Message-ID: <aJBnf738fPEmVqGo@hyeyoo>
Date: Mon, 4 Aug 2025 16:55:43 +0900
From: Harry Yoo <harry.yoo@...cle.com>
To: Naresh Kamboju <naresh.kamboju@...aro.org>
Cc: Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linux-mm <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org,
        Linux Regressions <regressions@...ts.linux.dev>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Anders Roxell <anders.roxell@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Paul E. McKenney" <paulmck@...nel.org>, Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Ben Copeland <benjamin.copeland@...aro.org>
Subject: Re: next-20250729: PREEMPT_RT: rock Pi 4b Internal error Oops
 kmem_cache_alloc_bulk_noprof - kernel locking rtmutex.c at
 __rt_mutex_slowlock_locked

On Sat, Aug 02, 2025 at 03:45:51PM +0530, Naresh Kamboju wrote:
> Regressions found while validating Linux next on the Radxa Rock Pi 4B
> platform, we observed kernel crashes and deadlock warnings when running LTP
> syscall and controller tests under specific PREEMPT_RT configurations.
> These issues appear to be regressions introduced in next-20250729.
> 
> * CONFIG_EXPERT=y
> * CONFIG_PREEMPT_RT=y
> * CONFIG_LAZY_PREEMPT=y
> 
> Regression Analysis:
> - New regression? Yes
> - Reproducibility? Intermittent
> 
> First seen on the next-20250729
> Good: next-20250728
> Bad: next-20250729 and next-20250801
> 
> Test regression: next-20250729 rock Pi 4b Internal error Oops
> kmem_cache_alloc_bulk_noprof
> Test regression: next-20250729 rock Pi 4b WARNING kernel locking
> rtmutex.c at __rt_mutex_slowlock_locked
> Test regression: next-20250729 rock Pi 4b WARNING kernel rcu
> tree_plugin.h at rcu_note_context_switch
> 
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

Thanks for the report, Naresh!

based on the stack trace, I think there might be a use-after-free or
buffer overflow bug that could trigger this.

Could you please try to reproduce it with KASAN enabled to confirm that
it is the case?
 
> ## Test log
> [  527.570253] Unable to handle kernel paging request at virtual
> address 003f0020f94020a1
> [  527.570274] Mem abort info:
> [  527.570277]   ESR = 0x0000000096000004
> [  527.570282]   EC = 0x25: DABT (current EL), IL = 32 bits
> [  527.570288]   SET = 0, FnV = 0
> [  527.570292]   EA = 0, S1PTW = 0
> [  527.570297]   FSC = 0x04: level 0 translation fault
> [  527.570302] Data abort info:
> [  527.570305]   ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
> [  527.570310]   CM = 0, WnR = 0, TnD = 0, TagAccess = 0
> [  527.570316]   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
> [  527.570322] [003f0020f94020a1] address between user and kernel address ranges
> [  527.570330] Internal error: Oops: 0000000096000004 [#1]  SMP
> [  527.570336] Modules linked in: brcmfmac rockchip_dfi brcmutil
> cfg80211 snd_soc_hdmi_codec dw_hdmi_i2s_audio dw_hdmi_cec
> snd_soc_simple_card snd_soc_audio_graph_card hci_uart
> snd_soc_rockchip_i2s snd_soc_es8316 snd_soc_spdif_tx
> snd_soc_simple_card_utils btqca rtc_rk808 rockchipdrm btbcm
> snd_soc_core dw_hdmi_qp bluetooth snd_compress reset_gpio analogix_dp
> snd_pcm_dmaengine panfrost hantro_vpu dw_mipi_dsi rfkill rockchip_rga
> drm_shmem_helper drm_dp_aux_bus snd_pcm gpu_sched dw_hdmi pwrseq_core
> videobuf2_dma_sg v4l2_vp9 snd_timer drm_display_helper v4l2_h264
> v4l2_jpeg phy_rockchip_pcie snd v4l2_mem2mem cec videobuf2_dma_contig
> soundcore videobuf2_memops drm_client_lib videobuf2_v4l2
> drm_dma_helper videobuf2_common rockchip_saradc drm_kms_helper
> industrialio_triggered_buffer kfifo_buf rockchip_thermal
> pcie_rockchip_host coresight_cpu_debug fuse drm backlight
> [  527.570493] CPU: 3 UID: 0 PID: 34254 Comm: mkdir Not tainted
> 6.16.0-next-20250801 #1 PREEMPT_RT
> [  527.570502] Hardware name: Radxa ROCK Pi 4B (DT)
> [  527.570506] pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  527.570512] pc : kmem_cache_alloc_bulk_noprof (mm/slub.c:5343
> (discriminator 1) mm/slub.c:5403 (discriminator 1))
> [  527.570527] lr : kmem_cache_alloc_bulk_noprof
> (include/linux/atomic/atomic-arch-fallback.h:457
> include/linux/atomic/atomic-instrumented.h:33
> include/linux/kfence.h:127 mm/slub.c:5307 mm/slub.c:5403)
> [  527.570533] sp : ffff80008e24b8f0
> [  527.570536] x29: ffff80008e24b930 x28: 00ff000000584610 x27: ffff800082b30538
> [  527.570545] x26: ffff8000816b64dc x25: 0000000000000cc0 x24: 0000000000000000
> [  527.570554] x23: 0000000000000004 x22: ffff0000f7579d20 x21: 0000000000000001
> [  527.570563] x20: 0000000000000001 x19: ffff000000405b00 x18: ffff80008e24bcd0
> [  527.570572] x17: 0000000000000000 x16: ffff800081e18420 x15: 0000ffffa2670fff
> [  527.570582] x14: 0000000000000000 x13: 1fffe000017942e1 x12: 0000ffffa2470fff
> [  527.570591] x11: ffff00000bca1708 x10: 0000000000000001 x9 : ffff8000816e41a4
> [  527.570600] x8 : ffff80008e24b850 x7 : fefefefefefefefe x6 : ffff800082b30000
> [  527.570608] x5 : d63f0020f9402021 x4 : ffff0000f7579d58 x3 : 0000000000000000
> [  527.570617] x2 : 0000000000000000 x1 : 0000000000000100 x0 : 0000000000000080
> [  527.570627] Call trace:
> [  527.570631] kmem_cache_alloc_bulk_noprof (mm/slub.c:5343

It crashes in get_freepointer() because a bad pointer is passed to it.

I think it is reasonable to suspect that the freelist chain is corrupt
due to a use-after-free or buffer overflow (either in maple tree code,
or something else that shares the cache with maple tree nodes).

> (discriminator 1) mm/slub.c:5403 (discriminator 1)) (P)
> [  527.570639] mas_alloc_nodes (lib/maple_tree.c:1278)
> [  527.570651] mas_node_count_gfp (lib/maple_tree.c:1339)
> [  527.570661] mas_preallocate (lib/maple_tree.c:5538 (discriminator 1))
> [  527.570667] __split_vma (mm/vma.c:528 (discriminator 1))
> [  527.570677] vma_modify (mm/vma.c:1633)
> [  527.570685] vma_modify_flags (mm/vma.c:1650)
> [  527.570694] mprotect_fixup (mm/mprotect.c:819)
> [  527.570704] do_mprotect_pkey (mm/mprotect.c:993)
> [  527.570713] __arm64_sys_mprotect (mm/mprotect.c:1011)
> [  527.570722] invoke_syscall (arch/arm64/include/asm/current.h:19
> arch/arm64/kernel/syscall.c:54)
> [  527.570731] el0_svc_common.constprop.0
> (include/linux/thread_info.h:135 (discriminator 2)
> arch/arm64/kernel/syscall.c:140 (discriminator 2))
> [  527.570737] do_el0_svc (arch/arm64/kernel/syscall.c:152)
> [  527.570744] el0_svc (arch/arm64/include/asm/irqflags.h:82
> (discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator
> 1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1)
> arch/arm64/kernel/entry-common.c:169 (discriminator 1)
> arch/arm64/kernel/entry-common.c:182 (discriminator 1)
> arch/arm64/kernel/entry-common.c:880 (discriminator 1))
> [  527.570752] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:899)
> [  527.570760] el0t_64_sync (arch/arm64/kernel/entry.S:596)
> [ 527.570772] Code: 1400000c f94002c5 b4000aa5 b9402a60 (f86068a0)
> All code
> ========
>    0: 1400000c b 0x30
>    4: f94002c5 ldr x5, [x22]
>    8: b4000aa5 cbz x5, 0x15c
>    c: b9402a60 ldr w0, [x19, #40]
>   10:* f86068a0 ldr x0, [x5, x0] <-- trapping instruction
> 
> Code starting with the faulting instruction
> ===========================================
>    0: f86068a0 ldr x0, [x5, x0]
> [  527.570778] ---[ end trace 0000000000000000 ]---
> [  527.570800] ------------[ cut here ]------------
> [  527.570803] rtmutex deadlock detected
> [  527.570827] WARNING: kernel/locking/rtmutex.c:1674 at
> __rt_mutex_slowlock_locked.constprop.0+0x800/0x8e0, CPU#3: mkdir/34254
> [  527.570841] Modules linked in: brcmfmac rockchip_dfi brcmutil
> cfg80211 snd_soc_hdmi_codec dw_hdmi_i2s_audio dw_hdmi_cec
> snd_soc_simple_card snd_soc_audio_graph_card hci_uart
> snd_soc_rockchip_i2s snd_soc_es8316 snd_soc_spdif_tx
> snd_soc_simple_card_utils btqca rtc_rk808 rockchipdrm btbcm
> snd_soc_core dw_hdmi_qp bluetooth snd_compress reset_gpio analogix_dp
> snd_pcm_dmaengine panfrost hantro_vpu dw_mipi_dsi rfkill rockchip_rga
> drm_shmem_helper drm_dp_aux_bus snd_pcm gpu_sched dw_hdmi pwrseq_core
> videobuf2_dma_sg v4l2_vp9 snd_timer drm_display_helper v4l2_h264
> v4l2_jpeg phy_rockchip_pcie snd v4l2_mem2mem cec videobuf2_dma_contig
> soundcore videobuf2_memops drm_client_lib videobuf2_v4l2
> drm_dma_helper videobuf2_common rockchip_saradc drm_kms_helper
> industrialio_triggered_buffer kfifo_buf rockchip_thermal
> pcie_rockchip_host coresight_cpu_debug fuse drm backlight
> [  527.570965] CPU: 3 UID: 0 PID: 34254 Comm: mkdir Tainted: G      D
>            6.16.0-next-20250801 #1 PREEMPT_RT
> [  527.570973] Tainted: [D]=DIE
> [  527.570976] Hardware name: Radxa ROCK Pi 4B (DT)
> [  527.570979] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  527.570985] pc : __rt_mutex_slowlock_locked.constprop.0
> (kernel/locking/rtmutex.c:1674 (discriminator 1)
> kernel/locking/rtmutex.c:1734 (discriminator 1)
> kernel/locking/rtmutex.c:1760 (discriminator 1))
> [  527.570993] lr : __rt_mutex_slowlock_locked.constprop.0
> (kernel/locking/rtmutex.c:1674 (discriminator 1)
> kernel/locking/rtmutex.c:1734 (discriminator 1)
> kernel/locking/rtmutex.c:1760 (discriminator 1))
> [  527.571001] sp : ffff80008e24b2e0
> [  527.571004] x29: ffff80008e24b370 x28: ffff000007c1a600 x27: ffff000007c1a601
> [  527.571013] x26: ffff80008e24b318 x25: ffff000007c1a600 x24: 00000000ffffffdd
> [  527.571023] x23: 00000000ffffffdd x22: 0000000000000001 x21: ffff000007c1a601
> [  527.571032] x20: ffff80008e24b2f0 x19: ffff00001d756e30 x18: 0000000000000000
> [  527.571041] x17: 65676e6172207373 x16: 6572646461206c65 x15: 0000000000000000
> [  527.571050] x14: 0000000000000020 x13: 0a64657463657465 x12: 64206b636f6c6461
> [  527.571059] x11: 656820747563205b x10: ffff800082adac08 x9 : ffff80008015020c
> [  527.571068] x8 : ffff80008e24af08 x7 : 0000000000000001 x6 : ffff800082a5e000
> [  527.571077] x5 : ffff000007c1a600 x4 : 0000000000000000 x3 : 0000000000000027
> [  527.571086] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000007c1a600
> [  527.571094] Call trace:
> [  527.571097] __rt_mutex_slowlock_locked.constprop.0
> (kernel/locking/rtmutex.c:1674 (discriminator 1)
> kernel/locking/rtmutex.c:1734 (discriminator 1)
> kernel/locking/rtmutex.c:1760 (discriminator 1)) (P)
> [  527.571107] __rwbase_read_lock (kernel/locking/rwbase_rt.c:114)
> [  527.571117] down_read (kernel/locking/rwsem.c:1540)
> [  527.571126] acct_collect (arch/arm64/include/asm/jump_label.h:36
> include/linux/mmap_lock.h:41 include/linux/mmap_lock.h:454
> kernel/acct.c:597)
> [  527.571135] do_exit (kernel/exit.c:932)
> [  527.571143] make_task_dead
> (arch/arm64/include/asm/atomic_ll_sc.h:95 (discriminator 2)
> arch/arm64/include/asm/atomic.h:52 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:564 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:1020 (discriminator 2)
> include/linux/atomic/atomic-instrumented.h:454 (discriminator 2)
> kernel/exit.c:1049 (discriminator 2))
> [  527.571150] die (arch/arm64/kernel/traps.c:231)
> [  527.571157] die_kernel_fault (arch/arm64/mm/fault.c:313)
> [  527.571167] __do_kernel_fault (arch/arm64/mm/fault.c:375 (discriminator 5))
> [  527.571177] do_bad_area (arch/arm64/mm/fault.c:482)
> [  527.571186] do_translation_fault (arch/arm64/mm/fault.c:792)
> [  527.571195] do_mem_abort (arch/arm64/mm/fault.c:929 (discriminator 1))
> [  527.571204] el1_abort (arch/arm64/include/asm/daifflags.h:28
> arch/arm64/kernel/entry-common.c:482)
> [  527.571210] el1h_64_sync_handler (arch/arm64/kernel/entry-common.c:637)
> [  527.571218] el1h_64_sync (arch/arm64/kernel/entry.S:591)

The deadlock wouldn't have been triggered if it didn't crash in SLUB, so
this looks rather irrelevant.

-- 
Cheers,
Harry / Hyeonggon

> [  527.571225] kmem_cache_alloc_bulk_noprof (mm/slub.c:5343
> (discriminator 1) mm/slub.c:5403 (discriminator 1)) (P)
> [  527.571232] mas_alloc_nodes (lib/maple_tree.c:1278)
> [  527.571241] mas_node_count_gfp (lib/maple_tree.c:1339)
> [  527.571251] mas_preallocate (lib/maple_tree.c:5538 (discriminator 1))
> [  527.571257] __split_vma (mm/vma.c:528 (discriminator 1))
> [  527.571265] vma_modify (mm/vma.c:1633)
> [  527.571273] vma_modify_flags (mm/vma.c:1650)
> [  527.571282] mprotect_fixup (mm/mprotect.c:819)
> [  527.571290] do_mprotect_pkey (mm/mprotect.c:993)
> [  527.571299] __arm64_sys_mprotect (mm/mprotect.c:1011)
> [  527.571308] invoke_syscall (arch/arm64/include/asm/current.h:19
> arch/arm64/kernel/syscall.c:54)
> [  527.571314] el0_svc_common.constprop.0
> (include/linux/thread_info.h:135 (discriminator 2)
> arch/arm64/kernel/syscall.c:140 (discriminator 2))
> [  527.571321] do_el0_svc (arch/arm64/kernel/syscall.c:152)
> [  527.571327] el0_svc (arch/arm64/include/asm/irqflags.h:82
> (discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator
> 1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1)
> arch/arm64/kernel/entry-common.c:169 (discriminator 1)
> arch/arm64/kernel/entry-common.c:182 (discriminator 1)
> arch/arm64/kernel/entry-common.c:880 (discriminator 1))
> [  527.571334] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:899)
> [  527.571341] el0t_64_sync (arch/arm64/kernel/entry.S:596)
> [  527.571349] ---[ end trace 0000000000000000 ]---
> [  527.571354] ------------[ cut here ]------------
> [  527.571356] Voluntary context switch within RCU read-side critical section!
> [  527.571372] WARNING: kernel/rcu/tree_plugin.h:332 at
> rcu_note_context_switch+0x4ec/0x538, CPU#3: mkdir/34254
> [  527.571383] Modules linked in: brcmfmac rockchip_dfi brcmutil
> cfg80211 snd_soc_hdmi_codec dw_hdmi_i2s_audio dw_hdmi_cec
> snd_soc_simple_card snd_soc_audio_graph_card hci_uart
> snd_soc_rockchip_i2s snd_soc_es8316 snd_soc_spdif_tx
> snd_soc_simple_card_utils btqca rtc_rk808 rockchipdrm btbcm
> snd_soc_core dw_hdmi_qp bluetooth snd_compress reset_gpio analogix_dp
> snd_pcm_dmaengine panfrost hantro_vpu dw_mipi_dsi rfkill rockchip_rga
> drm_shmem_helper drm_dp_aux_bus snd_pcm gpu_sched dw_hdmi pwrseq_core
> videobuf2_dma_sg v4l2_vp9 snd_timer drm_display_helper v4l2_h264
> v4l2_jpeg phy_rockchip_pcie snd v4l2_mem2mem cec videobuf2_dma_contig
> soundcore videobuf2_memops drm_client_lib videobuf2_v4l2
> drm_dma_helper videobuf2_common rockchip_saradc drm_kms_helper
> industrialio_triggered_buffer kfifo_buf rockchip_thermal
> pcie_rockchip_host coresight_cpu_debug fuse drm backlight
> [  527.571503] CPU: 3 UID: 0 PID: 34254 Comm: mkdir Tainted: G      D
> W           6.16.0-next-20250801 #1 PREEMPT_RT
> [  527.571512] Tainted: [D]=DIE, [W]=WARN
> [  527.571514] Hardware name: Radxa ROCK Pi 4B (DT)
> [  527.571517] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> [  527.571523] pc : rcu_note_context_switch
> (kernel/rcu/tree_plugin.h:332 (discriminator 1))
> [  527.571529] lr : rcu_note_context_switch
> (kernel/rcu/tree_plugin.h:332 (discriminator 1))
> [  527.571535] sp : ffff80008e24b1e0
> [  527.571538] x29: ffff80008e24b1e0 x28: ffff000007c1a600 x27: ffff000007c1a601
> [  527.571548] x26: 0000000000000000 x25: ffff000007c1a600 x24: ffff800082a60368
> [  527.571557] x23: 0000000000000000 x22: ffff000007c1a600 x21: ffff800083125260
> [  527.571566] x20: 0000000000000000 x19: ffff0000f7576080 x18: 0000000000000000
> [  527.571575] x17: 65676e6172207373 x16: 6572646461206c65 x15: 0000000000000000
> [  527.571583] x14: 0000000000000020 x13: 216e6f6974636573 x12: 206c616369746972
> [  527.571593] x11: 6320656469732d64 x10: 6165722055435220 x9 : ffff80008015020c
> [  527.571602] x8 : 6863746977732074 x7 : 7865746e6f632079 x6 : 7261746e756c6f56
> [  527.571611] x5 : ffff80008317146f x4 : 0000000000000000 x3 : 0000000000000027
> [  527.571619] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff000007c1a600
> [  527.571628] Call trace:
> [  527.571630] rcu_note_context_switch (kernel/rcu/tree_plugin.h:332
> (discriminator 1)) (P)
> [  527.571638] __schedule (kernel/sched/core.c:634
> kernel/sched/sched.h:1519 kernel/sched/sched.h:1841
> kernel/sched/core.c:6865)
> [  527.571647] rt_mutex_schedule (kernel/sched/core.c:7044
> kernel/sched/core.c:7339)
> [  527.571655] __rt_mutex_slowlock_locked.constprop.0
> (kernel/locking/rtmutex.c:1676 kernel/locking/rtmutex.c:1734
> kernel/locking/rtmutex.c:1760)
> [  527.571665] __rwbase_read_lock (kernel/locking/rwbase_rt.c:114)
> [  527.571674] down_read (kernel/locking/rwsem.c:1540)
> [  527.571683] acct_collect (arch/arm64/include/asm/jump_label.h:36
> include/linux/mmap_lock.h:41 include/linux/mmap_lock.h:454
> kernel/acct.c:597)
> [  527.571690] do_exit (kernel/exit.c:932)
> [  527.571696] make_task_dead
> (arch/arm64/include/asm/atomic_ll_sc.h:95 (discriminator 2)
> arch/arm64/include/asm/atomic.h:52 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:564 (discriminator 2)
> include/linux/atomic/atomic-arch-fallback.h:1020 (discriminator 2)
> include/linux/atomic/atomic-instrumented.h:454 (discriminator 2)
> kernel/exit.c:1049 (discriminator 2))
> [  527.571703] die (arch/arm64/kernel/traps.c:231)
> [  527.571710] die_kernel_fault (arch/arm64/mm/fault.c:313)
> [  527.571719] __do_kernel_fault (arch/arm64/mm/fault.c:375 (discriminator 5))
> [  527.571729] do_bad_area (arch/arm64/mm/fault.c:482)
> [  527.571738] do_translation_fault (arch/arm64/mm/fault.c:792)
> [  527.571746] do_mem_abort (arch/arm64/mm/fault.c:929 (discriminator 1))
> [  527.571755] el1_abort (arch/arm64/include/asm/daifflags.h:28
> arch/arm64/kernel/entry-common.c:482)
> [  527.571761] el1h_64_sync_handler (arch/arm64/kernel/entry-common.c:637)
> [  527.571769] el1h_64_sync (arch/arm64/kernel/entry.S:591)
> [  527.571775] kmem_cache_alloc_bulk_noprof (mm/slub.c:5343
> (discriminator 1) mm/slub.c:5403 (discriminator 1)) (P)
> [  527.571782] mas_alloc_nodes (lib/maple_tree.c:1278)
> [  527.571792] mas_node_count_gfp (lib/maple_tree.c:1339)
> [  527.571802] mas_preallocate (lib/maple_tree.c:5538 (discriminator 1))
> [  527.571808] __split_vma (mm/vma.c:528 (discriminator 1))
> [  527.571816] vma_modify (mm/vma.c:1633)
> [  527.571824] vma_modify_flags (mm/vma.c:1650)
> [  527.571833] mprotect_fixup (mm/mprotect.c:819)
> [  527.571842] do_mprotect_pkey (mm/mprotect.c:993)
> [  527.571850] __arm64_sys_mprotect (mm/mprotect.c:1011)
> [  527.571859] invoke_syscall (arch/arm64/include/asm/current.h:19
> arch/arm64/kernel/syscall.c:54)
> [  527.571866] el0_svc_common.constprop.0
> (include/linux/thread_info.h:135 (discriminator 2)
> arch/arm64/kernel/syscall.c:140 (discriminator 2))
> [  527.571872] do_el0_svc (arch/arm64/kernel/syscall.c:152)
> [  527.571878] el0_svc (arch/arm64/include/asm/irqflags.h:82
> (discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator
> 1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1)
> arch/arm64/kernel/entry-common.c:169 (discriminator 1)
> arch/arm64/kernel/entry-common.c:182 (discriminator 1)
> arch/arm64/kernel/entry-common.c:880 (discriminator 1))
> [  527.571885] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:899)
> [  527.571893] el0t_64_sync (arch/arm64/kernel/entry.S:596)
> [  527.571900] ---[ end trace 0000000000000000 ]---
> [  540.645451] sched: DL replenish lagged too much
> 
> ## Source
> * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
> * Git sha: 54efec8782214652b331c50646013f8526570e8d
> * Git describe: next-20250729
> * Project details:
> https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250729
> * Architectures: arm64
> * Toolchains: gcc-13
> * Kconfigs: Preempt_rt
> 
> ## Test
> * Test log 1: https://qa-reports.linaro.org/api/testruns/29282584/log_file/
> * Test log 2:https://qa-reports.linaro.org/api/testruns/29337984/log_file/
> * Test lava log: https://lkft.validation.linaro.org/scheduler/job/8373114#L19186
> * Test details:
> https://regressions.linaro.org/lkft/linux-next-master/next-20250729/log-parser-test/exception-rtmutex-deadlock-detected/
> * Test plan: https://tuxapi.tuxsuite.com/v1/groups/linaro/projects/lkft/tests/30XMjtCEi0VzsU1gYZ0a7kcTkLJ
> * Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/30fq2ElntxgscJ13dnaD7iL5Z1G/
> * Kernel config:
> https://storage.tuxsuite.com/public/linaro/lkft/builds/30fq2ElntxgscJ13dnaD7iL5Z1G/config
> 
> --
> Linaro LKFT
> https://lkft.linaro.org

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