On Thu, Dec 5, 2024 at 8:25 AM syzbot <syzbot+e5a74963d40b07387bdf@xxxxxxxxxxxxxxxxxxxxxxxxx> 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=12634587980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=704b6be2ac2f205f > dashboard link: https://syzkaller.appspot.com/bug?extid=e5a74963d40b07387bdf > 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/760a8c88d0c3/disk-c88416ba.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/46e4b0a851a2/vmlinux-c88416ba.xz > kernel image: https://storage.googleapis.com/syzbot-assets/428e2c784b75/bzImage-c88416ba.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e5a74963d40b07387bdf@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ 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 Google 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 41 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:0000000000000000 > 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: > <TASK> > 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 > </TASK> This is caused by "mm/mglru: rework workingset protection" in mm-unstable. Will post v2 today to fix this.
