syzbot


WARNING in folio_update_gen

Status: upstream: reported on 2024/11/04 21:57
Subsystems: mm
[Documentation on labels]
Reported-by: syzbot+e5a74963d40b07387bdf@syzkaller.appspotmail.com
First crash: 17d, last: 17d
Discussions (2)
Title Replies (including bot) Last reply
Re: [PATCH v1 5/6] memcg-v1: no need for memcg locking for MGLRU 3 (3) 2024/11/04 22:18
[syzbot] [mm?] WARNING in folio_update_gen 0 (1) 2024/11/04 21:57

Sample crash report:
------------[ 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>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/11/03 19:09 linux-next c88416ba074a f00eed24 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root WARNING in folio_update_gen
* Struck through repros no longer work on HEAD.