Hi,
I've just noticed the following while testing v6.2-rc3-rt1.
# lspci -k | grep -EA3 'VGA|3D|Display'
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3 Processor Integrated Graphics Controller (rev 06)
DeviceName: Onboard IGD
Subsystem: Dell Device 0620
Kernel driver in use: i915
---
[ 11.960670] BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:46
[ 11.960672] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 429, name: systemd-udevd
[ 11.960673] preempt_count: 1, expected: 0
[ 11.960674] RCU nest depth: 0, expected: 0
[ 11.960674] 2 locks held by systemd-udevd/429:
[ 11.960675] #0: ffff8e1f022b71b0 (&dev->mutex){....}-{3:3}, at: __driver_attach+0xcb/0x1d0
[ 11.960684] #1: ffff8e1e27d32ed8 (&uncore->lock){+.+.}-{2:2}, at: gen6_reset_engines+0x1b/0x50 [i915]
[ 11.960897] Preemption disabled at:
[ 11.960898] [<ffffffffc07d5d62>] __intel_gt_reset+0x92/0x100 [i915]
[ 11.961024] CPU: 3 PID: 429 Comm: systemd-udevd Not tainted 6.2.0-rc3-rt1 #1
[ 11.961025] Hardware name: Dell Inc. PowerEdge T20/0VD5HY, BIOS A03 11/25/2013
[ 11.961026] Call Trace:
[ 11.961027] <TASK>
[ 11.961029] ? __intel_gt_reset+0x92/0x100 [i915]
[ 11.961155] dump_stack_lvl+0x57/0x81
[ 11.961160] __might_resched.cold+0xf4/0x12f
[ 11.961165] rt_spin_lock+0x4a/0xe0
[ 11.961169] ? gen6_reset_engines+0x1b/0x50 [i915]
[ 11.961294] ? __pfx_gen6_reset_engines+0x10/0x10 [i915]
[ 11.961453] gen6_reset_engines+0x1b/0x50 [i915]
[ 11.961579] __intel_gt_reset+0xa0/0x100 [i915]
[ 11.961708] i915_driver_mmio_probe+0x126/0x220 [i915]
[ 11.961815] ? intel_gt_probe_all+0x70/0x280 [i915]
[ 11.961939] i915_driver_probe+0xd4/0x3c0 [i915]
[ 11.962047] ? i915_pci_probe+0x87/0x1b0 [i915]
[ 11.962160] local_pci_probe+0x45/0x80
[ 11.962167] pci_call_probe+0x56/0x170
[ 11.962173] pci_device_probe+0x79/0xf0
[ 11.962175] ? driver_sysfs_add+0x73/0xd0
[ 11.962179] really_probe+0xe1/0x390
[ 11.962181] ? pm_runtime_barrier+0x50/0x90
[ 11.962187] __driver_probe_device+0x78/0x180
[ 11.962191] driver_probe_device+0x1e/0x90
[ 11.962195] __driver_attach+0xd6/0x1d0
[ 11.962197] ? __pfx___driver_attach+0x10/0x10
[ 11.962201] bus_for_each_dev+0x7b/0xc0
[ 11.962206] bus_add_driver+0x1b2/0x200
[ 11.962212] driver_register+0x8f/0xf0
[ 11.962215] i915_init+0x20/0x80 [i915]
[ 11.962337] ? __pfx_init_module+0x10/0x10 [i915]
[ 11.962461] do_one_initcall+0x47/0x190
[ 11.962467] ? rcu_read_lock_sched_held+0x43/0x80
[ 11.962471] ? trace_kmalloc+0x3c/0x160
[ 11.962473] ? kmalloc_trace+0x44/0x60
[ 11.962476] do_init_module+0x4c/0x200
[ 11.962480] __do_sys_finit_module+0xb4/0x130
[ 11.962497] do_syscall_64+0x5c/0x90
[ 11.962505] ? do_syscall_64+0x69/0x90
[ 11.962507] ? lockdep_hardirqs_on+0x79/0x100
[ 11.962511] ? do_syscall_64+0x69/0x90
[ 11.962513] ? do_syscall_64+0x69/0x90
[ 11.962515] ? lockdep_hardirqs_on+0x79/0x100
[ 11.962518] ? do_syscall_64+0x69/0x90
[ 11.962520] ? lockdep_hardirqs_on+0x79/0x100
[ 11.962523] entry_SYSCALL_64_after_hwframe+0x72/0xdc
[ 11.962526] RIP: 0033:0x7fa35d020e5d
[ 11.962529] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89
d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73
01 c3 48 8b 0d 93 af 1b 00 f7 d8 64 89 01 48
[ 11.962530] RSP: 002b:00007ffd62f23a78 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[ 11.962532] RAX: ffffffffffffffda RBX: 000056058a1429e0 RCX: 00007fa35d020e5d
[ 11.962533] RDX: 0000000000000000 RSI: 00007fa35d25232c RDI: 0000000000000017
[ 11.962534] RBP: 0000000000020000 R08: 0000000000000000 R09: 0000000000000002
[ 11.962534] R10: 0000000000000017 R11: 0000000000000246 R12: 00007fa35d25232c
[ 11.962535] R13: 000056058a147360 R14: 0000000000000007 R15: 000056058a12b790
[ 11.962548] </TASK>
[ 11.964024] i915 0000:00:02.0: vgaarb: deactivate vga console
[ 11.974095] Console: switching to colour dummy device 80x25
[ 11.981308] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=io+mem,decodes=io+mem:owns=io+mem
[ 12.041808] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0
---
Looks like this discussion might be relevant [1], but I'm not sure if
progress has been made after that.
Thanks!
Juri
1 - https://lore.kernel.org/all/20211006164628.s2mtsdd2jdbfyf7g@xxxxxxxxxxxxx/
