linux-kernel - [syzbot] [f2fs?] BUG: unable to handle kernel paging request in has_enough_free

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Message-ID: <67973c2b.050a0220.11b1bb.0089.GAE@google.com>
Date: Sun, 26 Jan 2025 23:56:27 -0800
From: syzbot <syzbot+b6b347b7a4ea1b2e29b6@...kaller.appspotmail.com>
To: chao@...nel.org, jaegeuk@...nel.org, 
	linux-f2fs-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [f2fs?] BUG: unable to handle kernel paging request in has_enough_free_secs

Hello,

syzbot found the following issue on:

HEAD commit:    df60eac9efe8 Merge tag 'for-linus-6.14-1' of https://githu..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10e14a38580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e56f16478dfabb4
dashboard link: https://syzkaller.appspot.com/bug?extid=b6b347b7a4ea1b2e29b6
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/c42a22eab378/disk-df60eac9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e8d947efbb6a/vmlinux-df60eac9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0225eaefda10/bzImage-df60eac9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b6b347b7a4ea1b2e29b6@...kaller.appspotmail.com

F2FS-fs (loop3): Stopped filesystem due to reason: 7
kworker/u8:7: attempt to access beyond end of device
loop3: rw=1, sector=45096, nr_sectors = 8 limit=40427
BUG: unable to handle page fault for address: ffffed1604ea3dfa
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 23ffee067 P4D 23ffee067 PUD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 0 UID: 0 PID: 2977 Comm: kworker/u8:7 Not tainted 6.13.0-syzkaller-04541-gdf60eac9efe8 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
Workqueue: writeback wb_workfn (flush-7:3)
RIP: 0010:get_ckpt_valid_blocks fs/f2fs/segment.h:361 [inline]
RIP: 0010:has_curseg_enough_space fs/f2fs/segment.h:570 [inline]
RIP: 0010:__get_secs_required fs/f2fs/segment.h:620 [inline]
RIP: 0010:has_not_enough_free_secs fs/f2fs/segment.h:633 [inline]
RIP: 0010:has_enough_free_secs+0x575/0x1660 fs/f2fs/segment.h:649
Code: 3c 08 00 74 12 48 89 ef e8 88 30 0d fe 48 b9 00 00 00 00 00 fc ff df 4b 8d 1c 7f 48 c1 e3 04 48 03 5d 00 48 89 d8 48 c1 e8 03 <0f> b6 04 08 84 c0 0f 85 bc 02 00 00 44 0f b7 63 02 41 81 e4 ff 03
RSP: 0018:ffffc9000baa7268 EFLAGS: 00010a06
RAX: 1ffff11604ea3dfa RBX: ffff88b02751efd0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888028c058e8 R08: ffffffff83f643f7 R09: 1ffff110037e6a00
R10: dffffc0000000000 R11: ffffed10037e6a01 R12: 1ffff110037e682e
R13: ffff88801bf34170 R14: 0000000000000001 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed1604ea3dfa CR3: 0000000033f0a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 f2fs_is_checkpoint_ready fs/f2fs/segment.h:671 [inline]
 f2fs_write_inode+0x425/0x540 fs/f2fs/inode.c:791
 write_inode fs/fs-writeback.c:1525 [inline]
 __writeback_single_inode+0x708/0x10d0 fs/fs-writeback.c:1745
 writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976
 wb_writeback+0x413/0xb80 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x410/0x1080 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3317
 worker_thread+0x870/0xd30 kernel/workqueue.c:3398
 kthread+0x7a9/0x920 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
CR2: ffffed1604ea3dfa
---[ end trace 0000000000000000 ]---
RIP: 0010:get_ckpt_valid_blocks fs/f2fs/segment.h:361 [inline]
RIP: 0010:has_curseg_enough_space fs/f2fs/segment.h:570 [inline]
RIP: 0010:__get_secs_required fs/f2fs/segment.h:620 [inline]
RIP: 0010:has_not_enough_free_secs fs/f2fs/segment.h:633 [inline]
RIP: 0010:has_enough_free_secs+0x575/0x1660 fs/f2fs/segment.h:649
Code: 3c 08 00 74 12 48 89 ef e8 88 30 0d fe 48 b9 00 00 00 00 00 fc ff df 4b 8d 1c 7f 48 c1 e3 04 48 03 5d 00 48 89 d8 48 c1 e8 03 <0f> b6 04 08 84 c0 0f 85 bc 02 00 00 44 0f b7 63 02 41 81 e4 ff 03
RSP: 0018:ffffc9000baa7268 EFLAGS: 00010a06
RAX: 1ffff11604ea3dfa RBX: ffff88b02751efd0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffff888028c058e8 R08: ffffffff83f643f7 R09: 1ffff110037e6a00
R10: dffffc0000000000 R11: ffffed10037e6a01 R12: 1ffff110037e682e
R13: ffff88801bf34170 R14: 0000000000000001 R15: 00000000ffffffff
FS:  0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffed1604ea3dfa CR3: 0000000033f0a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	3c 08                	cmp    $0x8,%al
   2:	00 74 12 48          	add    %dh,0x48(%rdx,%rdx,1)
   6:	89 ef                	mov    %ebp,%edi
   8:	e8 88 30 0d fe       	call   0xfe0d3095
   d:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  14:	fc ff df
  17:	4b 8d 1c 7f          	lea    (%r15,%r15,2),%rbx
  1b:	48 c1 e3 04          	shl    $0x4,%rbx
  1f:	48 03 5d 00          	add    0x0(%rbp),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	0f b6 04 08          	movzbl (%rax,%rcx,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 bc 02 00 00    	jne    0x2f2
  36:	44 0f b7 63 02       	movzwl 0x2(%rbx),%r12d
  3b:	41                   	rex.B
  3c:	81                   	.byte 0x81
  3d:	e4 ff                	in     $0xff,%al
  3f:	03                   	.byte 0x3


---
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