[Bug 252375] kernel panic during reboot "softdep_waitidle: work added after flush"

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252375

            Bug ID: 252375
           Summary: kernel panic during reboot "softdep_waitidle: work
                    added after flush"
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: gbe at FreeBSD.org

After an installworld installkernel, the machine panics with "softdep_waitidle:
work added after flush". A core dump is available on request.

Waiting (max 60 seconds) for system process `vnlru' to stop... done
Waiting (max 60 seconds) for system process `syncer' to stop...
Syncing disks, vnodes remaining... 4 2 2 1 1 0 0 done
Waiting (max 60 seconds) for system thread `bufdaemon' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-0' to stop... done
Waiting (max 60 seconds) for system thread `bufspacedaemon-1' to stop... done
All buffers synced.
panic: softdep_waitidle: work added after flush
cpuid = 0
time = 1609629605
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe009db49790
vpanic() at vpanic+0x181/frame 0xfffffe009db497e0
panic() at panic+0x43/frame 0xfffffe009db49840
softdep_flushfiles() at softdep_flushfiles+0x445/frame 0xfffffe009db498d0
ffs_unmount() at ffs_unmount+0x5d/frame 0xfffffe009db49940
dounmount() at dounmount+0x42c/frame 0xfffffe009db499b0
vfs_unmountall() at vfs_unmountall+0x6a/frame 0xfffffe009db499e0
bufshutdown() at bufshutdown+0x2ce/frame 0xfffffe009db49a30
kern_reboot() at kern_reboot+0x213/frame 0xfffffe009db49a70
sys_reboot() at sys_reboot+0x3a4/frame 0xfffffe009db49ac0
amd64_syscall() at amd64_syscall+0x12e/frame 0xfffffe009db49bf0
fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe009db49bf0
--- syscall (55, FreeBSD ELF64, sys_reboot), rip = 0x2dec6182dd5a, rsp =
0x7fffffb03f58, rbp = 0x7fffffb040d0 ---

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