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Li RongQing e700f5d156 watchdog: softlockup: panic when lockup duration exceeds N thresholds 
The softlockup_panic sysctl is currently a binary option: panic
immediately or never panic on soft lockups.

Panicking on any soft lockup, regardless of duration, can be overly
aggressive for brief stalls that may be caused by legitimate operations. 
Conversely, never panicking may allow severe system hangs to persist
undetected.

Extend softlockup_panic to accept an integer threshold, allowing the
kernel to panic only when the normalized lockup duration exceeds N
watchdog threshold periods.  This provides finer-grained control to
distinguish between transient delays and persistent system failures.

The accepted values are:
- 0: Don't panic (unchanged)
- 1: Panic when duration >= 1 * threshold (20s default, original behavior)
- N > 1: Panic when duration >= N * threshold (e.g., 2 = 40s, 3 = 60s.)

The original behavior is preserved for values 0 and 1, maintaining full
backward compatibility while allowing systems to tolerate brief lockups
while still catching severe, persistent hangs.

[lirongqing@baidu.com: v2]
  Link: https://lkml.kernel.org/r/20251218074300.4080-1-lirongqing@baidu.com
Link: https://lkml.kernel.org/r/20251216074521.2796-1-lirongqing@baidu.com
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Yonghong Song <yonghong.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-01-20 19:44:20 -08:00
..
accel accel/amdxdna: Block running under a hypervisor 2025-12-15 13:00:03 -06:00
accessibility
acpi ACPI: PM: s2idle: Add module parameter for LPS0 constraints checking 2026-01-13 23:10:25 +01:00
amba soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
android rust_binder: remove spin_lock() in rust_shrink_free_page() 2025-12-29 11:34:16 +01:00
ata ata: libata: Print features also for ATAPI devices 2026-01-13 22:00:02 +09:00
atm kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
auxdisplay kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
base PM: runtime: Do not clear needs_force_resume with enabled runtime PM 2025-12-16 12:58:57 +01:00
bcma
block array_size.h: add ARRAY_END() 2026-01-20 19:44:19 -08:00
bluetooth Bluetooth: btusb: revert use of devm_kzalloc in btusb 2025-12-19 17:23:18 -05:00
bus kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
cache cache: Support cache maintenance for HiSilicon SoC Hydra Home Agent 2025-11-21 18:42:02 +00:00
cdrom
cdx
char kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
clk This pull request is entirely SoC clk drivers, not for lack of trying to modify 2025-12-08 09:38:52 +09:00
clocksource soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
comedi kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
connector
counter counter: 104-quad-8: Fix incorrect return value in IRQ handler 2025-12-22 20:03:23 +09:00
cpufreq cpufreq: dt-platdev: Fix creating device on OPPv1 platforms 2025-12-16 07:59:30 -06:00
cpuidle soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
crypto crypto: qat - fix duplicate restarting msg during AER error 2025-12-29 08:44:14 +08:00
cxl cxl: Check for invalid addresses returned from translation functions on errors 2026-01-13 08:30:40 -07:00
dax drivers/dax: add some missing kerneldoc comment fields for struct dev_dax 2026-01-14 22:16:26 -08:00
dca
devfreq PM / devfreq: Fix typo in DFSO_DOWNDIFFERENTIAL macro name 2025-11-26 13:58:59 +09:00
dibs dibs: Remove KMSG_COMPONENT macro 2025-11-27 18:11:43 -08:00
dio
dma dmaengine: apple-admac: Add "apple,t8103-admac" compatible 2026-01-11 22:12:49 +05:30
dma-buf VFIO updates for v6.19-rc1 2025-12-04 18:42:48 -08:00
dpll tools: ynl-gen: add regeneration comment 2025-11-25 19:20:42 -08:00
edac EDAC/x38: Fix a resource leak in x38_probe1() 2026-01-04 08:35:39 +01:00
eisa
extcon
firewire firewire: nosy: Fix dma_free_coherent() size 2025-12-26 22:04:03 +09:00
firmware kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
fpga
fsi
fwctl
gnss gnss: ubx: add support for the safeboot gpio 2025-11-20 16:44:04 +01:00
gpib staging: gpib: Clean-up commented-out code 2025-11-26 14:28:19 +01:00
gpio kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
gpu watchdog: softlockup: panic when lockup duration exceeds N thresholds 2026-01-20 19:44:20 -08:00
greybus greybus: gb-beagleplay: Fix timeout handling in bootloader functions 2025-11-26 14:40:59 +01:00
hid kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
hsi
hte
hv mshv: release mutex on region invalidation failure 2025-12-18 20:00:10 +00:00
hwmon kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
hwspinlock
hwtracing Char/Misc/IIO driver updates for 6.19-rc1 2025-12-06 18:34:24 -08:00
i2c i2c: imx-lpi2c: change to PIO mode in system-wide suspend/resume progress 2026-01-14 12:58:26 +01:00
i3c i3c: adi: Fix confusing cleanup.h syntax 2025-12-12 23:59:39 +01:00
idle
iio Char/Misc/IIO driver updates for 6.19-rc1 2025-12-06 18:34:24 -08:00
infiniband kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
input kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
interconnect interconnect: qcom: sm6350: enable QoS configuration 2025-11-19 16:03:12 +02:00
iommu iommu/sva: include mmu_notifier.h header 2026-01-14 22:16:25 -08:00
ipack
irqchip irqchip/riscv-imsic: Revert "Remove redundant irq_data lookups" 2026-01-13 09:51:46 +01:00
isdn
leds soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
macintosh soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
mailbox mailbox: th1520: fix clock imbalance on probe failure 2025-11-28 09:47:44 -06:00
mcb
md kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
media kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
memory soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
memstick
message
mfd MFD for v6.19 2025-12-04 15:18:33 -08:00
misc kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
mmc mmc: sdhci-esdhc-imx: add alternate ARCH_S32 dependency to Kconfig 2025-12-17 14:14:51 +01:00
most
mtd treewide: Update email address 2026-01-11 06:09:11 -10:00
mux mux: mmio: Add suspend and resume support 2025-11-26 15:09:30 +01:00
net kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
nfc nfc: pn533: Fix error code in pn533_acr122_poweron_rdr() 2025-12-11 01:40:00 -08:00
ntb
nubus
nvdimm NVDIMM changes for 6.19 2025-12-06 09:32:25 -08:00
nvme kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
nvmem kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
of of: fix reference count leak in of_alias_scan() 2026-01-17 10:20:43 -06:00
opp
parisc parisc: Set valid bit in high byte of 64‑bit physical address 2025-12-19 13:56:17 +01:00
parport
pci cxl fixes for v6.19-rc6 2026-01-16 13:09:28 -08:00
pcmcia
peci Char/Misc/IIO driver updates for 6.19-rc1 2025-12-06 18:34:24 -08:00
perf arm64 updates for 6.19: 2025-12-02 17:03:55 -08:00
phy phy: freescale: imx8m-pcie: assert phy reset during power on 2026-01-14 21:44:39 +05:30
pinctrl pinctrl: qcom: lpass-lpi: mark the GPIO controller as sleeping 2026-01-01 15:40:56 +01:00
platform kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
pmdomain pmdomain: imx: Fix reference count leak in imx_gpc_probe() 2025-12-29 11:41:09 +01:00
pnp kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
power soc: driver updates for 6.19 2025-12-05 17:29:04 -08:00
powercap powercap: intel_rapl: Fix possible recursive lock warning 2025-12-17 17:24:28 +01:00
pps printk changes for 6.19 2025-12-03 12:42:36 -08:00
ps3
ptp kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
pwm pwm: max7360: Populate missing .sizeof_wfhw in max7360_pwm_ops 2026-01-19 18:31:05 +01:00
rapidio
ras EFI updates for v6.19: 2025-12-04 17:10:08 -08:00
regulator regulator: fp9931: fix regulator node pointer 2025-12-24 11:31:29 +00:00
remoteproc remoteproc: qcom_q6v5_wcss: use optional reset for wcss_q6_bcr_reset 2025-11-29 15:20:23 -06:00
resctrl arm_mpam: Use non-atomic bitops when modifying feature bitmap 2026-01-16 12:04:20 +00:00
reset This pull request is entirely SoC clk drivers, not for lack of trying to modify 2025-12-08 09:38:52 +09:00
rpmsg rpmsg: glink: remove duplicate code for rpmsg device remove 2025-11-26 10:16:10 -06:00
rtc RTC for 6.19 2025-12-13 17:09:06 +12:00
s390 kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
sbus
scsi kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
sh
siox
slimbus Networking changes for 6.19. 2025-12-03 17:24:33 -08:00
soc bitmap updates for v6.19 2025-12-06 09:01:27 -08:00
soundwire soundwire fix for 6.19 2026-01-18 12:29:12 -08:00
spi spi: cadence-quadspi: Prevent indirect read 2025-12-23 15:18:22 +00:00
spmi
ssb
staging kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
target kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
tc
tee QCOMTEE fixes2 for v6.18 2025-11-21 21:27:20 +01:00
thermal thermal: core: Fix typo and indentation in comments 2025-12-15 12:47:39 +01:00
thunderbolt kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
tty kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
ufs kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
uio treewide: Update email address 2026-01-11 06:09:11 -10:00
usb kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
vdpa Significant patch series in this merge are as follows: 2025-12-05 13:52:43 -08:00
vfio vfio/xe: Fix use-after-free in xe_vfio_pci_alloc_file() 2025-12-28 12:42:46 -07:00
vhost vhost/vsock: improve RCU read sections around vhost_vsock_get() 2025-12-24 08:02:57 -05:00
video fbdev fixes & enhancements for 6.19-rc1: 2025-12-06 15:41:26 -08:00
virt virt: Fix Kconfig warning when selecting TSM without VIRT_DRIVERS 2025-12-04 17:34:16 -08:00
virtio virtio: clean up features qword/dword terms 2025-11-27 02:03:07 -05:00
w1
watchdog kernel.h: drop hex.h and update all hex.h users 2026-01-20 19:44:19 -08:00
xen ACPI: PCI: IRQ: Fix INTx GSIs signedness 2026-01-05 19:06:40 +01:00
zorro
Kconfig Staging driver updates for 6.19-rc1 2025-12-06 18:52:00 -08:00
Makefile Staging driver updates for 6.19-rc1 2025-12-06 18:52:00 -08:00