KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2)

Status: moderation: reported on 2024/08/30 11:59
Subsystems: kernel
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+ced4d9a8cadb5ef3adae@syzkaller.appspotmail.com
First crash: 693d, last: 5h57m
✨ AI Jobs (5)
ID Workflow Result Correct Bug Created Started Finished Revision Error
0066b235 assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ✅ VMHostTrigger: ❌ KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2) 2026/05/31 17:21 2026/05/31 17:21 2026/05/31 17:24 6b4a8443

			
		
47f163b6 assessment-security 💥 KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2) 2026/05/15 05:51 2026/05/15 05:51 2026/05/15 05:52 6ccb967e
failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128
From /app/workdir/repo/linux
 * branch                HEAD       -> FETCH_HEAD
Updating files:  ...
truncated to first 200 bytes; open job for full error
21ff92f9 repro KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2) 2026/03/07 04:28 2026/03/07 04:28 2026/03/07 04:31 31e9c887

			
		
be02103c assessment-kcsan Benign: ✅ Confident: ✅ KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2) 2026/02/24 18:42 2026/02/24 18:42 2026/02/24 18:46 305c0ec5

			
		
17baa52a assessment-kcsan 💥 KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 (2) 2026/01/09 22:46 2026/01/09 22:46 2026/01/09 22:46 75199160
Error 429, Message: You exceeded your current quota, please check your plan and billing details. For more information on this error, head to: https://ai.google.dev/gemini-api/docs/rate-limits. To moni...
truncated to first 200 bytes; open job for full error
Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64 kernel 6 334 732d 959d 0/29 auto-obsoleted due to no activity on 2024/08/19 05:50

Sample crash report:
==================================================================
BUG: KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64

read-write to 0xffffffff86c07a00 of 8 bytes by interrupt on cpu 1:
 tick_do_update_jiffies64+0x113/0x1c0 kernel/time/tick-sched.c:118
 tick_limited_update_jiffies64 kernel/time/tick-sched.c:220 [inline]
 tick_sched_do_timer kernel/time/tick-sched.c:264 [inline]
 tick_nohz_handler+0x328/0x380 kernel/time/tick-sched.c:310
 __run_hrtimer kernel/time/hrtimer.c:2032 [inline]
 __hrtimer_run_queues+0x1f8/0x510 kernel/time/hrtimer.c:2096
 hrtimer_interrupt+0x257/0x810 kernel/time/hrtimer.c:2215
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x5f/0x1c0 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0x32/0x80 arch/x86/kernel/apic/apic.c:1062
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674

read to 0xffffffff86c07a00 of 8 bytes by task 15710 on cpu 0:
 mem_cgroup_flush_stats_ratelimited+0x29/0x50 mm/memcontrol.c:743
 count_shadow_nodes+0x6a/0x250 mm/workingset.c:694
 do_shrink_slab+0x61/0x650 mm/shrinker.c:389
 shrink_slab_memcg mm/shrinker.c:560 [inline]
 shrink_slab+0x53b/0x8e0 mm/shrinker.c:638
 shrink_node_memcgs mm/vmscan.c:6129 [inline]
 shrink_node+0x6d9/0x20f0 mm/vmscan.c:6171
 shrink_zones mm/vmscan.c:6410 [inline]
 do_try_to_free_pages+0x408/0xc90 mm/vmscan.c:6472
 try_to_free_mem_cgroup_pages+0x201/0x420 mm/vmscan.c:6794
 try_charge_memcg+0x375/0xa00 mm/memcontrol.c:2655
 obj_cgroup_charge_pages mm/memcontrol.c:3097 [inline]
 __memcg_kmem_charge_page+0x199/0x3a0 mm/memcontrol.c:3141
 __alloc_frozen_pages_noprof+0x18a/0x350 mm/page_alloc.c:5321
 alloc_pages_mpol+0xa9/0x1d0 mm/mempolicy.c:2490
 alloc_frozen_pages_noprof mm/mempolicy.c:2561 [inline]
 alloc_pages_noprof+0x8f/0x140 mm/mempolicy.c:2581
 vm_area_alloc_pages mm/vmalloc.c:3742 [inline]
 __vmalloc_area_node mm/vmalloc.c:3892 [inline]
 __vmalloc_node_range_noprof+0xae9/0x11e0 mm/vmalloc.c:4082
 __kvmalloc_node_noprof+0x3a0/0x590 mm/slub.c:6961
 futex_hash_allocate+0x192/0x920 kernel/futex/core.c:1823
 futex_hash_prctl+0xd8/0xf0 kernel/futex/core.c:1995
 __do_sys_prctl kernel/sys.c:2885 [inline]
 __se_sys_prctl+0x4f4/0x13b0 kernel/sys.c:2534
 __x64_sys_prctl+0x67/0x80 kernel/sys.c:2534
 x64_sys_call+0x2533/0x3020 arch/x86/include/generated/asm/syscalls_64.h:158
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x136/0x3c0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x0000000100006da1 -> 0x0000000100006da7

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 15710 Comm: syz.3.3150 Tainted: G        W           syzkaller #0 PREEMPT(lazy) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
==================================================================
EXT4-fs (loop3): unmounting filesystem 00000000-0000-0000-0000-000000000900.

Crashes (738):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/24 18:45 upstream 48a5a7ab8d6a dd737a83 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/23 23:03 upstream d326f83e819c 71a13572 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/23 13:21 upstream 4539944e5151 71a13572 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/23 10:27 upstream 4539944e5151 881ce5c2 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/21 05:24 upstream b95f03f04d47 de6a700d .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/20 06:45 upstream 82a47586c0b9 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/19 09:45 upstream c6859eed755d 72524a66 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/17 16:36 upstream fce2dfa773ce 8aaff637 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/16 13:52 upstream 37e2f878a7a6 71b49442 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/16 10:25 upstream 37e2f878a7a6 27a8bd60 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/14 11:57 upstream 3b029c035b34 2130f682 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/13 09:58 upstream a13c140cc289 d78ea535 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/10 15:04 upstream a635d6748234 99e64375 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/10 04:41 upstream a635d6748234 4167ee25 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/09 19:12 upstream 2c7c88a412aa a0c310a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/07 13:48 upstream 0e35b9b6ec0f 76cdc0c0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/07 06:46 upstream 0e35b9b6ec0f 8e71ce95 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/06 20:21 upstream 8cdeaa50eae8 88b240e4 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/05 17:59 upstream f105f3631d51 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/05 04:23 upstream 7404ce516372 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/04 13:51 upstream 1e9cdc2ea15a fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/04 01:11 upstream 71dfdfb0209b fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/03 10:56 upstream 51512e22efe8 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/03 01:01 upstream 4a50a141f05a 2b70b115 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/07/01 12:01 upstream 665159e24674 00a5cf1c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/30 11:09 upstream dc59e4fea9d8 fff8d0a0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/29 15:35 upstream dc59e4fea9d8 6a0c72dc .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/27 23:52 upstream 780d569e6c4b fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/27 02:49 upstream 51cb1aa1250c fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/25 20:21 upstream a142da0b2d32 7ff32d8b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/25 08:10 upstream ab9de95c9cf9 cfa969bf .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/24 13:54 upstream 840ef6c78e6a 302586aa .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/21 08:24 upstream 390d73adf896 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/20 01:29 upstream 5e2e14749c3d 43bfcdb0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/18 11:28 upstream e771677c937d a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/17 01:19 upstream 6b5a2b7d9bc1 62cc6db3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/16 04:50 upstream a87bbc4578fd 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/15 18:34 upstream 0e0611827f33 50bb0618 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/15 04:35 upstream 95e56f0f293e 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/14 16:17 upstream 8cd9520d35a6 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/14 07:30 upstream 2b07ea76fd28 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/13 08:32 upstream 062871f1371b 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/12 16:48 upstream 1dadb7e7eb5a 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/11 17:37 upstream 9716c086c8e8 d93a6ab6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/10 10:03 upstream 685441a6d3f1 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/09 23:21 upstream 2d3090a8aeb5 34dab4be .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/08 15:41 upstream 4549871118cf 656e94c6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/07 09:45 upstream 979c294509f9 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/06/06 06:00 upstream c10130c234c8 cc095639 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/05/30 23:44 upstream 9d87d0fc8c8e 6b4a8443 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/05/15 02:52 upstream 66182ca873a4 6ccb967e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/03/06 05:33 upstream 5ee8dbf54602 31e9c887 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/02/24 14:45 upstream 7dff99b35460 96b1aa46 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2026/01/09 16:20 upstream 623fb9912f6a d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
2024/08/30 11:58 upstream 20371ba12063 ee2602b8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in mem_cgroup_flush_stats_ratelimited / tick_do_update_jiffies64
* Struck through repros no longer work on HEAD.