On Feb03 20:40, Michal Hocko wrote: > What does /proc/<ps pid>/stack say? Thanks for the hint. forgot to have a look; seems to be a nfs issue: [<ffffffff810eda29>] sleep_on_page+0x9/0x20 [<ffffffff810ee8d4>] __lock_page+0xa4/0xb0 [<ffffffff810fe38f>] truncate_inode_pages_range+0x3ef/0x6a0 [<ffffffff810fe650>] truncate_inode_pages+0x10/0x20 [<ffffffff812474b6>] nfs4_evict_inode+0x16/0x40 [<ffffffff8117359f>] evict+0xaf/0x1c0 [<ffffffff811744c2>] iput+0x102/0x1a0 [<ffffffff812178d5>] nfs_dentry_iput+0x35/0x50 [<ffffffff8116f36c>] dentry_kill+0x16c/0x290 [<ffffffff8116f9d8>] dput+0xa8/0x160 [<ffffffff8121c96b>] __put_nfs_open_context+0xbb/0x100 [<ffffffff8121d1bb>] put_nfs_open_context+0xb/0x20 [<ffffffff81229ea4>] nfs_commitdata_release+0x14/0x30 [<ffffffff81229ee7>] nfs_commit_release+0x27/0x30 [<ffffffff815d23d2>] rpc_free_task+0x32/0x80 [<ffffffff815d24a5>] rpc_final_put_task+0x85/0x90 [<ffffffff815d2505>] rpc_do_put_task+0x35/0x40 [<ffffffff815d320b>] rpc_put_task+0xb/0x20 [<ffffffff81229fd0>] nfs_initiate_commit+0xe0/0x120 [<ffffffff8122a269>] nfs_commit_list+0x69/0xb0 [<ffffffff8122a36b>] nfs_commit_inode+0x9b/0x160 [<ffffffff8121b02b>] nfs_release_page+0x7b/0xa0 [<ffffffff810f18dd>] try_to_release_page+0x3d/0x60 [<ffffffff81100b06>] shrink_page_list+0x8a6/0x9e0 [<ffffffff81101233>] shrink_inactive_list+0x183/0x420 [<ffffffff81101b45>] shrink_lruvec+0x335/0x6f0 [<ffffffff81101f66>] shrink_zone+0x66/0x1a0 [<ffffffff8110217b>] do_try_to_free_pages+0xdb/0x550 [<ffffffff81102764>] try_to_free_mem_cgroup_pages+0xa4/0xb0 [<ffffffff8114851e>] mem_cgroup_reclaim+0x4e/0xd0 [<ffffffff81148e29>] __mem_cgroup_try_charge+0x409/0xbf0 [<ffffffff81149d85>] mem_cgroup_charge_common+0x45/0xa0 [<ffffffff8114c1d6>] mem_cgroup_newpage_charge+0x26/0x30 [<ffffffff811181a8>] handle_mm_fault+0x8c8/0xcf0 [<ffffffff810342a3>] __do_page_fault+0x1b3/0x600 [<ffffffff8103472c>] do_page_fault+0xc/0x20 [<ffffffff81609572>] page_fault+0x22/0x30 [<ffffffffffffffff>] 0xffffffffffffffff -- William
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