================================================
BUG: KASAN: user-memory-access in memset include/linux/string.h:330 [inline]
BUG: KASAN: user-memory-access in bitmap_zero include/linux/bitmap.h:208 [inline]
BUG: KASAN: user-memory-access in n_tty_set_termios+0xfc/0xcf0 drivers/tty/n_tty.c:1766
Write of size 512 at addr 0000000000001060 by task syz-executor7/8509

CPU: 1 PID: 8509 Comm: syz-executor7 Not tainted 4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 kasan_report_error mm/kasan/report.c:352 [inline]
 kasan_report+0x140/0x360 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memset+0x23/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:330 [inline]
 bitmap_zero include/linux/bitmap.h:208 [inline]
 n_tty_set_termios+0xfc/0xcf0 drivers/tty/n_tty.c:1766
 tty_set_termios+0x750/0xa60 drivers/tty/tty_ioctl.c:341
 set_termios+0x392/0x6d0 drivers/tty/tty_ioctl.c:414
 tty_mode_ioctl+0x9fc/0xb30 drivers/tty/tty_ioctl.c:749
 n_tty_ioctl_helper+0x40/0x360 drivers/tty/tty_ioctl.c:940
 n_tty_ioctl+0x14d/0x2d0 drivers/tty/n_tty.c:2441
 tty_ioctl+0x336/0x1610 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007face4a5ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007face4a5f6d4 RCX: 0000000000454e79
RDX: 0000000020000040 RSI: 0000000000005402 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002f9 R14: 00000000006f67f8 R15: 0000000000000000
==================================================================
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 8509 Comm: syz-executor7 Tainted: G    B            4.16.0-rc7+ #9
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x194/0x24d lib/dump_stack.c:53
 panic+0x1e4/0x41c kernel/panic.c:183
 kasan_end_report+0x50/0x50 mm/kasan/report.c:180
 kasan_report_error mm/kasan/report.c:359 [inline]
 kasan_report+0x149/0x360 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x137/0x190 mm/kasan/kasan.c:267
 memset+0x23/0x40 mm/kasan/kasan.c:285
 memset include/linux/string.h:330 [inline]
 bitmap_zero include/linux/bitmap.h:208 [inline]
 n_tty_set_termios+0xfc/0xcf0 drivers/tty/n_tty.c:1766
 tty_set_termios+0x750/0xa60 drivers/tty/tty_ioctl.c:341
 set_termios+0x392/0x6d0 drivers/tty/tty_ioctl.c:414
 tty_mode_ioctl+0x9fc/0xb30 drivers/tty/tty_ioctl.c:749
 n_tty_ioctl_helper+0x40/0x360 drivers/tty/tty_ioctl.c:940
 n_tty_ioctl+0x14d/0x2d0 drivers/tty/n_tty.c:2441
 tty_ioctl+0x336/0x1610 drivers/tty/tty_io.c:2655
 vfs_ioctl fs/ioctl.c:46 [inline]
 do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686
 SYSC_ioctl fs/ioctl.c:701 [inline]
 SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692
 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x454e79
RSP: 002b:00007face4a5ec68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007face4a5f6d4 RCX: 0000000000454e79
RDX: 0000000020000040 RSI: 0000000000005402 RDI: 0000000000000015
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000000002f9 R14: 00000000006f67f8 R15: 0000000000000000
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..