kdebug> bt
stack trace for thread 322 "mount_server"
    kernel stack: 0xffffffff81b37000 to 0xffffffff81b3c000
      user stack: 0x00007ffee5a8b000 to 0x00007ffee6a8b000
frame                       caller             <image>:function + offset
 0 ffffffff81b3b868 (+  32) ffffffff800b0489   <kernel_x86_64> invoke_command_trampoline(void*) + 0x19
 1 ffffffff81b3b888 (+  24) ffffffff8014d20c   <kernel_x86_64> arch_debug_call_with_fault_handler + 0x16
 2 ffffffff81b3b8a0 (+  80) ffffffff800ad4d8   <kernel_x86_64> debug_call_with_fault_handler + 0x68
 3 ffffffff81b3b8f0 (+  96) ffffffff800b071f   <kernel_x86_64> invoke_debugger_command + 0xef
 4 ffffffff81b3b950 (+  64) ffffffff800b0896   <kernel_x86_64> invoke_pipe_segment(debugger_command_pipe*, int, char*) + 0xf6
 5 ffffffff81b3b990 (+  80) ffffffff800b099c   <kernel_x86_64> invoke_debugger_command_pipe + 0xac
 6 ffffffff81b3b9e0 (+  96) ffffffff800b5160   <kernel_x86_64> ExpressionParser::_ParseCommandPipe(int&) + 0x120
 7 ffffffff81b3ba40 (+  96) ffffffff800bab5e   <kernel_x86_64> ExpressionParser::EvaluateCommand(char const*, int&) + 0x30e
 8 ffffffff81b3baa0 (+ 240) ffffffff800bd5be   <kernel_x86_64> evaluate_debug_command + 0x11e
 9 ffffffff81b3bb90 (+  96) ffffffff800aef40   <kernel_x86_64> kernel_debugger_loop(char const*, char const*, __va_list_tag*, int) + 0x1b0
10 ffffffff81b3bbf0 (+  80) ffffffff800af18e   <kernel_x86_64> kernel_debugger_internal(char const*, char const*, __va_list_tag*, int) + 0x6e
11 ffffffff81b3bc40 (+ 256) ffffffff800af4f2   <kernel_x86_64> panic + 0xb2
12 ffffffff81b3bd40 (+  80) ffffffff80124306   <kernel_x86_64> delete_object_cache_internal(ObjectCache*) + 0x66
13 ffffffff81b3bd90 (+  32) ffffffff80048982   <kernel_x86_64> _GLOBAL__N_1::block_cache::~block_cache() + 0x62
14 ffffffff81b3bdb0 (+ 112) ffffffff8004f3e6   <kernel_x86_64> block_cache_delete + 0x2f6
15 ffffffff81b3be20 (+  32) ffffffff816b7c4e   <bfs> Volume::Unmount() + 0x8e
16 ffffffff81b3be40 (+  32) ffffffff816ba3ce   <bfs> bfs_unmount(fs_volume*) + 0x13
17 ffffffff81b3be60 (+ 112) ffffffff80105882   <kernel_x86_64> fs_unmount(char*, int, unsigned int, bool) + 0x392
18 ffffffff81b3bed0 (+  80) ffffffff8010aad6   <kernel_x86_64> _user_unmount + 0x86
19 ffffffff81b3bf20 (+  16) ffffffff8014ebd8   <kernel_x86_64> x86_64_syscall_entry + 0xfb
user iframe at 0xffffffff81b3bf30 (end = 0xffffffff81b3bff8)
 rax 0x63                  rbx 0x7ffee6a89d70        rcx 0x1f5aa57c1e4
 rdx 0x20781f39360         rsi 0x0                   rdi 0x1add1bc0
 rbp 0x7ffee6a89e30         r8 0x7fd                  r9 0x31761004
 r10 0x1f5aa57c521         r11 0x3246                r12 0x0
 r13 0x7ffee6a89e60        r14 0x0                   r15 0x7ffee6a89e60
 rip 0x1f5aa57c1e4         rsp 0x7ffee6a89d68     rflags 0x3246
 vector: 0x63, error code: 0x0
20 ffffffff81b3bf30 (+140734887157504) 000001f5aa57c1e4   <libroot.so> _kern_unmount + 0x0c
21 00007ffee6a89e30 (+ 144) 000001b493266fd4   <_APP_> AutoMounter::_UnmountAndEjectVolume(BPartition*, BPath&, char const*) + 0x54
22 00007ffee6a89ec0 (+ 528) 000001b49326733e   <_APP_> AutoMounter::_UnmountAndEjectVolume(BMessage*) + 0x1ce
23 00007ffee6a8a0d0 (+ 176) 000001b493267a95   <_APP_> AutoMounter::MessageReceived(BMessage*) + 0x1c5
24 00007ffee6a8a180 (+ 592) 0000020781b58c3b   <libbe.so> BApplication::DispatchMessage(BMessage*, BHandler*) + 0xfb
25 00007ffee6a8a3d0 (+  80) 0000020781b60834   <libbe.so> BLooper::task_looper() + 0x284
26 00007ffee6a8a420 (+  32) 0000020781b55c91   <libbe.so> BApplication::Run() + 0x21
27 00007ffee6a8a440 (+ 640) 000001b493265705   <_APP_> main + 0x25
28 00007ffee6a8a6c0 (+  48) 000001b49326583e   <_APP_> _start + 0x3e
29 00007ffee6a8a6f0 (+  48) 0000019734c236d2   </boot/system/runtime_loader@0x0000019734c0f000> <unknown> + 0x146d2
30 00007ffee6a8a720 (+   0) 00007f21af111260   <commpage> commpage_thread_exit + 0x00