| 2018-06-05 11:34:40 |
Po-Hsu Lin |
bug |
|
|
added bug |
| 2018-06-05 11:36:10 |
Po-Hsu Lin |
summary |
fanotify07 in LTP syscall test cause kernel oops with T kernel |
fanotify07 in LTP syscall test generates kernel trace with T kernel |
|
| 2018-06-05 11:41:55 |
Po-Hsu Lin |
bug task added |
|
ubuntu-kernel-tests |
|
| 2018-06-05 12:00:08 |
Ubuntu Kernel Bot |
linux (Ubuntu): status |
New |
Confirmed |
|
| 2018-06-05 16:32:11 |
Joseph Salisbury |
linux (Ubuntu): importance |
Undecided |
Medium |
|
| 2018-06-05 16:32:18 |
Joseph Salisbury |
nominated for series |
|
Ubuntu Trusty |
|
| 2018-06-05 16:32:18 |
Joseph Salisbury |
bug task added |
|
linux (Ubuntu Trusty) |
|
| 2018-06-05 16:32:25 |
Joseph Salisbury |
linux (Ubuntu Trusty): status |
New |
Triaged |
|
| 2018-06-05 16:32:28 |
Joseph Salisbury |
linux (Ubuntu): status |
Confirmed |
Triaged |
|
| 2018-06-05 16:32:31 |
Joseph Salisbury |
linux (Ubuntu Trusty): importance |
Undecided |
Medium |
|
| 2018-06-06 10:43:46 |
Po-Hsu Lin |
summary |
fanotify07 in LTP syscall test generates kernel trace with T kernel |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T kernel |
|
| 2018-06-06 10:44:47 |
Po-Hsu Lin |
description |
The "fanotify07" from the LTP syscall tests has failed on a testing node with Trusty kernel installed.
Steps (with root):
1. sudo apt-get install git xfsprogs -y
2. git clone --depth=1 https://github.com/linux-test-project/ltp.git
3. cd ltp
4. make autotools
5. ./configure
6. make; make install
7. cd /opt/ltp
8. echo "fanotify07 fanotify07" > /tmp/jobs
9. ./runltp -f /tmp/jobs
<<<test_start>>>
tag=fanotify07 stime=1528197132
cmdline="fanotify07"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Cannot kill test processes!
Congratulation, likely test hit a kernel bug.
Exitting uncleanly...
<<<execution_status>>>
initiation_status="ok"
duration=350 termination_type=exited termination_id=1 corefile=no
cutime=0 cstime=0
<<<test_end>>>
INFO: ltp-pan reported some tests FAIL
LTP Version: 20180515
[ 841.063676] INFO: task fanotify07:3660 blocked for more than 120 seconds.
[ 841.063692] Not tainted 3.13.0-149-generic #199-Ubuntu
[ 841.063705] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 841.063723] fanotify07 D ffff8804584742f0 0 3660 3652 0x00000000
[ 841.063724] ffff880459e9bd00 0000000000000086 ffff88045556b000 0000000000013b00
[ 841.063726] ffff880459e9bfd8 0000000000013b00 ffff88045556b000 ffff880459b4e690
[ 841.063728] 0000000000000000 ffff880458474200 ffff8804584742f0 0000000000020000
[ 841.063730] Call Trace:
[ 841.063731] [<ffffffff8173bae9>] schedule+0x29/0x70
[ 841.063733] [<ffffffff8120bfb0>] fanotify_handle_event+0x110/0x1d0
[ 841.063735] [<ffffffff810b0c30>] ? prepare_to_wait_event+0x100/0x100
[ 841.063737] [<ffffffff81207c36>] send_to_group+0x166/0x240
[ 841.063738] [<ffffffff811e0731>] ? touch_atime+0x71/0x140
[ 841.063740] [<ffffffff81207ff5>] fsnotify+0x2e5/0x320
[ 841.063742] [<ffffffff812e1d84>] security_file_permission+0x94/0xb0
[ 841.063743] [<ffffffff811c5192>] rw_verify_area+0x52/0xd0
[ 841.063745] [<ffffffff811c527a>] vfs_read+0x6a/0x160
[ 841.063746] [<ffffffff811c5db9>] SyS_read+0x49/0xa0
[ 841.063748] [<ffffffff81748830>] system_call_fastpath+0x1a/0x1f
[ 1304.848642] ltp-pan[3809]: segfault at 0 ip 00007f07c8aafdfa sp 00007ffc1da92078 error 4 in libc-2.19.so[7f07c8a27000+1be000]
dmesg: http://paste.ubuntu.com/p/FRZnV5smGh/
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-149-generic 3.13.0-149.199
ProcVersionSignature: User Name 3.13.0-149.199-generic 3.13.11-ckt39
Uname: Linux 3.13.0-149-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jun 5 11:01 seq
crw-rw---- 1 root audio 116, 33 Jun 5 11:01 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg: [ 3.553366] init: plymouth-upstart-bridge main process ended, respawning
Date: Tue Jun 5 11:06:45 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Intel Corporation S1200RP
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-149-generic root=UUID=b0d2ae4e-12dd-423e-acea-272ee8b2a893 ro
RelatedPackageVersions:
linux-restricted-modules-3.13.0-149-generic N/A
linux-backports-modules-3.13.0-149-generic N/A
linux-firmware 1.127.24
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/01/2015
dmi.bios.vendor: Intel Corp.
dmi.bios.version: S1200RP.86B.03.02.0003.070120151022
dmi.board.asset.tag: ....................
dmi.board.name: S1200RP
dmi.board.vendor: Intel Corporation
dmi.board.version: G62254-407
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 17
dmi.chassis.vendor: ..............................
dmi.chassis.version: ..................
dmi.modalias: dmi:bvnIntelCorp.:bvrS1200RP.86B.03.02.0003.070120151022:bd07/01/2015:svnIntelCorporation:pnS1200RP:pvr....................:rvnIntelCorporation:rnS1200RP:rvrG62254-407:cvn..............................:ct17:cvr..................:
dmi.product.name: S1200RP
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation |
The "fanotify07" and "fanotify08" from the LTP syscall tests has failed on a testing node with Trusty kernel installed.
Steps (with root):
1. sudo apt-get install git xfsprogs -y
2. git clone --depth=1 https://github.com/linux-test-project/ltp.git
3. cd ltp
4. make autotools
5. ./configure
6. make; make install
7. cd /opt/ltp
8. echo -e "fanotify07 fanotify07 \nfanotify08 fanotify08" > /tmp/jobs
9. ./runltp -f /tmp/jobs
<<<test_start>>>
tag=fanotify07 stime=1528197132
cmdline="fanotify07"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Cannot kill test processes!
Congratulation, likely test hit a kernel bug.
Exitting uncleanly...
<<<execution_status>>>
initiation_status="ok"
duration=350 termination_type=exited termination_id=1 corefile=no
cutime=0 cstime=0
<<<test_end>>>
INFO: ltp-pan reported some tests FAIL
LTP Version: 20180515
[ 841.063676] INFO: task fanotify07:3660 blocked for more than 120 seconds.
[ 841.063692] Not tainted 3.13.0-149-generic #199-Ubuntu
[ 841.063705] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 841.063723] fanotify07 D ffff8804584742f0 0 3660 3652 0x00000000
[ 841.063724] ffff880459e9bd00 0000000000000086 ffff88045556b000 0000000000013b00
[ 841.063726] ffff880459e9bfd8 0000000000013b00 ffff88045556b000 ffff880459b4e690
[ 841.063728] 0000000000000000 ffff880458474200 ffff8804584742f0 0000000000020000
[ 841.063730] Call Trace:
[ 841.063731] [<ffffffff8173bae9>] schedule+0x29/0x70
[ 841.063733] [<ffffffff8120bfb0>] fanotify_handle_event+0x110/0x1d0
[ 841.063735] [<ffffffff810b0c30>] ? prepare_to_wait_event+0x100/0x100
[ 841.063737] [<ffffffff81207c36>] send_to_group+0x166/0x240
[ 841.063738] [<ffffffff811e0731>] ? touch_atime+0x71/0x140
[ 841.063740] [<ffffffff81207ff5>] fsnotify+0x2e5/0x320
[ 841.063742] [<ffffffff812e1d84>] security_file_permission+0x94/0xb0
[ 841.063743] [<ffffffff811c5192>] rw_verify_area+0x52/0xd0
[ 841.063745] [<ffffffff811c527a>] vfs_read+0x6a/0x160
[ 841.063746] [<ffffffff811c5db9>] SyS_read+0x49/0xa0
[ 841.063748] [<ffffffff81748830>] system_call_fastpath+0x1a/0x1f
[ 1304.848642] ltp-pan[3809]: segfault at 0 ip 00007f07c8aafdfa sp 00007ffc1da92078 error 4 in libc-2.19.so[7f07c8a27000+1be000]
dmesg: http://paste.ubuntu.com/p/FRZnV5smGh/
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-149-generic 3.13.0-149.199
ProcVersionSignature: User Name 3.13.0-149.199-generic 3.13.11-ckt39
Uname: Linux 3.13.0-149-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jun 5 11:01 seq
crw-rw---- 1 root audio 116, 33 Jun 5 11:01 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg: [ 3.553366] init: plymouth-upstart-bridge main process ended, respawning
Date: Tue Jun 5 11:06:45 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Intel Corporation S1200RP
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-149-generic root=UUID=b0d2ae4e-12dd-423e-acea-272ee8b2a893 ro
RelatedPackageVersions:
linux-restricted-modules-3.13.0-149-generic N/A
linux-backports-modules-3.13.0-149-generic N/A
linux-firmware 1.127.24
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/01/2015
dmi.bios.vendor: Intel Corp.
dmi.bios.version: S1200RP.86B.03.02.0003.070120151022
dmi.board.asset.tag: ....................
dmi.board.name: S1200RP
dmi.board.vendor: Intel Corporation
dmi.board.version: G62254-407
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 17
dmi.chassis.vendor: ..............................
dmi.chassis.version: ..................
dmi.modalias: dmi:bvnIntelCorp.:bvrS1200RP.86B.03.02.0003.070120151022:bd07/01/2015:svnIntelCorporation:pnS1200RP:pvr....................:rvnIntelCorporation:rnS1200RP:rvrG62254-407:cvn..............................:ct17:cvr..................:
dmi.product.name: S1200RP
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation |
|
| 2018-06-06 10:47:53 |
Po-Hsu Lin |
tags |
amd64 apport-bug trusty uec-images |
amd64 apport-bug ppc64le trusty uec-images |
|
| 2018-06-22 07:20:13 |
Po-Hsu Lin |
summary |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T kernel |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T/X/X-AWs kernel |
|
| 2018-06-22 07:20:18 |
Po-Hsu Lin |
summary |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T/X/X-AWs kernel |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T/X/X-AWS kernel |
|
| 2019-04-10 03:26:24 |
Matthew Ruffell |
nominated for series |
|
Ubuntu Xenial |
|
| 2019-04-10 03:26:24 |
Matthew Ruffell |
bug task added |
|
linux (Ubuntu Xenial) |
|
| 2019-04-10 03:26:38 |
Matthew Ruffell |
linux (Ubuntu Xenial): importance |
Undecided |
Medium |
|
| 2019-04-10 03:27:09 |
Matthew Ruffell |
linux (Ubuntu Xenial): status |
New |
In Progress |
|
| 2019-04-10 03:27:14 |
Matthew Ruffell |
linux (Ubuntu Xenial): assignee |
|
Matthew Ruffell (mruffell) |
|
| 2019-04-10 03:29:06 |
Matthew Ruffell |
tags |
amd64 apport-bug ppc64le trusty uec-images |
amd64 apport-bug ppc64le sts trusty uec-images |
|
| 2019-04-10 03:30:33 |
Matthew Ruffell |
description |
The "fanotify07" and "fanotify08" from the LTP syscall tests has failed on a testing node with Trusty kernel installed.
Steps (with root):
1. sudo apt-get install git xfsprogs -y
2. git clone --depth=1 https://github.com/linux-test-project/ltp.git
3. cd ltp
4. make autotools
5. ./configure
6. make; make install
7. cd /opt/ltp
8. echo -e "fanotify07 fanotify07 \nfanotify08 fanotify08" > /tmp/jobs
9. ./runltp -f /tmp/jobs
<<<test_start>>>
tag=fanotify07 stime=1528197132
cmdline="fanotify07"
contacts=""
analysis=exit
<<<test_output>>>
incrementing stop
tst_test.c:1015: INFO: Timeout per run is 0h 05m 00s
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Cannot kill test processes!
Congratulation, likely test hit a kernel bug.
Exitting uncleanly...
<<<execution_status>>>
initiation_status="ok"
duration=350 termination_type=exited termination_id=1 corefile=no
cutime=0 cstime=0
<<<test_end>>>
INFO: ltp-pan reported some tests FAIL
LTP Version: 20180515
[ 841.063676] INFO: task fanotify07:3660 blocked for more than 120 seconds.
[ 841.063692] Not tainted 3.13.0-149-generic #199-Ubuntu
[ 841.063705] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 841.063723] fanotify07 D ffff8804584742f0 0 3660 3652 0x00000000
[ 841.063724] ffff880459e9bd00 0000000000000086 ffff88045556b000 0000000000013b00
[ 841.063726] ffff880459e9bfd8 0000000000013b00 ffff88045556b000 ffff880459b4e690
[ 841.063728] 0000000000000000 ffff880458474200 ffff8804584742f0 0000000000020000
[ 841.063730] Call Trace:
[ 841.063731] [<ffffffff8173bae9>] schedule+0x29/0x70
[ 841.063733] [<ffffffff8120bfb0>] fanotify_handle_event+0x110/0x1d0
[ 841.063735] [<ffffffff810b0c30>] ? prepare_to_wait_event+0x100/0x100
[ 841.063737] [<ffffffff81207c36>] send_to_group+0x166/0x240
[ 841.063738] [<ffffffff811e0731>] ? touch_atime+0x71/0x140
[ 841.063740] [<ffffffff81207ff5>] fsnotify+0x2e5/0x320
[ 841.063742] [<ffffffff812e1d84>] security_file_permission+0x94/0xb0
[ 841.063743] [<ffffffff811c5192>] rw_verify_area+0x52/0xd0
[ 841.063745] [<ffffffff811c527a>] vfs_read+0x6a/0x160
[ 841.063746] [<ffffffff811c5db9>] SyS_read+0x49/0xa0
[ 841.063748] [<ffffffff81748830>] system_call_fastpath+0x1a/0x1f
[ 1304.848642] ltp-pan[3809]: segfault at 0 ip 00007f07c8aafdfa sp 00007ffc1da92078 error 4 in libc-2.19.so[7f07c8a27000+1be000]
dmesg: http://paste.ubuntu.com/p/FRZnV5smGh/
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: linux-image-3.13.0-149-generic 3.13.0-149.199
ProcVersionSignature: User Name 3.13.0-149.199-generic 3.13.11-ckt39
Uname: Linux 3.13.0-149-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Jun 5 11:01 seq
crw-rw---- 1 root audio 116, 33 Jun 5 11:01 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
ApportVersion: 2.14.1-0ubuntu3.27
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDmesg: [ 3.553366] init: plymouth-upstart-bridge main process ended, respawning
Date: Tue Jun 5 11:06:45 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
MachineType: Intel Corporation S1200RP
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-149-generic root=UUID=b0d2ae4e-12dd-423e-acea-272ee8b2a893 ro
RelatedPackageVersions:
linux-restricted-modules-3.13.0-149-generic N/A
linux-backports-modules-3.13.0-149-generic N/A
linux-firmware 1.127.24
RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/01/2015
dmi.bios.vendor: Intel Corp.
dmi.bios.version: S1200RP.86B.03.02.0003.070120151022
dmi.board.asset.tag: ....................
dmi.board.name: S1200RP
dmi.board.vendor: Intel Corporation
dmi.board.version: G62254-407
dmi.chassis.asset.tag: ....................
dmi.chassis.type: 17
dmi.chassis.vendor: ..............................
dmi.chassis.version: ..................
dmi.modalias: dmi:bvnIntelCorp.:bvrS1200RP.86B.03.02.0003.070120151022:bd07/01/2015:svnIntelCorporation:pnS1200RP:pvr....................:rvnIntelCorporation:rnS1200RP:rvrG62254-407:cvn..............................:ct17:cvr..................:
dmi.product.name: S1200RP
dmi.product.version: ....................
dmi.sys.vendor: Intel Corporation |
BugLink: https://bugs.launchpad.net/bugs/1775165
[Impact]
When userspace tasks which are processing fanotify permission events act
incorrectly, the fsnotify_mark_srcu SRCU is held indefinitely which causes
the whole notification subsystem to hang.
This has been seen in production, and it can also be seen when running the
Linux Test Project testsuite, specifically fanotify07.
[Fix]
Instead of holding the SRCU lock while waiting for userspace to respond,
which may never happen, or not in the order we are expecting, we drop the
fsnotify_mark_srcu SRCU lock before waiting for userspace response, and then
reacquire the lock again when userspace responds.
The fixes are from a series of upstream commits:
05f0e38724e8449184acd8fbf0473ee5a07adc6c (cherry-pick)
9385a84d7e1f658bb2d96ab798393e4b16268aaa (backport)
abc77577a669f424c5d0c185b9994f2621c52aa4 (backport)
The following are upstream commits necessary for the fixes to function:
35e481761cdc688dbee0ef552a13f49af8eba6cc (backport)
0918f1c309b86301605650c836ddd2021d311ae2 (cherry-pick)
[Testcase]
You can reproduce the problem pretty quickly with the Linux Test Project:
Steps (with root):
1. sudo apt-get install git xfsprogs -y
2. git clone --depth=1 https://github.com/linux-test-project/ltp.git
3. cd ltp
4. make autotools
5. ./configure
6. make; make install
7. cd /opt/ltp
8. echo -e "fanotify07 fanotify07 \nfanotify08 fanotify08" > /tmp/jobs
9. ./runltp -f /tmp/jobs
On a stock Xenial kernel, the system will hang, and the testcase will look like:
<<<test_start>>>
tag=fanotify07 stime=1554326200
cmdline="fanotify07 "
contacts=""
analysis=exit
<<<test_output>>>
tst_test.c:1096: INFO: Timeout per run is 0h 05m 00s
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Test timeouted, sending SIGKILL!
Cannot kill test processes!
Congratulation, likely test hit a kernel bug.
Exitting uncleanly...
<<<execution_status>>>
initiation_status="ok"
duration=350 termination_type=exited termination_id=1 corefile=no
cutime=0 cstime=0
<<<test_end>>>
Looking at dmesg, we see the following call stack
[ 790.772792] LTP: starting fanotify07 (fanotify07 )
[ 960.140455] INFO: task fsnotify_mark:36 blocked for more than 120 seconds.
[ 960.140867] Not tainted 4.4.0-142-generic #168-Ubuntu
[ 960.141185] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
[ 960.141498] fsnotify_mark D ffff8800b6703c98 0 36 2 0x00000000
[ 960.141516] ffff8800b6703c98 ffff88013a558a00 ffff8800b7797000 ffff8800b66f8000
[ 960.141524] ffff8800b6704000 7fffffffffffffff ffff8800b6703de0 ffff8800b66f8000
[ 960.141528] 0000000000000000 ffff8800b6703cb0 ffffffff8185cb45 ffff8800b6703de8
[ 960.141532] Call Trace:
[ 960.141580] [<ffffffff8185cb45>] schedule+0x35/0x80
[ 960.141588] [<ffffffff818600f4>] schedule_timeout+0x1b4/0x270
[ 960.141617] [<ffffffff810f57ac>] ? mod_timer+0x10c/0x240
[ 960.141621] [<ffffffff8185c60d>] ? __schedule+0x30d/0x810
[ 960.141625] [<ffffffff8185d652>] wait_for_completion+0xb2/0x190
[ 960.141636] [<ffffffff810b1f10>] ? wake_up_q+0x70/0x70
[ 960.141641] [<ffffffff810eb140>] __synchronize_srcu+0x100/0x1a0
[ 960.141645] [<ffffffff810ea400>] ? trace_raw_output_rcu_utilization+0x60/0x60
[ 960.141664] [<ffffffff81260870>] ? fsnotify_put_mark+0x40/0x40
[ 960.141669] [<ffffffff810eb204>] synchronize_srcu+0x24/0x30
[ 960.141672] [<ffffffff812608f4>] fsnotify_mark_destroy+0x84/0x130
[ 960.141680] [<ffffffff810ca000>] ? wake_atomic_t_function+0x60/0x60
[ 960.141691] [<ffffffff810a6227>] kthread+0xe7/0x100
[ 960.141694] [<ffffffff8185c601>] ? __schedule+0x301/0x810
[ 960.141699] [<ffffffff810a6140>] ? kthread_create_on_node+0x1e0/0x1e0
[ 960.141703] [<ffffffff818618e5>] ret_from_fork+0x55/0x80
[ 960.141706] [<ffffffff810a6140>] ? kthread_create_on_node+0x1e0/0x1e0
The vanilla 4.4 kernel also shows the same call stack.
On a patched kernel, the test will pass successfully, and there will be no
messages in dmesg.
[Regression Potential]
This makes modifications to how locking is performed in fsnotify / fanotify and
there may be some cause for regression. Running all fanotify Linux Test Project
tests shows that there are no extra failures caused by the patches, and instead
fewer failures are seen due to the bugfix.
Running the entire Linux Test Project testsuite actually works and runs to
completion, somewhich doesn't happen in a unpatched kernel since it will hang
on the fanotify07 test.
The patches are taken from upstream, and all necessary commits have been taken
into account, so I am happy with the potential risks and that testing has been
completed. |
|
| 2019-04-10 05:58:26 |
Po-Hsu Lin |
tags |
amd64 apport-bug ppc64le sts trusty uec-images |
amd64 apport-bug ppc64le sts trusty uec-images xenial |
|
| 2019-06-05 02:34:32 |
Po-Hsu Lin |
tags |
amd64 apport-bug ppc64le sts trusty uec-images xenial |
amd64 apport-bug ppc64el sts trusty uec-images xenial |
|
| 2019-07-15 02:29:50 |
Po-Hsu Lin |
linux (Ubuntu Trusty): status |
Triaged |
Won't Fix |
|
| 2019-07-15 02:29:56 |
Po-Hsu Lin |
linux (Ubuntu): status |
Triaged |
Fix Released |
|
| 2019-07-15 02:29:58 |
Po-Hsu Lin |
linux (Ubuntu Xenial): status |
In Progress |
Won't Fix |
|
| 2019-07-24 21:10:01 |
Brad Figg |
tags |
amd64 apport-bug ppc64el sts trusty uec-images xenial |
amd64 apport-bug cscc ppc64el sts trusty uec-images xenial |
|
| 2019-08-12 16:38:30 |
Sean Feole |
tags |
amd64 apport-bug cscc ppc64el sts trusty uec-images xenial |
amd64 apport-bug cscc linux-oracle oracle ppc64el sru-20190722 sts trusty uec-images xenial |
|
| 2019-08-19 10:54:24 |
Po-Hsu Lin |
summary |
fanotify07/fanotify08 in LTP syscall test generates kernel trace with T/X/X-AWS kernel |
fanotify07 in LTP syscall test generates kernel trace with T/X/X-AWS kernel |
|
| 2019-08-19 10:54:32 |
Po-Hsu Lin |
summary |
fanotify07 in LTP syscall test generates kernel trace with T/X/X-AWS kernel |
fanotify07 in LTP syscall test generates kernel trace with T/X kernel |
|
| 2019-08-23 08:56:38 |
Po-Hsu Lin |
ubuntu-kernel-tests: status |
New |
Fix Released |
|
| 2019-08-23 08:56:42 |
Po-Hsu Lin |
ubuntu-kernel-tests: assignee |
|
Po-Hsu Lin (cypressyew) |
|
| 2021-09-22 09:32:21 |
Po-Hsu Lin |
ubuntu-kernel-tests: status |
Fix Released |
Confirmed |
|
| 2021-09-22 09:32:24 |
Po-Hsu Lin |
ubuntu-kernel-tests: assignee |
Po-Hsu Lin (cypressyew) |
|
|
