------------[ cut here ]------------
WARNING: CPU: 0 PID: 13404 at ./include/linux/kref.h:46 kref_get include/linux/kref.h:46 [inline]
WARNING: CPU: 0 PID: 13404 at ./include/linux/kref.h:46 kobject_get lib/kobject.c:596 [inline]
WARNING: CPU: 0 PID: 13404 at ./include/linux/kref.h:46 kobject_get+0xd9/0xf0 lib/kobject.c:589
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 13404 Comm: syz-executor.4 Not tainted 4.9.190+ #5
 ffff8801c5ae7618 ffffffff81b65c51 0000000000000000 ffffffff82a3b1c0
 00000000ffffffff 0000000000000000 0000000000000009 ffff8801c5ae76f8
 ffffffff813febaa 0000000041b58ab3 ffffffff82e325f5 ffffffff813fe9d1
Call Trace:
 [<000000006c92e3a2>] __dump_stack lib/dump_stack.c:15 [inline]
 [<000000006c92e3a2>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
 [<00000000ac9ca064>] panic+0x1d9/0x3bd kernel/panic.c:180
 [<000000001f825a50>] __warn.cold+0x2f/0x2f kernel/panic.c:546
 [<000000000d983ee4>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589
 [<0000000038bface4>] kref_get include/linux/kref.h:46 [inline]
 [<0000000038bface4>] kobject_get lib/kobject.c:596 [inline]
 [<0000000038bface4>] kobject_get+0xd9/0xf0 lib/kobject.c:589
 [<00000000fe248709>] get_disk+0x8c/0xe0 block/genhd.c:1344
 [<00000000833beb60>] get_gendisk block/genhd.c:724 [inline]
 [<00000000833beb60>] get_gendisk+0x171/0x2d0 block/genhd.c:709
 [<000000006b0d9f4c>] __blkdev_get+0x356/0xeb0 fs/block_dev.c:1267
 [<00000000476950cf>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424
 [<0000000036f22874>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579
 [<000000005f328edc>] do_dentry_open+0x422/0xd20 fs/open.c:791
 [<000000006646ce86>] vfs_open+0x105/0x230 fs/open.c:904
 [<000000003a57fb78>] do_last fs/namei.c:3457 [inline]
 [<000000003a57fb78>] path_openat+0xbf5/0x2f60 fs/namei.c:3581
 [<000000009f725982>] do_filp_open+0x1a1/0x280 fs/namei.c:3615
 [<000000006f23f84e>] do_sys_open+0x2f0/0x610 fs/open.c:1097
 [<00000000d3038586>] SYSC_open fs/open.c:1115 [inline]
 [<00000000d3038586>] SyS_open fs/open.c:1110 [inline]
 [<00000000d3038586>] SYSC_creat fs/open.c:1135 [inline]
 [<00000000d3038586>] SyS_creat+0x27/0x30 fs/open.c:1133
 [<000000000e19988f>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288
 [<0000000016ca4319>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Kernel Offset: disabled
Rebooting in 86400 seconds..