Current mainline hangs in xfstests 073, which does heavy I/O on a loop device. Bisection points to "writeback: remove writeback_control.more_io" as a likely culprit. [ 516.140022] BUG: soft lockup - CPU#0 stuck for 22s! [flush-7:0:8553] [ 516.141854] Modules linked in: [ 516.143147] CPU 0 [ 516.143339] Modules linked in: [ 516.143339] [ 516.143339] Pid: 8553, comm: flush-7:0 Tainted: G W 3.0.0+ #173 Bochs Bochs [ 516.143339] RIP: 0010:[<ffffffff8116da70>] [<ffffffff8116da70>] __writeback_inodes_wb+0x50/0xc0 [ 516.143339] RSP: 0018:ffff88005768bcb0 EFLAGS: 00000246 [ 516.143339] RAX: 0000000000000000 RBX: ffff88005768bcb0 RCX: ffff88005a8e0a10 [ 516.143339] RDX: ffffffff00000002 RSI: ffff88005a8e0988 RDI: ffff88003e12e400 [ 516.143339] RBP: ffff88005768bcf0 R08: ffff88005768bcb0 R09: ffff88005a8e0a10 [ 516.143339] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 516.143339] R13: 0000000000000000 R14: ffff88005a8e0a10 R15: ffff88005768bca0 [ 516.143339] FS: 0000000000000000(0000) GS:ffff88005d800000(0000) knlGS:0000000000000000 [ 516.143339] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 516.143339] CR2: 00000000f7639b90 CR3: 000000001d249000 CR4: 00000000000006f0 [ 516.143339] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 516.143339] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 516.143339] Process flush-7:0 (pid: 8553, threadinfo ffff88005768a000, task ffff88005aae2340) [ 516.143339] Stack: [ 516.143339] ffff88005562dd80 000000010000fd67 ffffffffffffff10 ffff88005768bde8 [ 516.143339] ffff88005a8e0988 ffff8800588e5280 0000000000000000 ffff88005a8e0860 [ 516.143339] ffff88005768bd90 ffffffff8116de4b 7fffffffffffffff ffffffff8108598d [ 516.143339] Call Trace: [ 516.143339] [<ffffffff8116de4b>] wb_writeback+0x36b/0x390 [ 516.143339] [<ffffffff8108598d>] ? default_wake_function+0xd/0x10 [ 516.143339] [<ffffffff8110e9b5>] ? determine_dirtyable_memory+0x15/0x30 [ 516.143339] [<ffffffff8116ef4b>] wb_do_writeback+0x1fb/0x230 [ 516.143339] [<ffffffff81099d90>] ? destroy_timer_on_stack+0x10/0x20 [ 516.143339] [<ffffffff8116f004>] bdi_writeback_thread+0x84/0x2e0 [ 516.143339] [<ffffffff8116ef80>] ? wb_do_writeback+0x230/0x230 [ 516.143339] [<ffffffff810acc57>] kthread+0x87/0x90 [ 516.143339] [<ffffffff81a31e94>] kernel_thread_helper+0x4/0x10 [ 516.143339] [<ffffffff810acbd0>] ? kthread_worker_fn+0x1a0/0x1a0 [ 516.143339] [<ffffffff81a31e90>] ? gs_change+0xb/0xb [ 516.143339] Code: 75 df 00 48 83 c0 1e 48 89 45 c8 4c 39 b3 88 00 00 00 74 34 48 8b 93 90 00 00 00 4c 8b 62 b0 48 89 55 c0 4c 89 e7 e8 b0 b8 fd ff [ 516.143339] 8b 55 c0 84 c0 75 28 48 8d 7a 98 48 89 de e8 ac f6 ff ff 4c -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
