Dear David, I don't know if it is completely related to fscache but today I found was of my server in a bad shape with the following stack-trace in the kern.log : [336115.332070] ------------[ cut here ]------------ [336115.332102] kernel BUG at /usr/src/linux-2.6-2.6.33/debian/build/source_i386_none/lib/radix-tree.c:602! [336115.332154] invalid opcode: 0000 [#1] SMP [336115.332186] last sysfs file: /sys/devices/virtual/block/md1/md/mismatch_cnt [336115.332216] CPU 5 [336115.332239] Pid: 19372, comm: lighttpd Tainted: G B 2.6.33-2-amd64 #1 0P010H/PowerEdge M600 [336115.332287] RIP: 0010:[<ffffffff81182040>] [<ffffffff81182040>] radix_tree_tag_get+0xbc/0xe3 [336115.332341] RSP: 0018:ffff8800cfcc1c28 EFLAGS: 00210202 [336115.332367] RAX: 0000000000000001 RBX: 000000000000003f RCX: 0000000000000000 [336115.332411] RDX: 000000000000003f RSI: 0000000000000001 RDI: ffff880347d253b0 [336115.332454] RBP: ffff880347d253b0 R08: 0000000000000efe R09: 0000000000000000 [336115.332498] R10: 0000000000000001 R11: ffffffffa0350cf6 R12: 0000000000000001 [336115.332541] R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000eff [336115.332585] FS: 0000000000000000(0000) GS:ffff88000ff40000(0063) knlGS:00000000f731b6d0 [336115.332630] CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b [336115.332667] CR2: 0000000009652000 CR3: 00000001a601f000 CR4: 00000000000006e0 [336115.332710] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [336115.332758] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [336115.332807] Process lighttpd (pid: 19372, threadinfo ffff8800cfcc0000, task ffff8803e4307000) [336115.332852] Stack: [336115.332872] 0000000100000001 ffff88042c586850 ffffea0001b620c8 00000000000000d0 [336115.332906] <0> ffff88042c586820 000000000000000b ffff8800cfcc1d50 ffffffffa0247b67 [336115.332957] <0> 0000000200000002 ffff88042c586820 ffffea0001b620c8 00000000000000d0 [336115.333025] Call Trace: [336115.333052] [<ffffffffa0247b67>] ? __fscache_maybe_release_page+0x42/0x115 [fscache] [336115.333116] [<ffffffffa0372e7d>] ? nfs_fscache_release_page+0x66/0x99 [nfs] [336115.333148] [<ffffffff810b6dee>] ? invalidate_inode_pages2_range+0x15a/0x262 [336115.333197] [<ffffffffa035312f>] ? nfs_invalidate_mapping_nolock+0x18/0xb4 [nfs] [336115.333246] [<ffffffffa0354097>] ? nfs_revalidate_mapping+0x85/0x99 [nfs] [336115.333273] [<ffffffffa0351158>] ? nfs_file_splice_read+0x5b/0x8e [nfs] [336115.333273] [<ffffffff811043d3>] ? splice_direct_to_actor+0xbe/0x188 [336115.333273] [<ffffffff81104a1c>] ? direct_splice_actor+0x0/0x1e [336115.333273] [<ffffffff81113274>] ? ep_scan_ready_list+0x132/0x151 [336115.333273] [<ffffffff811044e7>] ? do_splice_direct+0x4a/0x64 [336115.333273] [<ffffffff810e8fa8>] ? do_sendfile+0x12d/0x1a8 [336115.333273] [<ffffffff8106685b>] ? getnstimeofday+0x55/0xaf [336115.333273] [<ffffffff810e906c>] ? sys_sendfile64+0x49/0x88 [336115.333273] [<ffffffff8103145f>] ? sysenter_dispatch+0x7/0x2e [336115.333273] Code: 00 00 44 0f 44 f0 41 83 fc 01 75 23 8b 74 24 04 89 da 48 89 ef e8 be fb ff ff 85 c0 0f 95 c0 0f b6 c0 85 c0 74 1f 45 85 f6 74 1a <0f> 0b eb fe 48 63 c3 41 83 ed 06 41 ff cc 48 8d 44 c5 18 48 8b [336115.333273] RIP [<ffffffff81182040>] radix_tree_tag_get+0xbc/0xe3 [336115.333273] RSP <ffff8800cfcc1c28> [336115.334487] ---[ end trace 2da6bc1f424cd8a1 ]--- The lighttpd process (which is the one accessing file over nfs cached by fscache) was stalled and impossible to kill. I had to reboot the server. Maybe it rings a bell to you ? Regards, -- RD -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
