[Bug 209158] node / npm triggering zfs rename deadlock

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209158

--- Comment #13 from Doug Luce <doug at freebsd.con.com> ---
Running the patch give me this on bootup:

kernel: lock order reversal:
kernel: 1st 0xfffffe00f766fba0 bufwait (bufwait) @
/usr/src/sys/kern/vfs_bio.c:3512
kernel: 2nd 0xfffff800141e0200 dirhash (dirhash) @
/usr/src/sys/ufs/ufs/ufs_dirhash.c:281
kernel: stack backtrace:
kernel: #0 0xffffffff80a76bc3 at witness_debugger+0x73
kernel: #1 0xffffffff80a76ac3 at witness_checkorder+0xea3
kernel: #2 0xffffffff80a21cc5 at _sx_xlock+0x75
kernel: #3 0xffffffff80cd5ded at ufsdirhash_move+0x3d
kernel: #4 0xffffffff80cd831d at ufs_direnter+0x35d
kernel: #5 0xffffffff80ce08a1 at ufs_mkdir+0x8b1
kernel: #6 0xffffffff80fd2e67 at VOP_MKDIR_APV+0xf7
kernel: #7 0xffffffff80ae3b09 at kern_mkdirat+0x209
kernel: #8 0xffffffff80e7d2ae at amd64_syscall+0x2de
kernel: #9 0xffffffff80e5da1b at Xfast_syscall+0xfb


A bit later on:

kernel: acquiring duplicate lock of same type: "kqueue"
kernel: 1st kqueue @ /usr/src/sys/kern/kern_event.c:2026
kernel: 2nd kqueue @ /usr/src/sys/kern/subr_taskqueue.c:282
kernel: stack backtrace:
kernel: #0 0xffffffff80a76bc3 at witness_debugger+0x73
kernel: #1 0xffffffff80a76ac3 at witness_checkorder+0xea3
kernel: #2 0xffffffff809fb2b8 at __mtx_lock_flags+0xa8
kernel: #3 0xffffffff80a6945f at taskqueue_enqueue+0x3f
kernel: #4 0xffffffff809d04f9 at knote_enqueue+0x119
kernel: #5 0xffffffff809d28c1 at knote+0x1c1
kernel: #6 0xffffffff80ad9843 at vop_rename_post+0x143
kernel: #7 0xffffffff80fd2d3b at VOP_RENAME_APV+0x13b
kernel: #8 0xffffffff80ae3896 at kern_renameat+0x4a6
kernel: #9 0xffffffff80e7d2ae at amd64_syscall+0x2de
kernel: #10 0xffffffff80e5da1b at Xfast_syscall+0xfb

and the machine locks up.

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