------------[ cut here ]------------ WARNING: CPU: 1 PID: 8989 at ./include/linux/kref.h:46 kref_get include/linux/kref.h:46 [inline] WARNING: CPU: 1 PID: 8989 at ./include/linux/kref.h:46 kobject_get lib/kobject.c:596 [inline] WARNING: CPU: 1 PID: 8989 at ./include/linux/kref.h:46 kobject_get+0xd9/0xf0 lib/kobject.c:589 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 8989 Comm: blkid Not tainted 4.9.186+ #9 ffff8801ce4ef618 ffffffff81b5a0b1 0000000000000000 ffffffff82a3a9a0 00000000ffffffff 0000000000000001 0000000000000009 ffff8801ce4ef6f8 ffffffff813fd59a 0000000041b58ab3 ffffffff82e317a2 ffffffff813fd3c1 Call Trace: [<0000000080409152>] __dump_stack lib/dump_stack.c:15 [inline] [<0000000080409152>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000006a583107>] panic+0x1d9/0x3bd kernel/panic.c:180 [<00000000e792e1af>] __warn.cold+0x2f/0x2f kernel/panic.c:546 [<00000000b3cbaa49>] warn_slowpath_null+0x2d/0x40 kernel/panic.c:589 [<0000000042334ce5>] kref_get include/linux/kref.h:46 [inline] [<0000000042334ce5>] kobject_get lib/kobject.c:596 [inline] [<0000000042334ce5>] kobject_get+0xd9/0xf0 lib/kobject.c:589 [<00000000c5dd93b4>] get_disk+0x8c/0xe0 block/genhd.c:1344 [<0000000029fceccd>] get_gendisk block/genhd.c:724 [inline] [<0000000029fceccd>] get_gendisk+0x171/0x2d0 block/genhd.c:709 [<00000000d09e368c>] __blkdev_get+0x356/0xeb0 fs/block_dev.c:1267 [<00000000fd4161dc>] blkdev_get+0x2e8/0x920 fs/block_dev.c:1424 [<00000000393a4945>] blkdev_open+0x1aa/0x250 fs/block_dev.c:1579 [<00000000314ffeeb>] do_dentry_open+0x422/0xd20 fs/open.c:772 [<000000000e589fc2>] vfs_open+0x105/0x230 fs/open.c:885 [<000000000c1da438>] do_last fs/namei.c:3457 [inline] [<000000000c1da438>] path_openat+0xbf5/0x2f60 fs/namei.c:3581 [<0000000042139090>] do_filp_open+0x1a1/0x280 fs/namei.c:3615 [<00000000909d4059>] do_sys_open+0x2f0/0x610 fs/open.c:1078 [<000000001e2c58ad>] SYSC_open fs/open.c:1096 [inline] [<000000001e2c58ad>] SyS_open+0x2d/0x40 fs/open.c:1091 [<00000000a45befb3>] do_syscall_64+0x1ad/0x5c0 arch/x86/entry/common.c:288 [<00000000d80927cb>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Kernel Offset: disabled Rebooting in 86400 seconds..