WARNING in __run_timer_base (2)

WARNING in __run_timer_base (2)

Status: auto-obsoleted due to no activity on 2026/06/06 18:20
Subsystems: kernel
Labels: prio:high
[Documentation on labels]
Reported-by: syzbot+b65655bc21a8355d65c8@syzkaller.appspotmail.com
First crash: 100d, last: 100d

▶ ▼ ✨ AI Jobs (2)

ID	Workflow	Result	Correct	Bug	Created	Started	Finished	Revision	Error
7a6d5cf5-c3ff-44fa-a6d1-06bc4266e8df	assessment-security	DenialOfService: ❌ Exploitable: ❌ FilesystemTrigger: ✅ NetworkTrigger: ✅ PeripheralTrigger: ✅ RemoteTrigger: ✅ Unprivileged: ✅ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ✅	❓	WARNING in __run_timer_base (2)	2026/05/31 06:45	2026/05/31 06:45	2026/05/31 07:46	6b4a844333e83556da95d61d7f207e7ef5cd4bc6
9e307823-3a2f-45bc-8e48-ca255a995005	assessment-security		💥	WARNING in __run_timer_base (2)	2026/05/14 14:29	2026/05/14 14:29	2026/05/14 14:30	6ccb967e465e832a7bfd7a116ad00d52a0923a5d	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: 19% (18321/93005) Updating files: 20% (18601/93005) Updating files: 21% (19532/93005) Updating files: 22% (20462/93005) Updating files: 23% (21392/93005) Updating files: 24% (22322/93005) Updating files: 25% (23252/93005) Updating files: 26% (24182/93005) Updating files: 27% (25112/93005) Updating files: 28% (26042/93005) Updating files: 29% (26972/93005) Updating files: 30% (27902/93005) Updating files: 31% (28832/93005) Updating files: 32% (29762/93005) error: unable to write file drivers/ata/ahci_imx.c error: unable to write file drivers/ata/ahci_mtk.c error: unable to write file drivers/ata/ahci_mvebu.c error: unable to write file drivers/ata/ahci_octeon.c error: unable to write file drivers/ata/ahci_platform.c Updating files: 33% (30692/93005) error: unable to write file drivers/ata/ahci_qoriq.c error: unable to write file drivers/ata/ahci_seattle.c error: unable to write file drivers/ata/ahci_st.c error: unable to write file drivers/ata/ahci_sunxi.c error: unable to write file drivers/ata/ahci_tegra.c error: unable to write file drivers/ata/ahci_xgene.c error: unable to write file drivers/ata/ata_generic.c error: unable to write file drivers/ata/ata_piix.c error: unable to write file drivers/ata/libahci.c error: unable to write file drivers/ata/libahci_platform.c error: unable to write file drivers/ata/libata-acpi.c error: unable to write file drivers/ata/libata-core.c error: unable to write file drivers/ata/libata-eh.c error: unable to write file drivers/ata/libata-pata-timings.c error: unable to write file drivers/ata/libata-pmp.c error: unable to write file drivers/ata/libata-sata.c error: unable to write file drivers/ata/libata-scsi.c error: unable to write file drivers/ata/libata-sff.c error: unable to write file drivers/ata/libata-trace.c error: unable to write file drivers/ata/libata-transport.c error: unable to write file drivers/ata/libata-transport.h error: unable to write file drivers/ata/libata-zpodd.c error: unable to write file drivers/ata/libata.h error: unable to write file drivers/ata/pata_acpi.c error: unable to write file drivers/ata/pata_ali.c error: unable to write file drivers/ata/pata_amd.c error: unable to write file drivers/ata/pata_arasan_cf.c error: unable to write file drivers/ata/pata_artop.c error: unable to write file drivers/ata/pata_atiixp.c error: unable to write file drivers/ata/pata_atp867x.c error: unable to write file drivers/ata/pata_buddha.c error: unable to write file drivers/ata/pata_cmd640.c error: unable to write file drivers/ata/pata_cmd64x.c error: unable to write file drivers/ata/pata_cs5520.c error: unable to write file drivers/ata/pata_cs5530.c error: unable to write file drivers/ata/pata_cs5535.c error: unable to write file drivers/ata/pata_cs5536.c error: unable to write file drivers/ata/pata_cypress.c error: unable to write file drivers/ata/pata_efar.c error: unable to write file drivers/ata/pata_ep93xx.c error: unable to write file drivers/ata/pata_falcon.c error: unable to write file drivers/ata/pata_ftide010.c error: unable to write file drivers/ata/pata_gayle.c error: unable to write file drivers/ata/pata_hpt366.c error: unable to write file drivers/ata/pata_hpt37x.c error: unable to write file drivers/ata/pata_hpt3x2n.c error: unable to write file drivers/ata/pata_hpt3x3.c error: unable to write file drivers/ata/pata_icside.c error: unable to write file drivers/ata/pata_imx.c error: unable to write file drivers/ata/pata_isapnp.c error: unable to write file drivers/ata/pata_it8213.c error: unable to write file drivers/ata/pata_it821x.c error: unable to write file drivers/ata/pata_ixp4xx_cf.c error: unable to write file drivers/ata/pata_jmicron.c error: unable to write file drivers/ata/pata_legacy.c error: unable to write file drivers/ata/pata_macio.c error: unable to write file drivers/ata/pata_marvell.c error: unable to write file drivers/ata/pata_m

▶ ▼ Discussions (1)

Title	Replies (including bot)	Last reply
[syzbot] [kernel?] WARNING in __run_timer_base (2)	0 (1)	2026/03/02 18:23

▶ ▼ Similar bugs (1)

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING in __run_timer_base kernel	-1				11	212d	273d	0/29	auto-obsoleted due to no activity on 2026/02/05 21:57

Sample crash report:

------------[ cut here ]------------
!fn
WARNING: kernel/time/timer.c:1786 at expire_timers kernel/time/timer.c:1786 [inline], CPU#0: ktimers/0/16
WARNING: kernel/time/timer.c:1786 at __run_timers kernel/time/timer.c:2373 [inline], CPU#0: ktimers/0/16
WARNING: kernel/time/timer.c:1786 at __run_timer_base+0x7d2/0x9f0 kernel/time/timer.c:2385, CPU#0: ktimers/0/16
Modules linked in:
CPU: 0 UID: 0 PID: 16 Comm: ktimers/0 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:expire_timers kernel/time/timer.c:1786 [inline]
RIP: 0010:__run_timers kernel/time/timer.c:2373 [inline]
RIP: 0010:__run_timer_base+0x7d2/0x9f0 kernel/time/timer.c:2385
Code: 27 4d 85 e4 74 7d e8 4d ee 13 00 e9 48 fe ff ff e8 43 ee 13 00 48 8b 5c 24 30 43 80 7c 35 00 00 75 d4 eb da e8 2f ee 13 00 90 <0f> 0b 90 48 8b 44 24 48 42 80 3c 30 00 48 8b 5c 24 30 74 a9 48 89
RSP: 0018:ffffc90000157b40 EFLAGS: 00010046
RAX: ffffffff81b064e1 RBX: 0000000000000000 RCX: ffff88801caa8000
RDX: 0000000000000100 RSI: 0000000000000000 RDI: 0000000000000100
RBP: ffffc90000157cb8 R08: 0000000000000000 R09: 0000000000000100
R10: dffffc0000000000 R11: fffffbfff1ed4517 R12: ffff88803c019f38
R13: 1ffff9200002af81 R14: dffffc0000000000 R15: ffffc90000157c08
FS:  0000000000000000(0000) GS:ffff888126343000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f718355de06 CR3: 0000000059208000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 run_timer_base kernel/time/timer.c:2394 [inline]
 run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404
 handle_softirqs+0x1de/0x6f0 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 run_ktimerd+0x69/0x100 kernel/softirq.c:1138
 smpboot_thread_fn+0x541/0xa50 kernel/smpboot.c:160
 kthread+0x388/0x470 kernel/kthread.c:467
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2026/02/26 18:19	upstream	f4d0ec0aa20d	ffa54287	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci-upstream-kasan-gce-smack-root	WARNING in __run_timer_base

* ~~Struck through~~ repros no longer work on HEAD.