[Bug 112161] New: workqueue: PF_MEMALLOC task 297(kswapd0) is flushing !WQ_MEM_RECLAIM events:gen6_pm_rps_work

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Oct 28 19:08:41 UTC 2019 

https://bugs.freedesktop.org/show_bug.cgi?id=112161

            Bug ID: 112161
           Summary: workqueue: PF_MEMALLOC task 297(kswapd0) is flushing
                    !WQ_MEM_RECLAIM events:gen6_pm_rps_work
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: not set
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: kenny at panix.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org
     i915 platform: CFL

I've been getting this from time-to-time. Not sure if it helps you guys.

This is Linus' tip kernel as of 27 October, with all recent i915 changes
reverted to pre August 2019 status (as drm-next merge causes frequent GPU HANGs
that make my system useless).

----
[code]Oct 28 11:59:18 hp-x360n kernel: [156262.539119] ------------[ cut here
]------------
Oct 28 11:59:18 hp-x360n kernel: [156262.539139] workqueue: PF_MEMALLOC task
297(kswapd0) is flushing !WQ_MEM_RECLAIM events:gen6_pm_rps_work [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539143] WARNING: CPU: 5 PID: 297 at
kernel/workqueue.c:2600 check_flush_dependency+0x9d/0x130
Oct 28 11:59:18 hp-x360n kernel: [156262.539145] Modules linked in: r8152
wireguard(O) vmnet(O) vsock(O) vmw_vmci vmmon(O) btusb btintel iwlmvm mac80211
iwlwifi mei_hdcp cfg80211 i915
Oct 28 11:59:18 hp-x360n kernel: [156262.539151] CPU: 5 PID: 297 Comm: kswapd0
Tainted: G     U  W  O      5.4.0-rc4-Kenny-old-DRM+ #3
Oct 28 11:59:18 hp-x360n kernel: [156262.539152] Hardware name: HP HP Spectre
x360 Convertible 13-ap0xxx/8514, BIOS F.33 09/17/2019
Oct 28 11:59:18 hp-x360n kernel: [156262.539153] RIP:
0010:check_flush_dependency+0x9d/0x130
Oct 28 11:59:18 hp-x360n kernel: [156262.539155] Code: 06 00 00 8b b6 c8 04 00
00 48 8d 8b b0 00 00 00 49 89 e8 48 c7 c7 f0 c5 d4 bd 48 89 04 24 c6 05 e6 77
62 01 01 e8 5c 25 fe ff <0f> 0b 48 8b 04 24 eb 10 4c 89 e7 e8 43 73 00 00 41 f6
44 24 25 08
Oct 28 11:59:18 hp-x360n kernel: [156262.539155] RSP: 0018:ffffc05580707918
EFLAGS: 00010086
Oct 28 11:59:18 hp-x360n kernel: [156262.539156] RAX: 0000000000000000 RBX:
ffff9da9cd010c00 RCX: 0000000000000000
Oct 28 11:59:18 hp-x360n kernel: [156262.539157] RDX: 0000000000000063 RSI:
ffffffffbe748dc3 RDI: ffffffffbe74692c
Oct 28 11:59:18 hp-x360n kernel: [156262.539158] RBP: ffffffffc0139000 R08:
ffffffffbe748d60 R09: 0000000000027a00
Oct 28 11:59:18 hp-x360n kernel: [156262.539159] R10: 345d0699392b2cbc R11:
0000000000004712 R12: ffff9da9cc0e2ac0
Oct 28 11:59:18 hp-x360n kernel: [156262.539160] R13: 0000000000000001 R14:
ffff9da9cee67b00 R15: ffff9da8423fa980
Oct 28 11:59:18 hp-x360n kernel: [156262.539161] FS:  0000000000000000(0000)
GS:ffff9da9cef40000(0000) knlGS:0000000000000000
Oct 28 11:59:18 hp-x360n kernel: [156262.539161] CS:  0010 DS: 0000 ES: 0000
CR0: 0000000080050033
Oct 28 11:59:18 hp-x360n kernel: [156262.539162] CR2: 000039df118ed208 CR3:
00000002d39ee004 CR4: 00000000003606e0
Oct 28 11:59:18 hp-x360n kernel: [156262.539163] Call Trace:
Oct 28 11:59:18 hp-x360n kernel: [156262.539166]  __flush_work+0x97/0x1d0
Oct 28 11:59:18 hp-x360n kernel: [156262.539168]  ? try_to_wake_up+0x38b/0x600
Oct 28 11:59:18 hp-x360n kernel: [156262.539170]  ? work_busy+0x90/0x90
Oct 28 11:59:18 hp-x360n kernel: [156262.539171] 
__cancel_work_timer+0x103/0x190
Oct 28 11:59:18 hp-x360n kernel: [156262.539173]  ? synchronize_irq+0x35/0xa0
Oct 28 11:59:18 hp-x360n kernel: [156262.539185] 
gen6_disable_rps_interrupts+0x77/0xa0 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539201]  gen6_rps_idle+0x1a/0xd0
[i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539218]  intel_gt_park+0x54/0x60
[i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539233] 
__intel_wakeref_put_last+0x14/0x40 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539249]  __engine_park+0x7a/0xc0
[i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539264] 
__intel_wakeref_put_last+0x14/0x40 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539282] 
i915_request_retire+0x164/0x350 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539300] 
ring_retire_requests+0x4c/0x60 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539334] 
i915_retire_requests+0x3d/0x80 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539351]  i915_gem_shrink+0x39e/0x550
[i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539354]  ?
__mutex_unlock_slowpath.isra.20+0xbc/0x120
Oct 28 11:59:18 hp-x360n kernel: [156262.539371] 
i915_gem_shrinker_scan+0x61/0x110 [i915]
Oct 28 11:59:18 hp-x360n kernel: [156262.539373]  do_shrink_slab+0x11f/0x2c0
Oct 28 11:59:18 hp-x360n kernel: [156262.539375]  shrink_slab+0xad/0x280
Oct 28 11:59:18 hp-x360n kernel: [156262.539377]  shrink_node+0xcc/0x3d0
Oct 28 11:59:18 hp-x360n kernel: [156262.539379]  balance_pgdat+0x2a1/0x510
Oct 28 11:59:18 hp-x360n kernel: [156262.539380]  kswapd+0x1d6/0x3e0
Oct 28 11:59:18 hp-x360n kernel: [156262.539382]  ? wait_woken+0x80/0x80
Oct 28 11:59:18 hp-x360n kernel: [156262.539383]  kthread+0x10c/0x130
Oct 28 11:59:18 hp-x360n kernel: [156262.539384]  ? balance_pgdat+0x510/0x510
Oct 28 11:59:18 hp-x360n kernel: [156262.539385]  ? kthread_park+0x80/0x80
Oct 28 11:59:18 hp-x360n kernel: [156262.539387]  ret_from_fork+0x1f/0x30
Oct 28 11:59:18 hp-x360n kernel: [156262.539389] ---[ end trace
bd1306cf8dc03243 ]---[/code]

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