WARNING in __mod_zone_page_state

Status: upstream: reported C repro on 2026/08/29 17:52
Subsystems: mm
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+cd2073ee6d958a8d0fcd@syzkaller.appspotmail.com
First crash: 4d02h, last: 1d08h
✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
20a9cbf8 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ✅ VMHostTrigger: ❌ WARNING in __mod_zone_page_state 2026/08/29 00:01 2026/08/29 00:01 2026/08/29 00:03 bcbc8ceb
236e5b35 repro-c Reproduced: ✅ WARNING in __mod_zone_page_state 2026/08/27 19:16 2026/08/27 19:17 2026/08/27 19:48 bd6de8ec
f461eb36 assessment-security 💥 WARNING in __mod_zone_page_state 2026/08/27 01:25 2026/08/27 01:25 2026/08/27 01:25 a2b77b9e
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [mm?] WARNING in __mod_zone_page_state 0 (1) 2026/08/29 17:52
Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/28 10:08 51m nogikh@google.com git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 818bebeb63dd6bf5f4e07e145f6cdbace520a34c report job log log

Sample crash report:
smpboot: CPU 1 is now offline
------------[ cut here ]------------
IS_ENABLED(CONFIG_PREEMPT_COUNT) && __lockdep_enabled && (preempt_count() == 0 && this_cpu_read(hardirqs_enabled))
WARNING: mm/vmstat.c:361 at __mod_zone_page_state+0x96/0x190 mm/vmstat.c:361, CPU#2: syz-executor412/6040
Modules linked in:
CPU: 2 UID: 0 PID: 6040 Comm: syz-executor412 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:__mod_zone_page_state+0x96/0x190 mm/vmstat.c:361
Code: d0 00 00 00 8b 05 3e 44 ea 0e 85 c0 74 1f 65 8b 05 87 e0 2e 12 65 0b 05 d0 99 2e 12 75 0f 65 8b 05 d3 db 2e 12 85 c0 74 04 90 <0f> 0b 90 48 c7 c7 c0 e7 ff 8b e8 3b b3 6d 09 65 48 0f be 5d 00 48
RSP: 0018:ffffc9000627f8e0 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 1ffffffff2287150
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88807ffd79b8
RBP: ffffffff9489f448 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffffffffffff
R13: 0000000000000008 R14: ffff88807ffd7940 R15: ffffffff9489f440
FS:  00005555785ce400(0000) GS:ffff8880d5da2000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005608d531ffb8 CR3: 000000002cb7c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __zone_stat_mod_folio include/linux/vmstat.h:410 [inline]
 __munlock_folio mm/mlock.c:144 [inline]
 mlock_folio_batch+0xf97/0x36e0 mm/mlock.c:204
 mlock_drain_remote+0xe5/0x140 mm/mlock.c:230
 page_alloc_cpu_dead+0x16/0x130 mm/page_alloc.c:6468
 cpuhp_invoke_callback+0x3b4/0x9a0 kernel/cpu.c:194
 __cpuhp_invoke_callback_range+0x158/0x1d0 kernel/cpu.c:972
 cpuhp_invoke_callback_range kernel/cpu.c:996 [inline]
 cpuhp_down_callbacks kernel/cpu.c:1386 [inline]
 _cpu_down+0x523/0x1020 kernel/cpu.c:1457
 cpu_down_maps_locked kernel/cpu.c:1483 [inline]
 cpu_down kernel/cpu.c:1491 [inline]
 cpu_device_down+0x82/0xc0 kernel/cpu.c:1508
 device_offline drivers/base/core.c:4283 [inline]
 device_offline+0x2f4/0x400 drivers/base/core.c:4267
 online_store+0xd1/0x180 drivers/base/core.c:2883
 dev_attr_store+0x58/0x80 drivers/base/core.c:2509
 sysfs_kf_write+0xf2/0x150 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x3e0/0x5f0 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6af/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f90996d005e
Code: 08 0f 85 f5 e2 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 <c3> 90 41 57 41 56 4d 89 c6 41 55 4d 89 cd 41 54 55 53 48 83 ec 08
RSP: 002b:00007ffd7eb94578 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00005555785ce400 RCX: 00007f90996d005e
RDX: 0000000000000002 RSI: 00007f90997150ff RDI: 0000000000000003
RBP: 00007f90997175e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9099717578
R13: 00007f909971509a R14: 00007f90997150b9 R15: 0000000000000002
 </TASK>

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/28 11:10 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 818bebeb63dd a9a1fc32 .config console log report C ci-qemu-upstream WARNING in __mod_zone_page_state
2026/08/25 17:47 upstream 66498c75b4f8 a9a1fc32 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in __mod_zone_page_state
* Struck through repros no longer work on HEAD.