Greetings,
Here is an NFS error triggered by this debug check.
git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git sched/wait
commit b87699e5fa31f451987a992b9cbda22d29ebcb46
Author: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
AuthorDate: Mon Aug 4 11:12:21 2014 +0200
Commit: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
CommitDate: Mon Aug 4 13:29:57 2014 +0200
wait: Add might_sleep()
Add more might_sleep() checks, suppose someone put a wait_event() like
thing in a wait loop..
Can't put might_sleep() in ___wait_event() because there's the locked
primitives which call ___wait_event() with locks held.
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-amr894sd1j012khd3fgyh9m8@xxxxxxxxxxxxxx
[ 13.363454] BUG: sleeping function called from invalid context at include/linux/wait.h:976
[ 13.365679] in_atomic(): 1, irqs_disabled(): 0, pid: 2715, name: dmesg
[ 13.367109] CPU: 1 PID: 2715 Comm: dmesg Not tainted 3.16.0-00048-gb87699e #1
[ 13.368385] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 13.369544] 0000000000000000 ffff88003e3efad0 ffffffff819c6bad ffff880035e9e480
[ 13.371838] ffff88003e3efae0 ffffffff81106e96 ffff88003e3efb00 ffffffff81306a2e
[ 13.373822] ffff880035e9e480 ffff88001b8a1a40 ffff88003e3efb48 ffffffff8130975a
[ 13.376165] Call Trace:
[ 13.376890] [<ffffffff819c6bad>] dump_stack+0x4d/0x66
[ 13.377903] [<ffffffff81106e96>] __might_sleep+0x10a/0x10c
[ 13.379247] [<ffffffff81306a2e>] nfs_page_group_lock+0x4e/0x7b
[ 13.380739] [<ffffffff8130975a>] nfs_lock_and_join_requests+0x83/0x334
[ 13.381884] [<ffffffff81309a9f>] nfs_do_writepage+0x94/0x191
[ 13.383078] [<ffffffff81309baf>] nfs_writepages_callback+0x13/0x25
[ 13.384592] [<ffffffff81309b9c>] ? nfs_do_writepage+0x191/0x191
[ 13.385745] [<ffffffff811963d0>] write_cache_pages+0x281/0x3a9
[ 13.386829] [<ffffffff81309b9c>] ? nfs_do_writepage+0x191/0x191
[ 13.388524] [<ffffffff8130a1fd>] nfs_writepages+0xa9/0x10f
[ 13.389903] [<ffffffff811994e1>] ? release_pages+0x1a2/0x20b
[ 13.391087] [<ffffffff81194835>] ? free_pcppages_bulk+0x298/0x33c
[ 13.392198] [<ffffffff81197c8b>] do_writepages+0x1e/0x2c
[ 13.393202] [<ffffffff8118e3f4>] __filemap_fdatawrite_range+0x55/0x57
[ 13.394313] [<ffffffff8118e4b4>] filemap_write_and_wait_range+0x2a/0x58
[ 13.395448] [<ffffffff812ff101>] nfs_file_fsync+0x4e/0x10c
[ 13.396546] [<ffffffff81211395>] vfs_fsync_range+0x1b/0x23
[ 13.397567] [<ffffffff812113b9>] vfs_fsync+0x1c/0x1e
[ 13.398517] [<ffffffff812ff679>] nfs_file_flush+0x6c/0x6f
[ 13.399513] [<ffffffff811e918b>] filp_close+0x3c/0x72
[ 13.400646] [<ffffffff8120295a>] put_files_struct+0x67/0xb3
[ 13.401759] [<ffffffff81202a43>] exit_files+0x4a/0x4f
[ 13.402756] [<ffffffff810e4073>] do_exit+0x3c9/0x985
[ 13.403740] [<ffffffff8106e605>] ? trace_do_page_fault+0x52/0xb7
[ 13.404875] [<ffffffff810e46a9>] do_group_exit+0x44/0xac
[ 13.405878] [<ffffffff810e4725>] SyS_exit_group+0x14/0x14
[ 13.406892] [<ffffffff819ce6a9>] system_call_fastpath+0x16/0x1b
[ 15.733276] BUG: sleeping function called from invalid context at include/linux/wait.h:976
[ 15.735154] in_atomic(): 1, irqs_disabled(): 0, pid: 2716, name: cat
[ 15.736263] CPU: 1 PID: 2716 Comm: cat Not tainted 3.16.0-00048-gb87699e #1
[ 15.737414] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 15.738754] 0000000000000000 ffff88000068b910 ffffffff819c6bad ffff880035e9e080
[ 15.746872] ffff88000068b920 ffffffff81106e96 ffff88000068b940 ffffffff81306a2e
[ 15.748694] ffff880035e9e080 ffff88001b8a1a40 ffff88000068b988 ffffffff8130975a
[ 15.750479] Call Trace:
[ 15.751164] [<ffffffff819c6bad>] dump_stack+0x4d/0x66
[ 15.752141] [<ffffffff81106e96>] __might_sleep+0x10a/0x10c
[ 15.753148] [<ffffffff81306a2e>] nfs_page_group_lock+0x4e/0x7b
[ 15.754183] [<ffffffff8130975a>] nfs_lock_and_join_requests+0x83/0x334
[ 15.755294] [<ffffffff81309a9f>] nfs_do_writepage+0x94/0x191
[ 15.756335] [<ffffffff81309baf>] nfs_writepages_callback+0x13/0x25
[ 15.757405] [<ffffffff81309b9c>] ? nfs_do_writepage+0x191/0x191
[ 15.758452] [<ffffffff811963d0>] write_cache_pages+0x281/0x3a9
[ 15.759483] [<ffffffff81309b9c>] ? nfs_do_writepage+0x191/0x191
[ 15.760547] [<ffffffff8130a1fd>] nfs_writepages+0xa9/0x10f
[ 15.761541] [<ffffffff81197c8b>] do_writepages+0x1e/0x2c
[ 15.762514] [<ffffffff8118e3f4>] __filemap_fdatawrite_range+0x55/0x57
[ 15.763612] [<ffffffff8118e4b4>] filemap_write_and_wait_range+0x2a/0x58
[ 15.764746] [<ffffffff812ff101>] nfs_file_fsync+0x4e/0x10c
[ 15.765748] [<ffffffff81211395>] vfs_fsync_range+0x1b/0x23
[ 15.766745] [<ffffffff812113b9>] vfs_fsync+0x1c/0x1e
[ 15.767681] [<ffffffff812ff679>] nfs_file_flush+0x6c/0x6f
[ 15.768690] [<ffffffff811e918b>] filp_close+0x3c/0x72
[ 15.769638] [<ffffffff8120295a>] put_files_struct+0x67/0xb3
[ 15.770635] [<ffffffff81202a43>] exit_files+0x4a/0x4f
[ 15.771581] [<ffffffff810e4073>] do_exit+0x3c9/0x985
[ 15.772537] [<ffffffff819caf04>] ? __schedule+0x4cb/0x734
[ 15.773522] [<ffffffff810e46a9>] do_group_exit+0x44/0xac
[ 15.774493] [<ffffffff810f0c03>] get_signal_to_deliver+0x53b/0x5cb
[ 15.775575] [<ffffffff810392b9>] do_signal+0x49/0x511
[ 15.776561] [<ffffffff81127334>] ? do_syslog+0x141/0x4a8
[ 15.777564] [<ffffffff8124915d>] ? kmsg_read+0x2d/0x54
[ 15.778513] [<ffffffff8123d924>] ? proc_reg_read+0x56/0x69
[ 15.779504] [<ffffffff810397b6>] do_notify_resume+0x35/0x72
[ 15.780521] [<ffffffff819ce908>] int_signal+0x12/0x17
This script may reproduce the error.
----------------------------------------------------------------------------
#!/bin/bash
kernel=$1
initrd=debian-x86_64.cgz
wget --no-clobber https://github.com/fengguang/reproduce-kernel-bug/raw/master/initrd/$initrd
kvm=(
qemu-system-x86_64
-enable-kvm
-cpu Nehalem
-kernel $kernel
-initrd $initrd
-m 1024
-smp 2
-net nic,vlan=1,model=e1000
-net user,vlan=1
-boot order=nc
-no-reboot
-watchdog i6300esb
-rtc base=localtime
-serial stdio
-display none
-monitor null
)
append=(
root=/dev/ram0
ip=::::vm-vp-1G-5::dhcp
oops=panic
earlyprintk=ttyS0,115200
debug
apic=debug
sysrq_always_enabled
rcupdate.rcu_cpu_stall_timeout=100
panic=10
softlockup_panic=1
nmi_watchdog=panic
load_ramdisk=2
prompt_ramdisk=0
console=ttyS0,115200
console=tty0
vga=normal
)
"${kvm[@]}" --append "${append[*]}"
----------------------------------------------------------------------------
Thanks,
Fengguang
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