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ada2fe7eead31-4afcaa1b3f4mr1474027137.8.1733438094317; Thu, 05 Dec 2024 14:34:54 -0800 (PST) MIME-Version: 1.0 References: <67294349.050a0220.701a.0010.GAE@google.com> In-Reply-To: <67294349.050a0220.701a.0010.GAE@google.com> From: Yu Zhao Date: Thu, 5 Dec 2024 15:34:16 -0700 Message-ID: Subject: Re: [syzbot] [mm?] WARNING in folio_update_gen To: syzbot Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, akpm@linux-foundation.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: B0AFB1C0015 X-Rspam-User: X-Stat-Signature: 6dmxxcxh8fibwnmcembzr1fdc4jqzjbt X-HE-Tag: 1733438064-280807 X-HE-Meta: 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owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Dec 5, 2024 at 8:25=E2=80=AFAM syzbot wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: c88416ba074a Add linux-next specific files for 20241101 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1263458798000= 0 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D704b6be2ac2f2= 05f > dashboard link: https://syzkaller.appspot.com/bug?extid=3De5a74963d40b073= 87bdf > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Deb= ian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/760a8c88d0c3/dis= k-c88416ba.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/46e4b0a851a2/vmlinu= x-c88416ba.xz > kernel image: https://storage.googleapis.com/syzbot-assets/428e2c784b75/b= zImage-c88416ba.xz > > IMPORTANT: if you fix the issue, please add the following tag to the comm= it: > Reported-by: syzbot+e5a74963d40b07387bdf@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 0 PID: 85 at mm/vmscan.c:3140 folio_update_gen+0x23d/0x250 = mm/vmscan.c:3140 > Modules linked in: > CPU: 0 UID: 0 PID: 85 Comm: kswapd0 Not tainted 6.12.0-rc5-next-20241101-= syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS G= oogle 09/13/2024 > RIP: 0010:folio_update_gen+0x23d/0x250 mm/vmscan.c:3140 > Code: 00 48 3b 4c 24 60 75 2a 48 c1 e8 29 83 e0 07 ff c8 48 8d 65 d8 5b 4= 1 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc e8 74 c0 bf ff 90 <0f> 0b 90 e9 91= fe ff ff e8 46 9f ee 09 66 0f 1f 44 00 00 90 90 90 > RSP: 0018:ffffc900020deb40 EFLAGS: 00010293 > RAX: ffffffff81d5fd8c RBX: 0000000000000000 RCX: ffff88801cbb8000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffc900020dec00 R08: ffffffff81d5fc19 R09: 1ffff1100d562d00 > R10: dffffc0000000000 R11: ffffed100d562d01 R12: 0000000000000003 > R13: 1ffff9200041bd70 R14: ffffc900020deb80 R15: ffffea0001308000 > FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000= 000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f7fecc34866 CR3: 00000000223a2000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > walk_pmd_range_locked+0x92b/0xf90 mm/vmscan.c:3514 > walk_pmd_range mm/vmscan.c:3594 [inline] > walk_pud_range+0x1f16/0x2310 mm/vmscan.c:3621 > walk_p4d_range mm/pagewalk.c:259 [inline] > walk_pgd_range+0x4a9/0x17e0 mm/pagewalk.c:305 > __walk_page_range+0x15f/0x700 mm/pagewalk.c:412 > walk_page_range_mm+0x58f/0x7c0 mm/pagewalk.c:505 > walk_mm mm/vmscan.c:3665 [inline] > try_to_inc_max_seq+0xdd9/0x13b0 mm/vmscan.c:3902 > get_nr_to_scan mm/vmscan.c:4740 [inline] > try_to_shrink_lruvec+0xb30/0xc70 mm/vmscan.c:4783 > shrink_one+0x3b9/0x850 mm/vmscan.c:4832 > shrink_many mm/vmscan.c:4895 [inline] > lru_gen_shrink_node mm/vmscan.c:4973 [inline] > shrink_node+0x37cd/0x3e60 mm/vmscan.c:5954 > kswapd_shrink_node mm/vmscan.c:6783 [inline] > balance_pgdat mm/vmscan.c:6975 [inline] > kswapd+0x1ca9/0x3700 mm/vmscan.c:7244 > 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 > This is caused by "mm/mglru: rework workingset protection" in mm-unstable. Will post v2 today to fix this.