============================================ WARNING: possible recursive locking detected 6.14.0-rc3-syzkaller-00079-g87a132e73910 #0 Not tainted -------------------------------------------- syz-executor/17000 is trying to acquire lock: ffff88805c7d71e0 (&qs->lock){..-.}-{2:2}, at: __queue_map_get+0x2b6/0x360 kernel/bpf/queue_stack_maps.c:105 but task is already holding lock: ffff88805c7d51e0 (&qs->lock){..-.}-{2:2}, at: __queue_map_get+0x2b6/0x360 kernel/bpf/queue_stack_maps.c:105 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&qs->lock); lock(&qs->lock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor/17000: #0: ffff8880b863ed58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 #1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline] #1: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2412 #2: ffff88805c7d51e0 (&qs->lock){..-.}-{2:2}, at: __queue_map_get+0x2b6/0x360 kernel/bpf/queue_stack_maps.c:105 #3: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #3: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #3: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline] #3: ffffffff8e1bcc80 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2412 stack backtrace: CPU: 0 UID: 0 PID: 17000 Comm: syz-executor Not tainted 6.14.0-rc3-syzkaller-00079-g87a132e73910 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x2e3/0x410 kernel/locking/lockdep.c:3039 check_deadlock kernel/locking/lockdep.c:3091 [inline] validate_chain kernel/locking/lockdep.c:3893 [inline] __lock_acquire+0x2117/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 __queue_map_get+0x2b6/0x360 kernel/bpf/queue_stack_maps.c:105 bpf_prog_00798911c748094f+0x43/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline] bpf_trace_run2+0x234/0x590 kernel/trace/bpf_trace.c:2412 __bpf_trace_contention_end+0xca/0x110 include/trace/events/lock.h:122 __do_trace_contention_end include/trace/events/lock.h:122 [inline] trace_contention_end.constprop.0+0xf0/0x170 include/trace/events/lock.h:122 __pv_queued_spin_lock_slowpath+0x27e/0xc90 kernel/locking/qspinlock.c:557 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:577 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:51 [inline] queued_spin_lock include/asm-generic/qspinlock.h:114 [inline] do_raw_spin_lock+0x210/0x2c0 kernel/locking/spinlock_debug.c:116 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x42/0x60 kernel/locking/spinlock.c:162 __queue_map_get+0x2b6/0x360 kernel/bpf/queue_stack_maps.c:105 bpf_prog_00798911c748094f+0x43/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1290 [inline] __bpf_prog_run include/linux/filter.h:701 [inline] bpf_prog_run include/linux/filter.h:708 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2371 [inline] bpf_trace_run2+0x234/0x590 kernel/trace/bpf_trace.c:2412 __bpf_trace_tlb_flush+0xd2/0x110 include/trace/events/tlb.h:38 __do_trace_tlb_flush include/trace/events/tlb.h:38 [inline] trace_tlb_flush+0xf7/0x180 include/trace/events/tlb.h:38 switch_mm_irqs_off+0x39b/0xb10 arch/x86/mm/tlb.c:635 context_switch kernel/sched/core.c:5362 [inline] __schedule+0xd5a/0x5890 kernel/sched/core.c:6765 __schedule_loop kernel/sched/core.c:6842 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6857 do_nanosleep+0x216/0x510 kernel/time/hrtimer.c:2141 hrtimer_nanosleep+0x158/0x380 kernel/time/hrtimer.c:2188 common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1356 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1402 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1379 [inline] __x64_sys_clock_nanosleep+0x347/0x4a0 kernel/time/posix-timers.c:1379 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9ef95bf6a5 Code: Unable to access opcode bytes at 0x7f9ef95bf67b. RSP: 002b:00007ffff77988a0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 00000000000002d5 RCX: 00007f9ef95bf6a5 RDX: 00007ffff77988e0 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007ffff779894c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000001388 R13: 00000000000927c0 R14: 00000000001044f5 R15: 00007ffff77989a0