[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
This bug was fixed in the package linux - 4.18.0-20.21 --- linux (4.18.0-20.21) cosmic; urgency=medium * CVE-2018-12126 // CVE-2018-12127 // CVE-2018-12130 - Documentation/l1tf: Fix small spelling typo - x86/cpu: Sanitize FAM6_ATOM naming - kvm: x86: Report STIBP on GET_SUPPORTED_CPUID - locking/atomics, asm-generic: Move some macros from to a new file - tools include: Adopt linux/bits.h - x86/msr-index: Cleanup bit defines - x86/speculation: Consolidate CPU whitelists - x86/speculation/mds: Add basic bug infrastructure for MDS - x86/speculation/mds: Add BUG_MSBDS_ONLY - x86/kvm: Expose X86_FEATURE_MD_CLEAR to guests - x86/speculation/mds: Add mds_clear_cpu_buffers() - x86/speculation/mds: Clear CPU buffers on exit to user - x86/kvm/vmx: Add MDS protection when L1D Flush is not active - x86/speculation/mds: Conditionally clear CPU buffers on idle entry - x86/speculation/mds: Add mitigation control for MDS - x86/speculation/mds: Add sysfs reporting for MDS - x86/speculation/mds: Add mitigation mode VMWERV - Documentation: Move L1TF to separate directory - Documentation: Add MDS vulnerability documentation - x86/speculation/mds: Add mds=full,nosmt cmdline option - x86/speculation: Move arch_smt_update() call to after mitigation decisions - x86/speculation/mds: Add SMT warning message - x86/speculation/mds: Fix comment - x86/speculation/mds: Print SMT vulnerable on MSBDS with mitigations off - x86/speculation/mds: Add 'mitigations=' support for MDS * CVE-2017-5715 // CVE-2017-5753 - s390/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5753 // CVE-2017-5754 // CVE-2018-3639 - powerpc/speculation: Support 'mitigations=' cmdline option * CVE-2017-5715 // CVE-2017-5754 // CVE-2018-3620 // CVE-2018-3639 // CVE-2018-3646 - cpu/speculation: Add 'mitigations=' cmdline option - x86/speculation: Support 'mitigations=' cmdline option * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log linux (4.18.0-19.20) cosmic; urgency=medium * linux: 4.18.0-19.20 -proposed tracker (LP: #1826171) * Packaging resync (LP: #1786013) - [Packaging] resync git-ubuntu-log * autopkgtests run too often, too much and don't skip enough (LP: #1823056) - [Debian] Set +x on rebuild testcase. - [Debian] Skip rebuild test, for regression-suite deps. - [Debian] Make ubuntu-regression-suite skippable on unbootable kernels. - [Debian] make rebuild use skippable error codes when skipping. - [Debian] Only run regression-suite, if requested to. * CVE-2017-5753 - s390/keyboard: sanitize array index in do_kdsk_ioctl - drm/bufs: Fix Spectre v1 vulnerability - drivers/misc/sgi-gru: fix Spectre v1 vulnerability - ipv4: Fix potential Spectre v1 vulnerability - aio: fix spectre gadget in lookup_ioctx - ALSA: emux: Fix potential Spectre v1 vulnerabilities - ALSA: pcm: Fix potential Spectre v1 vulnerability - ip6mr: Fix potential Spectre v1 vulnerability - ALSA: rme9652: Fix potential Spectre v1 vulnerability - ALSA: emu10k1: Fix potential Spectre v1 vulnerabilities - KVM: arm/arm64: vgic: Fix off-by-one bug in vgic_get_irq() - drm/ioctl: Fix Spectre v1 vulnerabilities - net: core: Fix Spectre v1 vulnerability - phonet: af_phonet: Fix Spectre v1 vulnerability - nfc: af_nfc: Fix Spectre v1 vulnerability - can: af_can: Fix Spectre v1 vulnerability - net: Revert recent Spectre-v1 patches. - char/mwave: fix potential Spectre v1 vulnerability - applicom: Fix potential Spectre v1 vulnerabilities - ipmi: msghandler: Fix potential Spectre v1 vulnerabilities - powerpc/ptrace: Mitigate potential Spectre v1 - cfg80211: prevent speculation on cfg80211_classify8021d() return - ALSA: rawmidi: Fix potential Spectre v1 vulnerability - ALSA: seq: oss: Fix Spectre v1 vulnerability * NULL pointer dereference when using z3fold and zswap (LP: #1814874) - z3fold: fix possible reclaim races * The Realtek card reader does not enter PCIe 1.1/1.2 (LP: #1825487) - misc: rtsx: Enable OCP for rts522a rts524a rts525a rts5260 - SAUCE: misc: rtsx: Fixed rts5260 power saving parameter and sd glitch * headset-mic doesn't work on two Dell laptops. (LP: #1825272) - ALSA: hda/realtek - add two more pin configuration sets to quirk table * CVE-2018-16884 - sunrpc: use SVC_NET() in svcauth_gss_* functions - sunrpc: use-after-free in svc_process_common() * AMD Rome : Minimal support patches (LP: #1816669) - x86: irq_remapping: Move irq remapping mode enum - iommu/amd: Add support for higher 64-bit IOMMU Control Register - iommu/amd: Add support for IOMMU XT mode * sky2 ethernet card don't work after returning from suspension (LP: #1798921) - sky2: Increase D3 delay again * CVE-2019-9500 - brcmfmac: assure
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
** Attachment added: "kprobe-test.c" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5259304/+files/kprobe-test.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
Verification successful on Cosmic.
Updated the test-case kernel part (attached), and repeated it 20+ times,
without any process hanging.
In all cases, the new function call into write_cache_pages() is observed
in thread 0, between page index 2 and page index 1.
[ 150.914872] mod_init():161 :: hello
[ 150.917828] mod_init():207 :: kernel version: prop/-19/cosmic
[ 150.950322] Program running, TID = 1429
[ 150.951566] kp1_pre_handler():073 :: state 0 :: pid = 1429, mapping =
0x8abcba385570, comm = 'test'
[ 150.954205] kp1_pre_handler():082 :: state 0 -> 1 :: pid = 1429, mapping =
0x8abcba385570
[ 150.956518] kp2_pre_handler():122 :: state 1 :: pid = 1429, page
index = 1
[ 150.958410] kp3_pre_handler():147 :: state 1 :: pid = 1429, page
index = 1, calling writepage()
[ 150.961047] kp2_pre_handler():122 :: state 1 :: pid = 1429, page
index = 2
[ 150.964788] kp3_pre_handler():147 :: state 1 :: pid = 1429, page
index = 2, calling writepage()
[ 151.973660] Thread 0 running, TID = 1430!
[ 151.977071] kp1_pre_handler():073 :: state 1 :: pid = 7, mapping =
0x8abcba385570, comm = 'kworker/u8:0'
[ 151.984836] kp1_pre_handler():104 :: state 1 -> 2 :: pid = 7, mapping =
0x8abcba385570, comm ('kworker/u8:0') is kworker AND wbc->range_cyclic
(0x1) is true AND mapping->writeback_index (0x2) is 0x2.
[ 152.017726] kp2_pre_handler():122 :: state 2 :: pid = 7, page
index = 2
[ 152.027193] kp3_pre_handler():147 :: state 2 :: pid = 7, page
index = 2, calling writepage()
[ 152.038466] kp1_pre_handler():073 :: state 2 :: pid = 7, mapping =
0x8abcba385570, comm = 'kworker/u8:0'
[ 152.048736] kp2_pre_handler():122 :: state 2 :: pid = 7, page
index = 1
[ 152.056642] kp2_pre_handler():126 :: state 2 -> 3 :: pid = 7, page
index = 1, spin 5 seconds before lock_page()...
[ 152.973731] Thread 1 running, TID = 1431!
[ 152.974943] kp1_pre_handler():073 :: state 3 :: pid = 1431, mapping =
0x8abcba385570, comm = 'test'
[ 152.977489] kp2_pre_handler():122 :: state 3 :: pid = 1431, page
index = 1
[ 152.979140] kp3_pre_handler():147 :: state 3 :: pid = 1431, page
index = 1, calling writepage()
[ 152.981928] kp2_pre_handler():122 :: state 3 :: pid = 1431, page
index = 2
[ 153.973895] Thread 2 running, TID = 1432!
[ 153.975160] kp1_pre_handler():073 :: state 3 :: pid = 1432, mapping =
0x8abcba385570, comm = 'test'
[ 153.978573] kp2_pre_handler():122 :: state 3 :: pid = 1432, page
index = 1
[ 157.033588] kp2_pre_handler():130 :: state 3 -> 4 :: pid = 7, page
index = 1, spun 5 seconds before lock_page().
[ 157.036151] kp3_pre_handler():147 :: state 4 :: pid = 1431, page
index = 2, calling writepage()
[ 157.038804] kp3_pre_handler():147 :: state 4 :: pid = 1432, page
index = 1, calling writepage()
[ 157.041212] kp2_pre_handler():122 :: state 4 :: pid = 1432, page
index = 2
[ 157.058880] mod_exit():230 :: bye
** Tags removed: verification-needed-cosmic
** Tags added: verification-done-cosmic
** Attachment removed: "kprobe-test.c"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5255994/+files/kprobe-test.c
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Title:
tasks doing write()/fsync() hit deadlock in write_cache_pages()
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[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- cosmic' to 'verification-done-cosmic'. If the problem still exists, change the tag 'verification-needed-cosmic' to 'verification-failed- cosmic'. If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-cosmic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
** Changed in: linux (Ubuntu Cosmic) Status: In Progress => Fix Committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
The change introduced by the patch is evident in the kernel message log for
Thread 0:
between page indexes 2 and 1 there's now another function call to
write_cache_pages()
instead of just another iteration of the for-loop inside one call.
Original kernel:
[ 695.276320] Thread 0 running, TID = 3293!
[ 695.281210] kp1_pre_handler():070 :: state 1 :: pid = 1165, mapping =
0x962333263730, comm = 'kworker/u4:2'
[ 695.299026] kp1_pre_handler():101 :: state 1 -> 2 :: pid = 1165, mapping =
0x962333263730, comm ('kworker/u4:2') is kworker AND wbc->range_cyclic
(0x1) is true AND mapping->writeback_index (0x2) is 0x2.
[ 695.314808] kp2_pre_handler():119 :: state 2 :: pid = 1165, page index =
2
[ 695.322822] kp3_pre_handler():144 :: state 2 :: pid = 1165, page index =
2, calling writepage()
<< ... HERE ... >>
[ 695.330308] kp2_pre_handler():119 :: state 2 :: pid = 1165, page index =
1
[ 695.334355] kp2_pre_handler():123 :: state 2 -> 3 :: pid = 1165, page index =
1, spin 5 seconds before lock_page()...
Test kernel:
[ 170.194880] Thread 0 running, TID = 2498!
[ 170.200011] kp1_pre_handler():070 :: state 1 :: pid = 7, mapping =
0x993df9136fb0, comm = 'kworker/u4:0'
[ 170.217616] kp1_pre_handler():101 :: state 1 -> 2 :: pid = 7, mapping =
0x993df9136fb0, comm ('kworker/u4:0') is kworker AND wbc->range_cyclic
(0x1) is true AND mapping->writeback_index (0x2) is 0x2.
[ 170.238633] kp2_pre_handler():119 :: state 2 :: pid = 7, page index = 2
[ 170.248024] kp3_pre_handler():144 :: state 2 :: pid = 7, page index = 2,
calling writepage()
[ 170.261141] kp1_pre_handler():070 :: state 2 :: pid = 7, mapping =
0x993df9136fb0, comm = 'kworker/u4:0'
[ 170.272150] kp2_pre_handler():119 :: state 2 :: pid = 7, page index = 1
[ 170.279860] kp2_pre_handler():123 :: state 2 -> 3 :: pid = 7, page index = 1,
spin 5 seconds before lock_page()...
** Changed in: linux (Ubuntu Cosmic)
Status: Confirmed => In Progress
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Title:
tasks doing write()/fsync() hit deadlock in write_cache_pages()
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[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
Patch posted for SRU: [C][PATCH 0/1] Fix write()/fsync() deadlock in write_cache_pages() https://lists.ubuntu.com/archives/kernel-team/2019-April/100084.html -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
testcase, kernel part. ** Attachment added: "kprobe-test.c" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5255994/+files/kprobe-test.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
testcase
test kernel :: latest cosmic version + patch:
$ uname -rv
4.18.0-18-generic #19+test20190415b1 SMP Mon Apr 15 15:43:20 UTC 2019
[ 169.145212] kprobe_test: loading out-of-tree module taints kernel.
[ 169.149144] kprobe_test: module verification failed: signature and/or
required key missing - tainting kernel
[ 169.153539] mod_init():158 :: hello
[ 169.154744] mod_init():190 :: kernel version: test/-18/cosmic
[ 169.177027] Program running, TID = 2497
[ 169.177978] kp1_pre_handler():070 :: state 0 :: pid = 2497, mapping =
0x993df9136fb0, comm = 'test'
[ 169.181080] kp1_pre_handler():079 :: state 0 -> 1 :: pid = 2497, mapping =
0x993df9136fb0
[ 169.183355] kp2_pre_handler():119 :: state 1 :: pid = 2497, page
index = 1
[ 169.185616] kp3_pre_handler():144 :: state 1 :: pid = 2497, page
index = 1, calling writepage()
[ 169.187779] kp2_pre_handler():119 :: state 1 :: pid = 2497, page
index = 2
[ 169.189186] kp3_pre_handler():144 :: state 1 :: pid = 2497, page
index = 2, calling writepage()
[ 170.194880] Thread 0 running, TID = 2498!
[ 170.200011] kp1_pre_handler():070 :: state 1 :: pid = 7, mapping =
0x993df9136fb0, comm = 'kworker/u4:0'
[ 170.217616] kp1_pre_handler():101 :: state 1 -> 2 :: pid = 7, mapping =
0x993df9136fb0, comm ('kworker/u4:0') is kworker AND wbc->range_cyclic
(0x1) is true AND mapping->writeback_index (0x2) is 0x2.
[ 170.238633] kp2_pre_handler():119 :: state 2 :: pid = 7, page
index = 2
[ 170.248024] kp3_pre_handler():144 :: state 2 :: pid = 7, page
index = 2, calling writepage()
[ 170.261141] kp1_pre_handler():070 :: state 2 :: pid = 7, mapping =
0x993df9136fb0, comm = 'kworker/u4:0'
[ 170.272150] kp2_pre_handler():119 :: state 2 :: pid = 7, page
index = 1
[ 170.279860] kp2_pre_handler():123 :: state 2 -> 3 :: pid = 7, page
index = 1, spin 5 seconds before lock_page()...
[ 171.195090] Thread 1 running, TID = 2499!
[ 171.196182] kp1_pre_handler():070 :: state 3 :: pid = 2499, mapping =
0x993df9136fb0, comm = 'test'
[ 171.198609] kp2_pre_handler():119 :: state 3 :: pid = 2499, page
index = 1
[ 171.200358] kp3_pre_handler():144 :: state 3 :: pid = 2499, page
index = 1, calling writepage()
[ 171.203717] kp2_pre_handler():119 :: state 3 :: pid = 2499, page
index = 2
[ 172.195297] Thread 2 running, TID = 2500!
[ 172.196387] kp1_pre_handler():070 :: state 3 :: pid = 2500, mapping =
0x993df9136fb0, comm = 'test'
[ 172.198673] kp2_pre_handler():119 :: state 3 :: pid = 2500, page
index = 1
[ 175.252161] kp2_pre_handler():127 :: state 3 -> 4 :: pid = 7, page
index = 1, spun 5 seconds before lock_page().
[ 175.254922] kp3_pre_handler():144 :: state 4 :: pid = 2499, page
index = 2, calling writepage()
[ 175.256849] kp3_pre_handler():144 :: state 4 :: pid = 2500, page
index = 1, calling writepage()
[ 175.259166] kp2_pre_handler():119 :: state 4 :: pid = 2500, page
index = 2
[ 175.273178] mod_exit():213 :: bye
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Title:
tasks doing write()/fsync() hit deadlock in write_cache_pages()
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[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
testcase
original kernel :: latest cosmic version:
$ uname -rv
4.18.0-18-generic #19-Ubuntu SMP Tue Apr 2 18:13:16 UTC 2019
[ 654.491029] kprobe_test: loading out-of-tree module taints kernel.
[ 654.493322] kprobe_test: module verification failed: signature and/or
required key missing - tainting kernel
[ 654.497033] mod_init():158 :: hello
[ 654.497976] mod_init():183 :: kernel version: orig/-18/cosmic
[ 694.254271] Program running, TID = 3292
[ 694.256600] kp1_pre_handler():070 :: state 0 :: pid = 3292, mapping =
0x962333263730, comm = 'test'
[ 694.260870] kp1_pre_handler():079 :: state 0 -> 1 :: pid = 3292, mapping =
0x962333263730
[ 694.262710] kp2_pre_handler():119 :: state 1 :: pid = 3292, page
index = 1
[ 694.264264] kp3_pre_handler():144 :: state 1 :: pid = 3292, page
index = 1, calling writepage()
[ 694.266641] kp2_pre_handler():119 :: state 1 :: pid = 3292, page
index = 2
[ 694.268456] kp3_pre_handler():144 :: state 1 :: pid = 3292, page
index = 2, calling writepage()
[ 695.276320] Thread 0 running, TID = 3293!
[ 695.281210] kp1_pre_handler():070 :: state 1 :: pid = 1165, mapping =
0x962333263730, comm = 'kworker/u4:2'
[ 695.299026] kp1_pre_handler():101 :: state 1 -> 2 :: pid = 1165, mapping =
0x962333263730, comm ('kworker/u4:2') is kworker AND wbc->range_cyclic
(0x1) is true AND mapping->writeback_index (0x2) is 0x2.
[ 695.314808] kp2_pre_handler():119 :: state 2 :: pid = 1165, page
index = 2
[ 695.322822] kp3_pre_handler():144 :: state 2 :: pid = 1165, page
index = 2, calling writepage()
[ 695.330308] kp2_pre_handler():119 :: state 2 :: pid = 1165, page
index = 1
[ 695.334355] kp2_pre_handler():123 :: state 2 -> 3 :: pid = 1165, page
index = 1, spin 5 seconds before lock_page()...
[ 696.283747] Thread 1 running, TID = 3295!
[ 696.284623] kp1_pre_handler():070 :: state 3 :: pid = 3295, mapping =
0x962333263730, comm = 'test'
[ 696.286726] kp2_pre_handler():119 :: state 3 :: pid = 3295, page
index = 1
[ 696.288392] kp3_pre_handler():144 :: state 3 :: pid = 3295, page
index = 1, calling writepage()
[ 696.290018] kp2_pre_handler():119 :: state 3 :: pid = 3295, page
index = 2
[ 697.283941] Thread 2 running, TID = 3296!
[ 697.284859] kp1_pre_handler():070 :: state 3 :: pid = 3296, mapping =
0x962333263730, comm = 'test'
[ 697.287246] kp2_pre_handler():119 :: state 3 :: pid = 3296, page
index = 1
[ 700.302756] kp2_pre_handler():127 :: state 3 -> 4 :: pid = 1165, page
index = 1, spun 5 seconds before lock_page().
[ 715.716717] INFO: task kworker/u4:2:1165 blocked for more than 10 seconds.
[ 715.725486] Tainted: G OE 4.18.0-18-generic #19-Ubuntu
[ 715.732832] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 715.740500] kworker/u4:2D0 1165 2 0x8000
[ 715.745615] Workqueue: writeback wb_workfn (flush-7:1)
[ 715.750736] Call Trace:
[ 715.753270] __schedule+0x29e/0x840
[ 715.756493] schedule+0x2c/0x80
[ 715.759369] io_schedule+0x16/0x40
[ 715.762044] __lock_page+0x101/0x150
[ 715.764729] ? page_cache_tree_insert+0xe0/0xe0
[ 715.773625] write_cache_pages+0x283/0x4e0
[ 715.782547] ? xfs_vm_readpage+0x80/0x80 [xfs]
[ 715.792525] ? xfs_vm_readpage+0x80/0x80 [xfs]
[ 715.798175] ? write_cache_pages+0x5/0x4e0
[ 715.803180] xfs_vm_writepages+0x6b/0xa0 [xfs]
[ 715.807087] do_writepages+0x41/0xd0
[ 715.810416] __writeback_single_inode+0x40/0x360
[ 715.813588] ? fprop_fraction_percpu+0x26/0x80
[ 715.816686] writeback_sb_inodes+0x211/0x520
[ 715.819584] __writeback_inodes_wb+0x67/0xb0
[ 715.822661] wb_writeback+0x25f/0x2f0
[ 715.824963] ? get_nr_dirty_inodes+0x46/0x70
[ 715.827180] wb_workfn+0x175/0x3f0
[ 715.829225] process_one_work+0x20f/0x410
[ 715.830964] worker_thread+0x34/0x400
[ 715.832646] kthread+0x120/0x140
[ 715.834551] ? pwq_unbound_release_workfn+0xd0/0xd0
[ 715.836902] ? kthread_bind+0x40/0x40
[ 715.838772] ret_from_fork+0x35/0x40
[ 715.840579] INFO: task test:3293 blocked for more than 10 seconds.
[ 715.842927] Tainted: G OE 4.18.0-18-generic #19-Ubuntu
[ 715.845279] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this
message.
[ 715.847771] testD0 3293 3291 0x
[ 715.849826] Call Trace:
[ 715.851266] __schedule+0x29e/0x840
[ 715.853289] schedule+0x2c/0x80
[ 715.855069] wb_wait_for_completion+0x64/0x90
[ 715.857179] ? wait_woken+0x80/0x80
[ 715.858973] sync_inodes_sb+0xc7/0x290
[ 715.860754] sync_inodes_one_sb+0x15/0x20
[ 715.862383] iterate_supers+0xaa/0x100
[ 715.863938] ? default_file_splice_write+0x30/0x30
[ 715.865666] ksys_sync+0x42/0xb0
[ 715.867082] __ia32_sys_sync+0xe/0x20
[ 715.869122] do_syscall_64+0x5a/0x110
[ 715.871041] entry_SYSCALL_64_after_hw
[Bug 1824827] Re: tasks doing write()/fsync() hit deadlock in write_cache_pages()
testcase, userspace part. ** Attachment added: "test.c" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+attachment/5255995/+files/test.c -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1824827 Title: tasks doing write()/fsync() hit deadlock in write_cache_pages() To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1824827/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
