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This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1465808
Title:
Hibernation fails due to a non-reachable cifs mount
Status in linux package in Ubuntu:
Incomplete
Bug description:
This happened twice during the last weeks with different kernel
versions on Kubuntu 15.04 (latest kernel images released). Steps
taken:
1) Mount cifs: sudo mount -t cifs -ouser=admin //x.y.z.a/video
/home/packi/video/
2) Watch movies (VLC startet using dolphin)
3) Hibernate
4) Wake-up at work (server no longer reachable)
5) Try to hibernate at work after 9 hours
Output of dmesg:
[224051.133206] PM: Syncing filesystems ... done.
[224051.174400] PM: Preparing system for freeze sleep
[224051.174567] Freezing user space processes ...
[224071.207476] Freezing of tasks failed after 20.008 seconds (1 tasks
refusing to freeze, wq_busy=0):
[224071.207529] dolphin D ffff880320a0b968 0 31153 1787
0x00000004
[224071.207532] ffff880320a0b968 ffff8802799a93a0 0000000000014200
ffff880320a0bfd8
[224071.207534] 0000000000014200 ffff88046c2d93a0 ffff8802799a93a0
0000000020a0b948
[224071.207536] ffff8800648c79b8 ffff8800648c79bc ffff8802799a93a0
00000000ffffffff
[224071.207538] Call Trace:
[224071.207545] [<ffffffff817c54e9>] schedule_preempt_disabled+0x29/0x70
[224071.207548] [<ffffffff817c73a5>] __mutex_lock_slowpath+0x95/0x100
[224071.207550] [<ffffffff817c7433>] mutex_lock+0x23/0x40
[224071.207566] [<ffffffffc0b89f90>] SendReceive+0x90/0x310 [cifs]
[224071.207570] [<ffffffffc0b637f5>] ? smb_init+0x45/0x60 [cifs]
[224071.207575] [<ffffffffc0b63a54>] CIFSSMBNegotiate+0x114/0x6c0 [cifs]
[224071.207583] [<ffffffffc0b92f33>] cifs_negotiate+0x43/0x60 [cifs]
[224071.207589] [<ffffffffc0b73e9f>] cifs_negotiate_protocol+0x7f/0xe0 [cifs]
[224071.207593] [<ffffffffc0b634c2>] cifs_reconnect_tcon+0xb2/0x320 [cifs]
[224071.207598] [<ffffffffc0b637de>] smb_init+0x2e/0x60 [cifs]
[224071.207603] [<ffffffffc0b6a51a>] CIFSSMBUnixQPathInfo+0x7a/0x300 [cifs]
[224071.207609] [<ffffffffc0b82446>] cifs_get_inode_info_unix+0x86/0x200
[cifs]
[224071.207614] [<ffffffff811fd8e1>] ? complete_walk+0x51/0x100
[224071.207616] [<ffffffff81203180>] ? path_lookupat+0x60/0xc90
[224071.207619] [<ffffffff811d68c9>] ? __kmalloc+0x1c9/0x280
[224071.207624] [<ffffffffc0b76156>] ? build_path_from_dentry+0xb6/0x2c0
[cifs]
[224071.207629] [<ffffffffc0b76156>] ? build_path_from_dentry+0xb6/0x2c0
[cifs]
[224071.207635] [<ffffffffc0b84abc>] cifs_revalidate_dentry_attr+0xbc/0x200
[cifs]
[224071.207641] [<ffffffffc0b84cb5>] cifs_getattr+0x55/0x130 [cifs]
[224071.207643] [<ffffffff811f85bc>] vfs_getattr_nosec+0x2c/0x40
[224071.207644] [<ffffffff811f867d>] vfs_getattr+0x2d/0x40
[224071.207646] [<ffffffff811f8754>] vfs_fstatat+0x64/0xa0
[224071.207647] [<ffffffff811f8c22>] SYSC_newlstat+0x22/0x40
[224071.207649] [<ffffffff811f8e6e>] SyS_newlstat+0xe/0x10
[224071.207652] [<ffffffff817c990d>] system_call_fastpath+0x16/0x1b
The task in question is hanging and can't be killed by -KILL or -TERM.
I also couldn't umount the mount using 'umount -f'.
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