Re: linux 5.12 - fails to boot - soft lockup - CPU#0 stuck for 23s! - RIP smp_call_function_single

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$ git bisect bad
7c70f3a7488d2fa62d32849d138bf2b8420fe788 is the first bad commit
commit 7c70f3a7488d2fa62d32849d138bf2b8420fe788
Merge: 20bf195e9391 4d12b7275386
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date:   Mon Feb 22 13:29:55 2021 -0800

    Merge tag 'nfsd-5.12-1' of git://

    Pull more nfsd updates from Chuck Lever:
     "Here are a few additional NFSD commits for the merge window:

       - Cork the socket while there are queued replies

       - DRC shutdown ordering
       - svc_rdma_accept() lockdep splat"

    * tag 'nfsd-5.12-1' of git://
      SUNRPC: Further clean up svc_tcp_sendmsg()
      SUNRPC: Remove redundant socket flags from svc_tcp_sendmsg()
      SUNRPC: Use TCP_CORK to optimise send performance on the server
      svcrdma: Hold private mutex while invoking rdma_accept()
      nfsd: register pernet ops last, unregister first

 fs/nfsd/nfsctl.c                         | 14 ++++++-------
 include/linux/sunrpc/svcsock.h           |  2 ++
 net/sunrpc/svcsock.c                     | 35 ++++++++++++++++----------------
 net/sunrpc/xprtrdma/svc_rdma_transport.c |  6 +++---
 4 files changed, 29 insertions(+), 28 deletions(-)


There is a small chance that this bisect is not precise, because sometimes the system can boot to a temporarily working state, then lock-up after a short time.  I did not test every successful initial boot extensively.

This particular commit does not produce the same "watchdog: BUG: soft lockup" log message.  Instead, after sometimes - mostly not - booting to an Xorg display, the system just completely freezes, with not so much as the system log still working.

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