WARNING in ct_kernel_exit

Status: upstream: reported C repro on 2026/07/28 16:16
Subsystems: pm
Labels: prio:low
[Documentation on labels]
Reported-by: syzbot+79883955da3a62652a80@syzkaller.appspotmail.com
First crash: 4d12h, last: 53m
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
2fd9bf9f assessment-security DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ❌ VMGuestTrigger: ❌ VMHostTrigger: ❌ WARNING in ct_kernel_exit 2026/07/25 00:56 2026/07/25 00:56 2026/07/25 01:50 1bdb5c57

			
		
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [pm?] WARNING in ct_kernel_exit 0 (1) 2026/07/28 16:16

Sample crash report:
vhci_hcd vhci_hcd.1: suspend vhci_hcd
vhci_hcd vhci_hcd.0: suspend vhci_hcd
Disabling non-boot CPUs ...
psci: CPU1 killed (polled 0 ms)
------------[ cut here ]------------
WARNING: kernel/context_tracking.c:120 at ct_kernel_exit+0x1b4/0x1f4 kernel/context_tracking.c:118, CPU#0: syz.0.17/4926
Modules linked in:
CPU: 0 UID: 0 PID: 4926 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 634003c5 (nZCv DAIF +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : ct_kernel_exit+0x1b4/0x1f4 kernel/context_tracking.c:118
lr : instrument_atomic_read include/linux/instrumented.h:82 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
lr : ct_rcu_watching include/linux/context_tracking_state.h:91 [inline]
lr : ct_kernel_exit+0x13c/0x1f4 kernel/context_tracking.c:119
sp : ffff800097a375f0
x29: ffff800097a375f0 x28: dfff800000000000 x27: ffff800097a37660
x26: 00000000000000c0 x25: ffff700012f46ecc x24: ffff800088abf998
x23: ffff800088b0b6a0 x22: ffff0001ade38998 x21: ffff0001ade38998
x20: 0000000000000000 x19: 0000000000000005 x18: 00000000ffffffff
x17: ffff80008a791000 x16: 0000000000000005 x15: ffff80008a31ada0
x14: 0000000000000000 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: ffff600035bc7135 x9 : dfff800000000000
x8 : 0000000000000040 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000008 x3 : ffff8000868e6858
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 ct_kernel_exit+0x1b4/0x1f4 kernel/context_tracking.c:118 (P)
 ct_idle_enter+0x24/0x38 kernel/context_tracking.c:299
 ct_cpuidle_enter include/linux/cpuidle.h:134 [inline]
 cpu_suspend+0x264/0x474 arch/arm64/kernel/suspend.c:140
 psci_system_suspend_enter+0x4c/0x80 drivers/firmware/psci/psci.c:544
 suspend_enter kernel/power/suspend.c:468 [inline]
 suspend_devices_and_enter+0x88c/0xd0c kernel/power/suspend.c:533
 enter_state kernel/power/suspend.c:618 [inline]
 pm_suspend+0x498/0x698 kernel/power/suspend.c:644
 state_store+0x14c/0x1fc kernel/power/main.c:819
 kobj_attr_store+0x6c/0x90 lib/kobject.c:840
 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:747
 __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:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 56758
hardirqs last  enabled at (56757): [<ffff80008690522c>] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:187 [inline]
hardirqs last  enabled at (56757): [<ffff80008690522c>] _raw_spin_unlock_irq+0x30/0x80 kernel/locking/spinlock.c:206
hardirqs last disabled at (56758): [<ffff800080473cc0>] arch_suspend_disable_irqs+0x34/0x4c kernel/power/suspend.c:403
softirqs last  enabled at (55516): [<ffff80008030ff18>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last  enabled at (55516): [<ffff80008030ff18>] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650
softirqs last disabled at (55511): [<ffff8000800204c0>] __do_softirq+0x14/0x20 kernel/softirq.c:656
---[ end trace 0000000000000000 ]---
------------[ cut here ]------------
WARNING: kernel/context_tracking.c:165 at ct_kernel_enter+0x138/0x170 kernel/context_tracking.c:150, CPU#0: syz.0.17/4926
Modules linked in:
CPU: 0 UID: 0 PID: 4926 Comm: syz.0.17 Tainted: G        W           syzkaller #0 PREEMPT 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/02/2026
pstate: 600003c5 (nZCv DAIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : ct_kernel_enter+0x138/0x170 kernel/context_tracking.c:150
lr : instrument_atomic_read include/linux/instrumented.h:82 [inline]
lr : atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
lr : ct_rcu_watching include/linux/context_tracking_state.h:91 [inline]
lr : ct_kernel_enter+0xc8/0x170 kernel/context_tracking.c:164
sp : ffff800097a375e0
x29: ffff800097a375e0 x28: dfff800000000000 x27: ffff800097a37660
x26: 00000000000000c0 x25: ffff700012f46ecc x24: 0000000100000000
x23: ffff800088b0b6a0 x22: ffff800088abf998 x21: ffff0001ade38998
x20: ffff0001ade38998 x19: 0000000000000000 x18: 00000000ffffffff
x17: 000000040044ffff x16: 041000f5b5503510 x15: 0000000000000000
x14: ffff0000ca88ba80 x13: 0000000000000001 x12: 0000000000000000
x11: 0000000000000000 x10: ffff600035bc7135 x9 : dfff800000000000
x8 : 0000000000000040 x7 : 0000000000000000 x6 : 000000000000003f
x5 : 0000000000000040 x4 : 0000000000000000 x3 : ffff8000868e6a20
x2 : 0000000000000000 x1 : 0000000000000004 x0 : 0000000000000001
Call trace:
 ct_kernel_enter+0x138/0x170 kernel/context_tracking.c:150 (P)
 ct_idle_exit+0x24/0x48 kernel/context_tracking.c:317
 ct_cpuidle_exit include/linux/cpuidle.h:144 [inline]
 cpu_suspend+0x2dc/0x474 arch/arm64/kernel/suspend.c:158
 psci_system_suspend_enter+0x4c/0x80 drivers/firmware/psci/psci.c:544
 suspend_enter kernel/power/suspend.c:468 [inline]
 suspend_devices_and_enter+0x88c/0xd0c kernel/power/suspend.c:533
 enter_state kernel/power/suspend.c:618 [inline]
 pm_suspend+0x498/0x698 kernel/power/suspend.c:644
 state_store+0x14c/0x1fc kernel/power/main.c:819
 kobj_attr_store+0x6c/0x90 lib/kobject.c:840
 sysfs_kf_write+0xe0/0x108 fs/sysfs/file.c:145
 kernfs_fop_write_iter+0x260/0x3b8 fs/kernfs/file.c:345
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x51c/0xa0c fs/read_write.c:687
 ksys_write+0x12c/0x228 fs/read_write.c:739
 __do_sys_write fs/read_write.c:750 [inline]
 __se_sys_write fs/read_write.c:747 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:747
 __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:736
 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755
 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594
irq event stamp: 56760
hardirqs last  enabled at (56759): [<ffff800084649440>] psci_system_suspend_enter+0x4c/0x80 drivers/firmware/psci/psci.c:544
hardirqs last disabled at (56760): [<ffff800084649440>] psci_system_suspend_enter+0x4c/0x80 drivers/firmware/psci/psci.c:544
softirqs last  enabled at (55516): [<ffff80008030ff18>] softirq_handle_end kernel/softirq.c:468 [inline]
softirqs last  enabled at (55516): [<ffff80008030ff18>] handle_softirqs+0xc28/0xd98 kernel/softirq.c:650
softirqs last disabled at (55511): [<ffff8000800204c0>] __do_softirq+0x14/0x20 kernel/softirq.c:656
---[ end trace 0000000000000000 ]---
Enabling non-boot CPUs ...
CPU1 is up
OOM killer enabled.
Restarting tasks: Starting
Restarting tasks: Done
random: crng reseeded on system resumption
PM: suspend exit

Crashes (33):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/07/29 03:35 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 19622d9d .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 09:46 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 08:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 06:38 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 22:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 21:39 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 20:55 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 20:13 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 19:29 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 18:21 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 16:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 15:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 15:28 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 19622d9d .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 12:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 11:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 11:53 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 08:22 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/28 05:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 45ae1df4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 23:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 23:31 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 23:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 18:40 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 18:30 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 4cb2b096 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 13:44 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/27 12:26 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/26 16:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/26 16:52 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 365f9c7a6b81 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/26 14:08 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/26 13:47 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/26 12:33 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 492bab15 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/25 01:32 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 16:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
2026/07/24 16:12 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci b66b0005b6ce 05b26a28 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 WARNING in ct_kernel_exit
* Struck through repros no longer work on HEAD.