I've run shared/313 (posted here http://patchwork.ozlabs.org/patch/244297) And have got following bugon( BUG_ON(!PageLocked()) I think this also will be reproducible via shared/305 Currently I try to bisect this issue. ------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:1458! invalid opcode: 0000 [#1] SMP Modules linked in: dm_flakey tun cpufreq_ondemand acpi_cpufreq freq_table mperf coretemp kvm_intel kvm crc32c_intel ghash_clmulni_intel microcode sg xhci_hcd button sd_mod crc_t10dif aesni_intel ablk_helper cryptd lrw gf128mul glue_helper aes_x86_64 ahci libahci pata_acpi ata_generic dm_mirror dm_region_hash dm_log dm_mod CPU: 2 PID: 12142 Comm: hwflush-check Tainted: G W 3.10.0-rc2+ #78 Hardware name: /DQ67SW, BIOS SWQ6710H.86A.0052.2011.0520.1802 05/20/2011 task: ffff8801c8a6cdc0 ti: ffff8802296f2000 task.ti: ffff8802296f2000 RIP: 0010:[<ffffffff81315cf7>] [<ffffffff81315cf7>] mpage_release_unused_pages+0x197/0x280 RSP: 0018:ffff8802296f3c08 EFLAGS: 00010202 RAX: 0000000000000003 RBX: ffffea0004332ad8 RCX: 00000000001d025f RDX: 0000000000000001 RSI: 0000000000000001 RDI: ffffffff82136dc0 RBP: ffff8802296f3ce8 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000001 R11: 0000000000000003 R12: 0000000000000002 R13: ffff8802296f3c38 R14: 0000000000000000 R15: 0000000000000001 FS: 00007f8c0dffb700(0000) GS:ffff88023d800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8bac003000 CR3: 000000022a1a6000 CR4: 00000000000407e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Stack: 0000000000000000 ffff8802296f3c48 ffff8801a92d8aa0 0000000000000004 00000000000005e6 ffff8802296f3c48 0000000000000004 0000000000000000 ffffea0004332ad8 ffffea0004332b10 ffffea0004332b48 ffffea0006dd0000 Call Trace: [<ffffffff81193c47>] ? mempool_free_slab+0x17/0x20 [<ffffffff81193d55>] ? mempool_free+0xe5/0x100 [<ffffffff8127bca0>] ? bio_put+0xe0/0xf0 [<ffffffff8131bcc4>] ext4_da_writepages+0x684/0x910 [<ffffffff810f56be>] ? __lock_acquire+0x4fe/0x5c0 [<ffffffff811a3071>] do_writepages+0x51/0x70 [<ffffffff8118f464>] __filemap_fdatawrite_range+0x64/0x70 [<ffffffff810f5e4a>] ? __lock_rele [<ffffffff81270288>] do_fsync+0x58/0xa0 [<ffffffff81270300>] SyS_fsync+0x10/0x20 [<ffffffff818d5c82>] system_call_fastpath+0x16/0x1b Code: 83 f7 01 44 89 fe e8 f9 56 e5 ff 49 63 c7 48 83 c0 02 48 8b 14 c5 f0 f1 2a 82 48 83 c2 01 45 85 ff 48 89 14 c5 EXT4-fs (dm-1): mounted filesystem with ordered data mode. Opts: acl,user_xattr -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html