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route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510020000 definitions=main-2510130013 >> Hi, >> >> I'd like to draw the attention of the scheduler maintainers to a number >> of kernel bugzilla reports submitted by a colleague a couple of weeks ago: >> >> 6.12.18: >> https://bugzilla.kernel.org/show_bug.cgi?id=220447 >> https://bugzilla.kernel.org/show_bug.cgi?id=220448 >> >> v6.16-rt3 >> https://bugzilla.kernel.org/show_bug.cgi?id=220450 >> https://bugzilla.kernel.org/show_bug.cgi?id=220449 >> >> There seems to be something wrong with either the logic or the locking. >> In one case this resulted in a NULL pointer dereference in >> pick_next_entity(). In another case it resulted in >> BUG_ON(!rq->nr_running) in dequeue_top_rt_rq() and >> SCHED_WARN_ON(!se->on_rq) in update_entity_lag(). >> >> My colleague suggests that the NULL pointer dereference may be due to >> pick_eevdf() returning NULL in pick_next_entity(). >> >> I did some digging and found that >> https://gitlab.com/linux-kernel/stable/-/commit/86b37810 would not have >> been included in 6.12.18, but the equivalent fix should have been in the >> 6.16 load. >> >> We haven't yet bottomed out the root cause. >> >> Any suggestions or assistance would be appreciated. >> >> Thanks, >> Chris >> >> > >Maybe this patch can be useful for your problem. >https://lore.kernel.org/all/tencent_3177343A3163451463643E434C61911B4208@qq.com/ > >If I understand correctly, we may dequeue_entity twice in >rt_mutex_setprio()/__sched_setscheduler(). cfs_bandwidth may break the >state of p->on_rq and se->on_rq. Thank veruy much! https://lore.kernel.org/all/tencent_3177343A3163451463643E434C61911B4208@qq.com/ can fix the original panic https://bugzilla.kernel.org/show_bug.cgi?id=220447, now we encounter the other !se->on_rq WARNING. Do you know we already have the fix? Any suggestions or assistance would be appreciated. [ 1461.107139] [ T17007] !se->on_rq [ 1461.107144] [ T17007] WARNING: CPU: 1 PID: 17007 at kernel/sched/fair.c:704 update_entity_lag+0x7c/0x90 ...... [ 1461.107339] [ T17007] CPU: 1 UID: 0 PID: 17007 Comm: containerd Kdump: loaded Tainted: G O 6.12.0-1-rt-amd64 #1 Debian 6.12.40-1.stx.130 [ 1461.107344] [ T17007] Tainted: [O]=OOT_MODULE [ 1461.107345] [ T17007] Hardware name: Dell Inc. PowerEdge XR8720t/0K54D0, BIOS 0.2.4 [X-REV] 08/11/2025 [ 1461.107347] [ T17007] RIP: 0010:update_entity_lag+0x7c/0x90 [ 1461.107352] [ T17007] Code: 0f 4c fd 48 89 7b 78 5b 5d c3 cc cc cc cc 80 3d 63 cb d3 01 00 75 aa 48 c7 c7 62 b4 8c 9f c6 05 53 cb d3 01 01 e8 64 a6 fa ff <0f> 0b eb 93 48 89 de e8 f8 a3 ff ff 48 89 c7 eb b9 0f 1f 00 90 90 [ 1461.107355] [ T17007] RSP: 0018:ff77b604c779f828 EFLAGS: 00010082 [ 1461.107358] [ T17007] RAX: 0000000000000000 RBX: ff4e7dface2ab000 RCX: ff4e7e183baa0908 [ 1461.107360] [ T17007] RDX: 00000000ffffffd8 RSI: 0000000000000027 RDI: ff4e7e183baa0900 [ 1461.107362] [ T17007] RBP: ff4e7df9c8e7ee00 R08: 0000000000000000 R09: ff77b604c779f7b8 [ 1461.107364] [ T17007] R10: 0000000000000001 R11: ff4e7e193edbb0a8 R12: 0000000000000009 [ 1461.107365] [ T17007] R13: 0000000000000001 R14: 0000000000000000 R15: ff4e7dface2ab100 [ 1461.107367] [ T17007] FS: 00007faad3d1e700(0000) GS:ff4e7e183ba80000(0000) knlGS:0000000000000000 [ 1461.107370] [ T17007] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 1461.107372] [ T17007] CR2: 000055add20c7000 CR3: 000000022b1a6004 CR4: 0000000000773ef0 [ 1461.107373] [ T17007] PKRU: 55555554 [ 1461.107375] [ T17007] Call Trace: [ 1461.107378] [ T17007] [ 1461.107381] [ T17007] dequeue_entity+0x95/0x600 [ 1461.107384] [ T17007] dequeue_entities+0xc9/0x590 [ 1461.107387] [ T17007] dequeue_task_fair+0xd5/0x1f0 [ 1461.107390] [ T17007] ? sched_clock+0xc/0x30 [ 1461.107395] [ T17007] detach_task+0x36/0x60 [ 1461.107399] [ T17007] sched_balance_rq+0x77f/0xe70 [ 1461.107404] [ T17007] sched_balance_newidle+0x1c8/0x430 [ 1461.107407] [ T17007] pick_next_task_fair+0x2e/0x3c0 [ 1461.107410] [ T17007] __schedule+0x269/0xbb0 [ 1461.107416] [ T17007] ? hrtimer_start_range_ns+0x2e1/0x460 [ 1461.107421] [ T17007] schedule+0x23/0xf0 [ 1461.107424] [ T17007] do_nanosleep+0x65/0x150 [ 1461.107429] [ T17007] hrtimer_nanosleep+0x7a/0xf0 [ 1461.107432] [ T17007] ? __pfx_hrtimer_wakeup+0x10/0x10 [ 1461.107436] [ T17007] __x64_sys_nanosleep+0xac/0xe0 Thanks, Jiping Thanks, Hao