Hi,
When running xfstests with 4K blocksize, test 204 (Test out ENOSPC
flushing on small filesystems)
hangs in an interruptible sleep (I can release it with ctrl-C).
git bisect points at commit fc0d5c38963ed655e974025c63290563c172038a
ext4: add flag to ext4_has_free_blocks
as the offender.
Following is the stack dump of hung tasks (immediately after running test 204):
[ 406.974191] SysRq : Show Blocked State
[ 406.974198] task PC stack pid father
[ 406.974234] 204 D ffff88010b763148 0 2002 1797 0x00000000
[ 406.974239] ffff880109621bd8 0000000000000082 ffff880100000000
0000000300000001
[ 406.974243] ffff880109621b78 ffff880109621fd8 ffff880109620000
ffff880109621fd8
[ 406.974247] ffff880128f34470 ffff88010b762da0 ffff880109621bd8
0000000181084ec0
[ 406.974250] Call Trace:
[ 406.974260] [<ffffffff81241d05>] jbd2_log_wait_commit+0xb5/0x130
[ 406.974264] [<ffffffff81084c10>] ? wake_up_bit+0x40/0x40
[ 406.974267] [<ffffffff81243c26>] ? __jbd2_log_start_commit+0x96/0xa0
[ 406.974270] [<ffffffff81243d6b>] jbd2_journal_force_commit_nested+0x5b/0xa0
[ 406.974274] [<ffffffff811f3f1f>] ext4_should_retry_alloc+0x5f/0x70
[ 406.974277] [<ffffffff81205c5b>] ext4_create+0x11b/0x140
[ 406.974281] [<ffffffff8116c101>] vfs_create+0xb1/0x110
[ 406.974284] [<ffffffff8116c796>] do_last+0x636/0x960
[ 406.974287] [<ffffffff8116cc4b>] path_openat+0xcb/0x3c0
[ 406.974290] [<ffffffff8116cf82>] do_filp_open+0x42/0xa0
[ 406.974293] [<ffffffff81179707>] ? alloc_fd+0xf7/0x150
[ 406.974297] [<ffffffff8115d1a1>] do_sys_open+0x101/0x1d0
[ 406.974299] [<ffffffff8115d290>] sys_open+0x20/0x30
[ 406.974304] [<ffffffff815ad242>] system_call_fastpath+0x16/0x1b
[ 406.974306] jbd2/sda8-8 D ffff88010f1ac818 0 2167 2 0x00000000
[ 406.974309] ffff88010d3a9bc0 0000000000000046 ffff880100000000
ffffffff81109a89
[ 406.974313] ffff880109fd2958 ffff88010d3a9fd8 ffff88010d3a8000
ffff88010d3a9fd8
[ 406.974317] ffffffff81a0b020 ffff88010f1ac470 ffff88010d3a9b90
000000012fc13fc0
[ 406.974320] Call Trace:
[ 406.974324] [<ffffffff81109a89>] ? mempool_alloc+0x59/0x140
[ 406.974328] [<ffffffff8118aa20>] ? __wait_on_buffer+0x30/0x30
[ 406.974332] [<ffffffff815a2c1c>] io_schedule+0x8c/0xd0
[ 406.974334] [<ffffffff8118aa2e>] sleep_on_buffer+0xe/0x20
[ 406.974338] [<ffffffff815a36ef>] __wait_on_bit+0x5f/0x90
[ 406.974341] [<ffffffff8118aa20>] ? __wait_on_buffer+0x30/0x30
[ 406.974343] [<ffffffff815a379c>] out_of_line_wait_on_bit+0x7c/0x90
[ 406.974347] [<ffffffff81084c50>] ? autoremove_wake_function+0x40/0x40
[ 406.974350] [<ffffffff8118aa1e>] __wait_on_buffer+0x2e/0x30
[ 406.974353] [<ffffffff8123e70d>]
jbd2_journal_commit_transaction+0x140d/0x1580
[ 406.974357] [<ffffffff8100a6e0>] ? __switch_to+0xc0/0x2f0
[ 406.974360] [<ffffffff81241e4b>] kjournald2+0xbb/0x220
[ 406.974363] [<ffffffff81084c10>] ? wake_up_bit+0x40/0x40
[ 406.974366] [<ffffffff81241d90>] ? commit_timeout+0x10/0x10
[ 406.974369] [<ffffffff81084476>] kthread+0x96/0xa0
[ 406.974372] [<ffffffff815ae364>] kernel_thread_helper+0x4/0x10
[ 406.974375] [<ffffffff810843e0>] ? flush_kthread_worker+0xb0/0xb0
[ 406.974378] [<ffffffff815ae360>] ? gs_change+0x13/0x13
Amir.
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