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X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: Ay+A43CY3psyNnxDeKc3N11eKQWN/qdJR6duZ3R4tsXFH+DRKNjB0L1imxwnmXCMAoBZUTjsJsgZb/qRx1CD1w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR11MB6620 X-OriginatorOrg: intel.com Hi, On Fri, Dec 12, 2025 at 07:55:12PM +0100, Zdenek Kabelac wrote: > Hi > > I've noticed this in my message log while suspending my P1 machine > (and unplugging it from my docking station). > > ---- > kernel: UBSAN: shift-out-of-bounds in > drivers/gpu/drm/display/drm_dp_mst_topology.c:4575:36 > kernel: shift exponent -1 is negative > kernel: CPU: 12 UID: 0 PID: 2972 Comm: Xorg Not tainted > 6.18.0-0.rc7.58.fc44.x86_64 #1 PREEMPT(lazy) > kernel: Hardware name: LENOVO 21FFS02H22/21FFS02H22, BIOS N3VET59W (1.59 ) > 05/13/2025 > kernel: Call Trace: > kernel: > kernel: dump_stack_lvl+0x5d/0x80 > kernel: ubsan_epilogue+0x5/0x2b > kernel: __ubsan_handle_shift_out_of_bounds.cold+0xd7/0x1ab > kernel: drm_dp_atomic_release_time_slots.cold+0x1c/0x90 [drm_display_helper] > kernel: drm_atomic_helper_check_modeset+0x2a9/0x690 > pipewire-media-session[3089]: ms.mod.default-profile: device > 'alsa_card.pci-0000_c4_00.1': can't restore profile: No such device > kernel: amdgpu_dm_atomic_check+0x64/0x1570 [amdgpu] > kernel: drm_atomic_check_only+0x180/0x3e0 > kernel: ? __pfx_drm_mode_setcrtc+0x10/0x10 > kernel: drm_atomic_commit+0x71/0xe0 > kernel: ? __pfx___drm_printfn_info+0x10/0x10 > kernel: drm_atomic_helper_set_config+0x7a/0xd0 > kernel: drm_mode_setcrtc+0x37a/0x900 > kernel: ? __wait_for_common+0x162/0x190 > kernel: ? __pfx_drm_mode_setcrtc+0x10/0x10 > kernel: drm_ioctl_kernel+0xae/0x100 > kernel: drm_ioctl+0x2a8/0x550 > kernel: ? __pfx_drm_mode_setcrtc+0x10/0x10 > kernel: amdgpu_drm_ioctl+0x4a/0x90 [amdgpu] > kernel: __x64_sys_ioctl+0x97/0xe0 > kernel: do_syscall_64+0x7e/0x7f0 > kernel: ? __check_object_size.part.0+0x34/0xc0 > kernel: ? drm_ioctl+0x2dd/0x550 > kernel: ? __pfx_drm_mode_setcrtc+0x10/0x10 > kernel: ? ktime_get_mono_fast_ns+0x35/0xe0 > kernel: ? amdgpu_drm_ioctl+0x7b/0x90 [amdgpu] > kernel: ? syscall_exit_work+0x143/0x1b0 > kernel: ? do_syscall_64+0xb6/0x7f0 > kernel: ? do_syscall_64+0xb6/0x7f0 > kernel: ? sched_clock+0x10/0x30 > kernel: ? sched_clock_cpu+0xb/0x30 > kernel: ? irqtime_account_irq+0x3c/0xc0 > kernel: ? irqentry_exit_to_user_mode+0x2c/0x1c0 > kernel: entry_SYSCALL_64_after_hwframe+0x76/0x7e > kernel: RIP: 0033:0x7f1280c2444d > kernel: Code: 04 25 28 00 00 00 48 89 45 c8 31 c0 48 8d 45 10 c7 45 b0 10 00 > 00 00 48 89 45 b8 48 8d 45 d0 48 89 45 c0 b8 10 00 00 00 0f 05 <89> c2 3d 00 > f0 ff ff 77 1a 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 > kernel: RSP: 002b:00007ffc601c14d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > kernel: RAX: ffffffffffffffda RBX: 000000001bc87f60 RCX: 00007f1280c2444d > kernel: RDX: 00007ffc601c1560 RSI: 00000000c06864a2 RDI: 000000000000000d > kernel: RBP: 00007ffc601c1520 R08: 0000000000000000 R09: 0000000000000000 > kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc601c1560 > kernel: R13: 00000000c06864a2 R14: 000000000000000d R15: 0000000000000000 > kernel: > kernel: ---[ end trace ]--- > boltd[1177]: probing: timeout, done: [2636501] (2000000) > kernel: Lockdown: systemd-logind: hibernation is restricted; see man > kernel_lockdown.7 > kernel: Lockdown: systemd-logind: hibernation is restricted; see man > kernel_lockdown.7 > systemd-logind[1183]: The system will suspend now! > ----- > > I'd have guess it didn't liked maybe unplug of cable - however the problem > was later on after resume - where the machine looked 'very slow' - first > I've suspected the latest version of Firefox got somehow slow - but after > clean reboot everything started to work fine & fast again. > > But so far I don't see anything else suspicious in my system log to give > some hints why later on my Xorg session was running so slowly. > > My laptop: ThinkPad P16v Gen 1, 64G RAM, 16 AMD Cores The WARN itself should be removed by https://lore.kernel.org/all/20251119094650.799135-1-suraj.kandpal@intel.com however, the above fix doesn't have other effects besides removing the WARN message/stack trace, so the slow-down you describe must have a differrent root cause than using a -1 as a shift value above. A wild guess is that it's some timeout trying to access the sink (which is inaccissible because the sink was unplugged) and the corresponding MST timeout being rather long (up to 4 sec per MST programming step). I'd suggest opening an AMD DRM driver ticket to get a better idea, attaching there a dmesg log taken after booting with debug enabled (at least adding the drm.debug=0x15e kernel param) and reproducing the problem. > Regards > > Zdenek >