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SubjectRe: [lkp] [directio] 15c4f638f3: WARNING: CPU: 3 PID: 8363 at kernel/sched/core.c:7533 __might_sleep+0x9f/0xb0()
Date
Jens Axboe <axboe@fb.com> writes:

> On 11/10/2015 10:21 PM, kernel test robot wrote:
>> FYI, we noticed the below changes on
>>
>> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> commit 15c4f638f3d41bae52105ca4c0c8760afbcbeaab ("directio: add block polling support")
>>
>>
>> +-------------------------------------------------+------------+------------+
>> | | a0fa9647a5 | 15c4f638f3 |
>> +-------------------------------------------------+------------+------------+
>> | boot_successes | 16 | 17 |
>> | boot_failures | 0 | 12 |
>> | WARNING:at_kernel/sched/core.c:#__might_sleep() | 0 | 11 |
>> | backtrace:vfs_read | 0 | 3 |
>> | backtrace:SyS_read | 0 | 3 |
>> | BUG:kernel_test_crashed | 0 | 1 |
>> +-------------------------------------------------+------------+------------+
>>
>>
>> [ 32.952193] BTRFS: creating UUID tree
>> [ 53.739325] random: nonblocking pool is initialized
>> [ 151.793376] ------------[ cut here ]------------
>> [ 151.794683] WARNING: CPU: 3 PID: 8363 at kernel/sched/core.c:7533 __might_sleep+0x9f/0xb0()
>> [ 151.796521] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff8122522b>] do_blockdev_direct_IO+0x126b/0x2c20
>> [ 151.798498] Modules linked in: btrfs xor raid6_pq dm_mod
>> rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom
>> ata_generic pata_acpi ppdev snd_pcm snd_timer snd soundcore
>> serio_raw pcspkr parport_pc parport floppy acpi_cpufreq ata_piix
>> libata i2c_piix4
>> [ 151.804351] CPU: 3 PID: 8363 Comm: dd Not tainted 4.3.0-06686-g15c4f63 #1
>> [ 151.805524] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Debian-1.8.2-1 04/01/2014
>> [ 151.806800] ------------[ cut here ]------------
>> [ 151.806820] WARNING: CPU: 0 PID: 8412 at kernel/sched/core.c:7533 __might_sleep+0x9f/0xb0()
>> [ 151.806824] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff8122522b>] do_blockdev_direct_IO+0x126b/0x2c20
>> [ 151.806834] Modules linked in: btrfs xor raid6_pq dm_mod
>> rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom
>> ata_generic pata_acpi ppdev snd_pcm snd_timer snd soundcore
>> serio_raw pcspkr parport_pc parport floppy acpi_cpufreq ata_piix
>> libata i2c_piix4
>> [ 151.815996] ffffffff81b9a8e8 ffff88003ef738d0 ffffffff81409c82 ffff88003ef73918
>> [ 151.817824] ffff88003ef73908 ffffffff81078f56 ffffffff81b91568 00000000000004a7
>> [ 151.819567] ------------[ cut here ]------------
>> [ 151.819573] WARNING: CPU: 2 PID: 8435 at kernel/sched/core.c:7533 __might_sleep+0x9f/0xb0()
>> [ 151.819576] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff8122522b>] do_blockdev_direct_IO+0x126b/0x2c20
>> [ 151.819589] Modules linked in: btrfs xor raid6_pq dm_mod
>> rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver sg sr_mod cdrom
>> ata_generic pata_acpi ppdev snd_pcm snd_timer snd soundcore
>> serio_raw pcspkr parport_pc parport floppy acpi_cpufreq ata_piix
>> libata i2c_piix4
>> [ 151.828384] 0000000000000000 ffff88003ef73a48 ffff88007ddb0000 ffff88003ef73968
>> [ 151.830244] Call Trace:
>> [ 151.830953] [<ffffffff81409c82>] dump_stack+0x4b/0x69
>> [ 151.831946] [<ffffffff81078f56>] warn_slowpath_common+0x86/0xc0
>> [ 151.832969] [<ffffffff81078fdc>] warn_slowpath_fmt+0x4c/0x50
>> [ 151.833976] [<ffffffff8122522b>] ? do_blockdev_direct_IO+0x126b/0x2c20
>> [ 151.835088] [<ffffffff8122522b>] ? do_blockdev_direct_IO+0x126b/0x2c20
>> [ 151.836195] [<ffffffff8109da9f>] __might_sleep+0x9f/0xb0
>> [ 151.837169] [<ffffffff81063d2a>] __do_page_fault+0x15a/0x410
>> [ 151.838166] [<ffffffff810640a3>] trace_do_page_fault+0x43/0x110
>> [ 151.839214] [<ffffffff8105d76a>] do_async_page_fault+0x1a/0xa0
>> [ 151.840268] [<ffffffff818bd3f8>] async_page_fault+0x28/0x30
>> [ 151.841260] [<ffffffff81225257>] ? do_blockdev_direct_IO+0x1297/0x2c20
>> [ 151.842420] [<ffffffffa0273300>] ? btrfs_page_exists_in_range+0xe0/0xe0 [btrfs]
>> [ 151.843956] [<ffffffffa026cdc0>] ? finish_ordered_fn+0x20/0x20 [btrfs]
>> [ 151.845034] [<ffffffff81226c23>] __blockdev_direct_IO+0x43/0x50
>> [ 151.846082] [<ffffffffa026cdc0>] ? finish_ordered_fn+0x20/0x20 [btrfs]
>> [ 151.847191] [<ffffffffa026646a>] btrfs_direct_IO+0x1aa/0x310 [btrfs]
>> [ 151.848255] [<ffffffffa026cdc0>] ? finish_ordered_fn+0x20/0x20 [btrfs]
>> [ 151.849372] [<ffffffff8116ccb8>] generic_file_read_iter+0x488/0x5b0
>> [ 151.850466] [<ffffffff8117b1b7>] ? lru_cache_add_active_or_unevictable+0x27/0x90
>> [ 151.852036] [<ffffffff811e6697>] __vfs_read+0xa7/0xd0
>> [ 151.852960] [<ffffffff811e6c86>] vfs_read+0x86/0x130
>> [ 151.853911] [<ffffffff811e7a36>] SyS_read+0x46/0xa0
>> [ 151.854872] [<ffffffff818bb1ee>] entry_SYSCALL_64_fastpath+0x12/0x71
>> [ 151.855935] ---[ end trace cce58b9a28c7a964 ]---
>> [ 151.855938] CPU: 0 PID: 8412 Comm: dd Not tainted 4.3.0-06686-g15c4f63 #1
>
> That's a known issue for that commit, it's fixed later in the
> series. Does it still trigger as-of commit c1c534609fe8?

Sorry for late. We have checked c1c534609fe8, there is no such WARNING
for that commit.

Best Regards,
Huang, Ying


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