linux-kernel - [syzbot] [bcachefs?] Unable to handle kernel execute from non-executable memory at virtual address ADDR

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Message-ID: <00000000000060ef65061f8cb3d4@google.com>
Date: Tue, 13 Aug 2024 01:50:25 -0700
From: syzbot <syzbot+8798e95c2e5511646dac@...kaller.appspotmail.com>
To: bfoster@...hat.com, kent.overstreet@...ux.dev, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] Unable to handle kernel execute from
 non-executable memory at virtual address ADDR

Hello,

syzbot found the following issue on:

HEAD commit:    c912bf709078 Merge remote-tracking branches 'origin/arm64-..
git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
console output: https://syzkaller.appspot.com/x/log.txt?x=11028061980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=35545feca25ede03
dashboard link: https://syzkaller.appspot.com/bug?extid=8798e95c2e5511646dac
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
userspace arch: arm64

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/caeac6485006/disk-c912bf70.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/501c87f28da9/vmlinux-c912bf70.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6812e99b7182/Image-c912bf70.gz.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8798e95c2e5511646dac@...kaller.appspotmail.com

Unable to handle kernel execute from non-executable memory at virtual address ffff0000f1a56540
KASAN: maybe wild-memory-access in range [0xfffc00078d2b2a00-0xfffc00078d2b2a07]
Mem abort info:
  ESR = 0x000000008600000f
  EC = 0x21: IABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x0f: level 3 permission fault
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001aca1d000
[ffff0000f1a56540] pgd=0000000000000000, p4d=180000023ffff003, pud=180000023f41b003, pmd=180000023f28d003, pte=0068000131a56707
Internal error: Oops: 000000008600000f [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 6849 Comm: bch-reclaim/loo Not tainted 6.10.0-rc7-syzkaller-gc912bf709078 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : 0xffff0000f1a56540
lr : __bch2_increment_clock+0x45c/0x4f8 fs/bcachefs/clock.c:152
sp : ffff8000a06c6510
x29: ffff8000a06c6540 x28: ffff0000f5200000 x27: dfff800000000000
x26: ffff0000f5204b78 x25: ffff0000f5204b80 x24: 0000000000000001
x23: ffff0000eb1e1008 x22: ffff0000f5204b30 x21: ffff0000f5204b18
x20: ffff8000a0417620 x19: ffff8000a0417620 x18: 1fffe000367a85de
x17: ffff80008f2dd000 x16: ffff80008032d32c x15: 0000000000000001
x14: 1fffe000367ab200 x13: 0000000000000000 x12: 0000000000000003
x11: 0000000000000001 x10: 0000000000000003 x9 : 0000000000000001
x8 : ffff0000f1a56540 x7 : ffff8000802a3bb0 x6 : 0000000000000000
x5 : 0000000000000001 x4 : 0000000000000001 x3 : 0000000000000000
x2 : 0000000000000007 x1 : ffff80008b2c0360 x0 : ffff8000a0417620
Call trace:
 0xffff0000f1a56540
 bch2_increment_clock fs/bcachefs/clock.h:19 [inline]
 bch2_btree_node_alloc+0x874/0xd9c fs/bcachefs/btree_update_interior.c:427
 bch2_btree_node_alloc_replacement+0xf4/0x904 fs/bcachefs/btree_update_interior.c:448
 btree_split+0x1530/0x4c84 fs/bcachefs/btree_update_interior.c:1662
 bch2_btree_split_leaf+0x148/0x734 fs/bcachefs/btree_update_interior.c:1857
 bch2_trans_commit_error+0x2a4/0x1068 fs/bcachefs/btree_trans_commit.c:918
 __bch2_trans_commit+0x35e4/0x592c fs/bcachefs/btree_trans_commit.c:1138
 bch2_trans_commit fs/bcachefs/btree_update.h:170 [inline]
 wb_flush_one_slowpath+0x114/0x158 fs/bcachefs/btree_write_buffer.c:126
 wb_flush_one+0x870/0xd88 fs/bcachefs/btree_write_buffer.c:168
 bch2_btree_write_buffer_flush_locked+0x1200/0x243c fs/bcachefs/btree_write_buffer.c:347
 btree_write_buffer_flush_seq+0x6d0/0x7e8 fs/bcachefs/btree_write_buffer.c:442
 bch2_btree_write_buffer_journal_flush+0x58/0x94 fs/bcachefs/btree_write_buffer.c:457
 journal_flush_pins+0x524/0xa10 fs/bcachefs/journal_reclaim.c:553
 __bch2_journal_reclaim+0x71c/0x1024 fs/bcachefs/journal_reclaim.c:685
 bch2_journal_reclaim_thread+0x154/0x4b8 fs/bcachefs/journal_reclaim.c:727
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860
Code: ffffffff ffffffff 00000000 00000000 (ffffffff) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	ffffffff 	.inst	0xffffffff ; undefined
   4:	ffffffff 	.inst	0xffffffff ; undefined
* 10:	ffffffff 	.inst	0xffffffff ; undefined <-- trapping instruction


---
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