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Created attachment 513771 [details] lvm filter - vgs command Description of problem: case: running vgs command with specific filter reviles that vgs is stuck in D+ till timeout: enabled kernel logging and got the following: INFO: task lvm:9568 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. lvm D 0000000000000004 0 9568 9567 0x00000080 ffff8803894efb88 0000000000000082 0000000000000000 ffffffffa00040bc ffff8803ca012000 ffff8803dad85200 0000000000000001 00000001044f9add ffff8803874485f8 ffff8803894effd8 000000000000f598 ffff8803874485f8 Call Trace: [<ffffffffa00040bc>] ? dm_table_unplug_all+0x5c/0xd0 [dm_mod] [<ffffffff814db013>] io_schedule+0x73/0xc0 [<ffffffff811abe3e>] __blockdev_direct_IO+0x70e/0xc40 [<ffffffff811a9a87>] blkdev_direct_IO+0x57/0x60 [<ffffffff811a8c50>] ? blkdev_get_blocks+0x0/0xc0 [<ffffffff8110f0db>] generic_file_aio_read+0x6bb/0x700 [<ffffffff8120c531>] ? avc_has_perm+0x71/0x90 [<ffffffff8120605f>] ? security_inode_permission+0x1f/0x30 [<ffffffff811723ea>] do_sync_read+0xfa/0x140 [<ffffffff8108e100>] ? autoremove_wake_function+0x0/0x40 [<ffffffff811a901c>] ? block_ioctl+0x3c/0x40 [<ffffffff81184d92>] ? vfs_ioctl+0x22/0xa0 [<ffffffff81211a8b>] ? selinux_file_permission+0xfb/0x150 [<ffffffff81204ef6>] ? security_file_permission+0x16/0x20 [<ffffffff81172e15>] vfs_read+0xb5/0x1a0 [<ffffffff810d1ac2>] ? audit_syscall_entry+0x272/0x2a0 [<ffffffff81172f51>] sys_read+0x51/0x90 [<ffffffff8100b172>] system_call_fastpath+0x16/0x1b [root@rhev-a24c-01 ~]# INFO: task lvm:9568 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. lvm D 0000000000000004 0 9568 9567 0x00000080 ffff8803894efb88 0000000000000082 0000000000000000 ffffffffa00040bc ffff8803ca012000 ffff8803dad85200 0000000000000001 00000001044f9add ffff8803874485f8 ffff8803894effd8 000000000000f598 ffff8803874485f8 Call Trace: [<ffffffffa00040bc>] ? dm_table_unplug_all+0x5c/0xd0 [dm_mod] [<ffffffff814db013>] io_schedule+0x73/0xc0 [<ffffffff811abe3e>] __blockdev_direct_IO+0x70e/0xc40 [<ffffffff811a9a87>] blkdev_direct_IO+0x57/0x60 [<ffffffff811a8c50>] ? blkdev_get_blocks+0x0/0xc0 [<ffffffff8110f0db>] generic_file_aio_read+0x6bb/0x700 [<ffffffff8120c531>] ? avc_has_perm+0x71/0x90 [<ffffffff8120605f>] ? security_inode_permission+0x1f/0x30 [<ffffffff811723ea>] do_sync_read+0xfa/0x140 [<ffffffff8108e100>] ? autoremove_wake_function+0x0/0x40 [<ffffffff811a901c>] ? block_ioctl+0x3c/0x40 [<ffffffff81184d92>] ? vfs_ioctl+0x22/0xa0 [<ffffffff81211a8b>] ? selinux_file_permission+0xfb/0x150 [<ffffffff81204ef6>] ? security_file_permission+0x16/0x20 [<ffffffff81172e15>] vfs_read+0xb5/0x1a0 [<ffffffff810d1ac2>] ? audit_syscall_entry+0x272/0x2a0 [<ffffffff81172f51>] sys_read+0x51/0x90 [<ffffffff8100b172>] system_call_fastpath+0x16/0x1b INFO: task vgs:10339 blocked for more than 120 seconds. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. vgs D 0000000000000002 0 10339 30973 0x00000084 ffff8803834bbb88 0000000000000086 ffff8803834bbb48 ffffffffa00040bc ffff8803ca012000 ffff8803dad85200 0000000000000001 000000000000000c ffff88038b45e6b8 ffff8803834bbfd8 000000000000f598 ffff88038b45e6b8 Call Trace: [<ffffffffa00040bc>] ? dm_table_unplug_all+0x5c/0xd0 [dm_mod] [<ffffffff81098c99>] ? ktime_get_ts+0xa9/0xe0 [<ffffffff814db013>] io_schedule+0x73/0xc0 [<ffffffff811abe3e>] __blockdev_direct_IO+0x70e/0xc40 [<ffffffff811a9a87>] blkdev_direct_IO+0x57/0x60 [<ffffffff811a8c50>] ? blkdev_get_blocks+0x0/0xc0 [<ffffffff8110f0db>] generic_file_aio_read+0x6bb/0x700 [<ffffffff8120c531>] ? avc_has_perm+0x71/0x90 [<ffffffff8120605f>] ? security_inode_permission+0x1f/0x30 [<ffffffff811723ea>] do_sync_read+0xfa/0x140 [<ffffffff8108e100>] ? autoremove_wake_function+0x0/0x40 [<ffffffff811a901c>] ? block_ioctl+0x3c/0x40 [<ffffffff81184d92>] ? vfs_ioctl+0x22/0xa0 [<ffffffff81211a8b>] ? selinux_file_permission+0xfb/0x150 [<ffffffff81204ef6>] ? security_file_permission+0x16/0x20 [<ffffffff81172e15>] vfs_read+0xb5/0x1a0 [<ffffffff810d1ac2>] ? audit_syscall_entry+0x272/0x2a0 [<ffffffff81172f51>] sys_read+0x51/0x90 [<ffffffff8100b172>] system_call_fastpath+0x16/0x1b vgs 10339 root cwd DIR 253,0 4096 2228225 /root vgs 10339 root rtd DIR 253,0 4096 2 / vgs 10339 root txt REG 253,0 820456 2883630 /sbin/lvm vgs 10339 root mem REG 253,0 155696 2621834 /lib64/ld-2.12.so vgs 10339 root mem REG 253,0 22536 2621836 /lib64/libdl-2.12.so vgs 10339 root mem REG 253,0 1912928 2621835 /lib64/libc-2.12.so vgs 10339 root mem REG 253,0 21848 2621809 /lib64/libdevmapper-event.so.1.02 vgs 10339 root mem REG 253,0 124624 2621851 /lib64/libselinux.so.1 vgs 10339 root mem REG 253,0 271976 2621877 /lib64/libreadline.so.6.0 vgs 10339 root mem REG 253,0 248304 2621873 /lib64/libsepol.so.1 vgs 10339 root mem REG 253,0 138280 2621808 /lib64/libtinfo.so.5.7 vgs 10339 root mem REG 253,0 61504 2621523 /lib64/libudev.so.0.5.1 vgs 10339 root mem REG 253,0 158912 2621574 /lib64/libdevmapper.so.1.02 vgs 10339 root mem REG 253,0 99158752 788542 /usr/lib/locale/locale-archive vgs 10339 root mem REG 253,0 26050 788798 /usr/lib64/gconv/gconv-modules.cache vgs 10339 root 0u CHR 136,0 0t0 3 /dev/pts/0 vgs 10339 root 1u CHR 136,0 0t0 3 /dev/pts/0 vgs 10339 root 2u CHR 136,0 0t0 3 /dev/pts/0 vgs 10339 root 3u CHR 10,58 0t0 5640 /dev/mapper/control vgs 10339 root 4r BLK 253,256 0x27fff0000 173240 /dev/dm-256 repro steps: 1) host connected via FC to X devices 2) disconnect host from those devices 3) rescan bus 4) connect host to new devices 5) rescan bus 6) multipath returns fine 7) running vgs command: see attached file