* Theodore Ts'o (tytso@xxxxxxx) wrote: > On Mon, Aug 14, 2023 at 09:02:53PM +0000, Dr. David Alan Gilbert wrote: > > dg 29594 29592 0 18:40 pts/0 00:00:00 /usr/bin/ar --plugin /usr/libexec/gcc/x86_64-redhat-linux/13/liblto_plugin.so -csrDT src/intel/perf/libintel_perf.a src/intel/perf/libintel_perf.a.p/meson-generated_.._intel_perf_metrics.c.o src/intel/perf/libintel_perf.a.p/intel_perf.c.o src/intel/perf/libintel_perf.a.p/intel_perf_query.c.o src/intel/perf/libintel_perf.a.p/intel_perf_mdapi.c.o > > > > [root@dalek dg]# cat /proc/29594/stack > > [<0>] md_super_wait+0xa2/0xe0 > > [<0>] md_bitmap_unplug+0xd2/0x120 > > [<0>] flush_bio_list+0xf3/0x100 [raid1] > > [<0>] raid1_unplug+0x3b/0xb0 [raid1] > > [<0>] __blk_flush_plug+0xd7/0x150 > > [<0>] blk_finish_plug+0x29/0x40 > > [<0>] ext4_do_writepages+0x401/0xc90 > > [<0>] ext4_writepages+0xad/0x180 > > If you want a few seconds and try grabbing cat /proc/29594/stack > again, what does the stack trace stay consistent as above? I'll get back to that and retry it. > Also, if you have iostat installed (usually part of the sysstat > package), does "iostat 1" show any I/O activity on the md device? > What about the underying block dvices used by the md device? If the > md device is attached to HDD's where you can see the activity light, > can you see (or hear) any disk activity? It's spinning rust, and I hear them go quiet when the hang happens. Dave > This sure seems like either the I/O driver isn't processing requests, > or some kind of hang in the md layer.... > > - Ted -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux | Happy \ \ dave @ treblig.org | | In Hex / \ _________________________|_____ http://www.treblig.org |_______/
