Thanks, I’ll investigate. -dros On Aug 5, 2014, at 10:03 AM, Fengguang Wu <fengguang.wu@xxxxxxxxx> wrote: > 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 > _______________________________________________ > LKP mailing list > LKP@xxxxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
