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[Bug 1814231] [NEW] linux 4.4.0-142.168 ADT test failure (ubuntu_vfat_stress): hung task on i386

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Public bug reported:

Testing failed on:
    i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20190201_082722_4cb3e@/log.gz

ubuntu_vfat_stress is causing a kernel hung task on xenial/linux i386:

Started, PID 23212
  Timed out waiting for stress-ng to finish
  Forcefully killing, PID 23212 (after 121 seconds)
  Found kernel warning and/or call trace:
   
  [ 3998.807995] Testing: --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
  [ 3998.832802] Created loop image vfat-test-23176/vfat-image-23176.img on /dev/loop0
  [ 3999.936713] ubuntu_vfat_str (23176): drop_caches: 1
  [ 3999.944908] ubuntu_vfat_str (23176): drop_caches: 2
  [ 3999.949450] ubuntu_vfat_str (23176): drop_caches: 3
  [ 3999.967248] VFAT options:  allow_utime=20
  [ 3999.967299] Stress test:   /tmp/autopkgtest.ytglRN/build.6Ql/src/autotest/client/tmp/ubuntu_vfat_stress/src/stress-ng/stress-ng --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
  [ 3999.967318] Mount point:   /mnt/vfat-test-23176
  [ 3999.967994] Started, PID 23212
  [ 4121.902337] Timed out waiting for stress-ng to finish
  [ 4121.902488] Forcefully killing, PID 23212 (after 121 seconds)
  [ 4200.180102] INFO: task stress-ng:23229 blocked for more than 120 seconds.
  [ 4200.184444]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
  [ 4200.185438] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 4200.186581] stress-ng       D c1214654     0 23229      1 0x00000004
  [ 4200.186587]  c5bc9ebc 00000086 c5bc9ea4 c1214654 00000000 ce0a5b00 64d56897 000003a3
  [ 4200.186591]  6497d7cf 000003a3 d8185dc0 d239a800 c5bca000 d00ce5e0 c5bc9f08 c5bc9ec8
  [ 4200.186595]  c17e194d c5bc9f08 c5bc9ef0 c12146ad 00000000 d239a800 c10b5340 d00ce5e4
  [ 4200.186598] Call Trace:
  [ 4200.186608]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
  [ 4200.186613]  [<c17e194d>] schedule+0x2d/0x80
  [ 4200.186616]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
  [ 4200.186620]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
  [ 4200.186622]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
  [ 4200.186624]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
  [ 4200.186628]  [<c11ef26d>] iterate_supers+0xcd/0xd0
  [ 4200.186630]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
  [ 4200.186632]  [<c121d95a>] sys_sync+0x3a/0xa0
  [ 4200.186636]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
  [ 4200.186639]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61
  [ 4200.186641] INFO: task stress-ng:23242 blocked for more than 120 seconds.
  [ 4200.187628]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
  [ 4200.188667] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
  [ 4200.189947] stress-ng       D c1214654     0 23242      1 0x00000004
  [ 4200.189952]  c011bebc 00000086 c011bea4 c1214654 00000000 dd922680 65d2d986 000003a3
  [ 4200.189955]  65bb3d70 000003a3 d8185dc0 cef0b200 c011c000 d00ce5e0 c011bf08 c011bec8
  [ 4200.189958]  c17e194d c011bf08 c011bef0 c12146ad 00000000 cef0b200 c10b5340 c5bc9edc
  [ 4200.189962] Call Trace:
  [ 4200.189965]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
  [ 4200.189968]  [<c17e194d>] schedule+0x2d/0x80
  [ 4200.189971]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
  [ 4200.189973]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
  [ 4200.189975]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
  [ 4200.189978]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
  [ 4200.189980]  [<c11ef26d>] iterate_supers+0xcd/0xd0
  [ 4200.189983]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
  [ 4200.189985]  [<c121d95a>] sys_sync+0x3a/0xa0
  [ 4200.189987]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
  [ 4200.189989]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61

This is not a regression, different call traces or errors have been
reported by older versions.

** Affects: ubuntu-kernel-tests
     Importance: Undecided
         Status: New

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Invalid

** Affects: linux (Ubuntu Xenial)
     Importance: Undecided
         Status: Confirmed


** Tags: kernel-adt-failure

** Tags added: kernel-adt-failure

** Summary changed:

- linux 4.4.0-142.168 ADT test failure with linux 4.4.0-142.168
+ linux 4.4.0-142.168 ADT test failure (ubuntu_vfat_stress): hung task on i386

** Description changed:

  Testing failed on:
-     i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20190201_082722_4cb3e@/log.gz
+     i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20190201_082722_4cb3e@/log.gz
+ 
+ ubuntu_vfat_stress is causing a kernel hung task on xenial/linux i386:
+ 
+ Started, PID 23212
+   Timed out waiting for stress-ng to finish
+   Forcefully killing, PID 23212 (after 121 seconds)
+   Found kernel warning and/or call trace:
+    
+   [ 3998.807995] Testing: --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
+   [ 3998.832802] Created loop image vfat-test-23176/vfat-image-23176.img on /dev/loop0
+   [ 3999.936713] ubuntu_vfat_str (23176): drop_caches: 1
+   [ 3999.944908] ubuntu_vfat_str (23176): drop_caches: 2
+   [ 3999.949450] ubuntu_vfat_str (23176): drop_caches: 3
+   [ 3999.967248] VFAT options:  allow_utime=20
+   [ 3999.967299] Stress test:   /tmp/autopkgtest.ytglRN/build.6Ql/src/autotest/client/tmp/ubuntu_vfat_stress/src/stress-ng/stress-ng --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
+   [ 3999.967318] Mount point:   /mnt/vfat-test-23176
+   [ 3999.967994] Started, PID 23212
+   [ 4121.902337] Timed out waiting for stress-ng to finish
+   [ 4121.902488] Forcefully killing, PID 23212 (after 121 seconds)
+   [ 4200.180102] INFO: task stress-ng:23229 blocked for more than 120 seconds.
+   [ 4200.184444]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
+   [ 4200.185438] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
+   [ 4200.186581] stress-ng       D c1214654     0 23229      1 0x00000004
+   [ 4200.186587]  c5bc9ebc 00000086 c5bc9ea4 c1214654 00000000 ce0a5b00 64d56897 000003a3
+   [ 4200.186591]  6497d7cf 000003a3 d8185dc0 d239a800 c5bca000 d00ce5e0 c5bc9f08 c5bc9ec8
+   [ 4200.186595]  c17e194d c5bc9f08 c5bc9ef0 c12146ad 00000000 d239a800 c10b5340 d00ce5e4
+   [ 4200.186598] Call Trace:
+   [ 4200.186608]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
+   [ 4200.186613]  [<c17e194d>] schedule+0x2d/0x80
+   [ 4200.186616]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
+   [ 4200.186620]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
+   [ 4200.186622]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
+   [ 4200.186624]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
+   [ 4200.186628]  [<c11ef26d>] iterate_supers+0xcd/0xd0
+   [ 4200.186630]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
+   [ 4200.186632]  [<c121d95a>] sys_sync+0x3a/0xa0
+   [ 4200.186636]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
+   [ 4200.186639]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61
+   [ 4200.186641] INFO: task stress-ng:23242 blocked for more than 120 seconds.
+   [ 4200.187628]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
+   [ 4200.188667] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
+   [ 4200.189947] stress-ng       D c1214654     0 23242      1 0x00000004
+   [ 4200.189952]  c011bebc 00000086 c011bea4 c1214654 00000000 dd922680 65d2d986 000003a3
+   [ 4200.189955]  65bb3d70 000003a3 d8185dc0 cef0b200 c011c000 d00ce5e0 c011bf08 c011bec8
+   [ 4200.189958]  c17e194d c011bf08 c011bef0 c12146ad 00000000 cef0b200 c10b5340 c5bc9edc
+   [ 4200.189962] Call Trace:
+   [ 4200.189965]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
+   [ 4200.189968]  [<c17e194d>] schedule+0x2d/0x80
+   [ 4200.189971]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
+   [ 4200.189973]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
+   [ 4200.189975]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
+   [ 4200.189978]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
+   [ 4200.189980]  [<c11ef26d>] iterate_supers+0xcd/0xd0
+   [ 4200.189983]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
+   [ 4200.189985]  [<c121d95a>] sys_sync+0x3a/0xa0
+   [ 4200.189987]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
+   [ 4200.189989]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61
+ 
+ This is not a regression, different call traces or errors have been
+ reported by older versions.

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Invalid

** Changed in: linux (Ubuntu Xenial)
       Status: New => Confirmed

** Also affects: ubuntu-kernel-tests
   Importance: Undecided
       Status: New

-- 
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भाषा समायोजकहरुको समूह, which is subscribed to Xenial.
Matching subscriptions: Ubuntu 16.04 Bugs
https://bugs.launchpad.net/bugs/1814231

Title:
  linux 4.4.0-142.168 ADT test failure (ubuntu_vfat_stress): hung task
  on i386

Status in ubuntu-kernel-tests:
  New
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Xenial:
  Confirmed

Bug description:
  Testing failed on:
      i386: https://objectstorage.prodstack4-5.canonical.com/v1/AUTH_77e2ada1e7a84929a74ba3b87153c0ac/autopkgtest-xenial/xenial/i386/l/linux/20190201_082722_4cb3e@/log.gz

  ubuntu_vfat_stress is causing a kernel hung task on xenial/linux i386:

  Started, PID 23212
    Timed out waiting for stress-ng to finish
    Forcefully killing, PID 23212 (after 121 seconds)
    Found kernel warning and/or call trace:
     
    [ 3998.807995] Testing: --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
    [ 3998.832802] Created loop image vfat-test-23176/vfat-image-23176.img on /dev/loop0
    [ 3999.936713] ubuntu_vfat_str (23176): drop_caches: 1
    [ 3999.944908] ubuntu_vfat_str (23176): drop_caches: 2
    [ 3999.949450] ubuntu_vfat_str (23176): drop_caches: 3
    [ 3999.967248] VFAT options:  allow_utime=20
    [ 3999.967299] Stress test:   /tmp/autopkgtest.ytglRN/build.6Ql/src/autotest/client/tmp/ubuntu_vfat_stress/src/stress-ng/stress-ng --verify --times --metrics-brief --syslog --keep-name -t 10s --hdd 2 --hdd-opts sync,wr-rnd,rd-rnd,fadv-willneed,fadv-rnd --lockf 2 --seek 2 --aio 2 --aio-requests 32 --dentry 2 --dir 2 --dentry-order stride --fallocate 2 --fstat 2 --dentries 100 --lease 2 --open 2 --rename 2 --hdd-bytes 4M --fallocate-bytes 2M --chdir 2 --rename 2 --hdd-write-size 512
    [ 3999.967318] Mount point:   /mnt/vfat-test-23176
    [ 3999.967994] Started, PID 23212
    [ 4121.902337] Timed out waiting for stress-ng to finish
    [ 4121.902488] Forcefully killing, PID 23212 (after 121 seconds)
    [ 4200.180102] INFO: task stress-ng:23229 blocked for more than 120 seconds.
    [ 4200.184444]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
    [ 4200.185438] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [ 4200.186581] stress-ng       D c1214654     0 23229      1 0x00000004
    [ 4200.186587]  c5bc9ebc 00000086 c5bc9ea4 c1214654 00000000 ce0a5b00 64d56897 000003a3
    [ 4200.186591]  6497d7cf 000003a3 d8185dc0 d239a800 c5bca000 d00ce5e0 c5bc9f08 c5bc9ec8
    [ 4200.186595]  c17e194d c5bc9f08 c5bc9ef0 c12146ad 00000000 d239a800 c10b5340 d00ce5e4
    [ 4200.186598] Call Trace:
    [ 4200.186608]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
    [ 4200.186613]  [<c17e194d>] schedule+0x2d/0x80
    [ 4200.186616]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
    [ 4200.186620]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
    [ 4200.186622]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
    [ 4200.186624]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
    [ 4200.186628]  [<c11ef26d>] iterate_supers+0xcd/0xd0
    [ 4200.186630]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
    [ 4200.186632]  [<c121d95a>] sys_sync+0x3a/0xa0
    [ 4200.186636]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
    [ 4200.186639]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61
    [ 4200.186641] INFO: task stress-ng:23242 blocked for more than 120 seconds.
    [ 4200.187628]       Tainted: G           OE   4.4.0-142-generic #168-Ubuntu
    [ 4200.188667] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
    [ 4200.189947] stress-ng       D c1214654     0 23242      1 0x00000004
    [ 4200.189952]  c011bebc 00000086 c011bea4 c1214654 00000000 dd922680 65d2d986 000003a3
    [ 4200.189955]  65bb3d70 000003a3 d8185dc0 cef0b200 c011c000 d00ce5e0 c011bf08 c011bec8
    [ 4200.189958]  c17e194d c011bf08 c011bef0 c12146ad 00000000 cef0b200 c10b5340 c5bc9edc
    [ 4200.189962] Call Trace:
    [ 4200.189965]  [<c1214654>] ? wb_queue_work+0xe4/0xf0
    [ 4200.189968]  [<c17e194d>] schedule+0x2d/0x80
    [ 4200.189971]  [<c12146ad>] wb_wait_for_completion+0x4d/0x90
    [ 4200.189973]  [<c10b5340>] ? wake_atomic_t_function+0x70/0x70
    [ 4200.189975]  [<c1217bdd>] sync_inodes_sb+0x7d/0x1a0
    [ 4200.189978]  [<c121d625>] sync_inodes_one_sb+0x15/0x20
    [ 4200.189980]  [<c11ef26d>] iterate_supers+0xcd/0xd0
    [ 4200.189983]  [<c121d610>] ? SyS_tee+0x2a0/0x2a0
    [ 4200.189985]  [<c121d95a>] sys_sync+0x3a/0xa0
    [ 4200.189987]  [<c10038af>] do_fast_syscall_32+0x9f/0x160
    [ 4200.189989]  [<c17e5bf0>] sysenter_past_esp+0x3d/0x61

  This is not a regression, different call traces or errors have been
  reported by older versions.

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