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SubjectWARNING: at kernel/sched/core.c:7331 __might_sleep+0xa6/0xb0() during boot
Hello,
I'm getting these warnings once during boot since 3.19.0. The fs
is on lvm on md raid1.

[ 57.217167] ------------[ cut here ]------------
[ 57.221800] WARNING: CPU: 4 PID: 1071 at kernel/sched/core.c:7331 __might_sleep+0xa6/0xb0()
[ 57.230184] do not call blocking ops when !TASK_RUNNING; state=2 set at [<ffffffff81085d1b>] prepare_to_wait+0x2b/0xa0
[ 57.240886] Modules linked in: xt_multiport iptable_filter ip_tables x_tables cn dummy bridge stp llc xfs libcrc32c coretemp kvm_intel kvm iTCO_wdt microcode evdev iTCO_vendor_support psmouse serio_raw tpm_infineon tpm_tis tpm i7core_edac edac_core i2c_i801 button lpc_ich mfd_core i2c_core acpi_cpufreq processor thermal_sys hwmon_vid loop ipmi_watchdog ipmi_si ipmi_poweroff ipmi_devintf ipmi_msghandler fuse autofs4 btrfs xor raid6_pq dm_mod raid1 md_mod sg sd_mod hid_generic usbhid hid e1000e ptp crc32c_intel ahci libahci libata ehci_pci ehci_hcd scsi_mod pps_core usbcore usb_common
[ 57.274503] CPU: 4 PID: 1071 Comm: freshclam Not tainted 3.19.4 #72
[ 57.274503] Hardware name: Supermicro X8SIL/X8SIL, BIOS 1.1 05/27/2010
[ 57.274504] ffffffff8179723f ffff88022fedb2a8 ffffffff814f70f3 ffffffff81089bf9
[ 57.274507] ffff88022fedb2f8 ffff88022fedb2e8 ffffffff81049bc5 ffff88023466e540
[ 57.274509] ffffffff817af863 00000000000006f6 0000000000000000 ffff88023625d800
[ 57.274511] Call Trace:
[ 57.274512] [<ffffffff814f70f3>] dump_stack+0x4c/0x65
[ 57.274518] [<ffffffff81089bf9>] ? down_trylock+0x29/0x40
[ 57.274521] [<ffffffff81049bc5>] warn_slowpath_common+0x85/0xc0
[ 57.274524] [<ffffffff81049c41>] warn_slowpath_fmt+0x41/0x50
[ 57.274526] [<ffffffff81085d1b>] ? prepare_to_wait+0x2b/0xa0
[ 57.274527] [<ffffffff81085d1b>] ? prepare_to_wait+0x2b/0xa0
[ 57.274529] [<ffffffff8106df86>] __might_sleep+0xa6/0xb0
[ 57.274532] [<ffffffff81282beb>] generic_make_request_checks+0x2b/0x400
[ 57.274534] [<ffffffff8108eb6d>] ? trace_hardirqs_on_caller+0x15d/0x200
[ 57.274537] [<ffffffff8108ec1d>] ? trace_hardirqs_on+0xd/0x10
[ 57.274539] [<ffffffff81282fd3>] generic_make_request+0x13/0x120
[ 57.274541] [<ffffffffa02f95e8>] raid1_unplug+0x108/0x160 [raid1]
[ 57.274544] [<ffffffff812878d2>] blk_flush_plug_list+0xa2/0x240
[ 57.274546] [<ffffffff8108ec1d>] ? trace_hardirqs_on+0xd/0x10
[ 57.274548] [<ffffffff814f9510>] ? bit_wait_timeout+0x80/0x80
[ 57.274550] [<ffffffff814f8cad>] io_schedule+0x7d/0x150
[ 57.274552] [<ffffffff814f953f>] bit_wait_io+0x2f/0x50
[ 57.274553] [<ffffffff814f90cf>] __wait_on_bit+0x5f/0x90
[ 57.274555] [<ffffffff814f9510>] ? bit_wait_timeout+0x80/0x80
[ 57.274556] [<ffffffff814f916d>] out_of_line_wait_on_bit+0x6d/0x80
[ 57.274558] [<ffffffff810860e0>] ? autoremove_wake_function+0x40/0x40
[ 57.274559] [<ffffffff811b0b2f>] __wait_on_buffer+0x3f/0x50
[ 57.274562] [<ffffffff811f64e0>] ext4_wait_block_bitmap.part.10+0xc0/0xd0
[ 57.274566] [<ffffffff811f6509>] ext4_wait_block_bitmap+0x19/0x20
[ 57.274567] [<ffffffff81230ef3>] ext4_mb_init_cache+0x203/0x780
[ 57.274570] [<ffffffff811207e9>] ? lru_cache_add+0x9/0x10
[ 57.274574] [<ffffffff8123158e>] ext4_mb_init_group+0x11e/0x210
[ 57.274575] [<ffffffff812317ab>] ext4_mb_good_group+0x12b/0x1a0
[ 57.274577] [<ffffffff81234b38>] ext4_mb_regular_allocator+0x1b8/0x460
[ 57.274579] [<ffffffff8122ffe0>] ? ext4_mb_use_preallocated.constprop.27+0x40/0x350
[ 57.274580] [<ffffffff8122f6fd>] ? ext4_mb_initialize_context+0x6d/0x1b0
[ 57.274582] [<ffffffff81236830>] ext4_mb_new_blocks+0x480/0x600
[ 57.274584] [<ffffffff8122b27d>] ext4_ext_map_blocks+0x62d/0xeb0
[ 57.274586] [<ffffffff811feb53>] ext4_map_blocks+0x133/0x560
[ 57.274588] [<ffffffff81201ed0>] ext4_writepages+0x560/0xdb0
[ 57.274590] [<ffffffff8111e3ac>] do_writepages+0x1c/0x30
[ 57.274592] [<ffffffff811128d1>] __filemap_fdatawrite_range+0x51/0x60
[ 57.274595] [<ffffffff81112977>] filemap_flush+0x17/0x20
[ 57.274597] [<ffffffff811ff851>] ext4_alloc_da_blocks+0x41/0x90
[ 57.274598] [<ffffffff8120ce0c>] ext4_rename+0x62c/0x880
[ 57.274601] [<ffffffff8108e9e1>] ? mark_held_locks+0x71/0xa0
[ 57.274603] [<ffffffff814faa3e>] ? mutex_lock_nested+0x22e/0x3b0
[ 57.274605] [<ffffffff8120d078>] ext4_rename2+0x18/0x40
[ 57.274606] [<ffffffff811897c2>] vfs_rename+0x3a2/0x7e0
[ 57.274609] [<ffffffff8118c8b0>] SYSC_renameat2+0x5b0/0x620
[ 57.274610] [<ffffffff814fe3e1>] ? _raw_spin_unlock_irqrestore+0x31/0x50
[ 57.274613] [<ffffffff81085bd8>] ? remove_wait_queue+0x48/0x50
[ 57.274615] [<ffffffff8104cb98>] ? do_wait+0x198/0x2c0
[ 57.274617] [<ffffffff8108eb6d>] ? trace_hardirqs_on_caller+0x15d/0x200
[ 57.274618] [<ffffffff812b7b1b>] ? trace_hardirqs_on_thunk+0x3a/0x3f
[ 57.274621] [<ffffffff8118dba9>] SyS_rename+0x19/0x20
[ 57.274623] [<ffffffff814fecb2>] system_call_fastpath+0x12/0x17
[ 57.274626] ---[ end trace b4ab91b16fa597a6 ]---


Thanks,

Petr Janecek


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