linux-kernel - Re: [syzbot] [mm?] kernel BUG in z3fold_page

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Message-ID: <000000000000d64ef20622264e82@google.com>
Date: Sun, 15 Sep 2024 03:56:27 -0700
From: syzbot <syzbot+63f9ce7427394b75d9a3@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, linmiaohe@...wei.com, 
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, 
	syzkaller-bugs@...glegroups.com, vitaly.wool@...sulko.com
Subject: Re: [syzbot] [mm?] kernel BUG in z3fold_page_migrate

syzbot has found a reproducer for the following issue on:

HEAD commit:    0babf683783d Merge tag 'pinctrl-v6.11-4' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=178ae407980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=61d235cb8d15001c
dashboard link: https://syzkaller.appspot.com/bug?extid=63f9ce7427394b75d9a3
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=163fbc77980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-0babf683.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b153c86536a6/vmlinux-0babf683.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ef8726833cde/bzImage-0babf683.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+63f9ce7427394b75d9a3@...kaller.appspotmail.com

 try_to_shrink_lruvec+0x9ab/0xbb0 mm/vmscan.c:4755
 shrink_one+0x3b9/0x850 mm/vmscan.c:4793
 shrink_many mm/vmscan.c:4856 [inline]
 lru_gen_shrink_node mm/vmscan.c:4934 [inline]
 shrink_node+0x3799/0x3de0 mm/vmscan.c:5914
 kswapd_shrink_node mm/vmscan.c:6742 [inline]
 balance_pgdat mm/vmscan.c:6934 [inline]
 kswapd+0x1cbc/0x3720 mm/vmscan.c:7203
------------[ cut here ]------------
kernel BUG at mm/z3fold.c:1293!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 29 Comm: kcompactd1 Not tainted 6.11.0-rc7-syzkaller-00149-g0babf683783d #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:z3fold_page_migrate+0xafd/0xf50 mm/z3fold.c:1293
Code: ff 4c 89 f7 48 c7 c6 40 36 18 8c e8 9d 17 d7 ff 90 0f 0b e8 25 ba 8c ff 48 8b 7c 24 08 48 c7 c6 a0 36 18 8c e8 84 17 d7 ff 90 <0f> 0b f3 0f 1e fa 48 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 dc be 8c
RSP: 0018:ffffc900004fed98 EFLAGS: 00010246
RAX: 2ac19587b3dc5700 RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001
RBP: ffffea00012a6f80 R08: ffffffff9018766f R09: 1ffffffff2030ecd
R10: dffffc0000000000 R11: fffffbfff2030ece R12: dffffc0000000000
R13: ffffffff8c1834a8 R14: ffffea0001157580 R15: 1ffffd400022aeb0
FS:  0000000000000000(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000003793000 CR3: 0000000011e16000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 move_to_new_folio+0x99e/0x12e0 mm/migrate.c:999
 migrate_folio_move mm/migrate.c:1288 [inline]
 migrate_pages_batch+0x2527/0x3560 mm/migrate.c:1818
 migrate_pages_sync mm/migrate.c:1911 [inline]
 migrate_pages+0x262b/0x3460 mm/migrate.c:1993
 compact_zone+0x3404/0x4af0 mm/compaction.c:2671
 compact_node+0x2de/0x460 mm/compaction.c:2935
 kcompactd+0x788/0x1530 mm/compaction.c:3233
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:z3fold_page_migrate+0xafd/0xf50 mm/z3fold.c:1293
Code: ff 4c 89 f7 48 c7 c6 40 36 18 8c e8 9d 17 d7 ff 90 0f 0b e8 25 ba 8c ff 48 8b 7c 24 08 48 c7 c6 a0 36 18 8c e8 84 17 d7 ff 90 <0f> 0b f3 0f 1e fa 48 89 ee 48 81 e6 ff 0f 00 00 31 ff e8 dc be 8c
RSP: 0018:ffffc900004fed98 EFLAGS: 00010246
RAX: 2ac19587b3dc5700 RBX: 0000000000000000 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8c0ad560 RDI: 0000000000000001
RBP: ffffea00012a6f80 R08: ffffffff9018766f R09: 1ffffffff2030ecd
R10: dffffc0000000000 R11: fffffbfff2030ece R12: dffffc0000000000
R13: ffffffff8c1834a8 R14: ffffea0001157580 R15: 1ffffd400022aeb0
FS:  0000000000000000(0000) GS:ffff88801fe00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000003cf5010 CR3: 000000001f032000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.