[Bug 235439] sync(8) hanged in D+ state after more swap space was added

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=235439

--- Comment #2 from Yuri Victorovich <yuri at freebsd.org> ---
(In reply to Andriy Gapon from comment #1)

> What was a filesystem for that swap file?

The newly added swap file is on zfs. The previously existed swap file is on
ufs.

> $ procstat -kk 40832
>   PID    TID COMM                TDNAME              KSTACK                       
> 40832 101728 sync                -                   mi_switch+0xe6 sleepq_wait+0x2c _cv_wait+0x16e txg_wait_synced+0xa5 dmu_tx_assign+0x48 zil_commit_impl+0x8e zfs_sync+0xa6 sys_sync+0x116 amd64_syscall+0xa38 fast_syscall_common+0x101 
> $ procstat -kk 88582
>   PID    TID COMM                TDNAME              KSTACK                       
> 88582 103868 sync                -                   mi_switch+0xe6 sleepq_wait+0x2c _cv_wait+0x16e txg_wait_synced+0xa5 dmu_tx_assign+0x48 zil_commit_impl+0x8e zfs_sync+0xa6 sys_sync+0x116 amd64_syscall+0xa38 fast_syscall_common+0x101

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