From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Borislav Petkov <bp@alien8.de>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Andrew Morton <akpm@linux-foundation.org>,
Joerg Roedel <jroedel@suse.de>
Subject: Re: [GIT PULL] x86/mm changes for v5.9
Date: Wed, 5 Aug 2020 13:03:48 +0200 [thread overview]
Message-ID: <20200805110348.GA108872@zx2c4.com> (raw)
In-Reply-To: <20200803190354.GA1293087@gmail.com>
Hi Ingo, Joerg,
On Mon, Aug 03, 2020 at 09:03:54PM +0200, Ingo Molnar wrote:
> Linus,
>
> Please pull the latest x86/mm git tree from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86-mm-2020-08-03
>
> # HEAD: 2b32ab031e82a109e2c5b0d30ce563db0fe286b4 x86/mm/64: Make sync_global_pgds() static
>
> The biggest change is to not sync the vmalloc and ioremap ranges for x86-64 anymore.
>
> Thanks,
>
> Ingo
>
> ------------------>
> Joerg Roedel (3):
> x86/mm: Pre-allocate P4D/PUD pages for vmalloc area
> x86/mm/64: Do not sync vmalloc/ioremap mappings
> x86/mm/64: Make sync_global_pgds() static
The commit 8bb9bf242d1f ("x86/mm/64: Do not sync vmalloc/ioremap
mappings") causes the OOPS below, in Linus' tree and in linux-next,
unearthed by my CI on <https://www.wireguard.com/build-status/>.
Bisecting reveals 8bb9bf242d1f, and reverting this makes the OOPS go
away.
Jason
BUG: unable to handle page fault for address: ffffe8ffffd00608
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] PREEMPT SMP
CPU: 2 PID: 22 Comm: kworker/2:0 Not tainted 5.8.0+ #154
RIP: 0010:process_one_work+0x2c/0x2d0
Code: 41 56 41 55 41 54 55 48 89 f5 53 48 89 fb 48 83 ec 08 48 8b 06 4c 8b 67 40 49 89 c6 45 30 f6 a8 04 b8 00 00 00 00 4c 0f 44 f0 <49> 8b 46 08 44 8b a8 00 01 05
RSP: 0018:ffff88800016be98 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff888000010c00 RCX: 0000000000000000
RDX: 00000000fffedb85 RSI: ffff888000391900 RDI: ffff888000010c00
RBP: ffff888000391900 R08: ffff888000391900 R09: ffff888000350090
R10: ffffffffff770df6 R11: ffff88800f91f840 R12: ffff88800f91f140
R13: ffff88800f91f160 R14: ffffe8ffffd00600 R15: ffff88800f91f140
FS: 0000000000000000(0000) GS:ffff88800f900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffe8ffffd00608 CR3: 00000000001be005 CR4: 00000000001706a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
worker_thread+0x4b/0x3b0
? rescuer_thread+0x360/0x360
kthread+0x116/0x140
? __kthread_create_worker+0x110/0x110
ret_from_fork+0x1f/0x30
CR2: ffffe8ffffd00608
---[ end trace ca0cfc5a79414fb2 ]---
RIP: 0010:process_one_work+0x2c/0x2d0
Code: 41 56 41 55 41 54 55 48 89 f5 53 48 89 fb 48 83 ec 08 48 8b 06 4c 8b 67 40 49 89 c6 45 30 f6 a8 04 b8 00 00 00 00 4c 0f 44 f0 <49> 8b 46 08 44 8b a8 00 01 05
RSP: 0018:ffff88800016be98 EFLAGS: 00010002
RAX: 0000000000000000 RBX: ffff888000010c00 RCX: 0000000000000000
RDX: 00000000fffedb85 RSI: ffff888000391900 RDI: ffff888000010c00
RBP: ffff888000391900 R08: ffff888000391900 R09: ffff888000350090
R10: ffffffffff770df6 R11: ffff88800f91f840 R12: ffff88800f91f140
R13: ffff88800f91f160 R14: ffffe8ffffd00600 R15: ffff88800f91f140
FS: 0000000000000000(0000) GS:ffff88800f900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffe8ffffd00608 CR3: 00000000001be005 CR4: 00000000001706a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Kernel panic - not syncing: Fatal exception
next prev parent reply other threads:[~2020-08-05 18:23 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-03 19:03 [GIT PULL] x86/mm changes for v5.9 Ingo Molnar
2020-08-04 0:50 ` pr-tracker-bot
2020-08-05 11:03 ` Jason A. Donenfeld [this message]
2020-08-05 17:05 ` Linus Torvalds
2020-08-06 13:10 ` Ingo Molnar
2020-08-06 18:57 ` Joerg Roedel
2020-08-06 19:02 ` Linus Torvalds
2020-08-06 19:23 ` Joerg Roedel
2020-08-06 19:42 ` Linus Torvalds
2020-08-06 19:57 ` Tejun Heo
2020-08-07 9:53 ` Jason A. Donenfeld
2020-08-06 21:20 ` Ingo Molnar
2020-08-07 8:47 ` Joerg Roedel
2020-08-13 19:30 ` Ingo Molnar
2020-08-13 19:38 ` Linus Torvalds
2020-08-14 14:26 ` Joerg Roedel
2020-08-06 22:56 ` Joerg Roedel
2020-08-06 23:12 ` Joerg Roedel
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