(switched to email. Please respond via emailed reply-to-all, not via the bugzilla web interface). On Mon, 24 Oct 2016 01:27:15 +0000 bugzilla-daemon@xxxxxxxxxxxxxxxxxxx wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=180101 > > Bug ID: 180101 > Summary: BUG: unable to handle kernel paging request at x with > "mm: remove gup_flags FOLL_WRITE games from > __get_user_pages()" > Product: Memory Management > Version: 2.5 > Kernel Version: 4.8.4 > Hardware: x86-64 > OS: Linux > Tree: Mainline > Status: NEW > Severity: high > Priority: P1 > Component: Other > Assignee: akpm@xxxxxxxxxxxxxxxxxxxx > Reporter: joe.yasi@xxxxxxxxx > Regression: No > > After updating to 4.8.3 and 4.8.4, I am having stability issues. I can also > reproduce them with 4.7.10. This issue does not occur with 4.8.2. I can also > not reproduce after reverting the security fix > 89eeba1594ac641a30b91942961e80fae978f839 "mm: remove gup_flags FOLL_WRITE games > from __get_user_pages()" with 4.8.4. That's 19be0eaffa3ac7d8eb ("mm: remove gup_flags FOLL_WRITE games from __get_user_pages()") in the upstream tree. I seem to recall a fix for that patch went flying past earlier this week. Perhaps Linus recalls? 19be0eaffa3ac7d8eb has gone into a billion -stable trees so we'll need to be attentive... > This seems to happen when I'm doing an operation that mmaps a bunch of small > files like building the kernel or cross-compiling an image for my router. I've > been able to reliably reproduce it by running "sudo lsof +D /home" a few times > while building a kernel located in my /home partition. The /home partition is > btrfs on bcache. The bcache cache device is an Intel SATA SSD, and the backing > device is an MD RAID 1 array of two 3 TB hard drives. > > I tried to fix it by using the can_follow_write_pte function from the 3.2.83 > version of the patch (243f858d7045b710a31c377112578387ead4dde1) which checks > PageAnon and !PageKsm instead of pte_dirty, and can't reproduce the issue. If I > switch back to the mainline 4.8.4 version, I can reproduce it reliably. > > Any idea why pte_dirty is having an issue for me? Something in the > btrfs/bcache/md layer? > > This bug is triggered: > Oct 23 14:07:52 hostname kernel: [ 4880.464356] BUG: unable to handle kernel > paging request at 00007facb85592b6 > Oct 23 14:07:52 hostname kernel: [ 4880.464413] IP: [<ffffffffa1082731>] > queued_spin_lock_slowpath+0xe1/0x170 > Oct 23 14:07:52 hostname kernel: [ 4880.464463] PGD 7cee19067 PUD 0 > Oct 23 14:07:52 hostname kernel: [ 4880.464497] Oops: 0002 [#1] PREEMPT SMP > Oct 23 14:07:52 hostname kernel: [ 4880.464526] Modules linked in: pci_stub > vboxpci(O) vboxnetadp(O) vboxnetflt(O) vboxdrv(O) rfcomm bnep binfmt_misc vfat > fat snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic uvcvideo > videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core snd_usb_audio > videodev snd_usbmidi_lib media snd_hda_intel snd_hda_codec snd_hwdep > snd_hda_core snd_pcm_oss snd_mixer_oss snd_pcm input_leds intel_rapl > x86_pkg_temp_thermal btusb intel_powerclamp crct10dif_pclmul btrtl btbcm > efi_pstore crc32_pclmul btintel crc32c_intel bluetooth ghash_clmulni_intel > aesni_intel aes_x86_64 snd_seq_oss lrw glue_helper ablk_helper cryptd > intel_cstate snd_seq_midi snd_rawmidi intel_rapl_perf snd_seq_midi_event > snd_seq efivars snd_seq_device snd_timer snd soundcore wl(PO) cfg80211 rfkill > sg battery intel_lpss_acpi intel_lpss mfd_core acpi_pad tpm_tis acpi_als > tpm_tis_core kfifo_buf tpm industrialio nfsd auth_rpcgss coretemp oid_registry > nfs_acl lockd loop grace sunrpc efivarfs ipv6 crc_ccitt hid_generic usbhid uas > usb_storage igb e1000e dca ptp mxm_wmi bcache psmouse i915 intel_gtt pps_core > drm_kms_helper xhci_pci hwmon syscopyarea xhci_hcd sysfillrect sysimgblt > i2c_algo_bit fb_sys_fops usbcore sr_mod drm cdrom i2c_core usb_common fan > thermal pinctrl_sunrisepoint wmi video pinctrl_intel button > Oct 23 14:07:52 hostname kernel: [ 4880.465490] CPU: 3 PID: 1139 Comm: lsof > Tainted: P O 4.8.3-customskl #1 > Oct 23 14:07:52 hostname kernel: [ 4880.465540] Hardware name: System > manufacturer System Product Name/Z170-DELUXE, BIOS 2202 09/19/2016 > Oct 23 14:07:52 hostname kernel: [ 4880.465599] task: ffff9e4a40062640 > task.stack: ffff9e468ef80000 > Oct 23 14:07:52 hostname kernel: [ 4880.465643] RIP: 0010:[<ffffffffa1082731>] > [<ffffffffa1082731>] queued_spin_lock_slowpath+0xe1/0x170 > Oct 23 14:07:52 hostname kernel: [ 4880.465705] RSP: 0018:ffff9e468ef83d00 > EFLAGS: 00010202 > Oct 23 14:07:52 hostname kernel: [ 4880.465742] RAX: 0000000000001fff RBX: > ffff9e494f7f2718 RCX: ffff9e4b2ecd6ec0 > Oct 23 14:07:52 hostname kernel: [ 4880.465789] RDX: 00007facb85592b6 RSI: > 0000000080000000 RDI: ffff9e494f7f2718 > Oct 23 14:07:52 hostname kernel: [ 4880.465836] RBP: 0000000000000000 R08: > 0000000000100000 R09: 0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.465887] R10: 0000000020ab886e R11: > ffff9e494f7f26f8 R12: 0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.465934] R13: ffff9e494f7f26c0 R14: > ffff9e468ef83d90 R15: 0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.465981] FS: 00007f3344595800(0000) > GS:ffff9e4b2ecc0000(0000) knlGS:0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.466033] CS: 0010 DS: 0000 ES: 0000 > CR0: 0000000080050033 > Oct 23 14:07:52 hostname kernel: [ 4880.468745] CR2: 00007facb85592b6 CR3: > 00000007daf09000 CR4: 00000000003406e0 > Oct 23 14:07:52 hostname kernel: [ 4880.471484] DR0: 0000000000000000 DR1: > 0000000000000000 DR2: 0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.474221] DR3: 0000000000000000 DR6: > 00000000fffe0ff0 DR7: 0000000000000400 > Oct 23 14:07:52 hostname kernel: [ 4880.476930] Stack: > Oct 23 14:07:52 hostname kernel: [ 4880.479644] ffffffffa13680aa > 0000000000000000 ffff9e494f7f26c0 ffffffffa1162f3e > Oct 23 14:07:52 hostname kernel: [ 4880.482419] ffff9e468ef83d90 > ffff9e494f7f26c0 ffff9e468ef83ea0 0000000000000000 > Oct 23 14:07:52 hostname kernel: [ 4880.485205] ffff9e468ef83ea0 > ffffffffa11632de ffff9e468ef83d90 ffff9e468ef83d80 > Oct 23 14:07:52 hostname kernel: [ 4880.487984] Call Trace: > Oct 23 14:07:52 hostname kernel: [ 4880.490774] [<ffffffffa13680aa>] ? > lockref_get_not_dead+0x3a/0x80 > Oct 23 14:07:52 hostname kernel: [ 4880.493558] [<ffffffffa1162f3e>] ? > unlazy_walk+0xee/0x180 > Oct 23 14:07:52 hostname kernel: [ 4880.496362] [<ffffffffa11632de>] ? > complete_walk+0x2e/0x70 > Oct 23 14:07:52 hostname kernel: [ 4880.499166] [<ffffffffa1165453>] ? > path_lookupat+0x93/0x100 > Oct 23 14:07:52 hostname kernel: [ 4880.501977] [<ffffffffa1167859>] ? > filename_lookup+0x99/0x150 > Oct 23 14:07:52 hostname kernel: [ 4880.504767] [<ffffffffa1160d0e>] ? > pipe_read+0x27e/0x340 > Oct 23 14:07:52 hostname kernel: [ 4880.507550] [<ffffffffa11674fa>] ? > getname_flags+0x6a/0x1d0 > Oct 23 14:07:52 hostname kernel: [ 4880.510278] [<ffffffffa115d4c4>] ? > vfs_fstatat+0x44/0x90 > Oct 23 14:07:52 hostname kernel: [ 4880.513049] [<ffffffffa115d96d>] ? > SYSC_newlstat+0x1d/0x40 > Oct 23 14:07:52 hostname kernel: [ 4880.515844] [<ffffffffa1158b12>] ? > vfs_read+0x112/0x130 > Oct 23 14:07:52 hostname kernel: [ 4880.518654] [<ffffffffa1159d7d>] ? > SyS_read+0x3d/0x90 > Oct 23 14:07:52 hostname kernel: [ 4880.521437] [<ffffffffa15ff41f>] ? > entry_SYSCALL_64_fastpath+0x17/0x93 > Oct 23 14:07:52 hostname kernel: [ 4880.524245] Code: c1 e0 10 45 31 c9 85 c0 > 74 44 48 89 c2 c1 e8 12 48 c1 ea 0c 83 e8 01 83 e2 30 48 98 48 81 c2 c0 6e 01 > 00 48 03 14 c5 a0 21 a7 a1 <48> 89 0a 8b 41 08 85 c0 75 09 f3 90 8b 41 08 85 c0 > 74 f7 4c 8b > Oct 23 14:07:52 hostname kernel: [ 4880.527307] RIP [<ffffffffa1082731>] > queued_spin_lock_slowpath+0xe1/0x170 > Oct 23 14:07:52 hostname kernel: [ 4880.530277] RSP <ffff9e468ef83d00> > Oct 23 14:07:52 hostname kernel: [ 4880.533247] CR2: 00007facb85592b6 > Oct 23 14:07:52 hostname kernel: [ 4880.536159] ---[ end trace 78d7ef040dfa41d9 > ]--- > Oct 23 14:07:52 hostname kernel: [ 4880.638571] note: lsof[1139] exited with > preempt_count 1 > Oct 23 14:08:52 hostname kernel: [ 4940.464837] INFO: rcu_preempt detected > stalls on CPUs/tasks: > Oct 23 14:08:52 hostname kernel: [ 4940.468014] Tasks blocked on level-0 > rcu_node (CPUs 0-7): P1139 > Oct 23 14:08:52 hostname kernel: [ 4940.471228] (detected by 2, t=60002 > jiffies, g=469992, c=469991, q=109361) > Oct 23 14:08:52 hostname kernel: [ 4940.474458] lsof x > 0000000000030001 0 1139 0 0x00000002 > Oct 23 14:08:52 hostname kernel: [ 4940.477714] ffff9e4a40062640 > ffff9e4796162e00 ffff9e4a40062640 ffff9e468ef84000 > Oct 23 14:08:52 hostname kernel: [ 4940.480966] ffff9e468ef83f10 > ffff9e468ef83b18 ffff9e4a40062a00 00007facb85592b6 > Oct 23 14:08:52 hostname kernel: [ 4940.484228] 0000000000030001 > ffffffffa15fb513 ffff9e4a40062640 ffffffffa104e5c8 > Oct 23 14:08:52 hostname kernel: [ 4940.487471] Call Trace: > Oct 23 14:08:52 hostname kernel: [ 4940.490683] [<ffffffffa15fb513>] ? > schedule+0x33/0x90 > Oct 23 14:08:52 hostname kernel: [ 4940.493919] [<ffffffffa104e5c8>] ? > do_exit+0x708/0xac0 > Oct 23 14:08:52 hostname kernel: [ 4940.497169] [<ffffffffa1600d47>] ? > rewind_stack_do_exit+0x17/0x20 > Oct 23 14:08:52 hostname kernel: [ 4940.500409] lsof x > 0000000000030001 0 1139 0 0x00000002 > Oct 23 14:08:52 hostname kernel: [ 4940.503676] ffff9e4a40062640 > ffff9e4796162e00 ffff9e4a40062640 ffff9e468ef84000 > Oct 23 14:08:52 hostname kernel: [ 4940.506964] ffff9e468ef83f10 > ffff9e468ef83b18 ffff9e4a40062a00 00007facb85592b6 > Oct 23 14:08:52 hostname kernel: [ 4940.510230] 0000000000030001 > ffffffffa15fb513 ffff9e4a40062640 ffffffffa104e5c8 > Oct 23 14:08:52 hostname kernel: [ 4940.513532] Call Trace: > Oct 23 14:08:52 hostname kernel: [ 4940.516807] [<ffffffffa15fb513>] ? > schedule+0x33/0x90 > Oct 23 14:08:52 hostname kernel: [ 4940.520129] [<ffffffffa104e5c8>] ? > do_exit+0x708/0xac0 > Oct 23 14:08:52 hostname kernel: [ 4940.523457] [<ffffffffa1600d47>] ? > rewind_stack_do_exit+0x17/0x20 > Oct 23 14:10:10 hostname kernel: [ 5018.824396] INFO: rcu_sched self-detected > stall on CPU > Oct 23 14:10:10 hostname kernel: [ 5018.826669] 2-...: (59999 ticks this > GP) idle=609/140000000000001/0 softirq=954063/954063 fqs=15000 > Oct 23 14:10:10 hostname kernel: [ 5018.828924] (t=60000 jiffies g=333 > c=332 q=1) > Oct 23 14:10:10 hostname kernel: [ 5018.831185] Task dump for CPU 2: > Oct 23 14:10:10 hostname kernel: [ 5018.833406] lsof R running task > 0 1213 1 0x0000000c > Oct 23 14:10:10 hostname kernel: [ 5018.835688] ffffffffa1a29f80 > ffffffffa10ed903 ffff9e4b2ec97240 ffffffffa1a29f80 > Oct 23 14:10:10 hostname kernel: [ 5018.837940] 0000000000000000 > ffff9e4a13a9cc80 ffffffffa109c05a ffffffffa10a45f9 > Oct 23 14:10:10 hostname kernel: [ 5018.840205] 003b9aca00000000 > ffff9e4b2ec83ee0 0000000000000086 ffffffffa10a5c5c > Oct 23 14:10:10 hostname kernel: [ 5018.842491] Call Trace: > Oct 23 14:10:10 hostname kernel: [ 5018.844706] <IRQ> [<ffffffffa10ed903>] ? > rcu_dump_cpu_stacks+0x88/0xaa > Oct 23 14:10:10 hostname kernel: [ 5018.846997] [<ffffffffa109c05a>] ? > rcu_check_callbacks+0x69a/0x8d0 > Oct 23 14:10:10 hostname kernel: [ 5018.849251] [<ffffffffa10a45f9>] ? > timekeeping_update+0xe9/0x140 > Oct 23 14:10:10 hostname kernel: [ 5018.851535] [<ffffffffa10a5c5c>] ? > update_wall_time+0x45c/0x770 > Oct 23 14:10:10 hostname kernel: [ 5018.853790] [<ffffffffa10accb0>] ? > tick_sched_handle.isra.14+0x30/0x30 > Oct 23 14:10:10 hostname kernel: [ 5018.856086] [<ffffffffa109ef73>] ? > update_process_times+0x23/0x50 > Oct 23 14:10:10 hostname kernel: [ 5018.858336] [<ffffffffa10acce3>] ? > tick_sched_timer+0x33/0x60 > Oct 23 14:10:10 hostname kernel: [ 5018.860593] [<ffffffffa109f9a9>] ? > __hrtimer_run_queues+0xb9/0x150 > Oct 23 14:10:10 hostname kernel: [ 5018.862810] [<ffffffffa109fc35>] ? > hrtimer_interrupt+0x95/0x190 > Oct 23 14:10:10 hostname kernel: [ 5018.865048] [<ffffffffa10327de>] ? > smp_trace_apic_timer_interrupt+0x5e/0x90 > Oct 23 14:10:10 hostname kernel: [ 5018.867302] [<ffffffffa160000f>] ? > apic_timer_interrupt+0x7f/0x90 > Oct 23 14:10:10 hostname kernel: [ 5018.869557] <EOI> [<ffffffffa108273d>] ? > queued_spin_lock_slowpath+0xed/0x170 > Oct 23 14:10:10 hostname kernel: [ 5018.871826] [<ffffffffa13680aa>] ? > lockref_get_not_dead+0x3a/0x80 > Oct 23 14:10:10 hostname kernel: [ 5018.874097] [<ffffffffa1162f3e>] ? > unlazy_walk+0xee/0x180 > Oct 23 14:10:10 hostname kernel: [ 5018.876372] [<ffffffffa11632de>] ? > complete_walk+0x2e/0x70 > Oct 23 14:10:10 hostname kernel: [ 5018.878684] [<ffffffffa1165453>] ? > path_lookupat+0x93/0x100 > Oct 23 14:10:10 hostname kernel: [ 5018.880953] [<ffffffffa1167859>] ? > filename_lookup+0x99/0x150 > Oct 23 14:10:10 hostname kernel: [ 5018.883225] [<ffffffffa1160d0e>] ? > pipe_read+0x27e/0x340 > Oct 23 14:10:10 hostname kernel: [ 5018.885532] [<ffffffffa11674fa>] ? > getname_flags+0x6a/0x1d0 > Oct 23 14:10:10 hostname kernel: [ 5018.887824] [<ffffffffa115d4c4>] ? > vfs_fstatat+0x44/0x90 > Oct 23 14:10:10 hostname kernel: [ 5018.890126] [<ffffffffa115d96d>] ? > SYSC_newlstat+0x1d/0x40 > Oct 23 14:10:10 hostname kernel: [ 5018.892443] [<ffffffffa1158b12>] ? > vfs_read+0x112/0x130 > Oct 23 14:10:10 hostname kernel: [ 5018.894717] [<ffffffffa1159d7d>] ? > SyS_read+0x3d/0x90 > Oct 23 14:10:10 hostname kernel: [ 5018.896912] [<ffffffffa15ff41f>] ? > entry_SYSCALL_64_fastpath+0x17/0x93 > > -- > You are receiving this mail because: > You are the assignee for the bug. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. 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