Hi,
On 05.03.2016 16:24, Christian König wrote:
just an educated guess, but I think the problem is simply that kernel
3.14 doesn't yet contain the code so that radeon_fence_get() can safely
called with a NULL pointer.
So the backport of Nicolai's patch needs and extra check for the case
when the fence is NULL.
Oops indeed. Only the ref call should need the guard, the unref has
always had a NULL pointer test as far as I can see.
Lutz, could you please test whether the attached patch on top of 3.14.63
fixes the problem?
Thanks,
Nicolai
Regards,
Christian.
Am 05.03.2016 um 18:16 schrieb Lutz Euler:
Hi,
after upgrading from kernel 3.14.62 to 3.14.63, while surfing, the
screen suddenly got black and the mouse cursor froze. I had to reset
the machine and found an oops followed by repeated messages
"BUG: scheduling while atomic: Xorg/3757/0x00000002" in the logs.
I have copied the oops and the first of these messages below.
This was repeatable: After the reboot, when the browser restored its
tabs, the oops occurred again. I then rebooted into 3.14.62 and the
problem didn't occur again.
Just guessing: Of the commits regarding radeon between these two
kernel versions might the following be involved
Nicolai Hähnle (1):
drm/radeon: hold reference to fences in radeon_sa_bo_new
as it mentions fences and the stack trace starts with radeon_sa_bo_new?
Thanks and Regards,
Lutz
From lspci -v:
05:00.0 VGA compatible controller: ATI Technologies Inc NI Caicos [AMD
RADEON HD 6450] (prog-if 00 [VGA controller])
Subsystem: PC Partner Limited Device e164
Flags: bus master, fast devsel, latency 0, IRQ 53
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at fe9e0000 (64-bit, non-prefetchable) [size=128K]
I/O ports at e000 [size=256]
Expansion ROM at fe9c0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1
Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon
Kernel modules: radeon
X.Org version: 1.10.4
decodecode of the oops:
Mar 5 15:04:58 lutz kernel: [ 6995.216776] Code: c7 c6 d8 3e 36 a0 31
c0 45 31 e4 e8 7b 70 15 e1 eb b5 66 0f 1f 84 00 00 00 00 00 55 48 89
f8 ba 01 00 00 00 48 89 e5 48 83 ec 10 <f0> 0f c1 57 08 ff c2 ff ca 7e
02 c9 c3 80 3d 10 ae 10 00 01 74
All code
========
0: c7 c6 d8 3e 36 a0 mov $0xa0363ed8,%esi
6: 31 c0 xor %eax,%eax
8: 45 31 e4 xor %r12d,%r12d
b: e8 7b 70 15 e1 callq 0xffffffffe115708b
10: eb b5 jmp 0xffffffffffffffc7
12: 66 0f 1f 84 00 00 00 nopw 0x0(%rax,%rax,1)
19: 00 00
1b: 55 push %rbp
1c: 48 89 f8 mov %rdi,%rax
1f: ba 01 00 00 00 mov $0x1,%edx
24: 48 89 e5 mov %rsp,%rbp
27: 48 83 ec 10 sub $0x10,%rsp
2b:* f0 0f c1 57 08 lock xadd %edx,0x8(%rdi)
<-- trapping instruction
30: ff c2 inc %edx
32: ff ca dec %edx
34: 7e 02 jle 0x38
36: c9 leaveq
37: c3 retq
38: 80 3d 10 ae 10 00 01 cmpb $0x1,0x10ae10(%rip) #
0x10ae4f
3f: 74 .byte 0x74
Code starting with the faulting instruction
===========================================
0: f0 0f c1 57 08 lock xadd %edx,0x8(%rdi)
5: ff c2 inc %edx
7: ff ca dec %edx
9: 7e 02 jle 0xd
b: c9 leaveq
c: c3 retq
d: 80 3d 10 ae 10 00 01 cmpb $0x1,0x10ae10(%rip) #
0x10ae24
14: 74 .byte 0x74
Mar 5 15:04:58 lutz kernel: [ 6995.192330] BUG: unable to handle
kernel NULL pointer dereference at 0000000000000008
Mar 5 15:04:58 lutz kernel: [ 6995.192375] IP: [<ffffffffa02776c0>]
radeon_fence_ref+0x10/0x50 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.192441] PGD 22a86a067 PUD
22d8e8067 PMD 0
Mar 5 15:04:58 lutz kernel: [ 6995.192463] Oops: 0002 [#1] PREEMPT SMP
Mar 5 15:04:58 lutz kernel: [ 6995.192484] Modules linked in:
binfmt_misc parport_pc ppdev snd_hda_codec_hdmi snd_opl3_synth
snd_seq_midi_emul snd_hda_intel snd_hda_codec snd_es1938 gameport
snd_pcm_oss snd_mixer_oss snd_seq_dummy snd_pcm snd_seq_oss
snd_opl3_lib snd_hwdep snd_mpu401_uart snd_seq_midi snd_rawmidi
snd_seq_midi_event snd_seq psmouse fbcon tileblit edac_core font
serio_raw i2c_piix4 bitblit softcursor radeon snd_seq_device snd_timer
hwmon_vid ttm drm_kms_helper asus_atk0110 drm i2c_algo_bit snd
soundcore lp parport usbhid btrfs raid6_pq zlib_deflate xor r8169 mii
xhci_hcd libcrc32c
Mar 5 15:04:58 lutz kernel: [ 6995.192741] CPU: 5 PID: 3757 Comm:
Xorg Not tainted 3.14.63 #1
Mar 5 15:04:58 lutz kernel: [ 6995.192765] Hardware name: System
manufacturer System Product Name/M4A87TD/USB3, BIOS 1202 02/17/2011
Mar 5 15:04:58 lutz kernel: [ 6995.192803] task: ffff88022c1d5f80 ti:
ffff8800c42a6000 task.ti: ffff8800c42a6000
Mar 5 15:04:58 lutz kernel: [ 6995.192833] RIP:
0010:[<ffffffffa02776c0>] [<ffffffffa02776c0>]
radeon_fence_ref+0x10/0x50 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.192881] RSP:
0018:ffff8800c42a7a68 EFLAGS: 00010282
Mar 5 15:04:58 lutz kernel: [ 6995.192903] RAX: 0000000000000000 RBX:
ffff8800c5d61328 RCX: 0000000000000000
Mar 5 15:04:58 lutz kernel: [ 6995.192931] RDX: 0000000000000001 RSI:
0000000000000000 RDI: 0000000000000000
Mar 5 15:04:58 lutz kernel: [ 6995.192960] RBP: ffff8800c42a7a78 R08:
ffff8800c5d60000 R09: 0000000000000000
Mar 5 15:04:58 lutz kernel: [ 6995.192988] R10: 0000000000000000 R11:
0000000000000000 R12: 0000000000000100
Mar 5 15:04:58 lutz kernel: [ 6995.193016] R13: ffff8800c5d613b0 R14:
ffff8800c42a7ae8 R15: ffff8800c42a7b08
Mar 5 15:04:58 lutz kernel: [ 6995.193045] FS:
00007f7ebe91d8a0(0000) GS:ffff880237d40000(0000) knlGS:0000000000000000
Mar 5 15:04:58 lutz kernel: [ 6995.193076] CS: 0010 DS: 0000 ES:
0000 CR0: 0000000080050033
Mar 5 15:04:58 lutz kernel: [ 6995.193100] CR2: 0000000000000008 CR3:
000000022de3e000 CR4: 00000000000007e0
Mar 5 15:04:58 lutz kernel: [ 6995.193128] Stack:
Mar 5 15:04:58 lutz kernel: [ 6995.193137] ffff880159dcef00
ffff8800c5d61328 ffff8800c42a7b88 ffffffffa02d9f22
Mar 5 15:04:58 lutz kernel: [ 6995.193170] 01ff8800c42a7a98
ffff8800c5d60000 ffff8800c42a7b08 ffff8800c42a7c88
Mar 5 15:04:58 lutz kernel: [ 6995.193203] 0000f00455ee5200
ffff8800c5d613b0 00000100c42a7b08 0006e97800200000
Mar 5 15:04:58 lutz kernel: [ 6995.193237] Call Trace:
Mar 5 15:04:58 lutz kernel: [ 6995.194709] [<ffffffffa02d9f22>]
radeon_sa_bo_new+0x302/0x590 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.196175] [<ffffffff811551e6>] ?
__kmalloc+0x66/0x1d0
Mar 5 15:04:58 lutz kernel: [ 6995.197659] [<ffffffffa028f849>] ?
copy_from_user+0x9/0x10 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.199160] [<ffffffffa028dcb3>]
radeon_ib_get+0x43/0xe0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.200655] [<ffffffffa0290111>]
radeon_cs_ioctl+0x201/0xac0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.202135] [<ffffffff812ffe52>] ?
idr_mark_full+0x52/0x70
Mar 5 15:04:58 lutz kernel: [ 6995.203620] [<ffffffffa01b6b31>]
drm_ioctl+0x401/0x580 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.205094] [<ffffffffa028ff10>] ?
radeon_cs_parser_init+0x470/0x470 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.206564] [<ffffffff816572dc>] ?
__do_page_fault+0x1cc/0x560
Mar 5 15:04:58 lutz kernel: [ 6995.208033] [<ffffffffa025e349>]
radeon_drm_ioctl+0x9/0x10 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.209510] [<ffffffff8116fe21>]
do_vfs_ioctl+0x81/0x4d0
Mar 5 15:04:58 lutz kernel: [ 6995.210975] [<ffffffff81137f29>] ?
SyS_mmap_pgoff+0xd9/0x210
Mar 5 15:04:58 lutz kernel: [ 6995.212432] [<ffffffff81170301>]
SyS_ioctl+0x91/0xa0
Mar 5 15:04:58 lutz kernel: [ 6995.213874] [<ffffffff8165767c>] ?
do_page_fault+0xc/0x10
Mar 5 15:04:58 lutz kernel: [ 6995.215323] [<ffffffff8165b542>]
system_call_fastpath+0x16/0x1b
Mar 5 15:04:58 lutz kernel: [ 6995.216776] Code: c7 c6 d8 3e 36 a0 31
c0 45 31 e4 e8 7b 70 15 e1 eb b5 66 0f 1f 84 00 00 00 00 00 55 48 89
f8 ba 01 00 00 00 48 89 e5 48 83 ec 10 <f0> 0f c1 57 08 ff c2 ff ca 7e
02 c9 c3 80 3d 10 ae 10 00 01 74
Mar 5 15:04:58 lutz kernel: [ 6995.218402] RIP [<ffffffffa02776c0>]
radeon_fence_ref+0x10/0x50 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.219987] RSP <ffff8800c42a7a68>
Mar 5 15:04:58 lutz kernel: [ 6995.221568] CR2: 0000000000000008
Mar 5 15:04:58 lutz kernel: [ 6995.234168] ---[ end trace
37c0545f39a2b3e5 ]---
Mar 5 15:04:58 lutz kernel: [ 6995.234170] note: Xorg[3757] exited
with preempt_count 1
Mar 5 15:04:58 lutz kernel: [ 6995.239926] BUG: scheduling while
atomic: Xorg/3757/0x00000002
Mar 5 15:04:58 lutz kernel: [ 6995.239931] Modules linked in:
binfmt_misc parport_pc ppdev snd_hda_codec_hdmi snd_opl3_synth
snd_seq_midi_emul snd_hda_intel snd_hda_c
odec snd_es1938 gameport snd_pcm_oss snd_mixer_oss snd_seq_dummy
snd_pcm snd_seq_oss snd_opl3_lib snd_hwdep snd_mpu401_uart
snd_seq_midi snd_rawmidi snd_seq_midi_event
snd_seq psmouse fbcon tileblit edac_core font serio_raw i2c_piix4
bitblit softcursor radeon snd_seq_device snd_timer hwmon_vid ttm
drm_kms_helper asus_atk0110 drm i2c
_algo_bit snd soundcore lp parport usbhid btrfs raid6_pq zlib_deflate
xor r8169 mii xhci_hcd libcrc32c
Mar 5 15:04:58 lutz kernel: [ 6995.239960] CPU: 5 PID: 3757 Comm:
Xorg Tainted: G D 3.14.63 #1
Mar 5 15:04:58 lutz kernel: [ 6995.239961] Hardware name: System
manufacturer System Product Name/M4A87TD/USB3, BIOS 1202 02/17/2011
Mar 5 15:04:58 lutz kernel: [ 6995.239963] 0000000000000000
ffff8800c42a7078 ffffffff8164f89c ffff880237d518c0
Mar 5 15:04:58 lutz kernel: [ 6995.239965] 0000000000000005
ffff8800c42a7088 ffffffff81075d27 ffff8800c42a70f8
Mar 5 15:04:58 lutz kernel: [ 6995.239967] ffffffff81650680
ffff8800c42a7184 ffff88022c1d5f80 ffff8800c42a6000
Mar 5 15:04:58 lutz kernel: [ 6995.239969] Call Trace:
Mar 5 15:04:58 lutz kernel: [ 6995.239976] [<ffffffff8164f89c>]
dump_stack+0x4f/0x6b
Mar 5 15:04:58 lutz kernel: [ 6995.239980] [<ffffffff81075d27>]
__schedule_bug+0x47/0x60
Mar 5 15:04:58 lutz kernel: [ 6995.239982] [<ffffffff81650680>]
__schedule+0x600/0x810
Mar 5 15:04:58 lutz kernel: [ 6995.239984] [<ffffffff81650984>]
schedule+0x24/0x70
Mar 5 15:04:58 lutz kernel: [ 6995.239986] [<ffffffff8164fa11>]
schedule_timeout+0x151/0x320
Mar 5 15:04:58 lutz kernel: [ 6995.239989] [<ffffffff81056b60>] ?
call_timer_fn+0x1a0/0x1a0
Mar 5 15:04:58 lutz kernel: [ 6995.240028] [<ffffffffa027713a>]
radeon_fence_wait_seq+0x3ca/0x530 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240043] [<ffffffffa02c1740>] ?
evergreen_program_watermarks+0x150/0x670 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240046] [<ffffffff8108a210>] ?
bit_waitqueue+0xd0/0xd0
Mar 5 15:04:58 lutz kernel: [ 6995.240062] [<ffffffffa02c004b>] ?
evergreen_line_buffer_adjust.clone.5+0xcb/0x1a0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240073] [<ffffffffa0277680>]
radeon_fence_wait_empty_locked+0xb0/0xe0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240088] [<ffffffffa02bb83d>]
radeon_pm_compute_clocks+0x59d/0x840 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240100] [<ffffffffa026a69f>]
atombios_crtc_dpms+0x6f/0x100 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240111] [<ffffffffa026bc08>]
atombios_crtc_disable+0x28/0x2f0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240126] [<ffffffffa02d8844>] ?
radeon_atom_encoder_dpms+0xf4/0x230 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240132] [<ffffffffa021b305>]
drm_helper_disable_unused_functions+0x105/0x160 [drm_kms_helper]
Mar 5 15:04:58 lutz kernel: [ 6995.240135] [<ffffffffa021c610>]
drm_crtc_helper_set_config+0x130/0x970 [drm_kms_helper]
Mar 5 15:04:58 lutz kernel: [ 6995.240138] [<ffffffff81155962>] ?
__slab_free+0x302/0x480
Mar 5 15:04:58 lutz kernel: [ 6995.240151] [<ffffffffa0285061>]
radeon_crtc_set_config+0x31/0xb0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240172] [<ffffffffa01c16ac>]
drm_mode_set_config_internal+0x5c/0xe0 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.240180] [<ffffffffa01c30bd>]
drm_framebuffer_remove+0x10d/0x160 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.240188] [<ffffffffa01c6605>]
drm_fb_release+0xa5/0xd0 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.240195] [<ffffffffa01b7e18>]
drm_release+0x548/0x5c0 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.240198] [<ffffffff8115f5a4>]
__fput+0xa4/0x220
Mar 5 15:04:58 lutz kernel: [ 6995.240199] [<ffffffff8115f769>]
____fput+0x9/0x10
Mar 5 15:04:58 lutz kernel: [ 6995.240202] [<ffffffff8106a80c>]
task_work_run+0xac/0xd0
Mar 5 15:04:58 lutz kernel: [ 6995.240205] [<ffffffff8104dc30>]
do_exit+0x2c0/0xac0
Mar 5 15:04:58 lutz kernel: [ 6995.240207] [<ffffffff8164f77b>] ?
printk+0x48/0x4a
Mar 5 15:04:58 lutz kernel: [ 6995.240209] [<ffffffff8109bc29>] ?
kmsg_dump+0xb9/0xd0
Mar 5 15:04:58 lutz kernel: [ 6995.240211] [<ffffffff8165553a>]
oops_end+0x9a/0xe0
Mar 5 15:04:58 lutz kernel: [ 6995.240214] [<ffffffff8103ee32>]
no_context+0x132/0x2e0
Mar 5 15:04:58 lutz kernel: [ 6995.240216] [<ffffffff8103f0f5>]
__bad_area_nosemaphore+0x115/0x210
Mar 5 15:04:58 lutz kernel: [ 6995.240218] [<ffffffff811136d1>] ?
__alloc_pages_nodemask+0x141/0x910
Mar 5 15:04:58 lutz kernel: [ 6995.240220] [<ffffffff8103f1fe>]
bad_area_nosemaphore+0xe/0x10
Mar 5 15:04:58 lutz kernel: [ 6995.240222] [<ffffffff81657442>]
__do_page_fault+0x332/0x560
Mar 5 15:04:58 lutz kernel: [ 6995.240230] [<ffffffffa022b8bb>] ?
ttm_mem_global_alloc_zone.clone.1+0x12b/0x150 [ttm]
Mar 5 15:04:58 lutz kernel: [ 6995.240233] [<ffffffffa022bc12>] ?
ttm_mem_global_alloc_page+0x42/0x50 [ttm]
Mar 5 15:04:58 lutz kernel: [ 6995.240237] [<ffffffff8114dd3e>] ?
alloc_pages_current+0xae/0x170
Mar 5 15:04:58 lutz kernel: [ 6995.240238] [<ffffffff8165767c>]
do_page_fault+0xc/0x10
Mar 5 15:04:58 lutz kernel: [ 6995.240240] [<ffffffff816549d2>]
page_fault+0x22/0x30
Mar 5 15:04:58 lutz kernel: [ 6995.240252] [<ffffffffa02776c0>] ?
radeon_fence_ref+0x10/0x50 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240268] [<ffffffffa02d9f22>]
radeon_sa_bo_new+0x302/0x590 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240270] [<ffffffff811551e6>] ?
__kmalloc+0x66/0x1d0
Mar 5 15:04:58 lutz kernel: [ 6995.240283] [<ffffffffa028f849>] ?
copy_from_user+0x9/0x10 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240296] [<ffffffffa028dcb3>]
radeon_ib_get+0x43/0xe0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240309] [<ffffffffa0290111>]
radeon_cs_ioctl+0x201/0xac0 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240312] [<ffffffff812ffe52>] ?
idr_mark_full+0x52/0x70
Mar 5 15:04:58 lutz kernel: [ 6995.240320] [<ffffffffa01b6b31>]
drm_ioctl+0x401/0x580 [drm]
Mar 5 15:04:58 lutz kernel: [ 6995.240333] [<ffffffffa028ff10>] ?
radeon_cs_parser_init+0x470/0x470 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240335] [<ffffffff816572dc>] ?
__do_page_fault+0x1cc/0x560
Mar 5 15:04:58 lutz kernel: [ 6995.240346] [<ffffffffa025e349>]
radeon_drm_ioctl+0x9/0x10 [radeon]
Mar 5 15:04:58 lutz kernel: [ 6995.240348] [<ffffffff8116fe21>]
do_vfs_ioctl+0x81/0x4d0
Mar 5 15:04:58 lutz kernel: [ 6995.240351] [<ffffffff81137f29>] ?
SyS_mmap_pgoff+0xd9/0x210
Mar 5 15:04:58 lutz kernel: [ 6995.240353] [<ffffffff81170301>]
SyS_ioctl+0x91/0xa0
Mar 5 15:04:58 lutz kernel: [ 6995.240355] [<ffffffff8165767c>] ?
do_page_fault+0xc/0x10
Mar 5 15:04:58 lutz kernel: [ 6995.240357] [<ffffffff8165b542>]
system_call_fastpath+0x16/0x1b
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>From 85d028178d9772f2a07e4ed156820d95c4e0ad18 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nicolai=20H=C3=A4hnle?= <nicolai.haehnle@xxxxxxx>
Date: Mon, 7 Mar 2016 23:41:52 -0300
Subject: [PATCH] drm/radeon: guard call to radeon_fence_ref against NULL
pointers
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Candidate fix for a kernel oops that was introduced by the backport of
commit 954605ca3 "drm/radeon: hold reference to fences in radeon_sa_bo_new"
to kernels where radeon does not use the common fence implementation for
fences.
Reported-by: Lutz Euler <lutz.euler@xxxxxxxxxx>
Signed-off-by: Nicolai Hähnle <nicolai.haehnle@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_sa.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_sa.c b/drivers/gpu/drm/radeon/radeon_sa.c
index 197b157..7d11901 100644
--- a/drivers/gpu/drm/radeon/radeon_sa.c
+++ b/drivers/gpu/drm/radeon/radeon_sa.c
@@ -349,8 +349,10 @@ int radeon_sa_bo_new(struct radeon_device *rdev,
/* see if we can skip over some allocations */
} while (radeon_sa_bo_next_hole(sa_manager, fences, tries));
- for (i = 0; i < RADEON_NUM_RINGS; ++i)
- radeon_fence_ref(fences[i]);
+ for (i = 0; i < RADEON_NUM_RINGS; ++i) {
+ if (fences[i])
+ radeon_fence_ref(fences[i]);
+ }
spin_unlock(&sa_manager->wq.lock);
r = radeon_fence_wait_any(rdev, fences, false);
--
2.5.0
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