Date: Sun, 25 Oct 2020 10:06:29 +0000 From: Jon Schneider <freebsd@jschneider.net> To: Christos Chatzaras <chris@cretaforce.gr> Cc: freebsd-questions@freebsd.org Subject: Re: PHP-FPM processes hang in UFS-state Message-ID: <650EF24A-7444-41BA-AAF1-EC9930F25710@jschneider.net> In-Reply-To: <675E2CFF-C45D-48C2-8E55-4E9876D5098A@cretaforce.gr> References: <675E2CFF-C45D-48C2-8E55-4E9876D5098A@cretaforce.gr>
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I think this might be a job for DTrace which I don’t know enough to exactly what to do but you probably want to trace use of all those functions you see in your traces and everything in UFS. Hint: do not send DTrace output to something on UFS ! You might also want to create a smaller test case to induce the problem quickly. Be interesting to hear what you discover. Jon > On 24 Oct 2020, at 13:28, Christos Chatzaras <chris@cretaforce.gr> wrote: > > This issue happened in 3 different servers the last months. > > Some PHP-FPM processes hang in UFS-state. > > The websites that cause the hang are all Prestashop and it's related to their var/cache files (I believe it happens when they clear the cache and the files are regenerated). > > > This is a php-fpm process that hang: > > procstat -kk 73548 > > PID TID COMM TDNAME KSTACK > 73548 100630 php-fpm - mi_switch+0xe2 sleepq_wait+0x2c sleeplk+0x185 lockmgr_xlock_hard+0x1f5 __lockmgr_args+0x2bf ffs_lock+0xa5 VOP_LOCK1_APV+0x7c _vn_lock+0x44 vget+0x4a vfs_hash_get+0xb0 ffs_vgetf+0x3f softdep_sync_buf+0xbee ffs_syncvnode+0x26f ffs_truncate+0x71b ufs_direnter+0x5f8 ufs_makeinode+0x5fb ufs_create+0x34 VOP_CREATE_APV+0x76 > > > procstat -kk -a : > > https://www.coderz.gr/ufs/procstat.txt > > > mount | grep home : > > https://www.coderz.gr/ufs/mount.txt > > > dumpfs /dev/mirror/gm0p7 : > > https://www.coderz.gr/ufs/dumpfs.txt > > > I have to force reboot the server as /home is not possible to clean unmount. Then I run fsck which fixes some issues because of the unclean reboot. Then I run fsck again that shows no errors. Then I mount /home and first rename the cache folders and finally delete var/cache and allow it to regenerate prestashop files. But the same issue happens again after few days. > > > Any idea how to troubleshoot it? > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org" >help
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