syzbot


WARNING in css_rstat_flush

Status: upstream: reported on 2025/06/03 16:15
Subsystems: cgroups
[Documentation on labels]
Reported-by: syzbot+7a605e85e5b5a7e4a5e3@syzkaller.appspotmail.com
First crash: 6d07h, last: 21h12m
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [cgroups?] WARNING in css_rstat_flush 0 (1) 2025/06/03 16:15

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 0 PID: 18380 at kernel/cgroup/rstat.c:302 css_rstat_updated_list kernel/cgroup/rstat.c:302 [inline]
WARNING: CPU: 0 PID: 18380 at kernel/cgroup/rstat.c:302 css_rstat_flush+0x76f/0x1fa0 kernel/cgroup/rstat.c:413
Modules linked in:
CPU: 0 UID: 0 PID: 18380 Comm: kworker/0:3 Not tainted 6.15.0-syzkaller-gbaa39c169dd5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: cgroup_destroy css_free_rwork_fn
RIP: 0010:css_rstat_updated_list kernel/cgroup/rstat.c:302 [inline]
RIP: 0010:css_rstat_flush+0x76f/0x1fa0 kernel/cgroup/rstat.c:413
Code: df 80 3c 08 00 74 08 4c 89 e7 e8 0c a7 6a 00 49 8b 1c 24 48 3b 5c 24 38 74 22 e8 3c 1d 07 00 e9 72 ff ff ff e8 32 1d 07 00 90 <0f> 0b 90 eb bd e8 27 1d 07 00 45 31 e4 e9 bb 03 00 00 e8 1a 1d 07
RSP: 0018:ffffc90003357780 EFLAGS: 00010093
RAX: ffffffff81b91dae RBX: ffff888077f61800 RCX: ffff888024dc1e00
RDX: 0000000000000000 RSI: ffffffff8be26f20 RDI: ffffffff8be26ee0
RBP: ffffc900033579b8 R08: ffffffff8fa0bcf7 R09: 1ffffffff1f4179e
R10: dffffc0000000000 R11: fffffbfff1f4179f R12: ffffe8ffffc65b68
R13: ffff888077f61800 R14: ffffffff8db95c60 R15: ffff888125c5f008
FS:  0000000000000000(0000) GS:ffff888125c5f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2a6dcd CR3: 0000000078d36000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 css_rstat_exit+0xa9/0x320 kernel/cgroup/rstat.c:479
 css_free_rwork_fn+0x8b/0xc50 kernel/cgroup/cgroup.c:5449
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (4):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/06/05 02:02 bpf baa39c169dd5 fd5e6e61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in css_rstat_flush
2025/05/31 14:02 bpf 90b83efa6701 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-kasan-gce WARNING in css_rstat_flush
2025/05/30 16:11 net d3faab9b5a6a 3d2f584d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce WARNING in css_rstat_flush
2025/06/04 23:54 bpf-next cd2e103d57e5 fd5e6e61 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-bpf-next-kasan-gce WARNING in css_rstat_flush
* Struck through repros no longer work on HEAD.