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[ 12.937313][ T1] lock(&p->se.child_burst.lock); [ 12.937607][ T1] [ 12.937607][ T1] *** DEADLOCK *** [ 12.937607][ T1] [ 12.938066][ T1] May be due to missing lock nesting notation [ 12.938066][ T1] [ 12.950833][ T1] 3 locks held by systemd/1: [ 12.951242][ T1] #0: ffffffff90ac9c20 (cgroup_threadgroup_rwsem){++++}-{0:0}, at: cgroup_can_fork (kernel/cgroup/cgroup.c:6671) [ 12.952118][ T1] #1: ffffffff906080d8 (tasklist_lock){.+.+}-{3:3}, at: sched_clone_bore (kernel/sched/bore.c:311) [ 12.952919][ T1] #2: ffffffff9061f3f0 (&p->se.child_burst.lock){+.+.}-{3:3}, at: sched_clone_bore (kernel/sched/bore.c:168 kernel/sched/bore.c:266 kernel/sched/bore.c:312) [ 12.953794][ T1] [ 12.953794][ T1] stack backtrace: [ 12.954284][ T1] CPU: 1 UID: 0 PID: 1 Comm: systemd Not tainted 6.16.0-rc5-00115-ge9c2688b128a #1 PREEMPT(full) [ 12.954289][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 12.954291][ T1] Call Trace: [ 12.954295][ T1] [ 12.954298][ T1] dump_stack_lvl (lib/dump_stack.c:123) [ 12.955284][ T1] print_deadlock_bug (kernel/locking/lockdep.c:3047) [ 12.955291][ T1] validate_chain (kernel/locking/lockdep.c:3901) [ 12.955295][ T1] __lock_acquire (kernel/locking/lockdep.c:5240) [ 12.955299][ T1] ? print_bad_irq_dependency (kernel/locking/lockdep.c:2600) [ 12.955303][ T1] lock_acquire (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) [ 12.955306][ T1] ? update_child_burst_topological (kernel/sched/bore.c:168 kernel/sched/bore.c:226) [ 12.955312][ T1] ? lock_acquire (kernel/locking/lockdep.c:473 kernel/locking/lockdep.c:5873) [ 12.955316][ T1] _raw_spin_lock (include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) [ 12.955320][ T1] ? update_child_burst_topological (kernel/sched/bore.c:168 kernel/sched/bore.c:226) [ 12.955324][ T1] update_child_burst_topological (kernel/sched/bore.c:168 kernel/sched/bore.c:226) [ 12.955329][ T1] sched_clone_bore (kernel/sched/bore.c:267 kernel/sched/bore.c:312) [ 12.955334][ T1] copy_process (kernel/fork.c:2321) [ 12.955341][ T1] kernel_clone (include/linux/random.h:26 kernel/fork.c:2606) [ 12.955344][ T1] ? kvm_sched_clock_read (arch/x86/kernel/kvmclock.c:91) [ 12.955347][ T1] ? local_clock_noinstr (kernel/sched/clock.c:301) [ 12.955350][ T1] ? local_clock (arch/x86/include/asm/preempt.h:95 kernel/sched/clock.c:316) [ 12.955352][ T1] ? __lock_release+0x12c/0x240 [ 12.955356][ T1] ? trace_preempt_on (include/trace/events/preemptirq.h:53 kernel/trace/trace_preemptirq.c:120) [ 12.955363][ T1] __do_compat_sys_ia32_clone (arch/x86/kernel/sys_ia32.c:254) [ 12.955371][ T1] do_int80_emulation (arch/x86/entry/syscall_32.c:83 arch/x86/entry/syscall_32.c:172) [ 12.955379][ T1] ? trace_irq_disable+0x25/0xc0 [ 12.955382][ T1] ? do_int80_emulation (include/linux/entry-common.h:119 arch/x86/entry/syscall_32.c:145) [ 12.955386][ T1] asm_int80_emulation (arch/x86/include/asm/idtentry.h:626) [ 12.955390][ T1] RIP: 0023:0xf7f1e092 [ 12.955395][ T1] Code: 00 00 00 e9 90 ff ff ff ff a3 24 00 00 00 68 30 00 00 00 e9 80 ff ff ff ff a3 f8 ff ff ff 66 90 00 00 00 00 00 00 00 00 cd 80 8d b4 26 00 00 00 00 8d b6 00 00 00 00 8b 1c 24 c3 8d b4 26 00 All code ======== 0: 00 00 add %al,(%rax) 2: 00 e9 add %ch,%cl 4: 90 nop 5: ff (bad) 6: ff (bad) 7: ff (bad) 8: ff a3 24 00 00 00 jmp *0x24(%rbx) e: 68 30 00 00 00 push $0x30 13: e9 80 ff ff ff jmp 0xffffffffffffff98 18: ff a3 f8 ff ff ff jmp *-0x8(%rbx) 1e: 66 90 xchg %ax,%ax ... 28: cd 80 int $0x80 2a:* c3 ret <-- trapping instruction 2b: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 32: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 38: 8b 1c 24 mov (%rsp),%ebx 3b: c3 ret 3c: 8d .byte 0x8d 3d: b4 26 mov $0x26,%ah ... Code starting with the faulting instruction =========================================== 0: c3 ret 1: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 8: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi e: 8b 1c 24 mov (%rsp),%ebx 11: c3 ret 12: 8d .byte 0x8d 13: b4 26 mov $0x26,%ah ... [ 12.955398][ T1] RSP: 002b:00000000ffddbf1c EFLAGS: 00200282 ORIG_RAX: 0000000000000078 [ 12.955401][ T1] RAX: ffffffffffffffda RBX: 0000000001200011 RCX: 0000000000000000 [ 12.955403][ T1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000f72808a8 [ 12.955405][ T1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 [ 12.955406][ T1] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 12.955407][ T1] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 12.955412][ T1] The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250716/202507160735.72c4502b-lkp@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki