* [syzbot] BUG: unable to handle kernel paging request in drm_fb_helper_damage_work (2)
@ 2021-05-31 7:13 syzbot
2021-05-31 9:28 ` Borislav Petkov
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2021-05-31 7:13 UTC (permalink / raw)
To: bp, hpa, linux-kernel, mingo, syzkaller-bugs, tglx, x86
Hello,
syzbot found the following issue on:
HEAD commit: 7ac3a1c1 Merge tag 'mtd/fixes-for-5.13-rc4' of git://git.k..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1619b4b5d00000
kernel config: https://syzkaller.appspot.com/x/.config?x=266cda122a0b56c
dashboard link: https://syzkaller.appspot.com/bug?extid=545dc60af42828d1e70b
userspace arch: i386
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+545dc60af42828d1e70b@syzkaller.appspotmail.com
BUG: unable to handle page fault for address: ffffc9000dc68008
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
PGD 11000067 P4D 11000067 PUD 111b3067 PMD 1ba2c067 PTE 0
Oops: 0002 [#1] PREEMPT SMP KASAN
CPU: 2 PID: 16890 Comm: kworker/2:36 Not tainted 5.13.0-rc3-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Workqueue: events drm_fb_helper_damage_work
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 8c fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 c4 c2 8c fd 4d 85 ed 75 2e e8 9a ba 8c fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc9000e73fbc8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000dc68008 RCX: 00000000000000fe
RDX: ffff888015340000 RSI: ffffc9000bdd9008 RDI: ffffc9000dc68008
RBP: 00000000000003f8 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff83e81e1c R11: 0000000000000000 R12: ffffc9000bdd9008
R13: 0000000000000000 R14: ffffc9000bdd9008 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000dc68008 CR3: 000000006c062000 CR4: 0000000000152ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
dma_buf_map_memcpy_to include/linux/dma-buf-map.h:245 [inline]
drm_fb_helper_damage_blit_real drivers/gpu/drm/drm_fb_helper.c:388 [inline]
drm_fb_helper_damage_blit drivers/gpu/drm/drm_fb_helper.c:419 [inline]
drm_fb_helper_damage_work+0x733/0xac0 drivers/gpu/drm/drm_fb_helper.c:450
process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
worker_thread+0x64c/0x1120 kernel/workqueue.c:2422
kthread+0x3b1/0x4a0 kernel/kthread.c:313
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Modules linked in:
CR2: ffffc9000dc68008
---[ end trace 7f8625a9b15be223 ]---
RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
Code: 8c fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 c4 c2 8c fd 4d 85 ed 75 2e e8 9a ba 8c fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
RSP: 0018:ffffc9000e73fbc8 EFLAGS: 00010202
RAX: 0000000000000000 RBX: ffffc9000dc68008 RCX: 00000000000000fe
RDX: ffff888015340000 RSI: ffffc9000bdd9008 RDI: ffffc9000dc68008
RBP: 00000000000003f8 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff83e81e1c R11: 0000000000000000 R12: ffffc9000bdd9008
R13: 0000000000000000 R14: ffffc9000bdd9008 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc9000dc68008 CR3: 000000006c062000 CR4: 0000000000152ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [syzbot] BUG: unable to handle kernel paging request in drm_fb_helper_damage_work (2)
2021-05-31 7:13 [syzbot] BUG: unable to handle kernel paging request in drm_fb_helper_damage_work (2) syzbot
@ 2021-05-31 9:28 ` Borislav Petkov
0 siblings, 0 replies; 2+ messages in thread
From: Borislav Petkov @ 2021-05-31 9:28 UTC (permalink / raw)
To: syzbot, dri-devel; +Cc: hpa, linux-kernel, mingo, syzkaller-bugs, tglx, x86
Looks DRM to me. CCed...
On Mon, May 31, 2021 at 12:13:22AM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 7ac3a1c1 Merge tag 'mtd/fixes-for-5.13-rc4' of git://git.k..
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=1619b4b5d00000
> kernel config: https://syzkaller.appspot.com/x/.config?x=266cda122a0b56c
> dashboard link: https://syzkaller.appspot.com/bug?extid=545dc60af42828d1e70b
> userspace arch: i386
>
> Unfortunately, I don't have any reproducer for this issue yet.
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+545dc60af42828d1e70b@syzkaller.appspotmail.com
>
> BUG: unable to handle page fault for address: ffffc9000dc68008
> #PF: supervisor write access in kernel mode
> #PF: error_code(0x0002) - not-present page
> PGD 11000067 P4D 11000067 PUD 111b3067 PMD 1ba2c067 PTE 0
> Oops: 0002 [#1] PREEMPT SMP KASAN
> CPU: 2 PID: 16890 Comm: kworker/2:36 Not tainted 5.13.0-rc3-syzkaller #0
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
> Workqueue: events drm_fb_helper_damage_work
> RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
> RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
> Code: 8c fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 c4 c2 8c fd 4d 85 ed 75 2e e8 9a ba 8c fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
> RSP: 0018:ffffc9000e73fbc8 EFLAGS: 00010202
> RAX: 0000000000000000 RBX: ffffc9000dc68008 RCX: 00000000000000fe
> RDX: ffff888015340000 RSI: ffffc9000bdd9008 RDI: ffffc9000dc68008
> RBP: 00000000000003f8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff83e81e1c R11: 0000000000000000 R12: ffffc9000bdd9008
> R13: 0000000000000000 R14: ffffc9000bdd9008 R15: 0000000000000001
> FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc9000dc68008 CR3: 000000006c062000 CR4: 0000000000152ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> dma_buf_map_memcpy_to include/linux/dma-buf-map.h:245 [inline]
> drm_fb_helper_damage_blit_real drivers/gpu/drm/drm_fb_helper.c:388 [inline]
> drm_fb_helper_damage_blit drivers/gpu/drm/drm_fb_helper.c:419 [inline]
> drm_fb_helper_damage_work+0x733/0xac0 drivers/gpu/drm/drm_fb_helper.c:450
> process_one_work+0x98d/0x1600 kernel/workqueue.c:2276
> worker_thread+0x64c/0x1120 kernel/workqueue.c:2422
> kthread+0x3b1/0x4a0 kernel/kthread.c:313
> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
> Modules linked in:
> CR2: ffffc9000dc68008
> ---[ end trace 7f8625a9b15be223 ]---
> RIP: 0010:rep_movs arch/x86/lib/iomem.c:12 [inline]
> RIP: 0010:memcpy_toio+0x83/0xe0 arch/x86/lib/iomem.c:57
> Code: 8c fd 49 89 dd 31 ff 41 83 e5 02 4c 89 ee e8 c4 c2 8c fd 4d 85 ed 75 2e e8 9a ba 8c fd 48 89 e9 48 89 df 4c 89 e6 48 c1 e9 02 <f3> a5 40 f6 c5 02 74 02 66 a5 40 f6 c5 01 74 01 a4 5b 5d 41 5c 41
> RSP: 0018:ffffc9000e73fbc8 EFLAGS: 00010202
> RAX: 0000000000000000 RBX: ffffc9000dc68008 RCX: 00000000000000fe
> RDX: ffff888015340000 RSI: ffffc9000bdd9008 RDI: ffffc9000dc68008
> RBP: 00000000000003f8 R08: 0000000000000000 R09: 0000000000000001
> R10: ffffffff83e81e1c R11: 0000000000000000 R12: ffffc9000bdd9008
> R13: 0000000000000000 R14: ffffc9000bdd9008 R15: 0000000000000001
> FS: 0000000000000000(0000) GS:ffff88802cc00000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: ffffc9000dc68008 CR3: 000000006c062000 CR4: 0000000000152ee0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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2021-05-31 7:13 [syzbot] BUG: unable to handle kernel paging request in drm_fb_helper_damage_work (2) syzbot
2021-05-31 9:28 ` Borislav Petkov
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