From: Ihor Solodrai <ihor.solodrai@linux.dev>
To: Thomas Gleixner <tglx@linutronix.de>,
LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Gabriele Monaco <gmonaco@redhat.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Michael Jeanson <mjeanson@efficios.com>,
Jens Axboe <axboe@kernel.dk>,
"Paul E. McKenney" <paulmck@kernel.org>,
"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
Florian Weimer <fweimer@redhat.com>,
Tim Chen <tim.c.chen@intel.com>,
Yury Norov <yury.norov@gmail.com>,
Shrikanth Hegde <sshegde@linux.ibm.com>,
bpf <bpf@vger.kernel.org>,
sched-ext@lists.linux.dev, Kernel Team <kernel-team@meta.com>,
Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Puranjay Mohan <puranjay@kernel.org>, Tejun Heo <tj@kernel.org>
Subject: Re: [patch V5 00/20] sched: Rewrite MM CID management
Date: Tue, 27 Jan 2026 16:01:11 -0800 [thread overview]
Message-ID: <2b7463d7-0f58-4e34-9775-6e2115cfb971@linux.dev> (raw)
In-Reply-To: <20251119171016.815482037@linutronix.de>
On 11/19/25 9:26 AM, Thomas Gleixner wrote:
> This is a follow up on the V4 series which can be found here:
>
> https://lore.kernel.org/20251104075053.700034556@linutronix.de
>
> The V1 cover letter contains a detailed analyisis of the issues:
>
> https://lore.kernel.org/20251015164952.694882104@linutronix.de
>
> TLDR: The CID management is way to complex and adds significant overhead
> into scheduler hotpaths.
>
> The series rewrites MM CID management in a more simplistic way which
> focusses on low overhead in the scheduler while maintaining per task CIDs
> as long as the number of threads is not exceeding the number of possible
> CPUs.
Hello Thomas, everyone.
BPF CI caught a deadlock on current bpf-next tip (35538dba51b4).
Job: https://github.com/kernel-patches/bpf/actions/runs/21417415035/job/61670254640
It appears to be related to this series. Pasting a splat below.
Any ideas what might be going on?
Thanks!
[ 45.009755] watchdog: CPU2: Watchdog detected hard LOCKUP on cpu 2
[ 45.009763] Modules linked in: bpf_testmod(OE)
[ 45.009769] irq event stamp: 685710
[ 45.009771] hardirqs last enabled at (685709): [<ffffffffb5bfa8b8>] _raw_spin_unlock_irq+0x28/0x50
[ 45.009786] hardirqs last disabled at (685710): [<ffffffffb5bfa651>] _raw_spin_lock_irqsave+0x51/0x60
[ 45.009789] softirqs last enabled at (685650): [<ffffffffb3345e2a>] fpu_clone+0xda/0x4f0
[ 45.009795] softirqs last disabled at (685648): [<ffffffffb3345dd2>] fpu_clone+0x82/0x4f0
[ 45.009803] CPU: 2 UID: 0 PID: 126 Comm: test_progs Tainted: G OE 6.19.0-rc5-g748c6d52700a-dirty #1 PREEMPT(full)
[ 45.009808] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 45.009810] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 45.009813] RIP: 0010:queued_spin_lock_slowpath+0x6cc/0xac0
[ 45.009820] Code: 0c 24 8b 03 66 85 c0 74 38 48 b8 00 00 00 00 00 fc ff df 48 89 da 49 89 de 48 c1 ea 03 41 83 e6 07 48 01 c2 41 83 c6 03 f3 90 <0f> b6 02 41 38 c6 7c 08 84 c0 0f 85 90 02 00 00 8b 03 66 85 c0 75
[ 45.009823] RSP: 0018:ffffc9000128f750 EFLAGS: 00000002
[ 45.009828] RAX: 0000000000100101 RBX: ffff8881520ba000 RCX: 0000000000000000
[ 45.009830] RDX: ffffed102a417400 RSI: 0000000000000002 RDI: ffff8881520ba002
[ 45.009832] RBP: 1ffff92000251eec R08: ffffffffb5bfb6c9 R09: ffffed102a417400
[ 45.009834] R10: ffffed102a417401 R11: 0000000000000004 R12: ffff88815213b100
[ 45.009836] R13: 00000000000c0000 R14: 0000000000000003 R15: 0000000000000002
[ 45.009838] FS: 00007f6ab3e0de00(0000) GS:ffff8881998dd000(0000) knlGS:0000000000000000
[ 45.009841] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 45.009843] CR2: 00007f6ab2873d58 CR3: 0000000103357005 CR4: 0000000000770ef0
[ 45.009845] PKRU: 55555554
[ 45.009846] Call Trace:
[ 45.009850] <TASK>
[ 45.009855] ? __pfx_queued_spin_lock_slowpath+0x10/0x10
[ 45.009862] do_raw_spin_lock+0x1d9/0x270
[ 45.009868] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 45.009871] ? __pfx___might_resched+0x10/0x10
[ 45.009878] task_rq_lock+0xcf/0x3c0
[ 45.009884] mm_cid_fixup_task_to_cpu+0xb0/0x460
[ 45.009888] ? __pfx_mm_cid_fixup_task_to_cpu+0x10/0x10
[ 45.009892] ? lock_acquire+0x14e/0x2b0
[ 45.009896] ? mark_held_locks+0x40/0x70
[ 45.009901] sched_mm_cid_fork+0x6da/0xc20
[ 45.009905] ? __pfx_sched_mm_cid_fork+0x10/0x10
[ 45.009908] ? copy_process+0x217b/0x6950
[ 45.009913] copy_process+0x2bce/0x6950
[ 45.009919] ? __pfx_copy_process+0x10/0x10
[ 45.009921] ? find_held_lock+0x2b/0x80
[ 45.009926] ? _copy_from_user+0x53/0xa0
[ 45.009933] kernel_clone+0xce/0x600
[ 45.009937] ? __pfx_kernel_clone+0x10/0x10
[ 45.009942] ? __lock_acquire+0x481/0x2590
[ 45.009947] __do_sys_clone3+0x16e/0x1b0
[ 45.009950] ? __pfx___do_sys_clone3+0x10/0x10
[ 45.009952] ? lock_acquire+0x14e/0x2b0
[ 45.009955] ? __might_fault+0x9b/0x140
[ 45.009963] ? _copy_to_user+0x5c/0x70
[ 45.009967] ? __x64_sys_rt_sigprocmask+0x258/0x400
[ 45.009974] ? do_user_addr_fault+0x4c2/0xa40
[ 45.009978] ? lockdep_hardirqs_on_prepare+0xd7/0x180
[ 45.009982] do_syscall_64+0x6b/0x3a0
[ 45.009988] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 45.009992] RIP: 0033:0x7f6ab430fc5d
[ 45.009996] Code: 79 14 0e 00 c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 ea ff ff ff 48 85 ff 74 28 48 85 d2 74 23 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 14 74 01 c3 31 ed 4c 89 c7 ff d2 48 89 c7 b8 3c 00 00
[ 45.009998] RSP: 002b:00007fffb282a148 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
[ 45.010002] RAX: ffffffffffffffda RBX: 00007f6ab4282720 RCX: 00007f6ab430fc5d
[ 45.010004] RDX: 00007f6ab4282720 RSI: 0000000000000058 RDI: 00007fffb282a1a0
[ 45.010005] RBP: 00007fffb282a180 R08: 00007f6ab28736c0 R09: 00007fffb282a2a7
[ 45.010007] R10: 0000000000000008 R11: 0000000000000202 R12: 00007f6ab28736c0
[ 45.010009] R13: ffffffffffffff08 R14: 0000000000000000 R15: 00007fffb282a1a0
[ 45.010015] </TASK>
[ 45.010018] Kernel panic - not syncing: Hard LOCKUP
[ 45.010020] CPU: 2 UID: 0 PID: 126 Comm: test_progs Tainted: G OE 6.19.0-rc5-g748c6d52700a-dirty #1 PREEMPT(full)
[ 45.010025] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 45.010026] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 45.010027] Call Trace:
[ 45.010029] <NMI>
[ 45.010031] dump_stack_lvl+0x5d/0x80
[ 45.010036] vpanic+0x133/0x3f0
[ 45.010042] panic+0xce/0xce
[ 45.010045] ? __pfx_panic+0x10/0x10
[ 45.010050] ? __show_trace_log_lvl+0x2ee/0x323
[ 45.010053] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 45.010057] ? nmi_panic+0x91/0x130
[ 45.010061] nmi_panic.cold+0x14/0x14
[ 45.010065] ? __pfx_nmi_panic+0x10/0x10
[ 45.010070] watchdog_hardlockup_check.cold+0x12a/0x1c5
[ 45.010076] __perf_event_overflow+0x2fe/0xeb0
[ 45.010082] ? __pfx___perf_event_overflow+0x10/0x10
[ 45.010085] ? __pfx_x86_perf_event_set_period+0x10/0x10
[ 45.010091] handle_pmi_common+0x405/0x920
[ 45.010096] ? __pfx_handle_pmi_common+0x10/0x10
[ 45.010109] ? __pfx_intel_bts_interrupt+0x10/0x10
[ 45.010115] intel_pmu_handle_irq+0x1c5/0x5d0
[ 45.010119] ? lock_acquire+0x1e9/0x2b0
[ 45.010122] ? nmi_handle.part.0+0x2f/0x370
[ 45.010127] perf_event_nmi_handler+0x3e/0x70
[ 45.010130] nmi_handle.part.0+0x13f/0x370
[ 45.010134] ? trace_rcu_watching+0x105/0x150
[ 45.010140] default_do_nmi+0x3b/0x110
[ 45.010144] ? irqentry_nmi_enter+0x6f/0x80
[ 45.010147] exc_nmi+0xe3/0x110
[ 45.010151] end_repeat_nmi+0xf/0x53
[ 45.010154] RIP: 0010:queued_spin_lock_slowpath+0x6cc/0xac0
[ 45.010157] Code: 0c 24 8b 03 66 85 c0 74 38 48 b8 00 00 00 00 00 fc ff df 48 89 da 49 89 de 48 c1 ea 03 41 83 e6 07 48 01 c2 41 83 c6 03 f3 90 <0f> b6 02 41 38 c6 7c 08 84 c0 0f 85 90 02 00 00 8b 03 66 85 c0 75
[ 45.010159] RSP: 0018:ffffc9000128f750 EFLAGS: 00000002
[ 45.010162] RAX: 0000000000100101 RBX: ffff8881520ba000 RCX: 0000000000000000
[ 45.010164] RDX: ffffed102a417400 RSI: 0000000000000002 RDI: ffff8881520ba002
[ 45.010165] RBP: 1ffff92000251eec R08: ffffffffb5bfb6c9 R09: ffffed102a417400
[ 45.010167] R10: ffffed102a417401 R11: 0000000000000004 R12: ffff88815213b100
[ 45.010169] R13: 00000000000c0000 R14: 0000000000000003 R15: 0000000000000002
[ 45.010172] ? queued_spin_lock_slowpath+0x559/0xac0
[ 45.010177] ? queued_spin_lock_slowpath+0x6cc/0xac0
[ 45.010181] ? queued_spin_lock_slowpath+0x6cc/0xac0
[ 45.010185] </NMI>
[ 45.010186] <TASK>
[ 45.010187] ? __pfx_queued_spin_lock_slowpath+0x10/0x10
[ 45.010194] do_raw_spin_lock+0x1d9/0x270
[ 45.010198] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 45.010201] ? __pfx___might_resched+0x10/0x10
[ 45.010206] task_rq_lock+0xcf/0x3c0
[ 45.010211] mm_cid_fixup_task_to_cpu+0xb0/0x460
[ 45.010215] ? __pfx_mm_cid_fixup_task_to_cpu+0x10/0x10
[ 45.010219] ? lock_acquire+0x14e/0x2b0
[ 45.010223] ? mark_held_locks+0x40/0x70
[ 45.010228] sched_mm_cid_fork+0x6da/0xc20
[ 45.010232] ? __pfx_sched_mm_cid_fork+0x10/0x10
[ 45.010234] ? copy_process+0x217b/0x6950
[ 45.010238] copy_process+0x2bce/0x6950
[ 45.010245] ? __pfx_copy_process+0x10/0x10
[ 45.010247] ? find_held_lock+0x2b/0x80
[ 45.010251] ? _copy_from_user+0x53/0xa0
[ 45.010256] kernel_clone+0xce/0x600
[ 45.010259] ? __pfx_kernel_clone+0x10/0x10
[ 45.010264] ? __lock_acquire+0x481/0x2590
[ 45.010269] __do_sys_clone3+0x16e/0x1b0
[ 45.010272] ? __pfx___do_sys_clone3+0x10/0x10
[ 45.010274] ? lock_acquire+0x14e/0x2b0
[ 45.010277] ? __might_fault+0x9b/0x140
[ 45.010284] ? _copy_to_user+0x5c/0x70
[ 45.010288] ? __x64_sys_rt_sigprocmask+0x258/0x400
[ 45.010293] ? do_user_addr_fault+0x4c2/0xa40
[ 45.010296] ? lockdep_hardirqs_on_prepare+0xd7/0x180
[ 45.010300] do_syscall_64+0x6b/0x3a0
[ 45.010305] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 45.010307] RIP: 0033:0x7f6ab430fc5d
[ 45.010309] Code: 79 14 0e 00 c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 ea ff ff ff 48 85 ff 74 28 48 85 d2 74 23 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 14 74 01 c3 31 ed 4c 89 c7 ff d2 48 89 c7 b8 3c 00 00
[ 45.010311] RSP: 002b:00007fffb282a148 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
[ 45.010314] RAX: ffffffffffffffda RBX: 00007f6ab4282720 RCX: 00007f6ab430fc5d
[ 45.010316] RDX: 00007f6ab4282720 RSI: 0000000000000058 RDI: 00007fffb282a1a0
[ 45.010317] RBP: 00007fffb282a180 R08: 00007f6ab28736c0 R09: 00007fffb282a2a7
[ 45.010319] R10: 0000000000000008 R11: 0000000000000202 R12: 00007f6ab28736c0
[ 45.010320] R13: ffffffffffffff08 R14: 0000000000000000 R15: 00007fffb282a1a0
[ 45.010326] </TASK>
[ 46.053092]
[ 46.053095] ================================
[ 46.053096] WARNING: inconsistent lock state
[ 46.053098] 6.19.0-rc5-g748c6d52700a-dirty #1 Tainted: G OE
[ 46.053101] --------------------------------
[ 46.053102] inconsistent {INITIAL USE} -> {IN-NMI} usage.
[ 46.053103] test_progs/126 [HC1[1]:SC0[0]:HE0:SE1] takes:
[ 46.053107] ffffffffb6eace78 (&nmi_desc[NMI_LOCAL].lock){....}-{2:2}, at: __register_nmi_handler+0x83/0x350
[ 46.053119] {INITIAL USE} state was registered at:
[ 46.053120] lock_acquire+0x14e/0x2b0
[ 46.053123] _raw_spin_lock_irqsave+0x39/0x60
[ 46.053127] __register_nmi_handler+0x83/0x350
[ 46.053130] init_hw_perf_events+0x1d0/0x850
[ 46.053135] do_one_initcall+0xd0/0x3a0
[ 46.053138] kernel_init_freeable+0x34c/0x580
[ 46.053141] kernel_init+0x1c/0x150
[ 46.053145] ret_from_fork+0x48c/0x590
[ 46.053149] ret_from_fork_asm+0x1a/0x30
[ 46.053151] irq event stamp: 685710
[ 46.053153] hardirqs last enabled at (685709): [<ffffffffb5bfa8b8>] _raw_spin_unlock_irq+0x28/0x50
[ 46.053156] hardirqs last disabled at (685710): [<ffffffffb5bfa651>] _raw_spin_lock_irqsave+0x51/0x60
[ 46.053159] softirqs last enabled at (685650): [<ffffffffb3345e2a>] fpu_clone+0xda/0x4f0
[ 46.053163] softirqs last disabled at (685648): [<ffffffffb3345dd2>] fpu_clone+0x82/0x4f0
[ 46.053166]
[ 46.053166] other info that might help us debug this:
[ 46.053168] Possible unsafe locking scenario:
[ 46.053168]
[ 46.053168] CPU0
[ 46.053169] ----
[ 46.053170] lock(&nmi_desc[NMI_LOCAL].lock);
[ 46.053172] <Interrupt>
[ 46.053173] lock(&nmi_desc[NMI_LOCAL].lock);
[ 46.053174]
[ 46.053174] *** DEADLOCK ***
[ 46.053174]
[ 46.053175] 5 locks held by test_progs/126:
[ 46.053177] #0: ffffffffb6f49790 (scx_fork_rwsem){.+.+}-{0:0}, at: sched_fork+0xf9/0x6b0
[ 46.053184] #1: ffff88810c4930e8 (&mm->mm_cid.mutex){+.+.}-{4:4}, at: sched_mm_cid_fork+0xdf/0xc20
[ 46.053190] #2: ffffffffb7671a80 (rcu_read_lock){....}-{1:3}, at: sched_mm_cid_fork+0x692/0xc20
[ 46.053195] #3: ffff888110548a90 (&p->pi_lock){-.-.}-{2:2}, at: task_rq_lock+0x6c/0x3c0
[ 46.053201] #4: ffff8881520ba018 (&rq->__lock){-.-.}-{2:2}, at: task_rq_lock+0xcf/0x3c0
[ 46.053207]
[ 46.053207] stack backtrace:
[ 46.053209] CPU: 2 UID: 0 PID: 126 Comm: test_progs Tainted: G OE 6.19.0-rc5-g748c6d52700a-dirty #1 PREEMPT(full)
[ 46.053214] Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE
[ 46.053215] Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[ 46.053217] Call Trace:
[ 46.053220] <NMI>
[ 46.053223] dump_stack_lvl+0x5d/0x80
[ 46.053227] print_usage_bug.part.0+0x22b/0x2c0
[ 46.053231] lock_acquire+0x272/0x2b0
[ 46.053235] ? __register_nmi_handler+0x83/0x350
[ 46.053240] _raw_spin_lock_irqsave+0x39/0x60
[ 46.053242] ? __register_nmi_handler+0x83/0x350
[ 46.053246] __register_nmi_handler+0x83/0x350
[ 46.053250] native_stop_other_cpus+0x31c/0x460
[ 46.053255] ? __pfx_native_stop_other_cpus+0x10/0x10
[ 46.053260] vpanic+0x1c5/0x3f0
[ 46.053265] panic+0xce/0xce
[ 46.053268] ? __pfx_panic+0x10/0x10
[ 46.053272] ? __show_trace_log_lvl+0x2ee/0x323
[ 46.053276] ? entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 46.053279] ? nmi_panic+0x91/0x130
[ 46.053283] nmi_panic.cold+0x14/0x14
[ 46.053287] ? __pfx_nmi_panic+0x10/0x10
[ 46.053291] watchdog_hardlockup_check.cold+0x12a/0x1c5
[ 46.053296] __perf_event_overflow+0x2fe/0xeb0
[ 46.053300] ? __pfx___perf_event_overflow+0x10/0x10
[ 46.053303] ? __pfx_x86_perf_event_set_period+0x10/0x10
[ 46.053308] handle_pmi_common+0x405/0x920
[ 46.053312] ? __pfx_handle_pmi_common+0x10/0x10
[ 46.053322] ? __pfx_intel_bts_interrupt+0x10/0x10
[ 46.053327] intel_pmu_handle_irq+0x1c5/0x5d0
[ 46.053330] ? lock_acquire+0x1e9/0x2b0
[ 46.053334] ? nmi_handle.part.0+0x2f/0x370
[ 46.053337] perf_event_nmi_handler+0x3e/0x70
[ 46.053340] nmi_handle.part.0+0x13f/0x370
[ 46.053343] ? trace_rcu_watching+0x105/0x150
[ 46.053348] default_do_nmi+0x3b/0x110
[ 46.053351] ? irqentry_nmi_enter+0x6f/0x80
[ 46.053355] exc_nmi+0xe3/0x110
[ 46.053358] end_repeat_nmi+0xf/0x53
[ 46.053361] RIP: 0010:queued_spin_lock_slowpath+0x6cc/0xac0
[ 46.053365] Code: 0c 24 8b 03 66 85 c0 74 38 48 b8 00 00 00 00 00 fc ff df 48 89 da 49 89 de 48 c1 ea 03 41 83 e6 07 48 01 c2 41 83 c6 03 f3 90 <0f> b6 02 41 38 c6 7c 08 84 c0 0f 85 90 02 00 00 8b 03 66 85 c0 75
[ 46.053367] RSP: 0018:ffffc9000128f750 EFLAGS: 00000002
[ 46.053370] RAX: 0000000000100101 RBX: ffff8881520ba000 RCX: 0000000000000000
[ 46.053372] RDX: ffffed102a417400 RSI: 0000000000000002 RDI: ffff8881520ba002
[ 46.053374] RBP: 1ffff92000251eec R08: ffffffffb5bfb6c9 R09: ffffed102a417400
[ 46.053376] R10: ffffed102a417401 R11: 0000000000000004 R12: ffff88815213b100
[ 46.053378] R13: 00000000000c0000 R14: 0000000000000003 R15: 0000000000000002
[ 46.053380] ? queued_spin_lock_slowpath+0x559/0xac0
[ 46.053385] ? queued_spin_lock_slowpath+0x6cc/0xac0
[ 46.053389] ? queued_spin_lock_slowpath+0x6cc/0xac0
[ 46.053392] </NMI>
[ 46.053393] <TASK>
[ 46.053394] ? __pfx_queued_spin_lock_slowpath+0x10/0x10
[ 46.053400] do_raw_spin_lock+0x1d9/0x270
[ 46.053404] ? __pfx_do_raw_spin_lock+0x10/0x10
[ 46.053407] ? __pfx___might_resched+0x10/0x10
[ 46.053411] task_rq_lock+0xcf/0x3c0
[ 46.053416] mm_cid_fixup_task_to_cpu+0xb0/0x460
[ 46.053420] ? __pfx_mm_cid_fixup_task_to_cpu+0x10/0x10
[ 46.053423] ? lock_acquire+0x14e/0x2b0
[ 46.053427] ? mark_held_locks+0x40/0x70
[ 46.053431] sched_mm_cid_fork+0x6da/0xc20
[ 46.053435] ? __pfx_sched_mm_cid_fork+0x10/0x10
[ 46.053437] ? copy_process+0x217b/0x6950
[ 46.053441] copy_process+0x2bce/0x6950
[ 46.053446] ? __pfx_copy_process+0x10/0x10
[ 46.053448] ? find_held_lock+0x2b/0x80
[ 46.053452] ? _copy_from_user+0x53/0xa0
[ 46.053457] kernel_clone+0xce/0x600
[ 46.053460] ? __pfx_kernel_clone+0x10/0x10
[ 46.053465] ? __lock_acquire+0x481/0x2590
[ 46.053469] __do_sys_clone3+0x16e/0x1b0
[ 46.053472] ? __pfx___do_sys_clone3+0x10/0x10
[ 46.053474] ? lock_acquire+0x14e/0x2b0
[ 46.053477] ? __might_fault+0x9b/0x140
[ 46.053483] ? _copy_to_user+0x5c/0x70
[ 46.053486] ? __x64_sys_rt_sigprocmask+0x258/0x400
[ 46.053491] ? do_user_addr_fault+0x4c2/0xa40
[ 46.053495] ? lockdep_hardirqs_on_prepare+0xd7/0x180
[ 46.053498] do_syscall_64+0x6b/0x3a0
[ 46.053503] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 46.053506] RIP: 0033:0x7f6ab430fc5d
[ 46.053509] Code: 79 14 0e 00 c3 0f 1f 84 00 00 00 00 00 f3 0f 1e fa b8 ea ff ff ff 48 85 ff 74 28 48 85 d2 74 23 49 89 c8 b8 b3 01 00 00 0f 05 <48> 85 c0 7c 14 74 01 c3 31 ed 4c 89 c7 ff d2 48 89 c7 b8 3c 00 00
[ 46.053511] RSP: 002b:00007fffb282a148 EFLAGS: 00000202 ORIG_RAX: 00000000000001b3
[ 46.053514] RAX: ffffffffffffffda RBX: 00007f6ab4282720 RCX: 00007f6ab430fc5d
[ 46.053516] RDX: 00007f6ab4282720 RSI: 0000000000000058 RDI: 00007fffb282a1a0
[ 46.053517] RBP: 00007fffb282a180 R08: 00007f6ab28736c0 R09: 00007fffb282a2a7
[ 46.053519] R10: 0000000000000008 R11: 0000000000000202 R12: 00007f6ab28736c0
[ 46.053521] R13: ffffffffffffff08 R14: 0000000000000000 R15: 00007fffb282a1a0
[ 46.053525] </TASK>
[ 46.053527] Shutting down cpus with NMI
[ 46.053722] Kernel Offset: 0x32000000 from 0xffffffff81000000 (relocation range: 0xffffffff80000000-0xffffffffbfffffff)
>
> [...]
next prev parent reply other threads:[~2026-01-28 0:01 UTC|newest]
Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-19 17:26 [patch V5 00/20] sched: Rewrite MM CID management Thomas Gleixner
2025-11-19 17:26 ` [patch V5 01/20] sched/mmcid: Revert the complex " Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 02/20] sched/mmcid: Use proper data structures Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 03/20] sched/mmcid: Cacheline align MM CID storage Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 04/20] sched: Fixup whitespace damage Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 05/20] sched/mmcid: Move scheduler code out of global header Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 06/20] sched/mmcid: Prevent pointless work in mm_update_cpus_allowed() Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 07/20] cpumask: Introduce cpumask_weighted_or() Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:26 ` [patch V5 08/20] sched/mmcid: Use cpumask_weighted_or() Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 09/20] cpumask: Cache num_possible_cpus() Thomas Gleixner
2025-11-20 11:20 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-21 22:56 ` [patch V5 09/20] " Marek Szyprowski
2025-11-22 15:36 ` Thomas Gleixner
2025-11-22 16:24 ` Marek Szyprowski
2025-11-22 19:09 ` Paul E. McKenney
2025-11-23 19:03 ` [tip: core/rseq] cpu: Initialize __num_possible_cpus correctly tip-bot2 for Thomas Gleixner
2025-11-22 18:47 ` [patch V5 09/20] cpumask: Cache num_possible_cpus() Paul E. McKenney
2025-11-22 19:10 ` Thomas Gleixner
2025-11-22 0:27 ` Nathan Chancellor
2025-11-26 4:36 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 10/20] sched/mmcid: Convert mm CID mask to a bitmap Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 11/20] signal: Move MMCID exit out of sighand lock Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 12/20] sched/mmcid: Move initialization out of line Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 13/20] sched/mmcid: Provide precomputed maximal value Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 14/20] sched/mmcid: Serialize sched_mm_cid_fork()/exit() with a mutex Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 15/20] sched/mmcid: Introduce per task/CPU ownership infrastructure Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 16/20] sched/mmcid: Provide new scheduler CID mechanism Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 17/20] sched/mmcid: Provide CID ownership mode fixup functions Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 18/20] irqwork: Move data struct to a types header Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 19/20] sched/mmcid: Implement deferred mode change Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` tip-bot2 for Thomas Gleixner
2025-11-19 17:27 ` [patch V5 20/20] sched/mmcid: Switch over to the new mechanism Thomas Gleixner
2025-11-20 11:19 ` [tip: core/rseq] " tip-bot2 for Thomas Gleixner
2025-11-22 0:43 ` [patch V5 20/20] " Nathan Chancellor
2025-11-22 15:02 ` Thomas Gleixner
2025-11-22 16:54 ` Shrikanth Hegde
2025-11-23 19:03 ` [tip: core/rseq] sched/mmcid: Ensure that per CPU threshold is > 0 tip-bot2 for Thomas Gleixner
2025-11-26 4:36 ` [tip: core/rseq] sched/mmcid: Switch over to the new mechanism tip-bot2 for Thomas Gleixner
2026-01-28 0:01 ` Ihor Solodrai [this message]
2026-01-28 8:46 ` [patch V5 00/20] sched: Rewrite MM CID management Peter Zijlstra
2026-01-28 11:57 ` Thomas Gleixner
2026-01-28 12:58 ` Shrikanth Hegde
2026-01-28 13:56 ` Thomas Gleixner
2026-01-28 22:24 ` Thomas Gleixner
2026-01-28 22:33 ` Ihor Solodrai
2026-01-28 23:08 ` Ihor Solodrai
2026-01-29 17:06 ` Thomas Gleixner
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