PID: 83630  TASK: ffff977d4de84f80  CPU: 1   COMMAND: "umount"
 #0 [ffffb17249f4bbc0] machine_kexec at ffffffffaaa850a3
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/arch/x86/kernel/machine_kexec_64.c: 417
 #1 [ffffb17249f4bc18] __crash_kexec at ffffffffaac3e5ba
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/kernel/kexec_core.c: 955
 #2 [ffffb17249f4bcd8] panic at ffffffffaab199d8
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/kernel/panic.c: 230
 #3 [ffffb17249f4bd58] lbug_with_loc.cold.4 at ffffffffc07a3f89 [libcfs]
    /home/green/git/lustre-release/libcfs/libcfs/debug.c: 525
 #4 [ffffb17249f4bd60] lustre_put_lsi at ffffffffc09ca91c [obdclass]
    /home/green/git/lustre-release/lustre/obdclass/obd_mount.c: 706
 #5 [ffffb17249f4bd80] server_put_super at ffffffffc0f29228 [ptlrpc]
    /home/green/git/lustre-release/lustre/ptlrpc/../../lustre/target/tgt_mount.c: 2087
 #6 [ffffb17249f4be60] generic_shutdown_super at ffffffffaaed46d1
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/super.c: 462
 #7 [ffffb17249f4be78] kill_anon_super at ffffffffaaed50cc
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/super.c: 1094
 #8 [ffffb17249f4be88] lustre_kill_super at ffffffffc1eb0ada [lustre]
    /home/green/git/lustre-release/lustre/llite/super25.c: 270
 #9 [ffffb17249f4be98] deactivate_locked_super at ffffffffaaed4332
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/super.c: 340
#10 [ffffb17249f4beb0] deactivate_super at ffffffffaaed4533
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/super.c: 364
#11 [ffffb17249f4bec0] cleanup_mnt at ffffffffaaf0b8ff
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/namespace.c: 115
#12 [ffffb17249f4bed0] __cleanup_mnt at ffffffffaaf0b9f6
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/fs/namespace.c: 1147
#13 [ffffb17249f4bed8] task_work_run at ffffffffaab52ae6
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/kernel/task_work.c: 137
#14 [ffffb17249f4bf10] exit_to_usermode_loop at ffffffffaaa0387d
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/./include/linux/tracehook.h: 188
#15 [ffffb17249f4bf38] do_syscall_64 at ffffffffaaa04956
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/arch/x86/entry/common.c: 201
#16 [ffffb17249f4bf50] entry_SYSCALL_64_after_hwframe at ffffffffaba000bd
    /home/green/bk/linux-4.18.0-553.58.1.el8_10-debug/arch/x86/entry/entry_64.S: 156
    RIP: 00007fc6b67058fb  RSP: 00007fff9b9fea98  RFLAGS: 00000202
    RAX: 0000000000000000  RBX: 0000563e007b1a40  RCX: 00007fc6b67058fb
    RDX: 0000000000000001  RSI: 0000000000000001  RDI: 0000563e007c5090
    RBP: 0000000000000001   R8: 0000563e007b7fa0   R9: 0000563e007b0010
    R10: 0000000000000000  R11: 0000000000000202  R12: 0000563e007c5090
    R13: 00007fc6b7589184  R14: 0000563e007b1c20  R15: 00000000ffffffff
    ORIG_RAX: 00000000000000a6  CS: 0033  SS: 002b