syzbot
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: 1d09h
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Last patch testing requests (1)
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>
* Struck through repros no longer work on HEAD.