INFO: rcu detected stall in clone3 (6)

Status: upstream: reported on 2026/05/28 01:12
Subsystems: mm
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+774c2dfaebdf78f984c5@syzkaller.appspotmail.com
First crash: 507d, last: 1h43m
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ID Workflow Result Correct Bug Created Started Finished Revision
39e54df7 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ✅ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ ❓ INFO: rcu detected stall in clone3 (6) 2026/05/26 02:41 2026/05/26 02:41 2026/05/26 03:55 c69befb3
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Title Replies (including bot) Last reply
[syzbot] Monthly cgroups report (Jul 2026) 0 (1) 2026/07/07 20:32
[syzbot] Monthly cgroups report (Jun 2026) 0 (1) 2026/06/06 12:32
[syzbot] [cgroups?] [mm?] INFO: rcu detected stall in clone3 (6) 0 (1) 2026/05/28 01:12
▶ ▼ Similar bugs (19)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: rcu detected stall in clone3 origin:lts-only 1 syz, C inconclusive 2 269d 333d 0/2 upstream: reported C repro on 2025/10/02 07:48
upstream INFO: rcu detected stall in clone3 (5) mm 1 7 609d 819d 0/29 auto-obsoleted due to no activity on 2025/03/30 08:38
upstream INFO: rcu detected stall in clone3 mm 1 2 1693d 1719d 0/29 closed as invalid on 2022/02/08 10:10
linux-5.15 INFO: rcu detected stall in clone3 (2) 1 1 184d 184d 0/3 auto-obsoleted due to no activity on 2026/06/09 00:21
linux-5.15 INFO: rcu detected stall in clone3 1 2 390d 425d 0/3 auto-obsoleted due to no activity on 2025/11/14 02:35
upstream INFO: rcu detected stall in clone3 (2) kernfs 1 1 1541d 1541d 0/29 auto-closed as invalid on 2022/09/10 23:49
upstream INFO: rcu detected stall in clone3 (3) kernel 1 1 1290d 1290d 0/29 auto-obsoleted due to no activity on 2023/05/19 23:49
linux-5.15 INFO: rcu detected stall in clone3 (3) 1 1 52d 52d 0/3 upstream: reported on 2026/07/10 04:09
upstream INFO: rcu detected stall in clone3 (4) mm net 1 2 1103d 1183d 0/29 auto-obsoleted due to no activity on 2023/11/22 09:08
upstream INFO: rcu detected stall in sys_clone3 (3) mm 1 26 533d 728d 0/29 auto-obsoleted due to no activity on 2025/06/14 09:25
linux-6.1 INFO: rcu detected stall in sys_clone3 (3) 1 3 647d 706d 0/3 auto-obsoleted due to no activity on 2025/03/02 13:35
upstream INFO: rcu detected stall in sys_clone3 kernfs 1 1 1562d 1562d 0/29 auto-closed as invalid on 2022/08/20 13:01
linux-5.15 INFO: rcu detected stall in sys_clone3 1 1 696d 696d 0/3 auto-obsoleted due to no activity on 2025/01/12 11:21
upstream INFO: rcu detected stall in sys_clone3 (2) mm 1 3 826d 930d 0/29 auto-obsoleted due to no activity on 2024/08/25 02:20
linux-6.1 INFO: rcu detected stall in sys_clone3 1 1 968d 965d 0/3 auto-obsoleted due to no activity on 2024/04/15 06:45
linux-6.1 INFO: rcu detected stall in sys_clone3 (4) 1 1 509d 509d 0/3 auto-obsoleted due to no activity on 2025/07/18 19:29
linux-5.15 INFO: rcu detected stall in sys_clone3 (2) 1 1 563d 563d 0/3 auto-obsoleted due to no activity on 2025/05/25 09:12
linux-6.1 INFO: rcu detected stall in sys_clone3 (2) 1 1 829d 829d 0/3 auto-obsoleted due to no activity on 2024/09/01 21:33
android-5-10 BUG: soft lockup in sys_clone3 1 1 236d 236d 0/2 auto-obsoleted due to no activity on 2026/04/07 17:52

Sample crash report:
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P29340/1:b..l
rcu: 	(detected by 0, t=10508 jiffies, g=265413, q=1524 ncpus=2)
task:syz.4.5891      state:R  running task     stack:25192 pid:29340 tgid:29339 ppid:18070  task_flags:0x400140 flags:0x00080003
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5520 [inline]
 __schedule+0x17d4/0x5820 kernel/sched/core.c:7270
 preempt_schedule_irq+0x4b/0x90 kernel/sched/core.c:7592
 irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:539 [inline]
 irqentry_exit+0x14f/0x910 kernel/entry/common.c:167
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:rcu_is_watching+0x69/0xb0 kernel/rcu/tree.c:754
Code: f7 e8 1b 30 8b 00 48 c7 c3 18 5a 95 93 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 35 8b 03 65 48 ff 0d 77 d4 e7 11 <74> 11 83 e0 04 c1 e8 02 5b 41 5e 41 5f c3 cc cc cc cc cc e8 ef 19
RSP: 0018:ffffc900032df1d0 EFLAGS: 00000286
RAX: 0000000001017cec RBX: ffff8880b8733a18 RCX: 8000000000000001
RDX: 0000000000000000 RSI: ffffffff8c6d8b60 RDI: ffffffff8c6d8b20
RBP: 1ffff9200065be78 R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900032df388 R11: fffff5200065be7d R12: ffffffff8ed5c6e0
R13: 0000000000000002 R14: ffffffff8e7477d8 R15: dffffc0000000000
 trace_lock_acquire include/trace/events/lock.h:23 [inline]
 lock_acquire+0x58/0x350 kernel/locking/lockdep.c:5871
 rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 rcu_read_lock include/linux/rcupdate.h:849 [inline]
 class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 unwind_next_frame+0xac/0x2550 arch/x86/kernel/unwind_orc.c:495
 __unwind_start+0x514/0x660 arch/x86/kernel/unwind_orc.c:787
 unwind_start arch/x86/include/asm/unwind.h:64 [inline]
 arch_stack_walk+0xe3/0x150 arch/x86/kernel/stacktrace.c:24
 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
 save_stack+0x122/0x230 mm/page_owner.c:183
 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:338
 reset_page_owner include/linux/page_owner.h:26 [inline]
 __free_pages_prepare mm/page_alloc.c:1418 [inline]
 __free_frozen_pages+0xc93/0xd90 mm/page_alloc.c:2962
 tlb_batch_list_free mm/mmu_gather.c:161 [inline]
 tlb_finish_mmu+0x13e/0x220 mm/mmu_gather.c:552
 exit_mmap+0x4b2/0x9f0 mm/mmap.c:1328
 __mmput+0x118/0x420 kernel/fork.c:1193
 copy_process+0x2ee8/0x43e0 kernel/fork.c:2604
 kernel_clone+0x2d7/0x940 kernel/fork.c:2766
 __do_sys_clone3 kernel/fork.c:3069 [inline]
 __se_sys_clone3+0x33c/0x360 kernel/fork.c:3048
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4151d9e159
RSP: 002b:00007f4152be0ef8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007f4151d9e159
RDX: 00007f4152be0f10 RSI: 0000000000000058 RDI: 00007f4152be0f10
RBP: 00007f4151e35024 R08: 0000000000000000 R09: 0000000000000058
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4152026038 R14: 00007f4152025fa0 R15: 00007f415214fa48
 </TASK>

Crashes (48):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/28 05:10 upstream 18fbf5151d2c e2fa417d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2026/08/25 06:42 upstream 66498c75b4f8 23caa175 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in clone3
2026/07/29 21:56 upstream fc02acf6ac0c cb1587ea .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2026/07/06 20:44 upstream 8cdeaa50eae8 88b240e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in clone3
2026/07/06 11:56 upstream 8cdeaa50eae8 88b240e4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2026/07/03 04:17 upstream 87320be9f0d2 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in clone3
2026/06/15 11:21 upstream 8cd9520d35a6 1d2f3589 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2026/05/26 00:57 upstream e8c2f9fdadee c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in clone3
2026/05/20 23:50 upstream df685633c3db 41b8c833 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: rcu detected stall in clone3
2026/05/09 16:12 upstream 70390501d194 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2026/04/03 17:21 upstream d8a9a4b11a13 4440e7c2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2026/04/02 17:43 upstream 9147566d8016 8b15d4ae .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2026/03/16 10:43 upstream f338e7738378 64e21424 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in clone3
2026/02/02 15:59 upstream 18f7fcd5e69a 018ebef2 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2026/01/12 01:45 upstream 9c7ef209cd0f d1b870e1 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in clone3
2025/12/26 21:03 upstream ccd1cdca5cd4 d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2025/10/14 23:51 upstream 9b332cece987 b6605ba8 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2025/10/12 03:56 upstream 67029a49db6c ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2025/10/08 12:52 upstream 0d97f2067c16 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: rcu detected stall in clone3
2025/07/26 22:27 upstream 5f33ebd2018c fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2025/06/04 02:35 upstream 546b1c9e93c2 a30356b7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in clone3
2025/05/08 22:32 upstream d76bb1ebb558 dbf35fa1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: rcu detected stall in clone3
2025/04/29 00:14 upstream f15d97df5afa c6b4fb39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: rcu detected stall in clone3
2025/04/11 23:52 upstream 900241a5cc15 12ba9c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: rcu detected stall in clone3
2026/08/31 22:52 net 1376afc7660b 316d9396 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/08/22 09:06 net 4e15e89faac9 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/08/21 11:41 net 746fc0787f61 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/07/05 09:57 net 660667cd4066 fcece630 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/07/03 18:39 net 87320be9f0d2 58bf2096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/06/19 00:29 net 7d8297e26b4e a776b0d0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/06/04 17:03 net c05fa14db43e 197909be .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/05/24 00:58 net 87a1e0fe7776 c69befb3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/04/26 11:37 net e728258debd5 9c2d0995 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/03/26 02:07 net c4ea7d8907cf c6143aac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/03/16 21:33 net 43d222fbcdff 0737c18f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/03/10 04:24 net 7a85d370bbd0 6972f302 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/03/05 07:33 net 126fe7ef12ff a9fe5c9e .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/02/17 23:25 net 77c5e3fdd279 39751c21 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2025/10/27 11:51 net 84a905290cb4 c0460fcd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2025/07/28 08:38 net afd8c2c9e2e2 fb8f743d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-this-kasan-gce INFO: rcu detected stall in clone3
2026/08/26 05:01 net-next 91ec20351349 6a91adb4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in clone3
2026/08/09 02:47 net-next 001b5d347d8b 5d63f80b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in clone3
2026/06/28 15:37 net-next 805185b7c7a1 fb92f11c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in clone3
2025/11/25 09:12 net-next 00f3b3251814 64219f15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in clone3
2025/06/15 22:21 net-next 8909f5f4ecd5 5f4b362d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: rcu detected stall in clone3
2025/12/30 00:19 linux-next cc3aa43b44bd d6526ea3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in clone3
2025/10/03 23:32 linux-next 47a8d4b89844 49379ee0 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-rust-kasan-gce INFO: rcu detected stall in clone3
2025/09/20 03:24 linux-next 846bd2225ec3 67c37560 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: rcu detected stall in clone3
* Struck through repros no longer work on HEAD.