> Curiously I do not see this when running the tests on my laptop And of course in the minute I write this it does happen again (I ran the test maybe 20 times today, and only just now it happened):
[11359.569157] INFO: task systemd-udevd:341 blocked for more than 120 seconds. [11359.569163] Not tainted 4.8.0-29-generic #31~lp1626436ProposedWithTwoPatches [11359.569165] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11359.569167] systemd-udevd D ffffa31788e77ba8 0 341 1 0x00000100 [11359.569173] ffffa31788e77ba8 00ffffff84c71a68 ffffa31499670000 ffffa31788e82ac0 [11359.569177] 0000000088e77db0 ffffa31788e78000 ffffa317893bc070 ffffa317893bc088 [11359.569179] ffffa31788e77be0 ffffa3149cf771c0 ffffa31788e77bc0 ffffffff85296905 [11359.569182] Call Trace: [11359.569190] [<ffffffff85296905>] schedule+0x35/0x80 [11359.569193] [<ffffffff85299543>] rwsem_down_read_failed+0x103/0x160 [11359.569197] [<ffffffff84e3eb98>] call_rwsem_down_read_failed+0x18/0x30 [11359.569200] [<ffffffff85298da0>] down_read+0x20/0x40 [11359.569202] [<ffffffff84c35e15>] get_super.part.7+0x95/0xd0 [11359.569204] [<ffffffff84c35e76>] get_super+0x26/0x30 [11359.569208] [<ffffffff84c70f98>] fsync_bdev+0x18/0x60 [11359.569211] [<ffffffff84e0f064>] invalidate_partition+0x24/0x50 [11359.569213] [<ffffffff84e12243>] rescan_partitions+0x53/0x2b0 [11359.569216] [<ffffffff84d728d8>] ? security_capable+0x48/0x60 [11359.569218] [<ffffffff84e0d0d5>] __blkdev_reread_part+0x65/0x70 [11359.569220] [<ffffffff84e0d103>] blkdev_reread_part+0x23/0x40 [11359.569222] [<ffffffff84e0db25>] blkdev_ioctl+0x425/0x910 [11359.569225] [<ffffffff84b43907>] ? __seccomp_filter+0x67/0x260 [11359.569228] [<ffffffff84c7090d>] block_ioctl+0x3d/0x50 [11359.569231] [<ffffffff84c47883>] do_vfs_ioctl+0xa3/0x610 [11359.569233] [<ffffffff84b441b3>] ? __secure_computing+0x43/0xe0 [11359.569236] [<ffffffff84a033ae>] ? syscall_trace_enter+0xce/0x2f0 [11359.569239] [<ffffffff84c47e69>] SyS_ioctl+0x79/0x90 [11359.569241] [<ffffffff84a03b9e>] do_syscall_64+0x5e/0xc0 [11359.569244] [<ffffffff8529b165>] entry_SYSCALL64_slow_path+0x25/0x25 [11359.569320] INFO: task mount.ntfs:15670 blocked for more than 120 seconds. [11359.569323] Not tainted 4.8.0-29-generic #31~lp1626436ProposedWithTwoPatches [11359.569324] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [11359.569325] mount.ntfs D ffffa314d0d1bd68 0 15670 5268 0x00000000 [11359.569329] ffffa314d0d1bd68 0000000100000003 ffffa3178bef9c80 ffffa31499670000 [11359.569332] 000000003d862ecf ffffa314d0d1c000 ffffa3149cf771dc ffffa31499670000 [11359.569334] 00000000ffffffff ffffa3149cf771e0 ffffa314d0d1bd80 ffffffff85296905 [11359.569337] Call Trace: [11359.569340] [<ffffffff85296905>] schedule+0x35/0x80 [11359.569342] [<ffffffff85296bae>] schedule_preempt_disabled+0xe/0x10 [11359.569344] [<ffffffff852987e9>] __mutex_lock_slowpath+0xb9/0x130 [11359.569347] [<ffffffff8529887f>] mutex_lock+0x1f/0x30 [11359.569350] [<ffffffff84c71440>] blkdev_put+0x20/0x110 [11359.569352] [<ffffffff84c71564>] blkdev_close+0x34/0x70 [11359.569354] [<ffffffff84c34f77>] __fput+0xe7/0x230 [11359.569356] [<ffffffff84c3512e>] ____fput+0xe/0x10 [11359.569358] [<ffffffff84aa2160>] task_work_run+0x80/0xa0 [11359.569361] [<ffffffff84a032d2>] exit_to_usermode_loop+0xc2/0xd0 [11359.569363] [<ffffffff84a03b2e>] syscall_return_slowpath+0x4e/0x60 [11359.569366] [<ffffffff8529b13e>] entry_SYSCALL_64_fastpath+0xa6/0xa8 root 15670 0.0 0.0 16040 460 ? Ds 10:41 0:00 /sbin/mount.ntfs /dev/sdb /run/media/root/553BDB6430706196 -o rw,nodev,nosuid,uid=0,gid=0,uhelper=udisks2 (uninterruptible kernel deep sleep, 'D' state). -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1398859 Title: unmounting NTFS causes mount.ntfs process to get stuck in eternal kernel deep sleep Status in linux package in Ubuntu: Confirmed Status in udisks2 package in Ubuntu: Fix Released Bug description: Since Mid-November the udisks2 test (https://jenkins.qa.ubuntu.com/job /vivid-adt-udisks2/? shows it happened between Nov 13 and 19) exhibits a regression with NTFS: Unmounting causes the ntfs-3g process to go into kernel deep sleep and umount hangs forever. This can be reproduced with sudo apt install ntfs-3g sudo modprobe scsi_debug # check dmesg which drive this created; e. g. /dev/sda sudo mkntfs -F /dev/sda sudo mount /dev/sda /mnt Now you have a process which is happy: root 12821 0.0 0.0 15272 1948 ? Ss 15:49 0:00 /sbin/mount.ntfs /dev/sda /mnt -o rw You can work with /mnt, edit files, etc. But now unmount: sudo umount /mnt This never returns, and the process goes into uninterruptible kernel sleep ("D"): root 12928 0.0 0.0 15272 1948 ? Ds 15:55 0:00 /sbin/mount.ntfs /dev/sda /mnt -o rw The strace for the umount until the hang is ubuntu@autopkgtest:~$ sudo strace -vvtts1024 -p 12928 Process 12928 attached 15:56:17.938299 read(4, "0\0\0\0\2\0\0\0\2\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0", 135168) = 48 15:56:22.338931 read(4, "(\0\0\0&\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 135168) = 40 15:56:22.339637 sendto(5, "<29>Dec 3 15:56:22 ntfs-3g[12928]: Unmounting /dev/sda ()\n", 59, MSG_NOSIGNAL, NULL, 0) = 59 15:56:22.340509 fsync(3) = 0 15:56:22.341188 fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0 15:56:22.341759 close(3 ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: ntfs-3g 1:2013.1.13AR.1-2ubuntu3 ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7 Uname: Linux 3.16.0-25-generic x86_64 ApportVersion: 2.15-0ubuntu1 Architecture: amd64 CurrentDesktop: Unity Date: Wed Dec 3 15:48:12 2014 EcryptfsInUse: Yes InstallationDate: Installed on 2014-11-20 (13 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141119) SourcePackage: ntfs-3g UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1398859/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
