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panic when resuming from hibernate in next-20260406 with PREEMPT_RT Date: Thu, 9 Apr 2026 15:14:10 +0200 Message-ID: <20260409131411.10598-1-spasswolf@web.de> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-rt-devel@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:YYzBKjPwlUxWETH4D6FNCZqwJnwAMbgoUlrR0b1nRZGsngVlVMm M098039BdeWRqVkP1JKo6ouYV/nt6tK5/W8pw76W4+5zO36y58snRydX8RrmXXa9JLi/s5A RyvbbatUf1/MfpVG7HV/yBtxT3rtgInIEqAmtam6KJl1dPL3mpadZKVpe2/cQ80RjUMKy6I JYfneMQV+Z3+L8mUb0E8Q== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:eNVrwvqj4Jc=;AlTRFwfbn7gs8g0ot6I2fuQOOtz 0Evr6EfgWIF3gL5O3HRnFZ0828TznfVRfT/Qq8KY8YESF9UhJtPSq6kTa9XrPRExrTPCTTk43 1YGKa/AurbFQLhTLlD42wUtlDESkCXgdG8VZB3DWD6uuOl2xQIqM0m9yG7iK56m9ubbdBabiU rTDmbCXWbE+A65dEY4SuJIooTJPZa4Xi9WvV3z649zj9h6UF/muWUeVuNIWvIEbM+hPshvoJs zQPZeNQ95ZtnxlEiNS0o8TH3z/vklPaCw6u8qTTywi4gYBk5s+0rA4VtKXwSYubuDAvziXCDv 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gYKpWwSYeQMJHAsBfUcwPLiwxOG+ghWNDZ2/fSFXojGAz8wTWUC77CwKqp/mYybfzV1rxg1Oh /7ZMV38dNrWxBsa7W5n0wZL2qkOLOUuWbqL01FFTQzGJfxjg/QBB+6REJTZD+Xvg21x9+ArOk DtDudSEs/B6bz0PSUagdhwEqSo9aKm7ePBtD8WS+DmKhZhtkWhWpdRqzf3rUnalHwJCrmhoDF R64C7an7DSHtvrVJtCyfku8aw8tPWCHnjAxnDDHD+I2IUlTyhRruxk84JjfY67tUXqK4dAz6v gLhS72ulG1ixnVtBS/zHcdiC4X22yy4SDqX+xcjEXZGEY8D+NPHSFJtuvdjKBK+lkLgfM50fz gel1ExcO9OH2PAciSz08gczlsyXVvrRPTzGI6Im8J+uFfTVlA9Z8kvBQ7Y24nCF81zS5oU+nk FS I noticed that my debian stable (trixie) system running linux next-20260406 would sometimes hang when resuming from hibernate (I also had two similar e= rrors under different circumstances, one just after booting and one when starting= the game stellaris, but hibernate seems to be the best way to provoke this erro= r).=20 There are usually no error messages, but once I got this (incomplete) error= (via drm panic "kmsg"): [ 51.556812][ C0] gpio_amdpt gpio_generic [ 51.556817][ C0] ---[ end trace 0000000000000000 ]--- (the start tag is no= t present in the qr_code) [ 52.616208][ C0] RIP: 0010:__get_vm_area_node+0x140/0x150 [ 52.616214][ C0] Code: 00 00 ff c5 39 c5 0f 4c e8 b8 1e 00 00 00 39 c5 0f = 4f e8 c4 e2 d1 f7 ea e9 3e ff ff ff 4c 89 e7 e8 35 48 01 00 45 31 e4 eb b0 = <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1f 40 d6 41 50 [ 52.616215][ C0] RSP: 0010:ffffae404dcc3818 EFLAGS: 00010206 [ 52.616217][ C0] RAX: 0000000000ff0000 RBX: 000000000000000c RCX: 00000000= 00000022 [ 52.616217][ C0] RDX: 0000000000ff0000 RSI: 0000000000000001 RDI: 00000000= 0000f720 [ 52.616218][ C0] RBP: 000000000000000c R08: ffffae4040000000 R09: ffffce40= 3fffffff [ 52.616218][ C0] R10: ffffce403fffffff R11: 0000000000000006 R12: ffff9f28= 9d400000 [ 52.616219][ C0] R13: ffff9f289d6e9fd0 R14: 0000000000000dc0 R15: 00000000= 0000f720 [ 52.616220][ C0] FS: 00007f814cdc9b40(0000) GS:ffff9f383a215000(0000) knl= GS:0000000000000000 [ 52.616220][ C0] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000000050033 [ 52.616221][ C0] CR2: 00007f8134000020 CR3: 0000000201867000 CR4: 00000000= 00f50ef0 [ 52.616221][ C0] PKRU: 55555554 [ 52.616222][ C0] Kernel panic - not syncing: Fatal exception in interrupt [ 52.616302][ C0] Kenrel Offset: 0xc00000 from 0xffffffff81000000 (relocati= on range: 0xffffffff80000000-0xffffffffbfffffff) I also got a really nice huge qrcode (via drm panic "qr_code") which showed= a little more of the message, but not the beginning of the trace: [ 125.266334][ C17] RSP: 002b:00007ffc1fcae230 EFLAGS: 00000246 ORIG_RAX: 0= 000000000000010 [ 125.266335][ C17] RAX: ffffffffffffffda RBX: 000055845b640060 RCX: 00007f= b699e8e91b [ 125.266335][ C17] RDX: 00007ffc1fcae2d0 RSI: 00000000c05064a7 RDI: 000000= 000000000f [ 125.266336][ C17] RBP: 00007ffc1fcae2d0 R08: 0000000000000060 R09: 000000= 0000000000 [ 125.266336][ C17] R10: 0000000000000003 R11: 0000000000000246 R12: 000000= 00c05064a7 [ 125.266336][ C17] R13: 000000000000000f R14: 00000000c05064a7 R15: 00007f= fc1fcae2d0 [ 125.266337][ C17] </TASK> [ 125.266337][ C17] Modules linked in: ccm snd_usb_audio joydev snd_usbmidi= _lib snd_ump snd_rawmidi snd_seq_dummy snd_hrtimer snd_seq snd_seq_device n= ls_ascii nls_cp437 vfat fat mt7925e mt7925_common mt792x_lib mt76_connac_li= b mt76 intel_rapl_msr snd_hda_codec_atihdmi mac80211 intel_rapl_common snd_= hda_codec_hdmi iosf_mbi snd_hda_intel rapl snd_hda_codec wmi_bmof snd_hda_c= ore spd5118 regmap_i2c snd_intel_dspcfg snd_hwdep snd_pcm libarc4 snd_timer= cfg80211 snd soundcore pcspkr rfkill ccp k10temp evdev nct6775 nct6775_cor= e hwmon_vid configfs efi_pstore efivarfs autofs4 ext4 mbcache jbd2 hid_gene= ric usbhid hid amdgpu drm_client_lib i2c_algo_bit drm_buddy drm_ttm_helper = ttm drm_exec drm_suballoc_helper mfd_core drm_panel_backlight_quirks gpu_sc= hed amdxcp drm_display_helper xhci_pci xhci_hcd drm_kms_helper ahci libahci= drm libata usbcore nvme scsi_mod igc nvme_core cec i2c_piix4 scsi_common v= ideo usb_common nvme_keyring crc16 i2c_smbus nvme_auth wmi hkdf gpio_amdpt = gpio_generic [ 125.266351][ C17] ---[ end trace 0000000000000000 ]--- [ 126.356624][ C17] RIP: 0010:__get_vm_area_node+0x140/0x150 [ 126.356631][ C17] Code: 00 00 ff c5 39 c5 0f 4c e8 b8 1e 00 00 00 39 c5 0= f 4f e8 c4 e2 d1 f7 ea e9 3e ff ff ff 4c 89 e7 e8 f5 49 01 00 45 31 e4 eb b= 0 <0f> 0b 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 0f 1f 40 d6 41 50 [ 126.356633][ C17] RSP: 0018:ffffb50f075275f8 EFLAGS: 00010206 [ 126.356635][ C17] RAX: 0000000000ff0000 RBX: 000000000000000c RCX: 000000= 0000000022 [ 126.356636][ C17] RDX: 0000000000ff0000 RSI: 0000000000000001 RDI: 000000= 000000f720 [ 126.356637][ C17] RBP: 000000000000000c R08: ffffb50f00000000 R09: ffffd5= 0effffffff [ 126.356637][ C17] R10: ffffd50effffffff R11: 0000000000000006 R12: ffff90= 90a6000000 [ 126.356638][ C17] R13: ffff9090a62e9fd0 R14: 000000000000f720 R15: 000000= 0000000dc0 [ 126.356639][ C17] FS: 00007fb699b0eb40(0000) GS:ffff90a00a848000(0000) kn= lGS:0000000000000000 [ 126.356640][ C17] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 126.356640][ C17] CR2: 00007f617c3fa02f CR3: 00000001a0c4e000 CR4: 000000= 0000f50ef0 [ 126.356641][ C17] PKRU: 55555554 [ 126.356642][ C17] Kernel panic - not syncing: Fatal exception in interrupt [ 126.356811][ C17] Kernel Offset: 0x30a00000 from 0xffffffff81000000 (relo= cation range: 0xffffffff80000000-0xffffffffbfffffff) Hardware used: $ lspci 00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Root Complex 00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridge IOM= MU 00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Dummy Host Bridge 00:01.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridg= e GPP Bridge 00:01.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridg= e GPP Bridge 00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Dummy Host Bridge 00:02.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridg= e GPP Bridge 00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Dummy Host Bridge 00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Dummy Host Bridge 00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Dummy Host Bridge 00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridg= e Internal GPP Bridge to Bus [C:A] 00:08.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Ridg= e Internal GPP Bridge to Bus [C:A] 00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev= 71) 00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev = 51) 00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 0 00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 1 00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 2 00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 3 00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 4 00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 5 00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 6 00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Raphael/Granite Rid= ge Data Fabric; Function 7 01:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Upstr= eam Port of PCI Express Switch (rev 25) 02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD/ATI] Navi 10 XL Downs= tream Port of PCI Express Switch (rev 25) 03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] N= avi 44 [RX 9060 XT] (rev c0) 03:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Navi 48 HDMI/D= P Audio Controller 04:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD= 9100 PRO [PM9E1] 05:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Upstream Port (rev 01) 06:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 06:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 06:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 06:08.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 06:0c.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 06:0d.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 600 Series Chipset P= CIe Switch Downstream Port (rev 01) 08:00.0 Ethernet controller: Intel Corporation Ethernet Controller I226-V (= rev 06) 09:00.0 Network controller: MEDIATEK Corp. Device 7925 0b:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] 800 Series Chips= et USB 3.x XHCI Controller (rev 01) 0c:00.0 SATA controller: Advanced Micro Devices, Inc. [AMD] 600 Series Chip= set SATA Controller (rev 01) 0d:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. = [AMD] Raphael/Granite Ridge PCIe Dummy Function (rev c1) 0d:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 19= h PSP/CCP 0d:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Raphael/Granite = Ridge USB 3.1 xHCI 0d:00.4 USB controller: Advanced Micro Devices, Inc. [AMD] Raphael/Granite = Ridge USB 3.1 xHCI 0e:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Raphael/Granite = Ridge USB 2.0 xHCI $ cat /proc/cpuinfo=20 processor : 0 vendor_id : AuthenticAMD cpu family : 26 model : 68 model name : AMD Ryzen 9 9950X 16-Core Processor stepping : 0 microcode : 0xb404035 cpu MHz : 624.194 cache size : 1024 KB physical id : 0 siblings : 32 core id : 0 cpu cores : 16 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 16 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat = pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtsc= p lm constant_tsc rep_good amd_lbr_v2 nopl xtopology nonstop_tsc cpuid extd= _apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 = movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_l= egacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext p= erfctr_core perfctr_nb bpext perfctr_llc mwaitx cpuid_fault cpb cat_l3 cdp_= l3 hw_pstate ssbd mba perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgs= base tsc_adjust bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a avx512f avx512dq= rdseed adx smap avx512ifma clflushopt clwb avx512cd sha_ni avx512bw avx512= vl xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_m= bm_local user_shstk avx_vnni avx512_bf16 clzero irperf xsaveerptr rdpru wbn= oinvd cppc arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasi= d decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif x2avic v_= spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq = avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid bus_lock_detect movdiri mo= vdir64b overflow_recov succor smca fsrm avx512_vp2intersect flush_l1d amd_l= br_pmc_freeze bugs : sysret_ss_attrs spectre_v1 spectre_v2 spec_store_bypass srso spectr= e_v2_user vmscape bogomips : 8599.99 TLB size : 192 4K pages clflush size : 64 cache_alignment : 64 address sizes : 48 bits physical, 48 bits virtual power management: ts ttp tm hwpstate cpb eff_freq_ro [13] [14] As the error does not occur in v7.0-rc7 I bisected the issue, declaring a c= ommit as GOOD when it passes 18 hibernate/resumes cycles (the issue is not 100% reproduci= ble) All these kernel are compiled with PREEMPT_RT: 7.0.0-rc7 18 hibernate/resume cycles withot crash, GOOD 7.0.0-rc7-next-20260406-master crash on 1st resume, BAD 7.0.0-rc7-bisect-06060-g00f03539e3d9 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc7-bisect-09155-g9a6b64640388 crash on 1st resume, BAD 7.0.0-rc4-bisect-01504-g8e005ef09ba5 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc7-bisect-08350-gb82dff8ab846 crash on 4th resume, BAD 7.0.0-rc7-bisect-06517-ga03c0f5a4d5f 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc6-bisect-01673-gcdd65e8bb954 crash on 6th resume, BAD 7.0.0-rc4-bisect-00705-g02ade2557eba 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc4-bisect-01453-g353f20082505 crash on 8th resume, BAD 7.0.0-rc4-bisect-01428-g4c3aeb11d504 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc4-bisect-01440-g60c741a13fd1 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc4-bisect-01446-g32c1c35b6d8b crash on 12th resume, BAD 7.0.0-rc4-bisect-01443-g02c3060ee303 18 hibernate/resume cycles without cra= sh, GOOD 7.0.0-rc4-bisect-01445-g4bb2f0721ed8 crash on 1st resume, BAD 7.0.0-rc4-bisect-01444-g3539437f354b crash on 3rd resume, BAD The result of the bisection points to=20 commit 3539437f354b ("drm/amd/display: Move FPU Guards From DML To DC - Par= t 1") as the first bad commit. As the offending commit contains preemption related macros I tried commit 3539437f354b ("drm/amd/display: Move FPU Guards From DML To DC - Part 1") without PREEMPT_RT and got no error in 24 cycles: 7.0.0-rc4-nort-01444-g3539437f354b 24 hibernate/resume cycles without crash Any Ideas? Bert Karwatzki