From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
stable@vger.kernel.org, Sam Jansen <sam.jansen@starleaf.com>,
Chris Wilson <chris@chris-wilson.co.uk>,
Daniel Vetter <daniel.vetter@ffwll.ch>,
Jani Nikula <jani.nikula@intel.com>
Subject: [PATCH 3.15 045/122] drm/i915: Hold the table lock whilst walking the files idr and counting the objects in debugfs
Date: Mon, 7 Jul 2014 16:56:47 -0700 [thread overview]
Message-ID: <20140707235735.637107933@linuxfoundation.org> (raw)
In-Reply-To: <20140707235734.234226883@linuxfoundation.org>
3.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Chris Wilson <chris@chris-wilson.co.uk>
commit 5b5ffff0d25060ab0e21fa0f6cd16428e87bf1ea upstream.
Fixes an issue whereby we may race with the table updates (before the
core takes the struct_mutex) and so risk dereferencing a stale pointer in
the iterator for /debugfs/.../i915_gem_objects. For example,
[ 1524.757545] BUG: unable to handle kernel paging request at f53af748
[ 1524.757572] IP: [<c1406982>] per_file_stats+0x12/0x100
[ 1524.757599] *pdpt = 0000000001b13001 *pde = 00000000379fb067 *pte = 80000000353af060
[ 1524.757621] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
[ 1524.757637] Modules linked in: ctr ccm arc4 ath9k ath9k_common ath9k_hw ath snd_hda_codec_conexant mac80211 snd_hda_codec_generic snd_hda_intel snd_hda_controller snd_hda_codec bnep snd_hwdep rfcomm snd_pcm gpio_ich dell_wmi sparse_keymap snd_seq_midi hid_multitouch uvcvideo snd_seq_midi_event dell_laptop snd_rawmidi dcdbas snd_seq videobuf2_vmalloc videobuf2_memops videobuf2_core usbhid videodev snd_seq_device coretemp snd_timer hid joydev kvm_intel cfg80211 ath3k kvm btusb bluetooth serio_raw snd microcode soundcore lpc_ich wmi mac_hid parport_pc ppdev lp parport psmouse ahci libahci
[ 1524.757825] CPU: 3 PID: 1911 Comm: intel-gpu-overl Tainted: G W OE 3.15.0-rc3+ #96
[ 1524.757840] Hardware name: Dell Inc. Inspiron 1090/Inspiron 1090, BIOS A06 08/23/2011
[ 1524.757855] task: f52f36c0 ti: f4cbc000 task.ti: f4cbc000
[ 1524.757869] EIP: 0060:[<c1406982>] EFLAGS: 00210202 CPU: 3
[ 1524.757884] EIP is at per_file_stats+0x12/0x100
[ 1524.757896] EAX: 0000002d EBX: 00000000 ECX: f4cbdefc EDX: f53af700
[ 1524.757909] ESI: c1406970 EDI: f53af700 EBP: f4cbde6c ESP: f4cbde5c
[ 1524.757922] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 1524.757934] CR0: 80050033 CR2: f53af748 CR3: 356af000 CR4: 000007f0
[ 1524.757945] Stack:
[ 1524.757957] f4cbdefc 00000000 c1406970 f53af700 f4cbdea8 c12e5f15 f4cbdefc c1406970
[ 1524.757993] 0000ffff f4cbde90 0000002d f5dc5cd0 e4e80438 c1181d59 f4cbded8 f4d89900
[ 1524.758027] f5631b40 e5131074 c1903f37 f4cbdf28 c14068e6 f52648a0 c1927748 c1903f37
[ 1524.758062] Call Trace:
[ 1524.758084] [<c1406970>] ? i915_gem_object_info+0x510/0x510
[ 1524.758106] [<c12e5f15>] idr_for_each+0xa5/0x100
[ 1524.758126] [<c1406970>] ? i915_gem_object_info+0x510/0x510
[ 1524.758148] [<c1181d59>] ? seq_vprintf+0x29/0x50
[ 1524.758168] [<c14068e6>] i915_gem_object_info+0x486/0x510
[ 1524.758189] [<c11823a6>] seq_read+0xd6/0x380
[ 1524.758208] [<c116d11d>] ? final_putname+0x1d/0x40
[ 1524.758227] [<c11822d0>] ? seq_hlist_next_percpu+0x90/0x90
[ 1524.758246] [<c1163e52>] vfs_read+0x82/0x150
[ 1524.758265] [<c11645d6>] SyS_read+0x46/0x90
[ 1524.758285] [<c16b8d8c>] sysenter_do_call+0x12/0x22
[ 1524.758298] Code: f5 8f 2a 00 83 c4 6c 31 c0 5b 5e 5f 5d c3 8d 74 26 00 8d bc 27 00 00 00 00 55 89 e5 57 56 53 83 ec 04 3e 8d 74 26 00 83 41 04 01 <8b> 42 48 01 41 08 8b 42 4c 89 d7 85 c0 75 07 8b 42 60 85 c0 74
[ 1524.758461] EIP: [<c1406982>] per_file_stats+0x12/0x100 SS:ESP 0068:f4cbde5c
[ 1524.758485] CR2: 00000000f53af748
Reported-by: Sam Jansen <sam.jansen@starleaf.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Sam Jansen <sam.jansen@starleaf.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/i915/i915_debugfs.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -446,7 +446,9 @@ static int i915_gem_object_info(struct s
memset(&stats, 0, sizeof(stats));
stats.file_priv = file->driver_priv;
+ spin_lock(&file->table_lock);
idr_for_each(&file->object_idr, per_file_stats, &stats);
+ spin_unlock(&file->table_lock);
/*
* Although we have a valid reference on file->pid, that does
* not guarantee that the task_struct who called get_pid() is
next prev parent reply other threads:[~2014-07-07 23:56 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-07 23:56 [PATCH 3.15 000/122] 3.15.5-stable review Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 001/122] SCSI: use the scsi data buffer length to extract transfer size Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 003/122] ibmvscsi: Abort init sequence during error recovery Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 004/122] ibmvscsi: Add memory barriers for send / receive Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 005/122] virtio-scsi: avoid cancelling uninitialized work items Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 006/122] scsi_error: fix invalid setting of host byte Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 007/122] virtio-scsi: fix various bad behavior on aborted requests Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 008/122] xhci: Use correct SLOT ID when handling a reset device command Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 009/122] xhci: correct burst count field for isoc transfers on 1.0 xhci hosts Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 010/122] xhci: Fix runtime suspended xhci from blocking system suspend Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 011/122] USB: option: add device ID for SpeedUp SU9800 usb 3g modem Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 013/122] usb: musb: ux500: dont propagate the OF node Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 014/122] usb: musb: Ensure that cppi41 timer gets armed on premature DMA TX irq Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 015/122] usb: musb: Fix panic upon musb_am335x module removal Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 016/122] usb: chipidea: udc: delete td from reqs td list at ep_dequeue Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 017/122] USB: ftdi_sio: fix null deref at port probe Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 020/122] rt2x00: disable TKIP on USB Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 021/122] rt2x00: fix rfkill regression on rt2500pci Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 022/122] mtd: eLBC NAND: fix subpage write support Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 023/122] mtd: nand: omap: fix BCHx ecc.correct to return detected bit-flips in erased-page Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 024/122] mtd: pxa3xx_nand: make the driver work on big-endian systems Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 025/122] vgaswitcheroo: switch the mux to the igp on power down when runpm is enabled Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 026/122] drm/nouveau/kms/nv04-nv40: fix pageflip events via special case Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 027/122] drm/nouveau/disp/nv04-nv40: abort scanoutpos query on vga analog Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 028/122] drm/nouveau/kms: reference vblank for crtc during pageflip Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 029/122] drm/radeon: only apply hdmi bpc pll flags when encoder mode is hdmi Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 030/122] drm/radeon: fix typo in radeon_connector_is_dp12_capable() Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 031/122] drm/radeon/dp: fix lane/clock setup for dp 1.2 capable devices Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 032/122] drm/radeon/atom: fix dithering on certain panels Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 033/122] drm/radeon: add missing vce init case for hawaii Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 034/122] drm/radeon/dpm: fix typo in vddci setup for eg/btc Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 036/122] drm/radeon/cik: fix typo in EOP packet Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 037/122] drm/nv50-/mc: fix kms pageflip events by reordering irq handling order Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 038/122] drm/gk208/gr: add missing registers to grctx init Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 039/122] drm/i915/bdw: Only use 2g GGTT for 32b platforms Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 040/122] drm/i915: Reorder semaphore deadlock check Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 041/122] drm/i915: Disable FBC by default also on Haswell and later Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 043/122] drm/i915: set backlight duty cycle after backlight enable for gen4 Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 044/122] drm/i915, HD-audio: Dont continue probing when nomodeset is given Greg Kroah-Hartman
2014-07-07 23:56 ` Greg Kroah-Hartman [this message]
2014-07-07 23:56 ` [PATCH 3.15 046/122] drm/i915: default to having backlight if VBT not available Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 047/122] drm/i95: Initialize active ring->pid to -1 Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 048/122] drm: fix NULL pointer access by wrong ioctl Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 049/122] drm/i915: provide interface for audio driver to query cdclk Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 050/122] ALSA: hda - restore BCLK M/N value as per CDCLK for HSW/BDW display HDA controller Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 051/122] drm/vmwgfx: Fix incorrect write to read-only register v2: Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 053/122] Bluetooth: Fix incorrectly overriding conn->src_type Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 054/122] Bluetooth: Fix SSP acceptor just-works confirmation without MITM Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 055/122] Bluetooth: Fix check for connection encryption Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 056/122] Bluetooth: Fix indicating discovery state when canceling inquiry Greg Kroah-Hartman
2014-07-07 23:56 ` [PATCH 3.15 057/122] Bluetooth: Refactor discovery stopping into its own function Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 058/122] Bluetooth: Reuse hci_stop_discovery function when cleaning up HCI state Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 059/122] Bluetooth: Fix setting correct authentication information for SMP STK Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 060/122] Bluetooth: Fix deadlock in l2cap_conn_del() Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 061/122] Bluetooth: Fix locking of hdev when calling into SMP code Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 062/122] Bluetooth: Allow change security level on ATT_CID in slave role Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 063/122] dm era: check for a non-NULL metadata object before closing it Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 064/122] dm thin: update discard_granularity to reflect the thin-pool blocksize Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 065/122] rbd: use reference counts for image requests Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 066/122] rbd: handle parent_overlap on writes correctly Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 067/122] hwmon: (ina2xx) Cast to s16 on shunt and current regs Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 068/122] intel_pstate: Correct rounding in busy calculation Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 069/122] twl4030-madc: Request processed values in twl4030_get_madc_conversion Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 071/122] mac80211: dont check netdev state for debugfs read/write Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 073/122] iwlwifi: pcie: try to get ownership several times Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 074/122] mm: nommu: per-thread vma cache fix Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 075/122] hugetlb: fix copy_hugetlb_page_range() to handle migration/hwpoisoned entry Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 076/122] mm, pcp: allow restoring percpu_pagelist_fraction default Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 077/122] ia64: arch/ia64/include/uapi/asm/fcntl.h needs personality.h Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 078/122] ARM: mvebu: Fix the improper use of the compatible string armada38x using a wildcard Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 079/122] arm64: mm: Make icache synchronisation logic huge page aware Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 080/122] ARM: OMAP2+: Fix parser-bug in platform muxing code Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 082/122] net: allwinner: emac: Add missing free_irq Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 085/122] CIFS: fix mount failure with broken pathnames when smb3 mount with mapchars option Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 086/122] regulator: tps65218: Add the missing of_node assignment in probe Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 087/122] regulator: tps65218: Correct the the config register for LDO1 Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 088/122] iommu/vt-d: fix bug in handling multiple RMRRs for the same PCI device Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 089/122] blkcg: fix use-after-free in __blkg_release_rcu() by making blkcg_gq refcnt an atomic_t Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 090/122] ext4: Fix buffer double free in ext4_alloc_branch() Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 091/122] ext4: Fix hole punching for files with indirect blocks Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 093/122] zram: revalidate disk after capacity change Greg Kroah-Hartman
2014-07-08 10:56 ` Sergey Senozhatsky
2014-07-08 15:02 ` Greg Kroah-Hartman
2014-07-09 5:39 ` Minchan Kim
2014-07-07 23:57 ` [PATCH 3.15 094/122] KVM: x86: Increase the number of fixed MTRR regs to 10 Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 095/122] KVM: x86: preserve the high 32-bits of the PAT register Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 096/122] kvm: fix wrong address when writing Hyper-V tsc page Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 097/122] iio: of_iio_channel_get_by_name() returns non-null pointers for error legs Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 098/122] staging: iio/ad7291: fix error code in ad7291_probe() Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 099/122] nfsd: fix rare symlink decoding bug Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 100/122] tools: ffs-test: fix header values endianess Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 101/122] staging: tidspbridge: fix an erroneous removal of parentheses Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 102/122] tracing: Remove ftrace_stop/start() from reading the trace file Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 103/122] tracing/uprobes: Revert "Support mix of ftrace and perf" Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 104/122] tracing/uprobes: Fix the usage of uprobe_buffer_enable() in probe_event_enable() Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 105/122] btrfs: only unlock block in verify_parent_transid if we locked it Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 106/122] md: flush writes before starting a recovery Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 107/122] irqchip: spear_shirq: Fix interrupt offset Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 108/122] ARC: Fix build breakage for !CONFIG_ARC_DW2_UNWIND Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 109/122] mlx4_core: Fix incorrect FLAGS1 bitmap test in mlx4_QUERY_FUNC_CAP Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 110/122] net/mlx4_core: Keep only one driver entry release mlx4_priv Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 111/122] clk: qcom: Fix clk_rcg2_is_enabled() check Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 112/122] clk: qcom: Fix mmcc-8974s PLL configurations Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 113/122] serial: Fix IGNBRK handling Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 114/122] tty: Correct INPCK handling Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 115/122] netfilter: ctnetlink: fix dumping of dying/unconfirmed conntracks Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 116/122] netfilter: nf_nat: fix oops on netns removal Greg Kroah-Hartman
2014-07-07 23:57 ` [PATCH 3.15 117/122] netfilter: ctnetlink: fix refcnt leak in dying/unconfirmed list dumper Greg Kroah-Hartman
2014-07-07 23:58 ` [PATCH 3.15 118/122] mmc: rtsx: add R1-no-CRC mmc command type handle Greg Kroah-Hartman
2014-07-07 23:58 ` [PATCH 3.15 119/122] drm/i915: fix display power sw state reporting Greg Kroah-Hartman
2014-07-07 23:58 ` [PATCH 3.15 120/122] arch/unicore32/mm/alignment.c: include "asm/pgtable.h" to avoid compiling error Greg Kroah-Hartman
2014-07-07 23:58 ` [PATCH 3.15 121/122] drivers/video/fbdev/fb-puv3.c: Add header files for function unifb_mmap Greg Kroah-Hartman
2014-07-07 23:58 ` [PATCH 3.15 122/122] mm/numa: Remove BUG_ON() in __handle_mm_fault() Greg Kroah-Hartman
2014-07-08 13:26 ` [PATCH 3.15 000/122] 3.15.5-stable review Guenter Roeck
2014-07-08 16:50 ` Satoru Takeuchi
2014-07-08 22:16 ` Greg Kroah-Hartman
2014-07-12 6:03 ` Guenter Roeck
2014-07-08 19:30 ` Shuah Khan
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