WARNING in futex_pivot_pending

Status: upstream: reported C repro on 2026/08/15 14:36
Subsystems: kernel
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+9c28ada89c468ad30713@syzkaller.appspotmail.com
First crash: 7d04h, last: 2h01m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
268170df assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in futex_pivot_pending 2026/08/12 03:36 2026/08/12 03:36 2026/08/12 04:14 f8d35649
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] futex: Temporarily set the task state to running for pivot pending 1 (1) 2026/08/17 05:33
[syzbot] [kernel?] WARNING in futex_pivot_pending 2 (5) 2026/08/17 05:18
Last patch testing requests (2)
Created Duration User Patch Repo Result
2026/08/17 04:48 23m eadavis@qq.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK job log log
2026/08/16 02:25 22m eadavis@qq.com patch git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci OK job log log

Sample crash report:
------------[ cut here ]------------
do not call blocking ops when !TASK_RUNNING; state=2 set at [<000000003d62a0c3>] prepare_to_wait_event+0x2e4/0x3ac kernel/sched/wait.c:-1
WARNING: kernel/sched/core.c:9124 at __might_sleep+0xc0/0xdc kernel/sched/core.c:9120, CPU#0: syz.0.17/4920
Modules linked in:
CPU: 0 UID: 0 PID: 4920 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 63400005 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : __might_sleep+0xc0/0xdc kernel/sched/core.c:9120
lr : __might_sleep+0xc0/0xdc kernel/sched/core.c:9120
sp : ffff8000954d7930
x29: ffff8000954d7930 x28: ffff8000805a9ec8 x27: ffff8000954d7a00
x26: 0000000000000000 x25: ffff8000954d7a08 x24: 0000000000000000
x23: ffff700012a9af3c x22: ffff0000c4c716d0 x21: 0000000000000002
x20: ffff8000869ca160 x19: 000000000000026f x18: 00000000ffffffff
x17: ffff8000801682f0 x16: ffff800080168534 x15: ffff80008034b12c
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: 0000000000000002 x9 : dd2fee083d5bf500
x8 : dd2fee083d5bf500 x7 : ffff80008048ea5c x6 : 0000000000000000
x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f8870
x2 : 0000000100000000 x1 : ffff0000c4c70000 x0 : 0000000000000000
Call trace:
 __might_sleep+0xc0/0xdc kernel/sched/core.c:9120 (P)
 __mutex_lock_common kernel/locking/mutex.c:623 [inline]
 __mutex_lock+0xf8/0xf14 kernel/locking/mutex.c:821
 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874
 class_mutex_constructor include/linux/mutex.h:253 [inline]
 futex_pivot_pending+0x30/0xa4 kernel/futex/core.c:1789
 futex_hash_allocate+0x73c/0xc20 kernel/futex/core.c:1872
 futex_hash_prctl+0xd0/0x324 kernel/futex/core.c:2027
 __do_sys_prctl kernel/sys.c:2885 [inline]
 __se_sys_prctl kernel/sys.c:2534 [inline]
 __arm64_sys_prctl+0x9c0/0x14e8 kernel/sys.c:2534
 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline]
 invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49
 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121
 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140
 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:758
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:777
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:590
irq event stamp: 78
hardirqs last  enabled at (77): [<ffff800080492020>] vprintk_store+0x924/0xb94 kernel/printk/printk.c:2385
hardirqs last disabled at (78): [<ffff8000869055a8>] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:445
softirqs last  enabled at (54): [<ffff80008013c050>] local_bh_enable include/linux/bottom_half.h:33 [inline]
softirqs last  enabled at (54): [<ffff80008013c050>] put_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:251 [inline]
softirqs last  enabled at (54): [<ffff80008013c050>] fpsimd_restore_current_state+0x39c/0x9c8 arch/arm64/kernel/fpsimd.c:1797
softirqs last disabled at (52): [<ffff80008013bcf8>] local_bh_disable include/linux/bottom_half.h:20 [inline]
softirqs last disabled at (52): [<ffff80008013bcf8>] get_cpu_fpsimd_context arch/arm64/kernel/fpsimd.c:234 [inline]
softirqs last disabled at (52): [<ffff80008013bcf8>] fpsimd_restore_current_state+0x44/0x9c8 arch/arm64/kernel/fpsimd.c:1790
---[ end trace 0000000000000000 ]---

Crashes (75):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/11 16:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 16:25 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/18 16:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 1e72964b .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/16 20:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/16 06:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/15 16:57 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/15 03:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/14 18:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 746171ee .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/14 13:17 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 b13552fe .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/13 14:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 a9ede23c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/12 19:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 21d6ac051080 7ae4acc7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/12 07:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 f8d35649 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:59 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:37 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:27 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:16 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:06 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 15:03 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:58 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:56 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
2026/08/11 14:34 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci f9054278acf4 37a258dd .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in futex_pivot_pending
* Struck through repros no longer work on HEAD.