============================================ WARNING: possible recursive locking detected 6.13.0-rc5-syzkaller-gccb98ccef0e5 #0 Not tainted -------------------------------------------- syz.1.53/6756 is trying to acquire lock: ffff8880294611e0 (&qs->lock){-...}-{2:2}, at: __stack_map_get+0x2a6/0x350 kernel/bpf/queue_stack_maps.c:140 but task is already holding lock: ffff88804e6171e0 (&qs->lock){-...}-{2:2}, at: __stack_map_get+0x2a6/0x350 kernel/bpf/queue_stack_maps.c:140 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 5 locks held by syz.1.53/6756: #0: ffffffff8e23c028 (tracepoints_mutex){+.+.}-{4:4}, at: tracepoint_probe_unregister+0x9c/0xd70 kernel/tracepoint.c:501 #1: ffffffff8e23bfe0 (tracepoints_mutex.wait_lock){....}-{2:2}, at: __mutex_lock_common kernel/locking/mutex.c:687 [inline] #1: ffffffff8e23bfe0 (tracepoints_mutex.wait_lock){....}-{2:2}, at: __mutex_lock+0x728/0xa60 kernel/locking/mutex.c:735 #2: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #2: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2361 [inline] #2: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2403 #3: ffff88804e6171e0 (&qs->lock){-...}-{2:2}, at: __stack_map_get+0x2a6/0x350 kernel/bpf/queue_stack_maps.c:140 #4: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #4: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #4: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2361 [inline] #4: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2403 stack backtrace: CPU: 1 UID: 0 PID: 6756 Comm: syz.1.53 Not tainted 6.13.0-rc5-syzkaller-gccb98ccef0e5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 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:3037 check_deadlock kernel/locking/lockdep.c:3089 [inline] validate_chain kernel/locking/lockdep.c:3891 [inline] __lock_acquire+0x2117/0x3c40 kernel/locking/lockdep.c:5226 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 __stack_map_get+0x2a6/0x350 kernel/bpf/queue_stack_maps.c:140 bpf_prog_7a16b54e5ee857f9+0x43/0x47 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:2362 [inline] bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2403 __bpf_trace_contention_end+0xca/0x110 include/trace/events/lock.h:122 __traceiter_contention_end+0x5a/0xa0 include/trace/events/lock.h:122 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:584 [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 __stack_map_get+0x2a6/0x350 kernel/bpf/queue_stack_maps.c:140 bpf_prog_7a16b54e5ee857f9+0x43/0x47 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:2362 [inline] bpf_trace_run2+0x231/0x590 kernel/trace/bpf_trace.c:2403 __bpf_trace_contention_end+0xca/0x110 include/trace/events/lock.h:122 __traceiter_contention_end+0x5a/0xa0 include/trace/events/lock.h:122 trace_contention_end+0xd2/0x140 include/trace/events/lock.h:122 __mutex_lock_common kernel/locking/mutex.c:708 [inline] __mutex_lock+0x2b7/0xa60 kernel/locking/mutex.c:735 tracepoint_probe_unregister+0x9c/0xd70 kernel/tracepoint.c:501 bpf_raw_tp_link_release+0x35/0x70 kernel/bpf/syscall.c:3610 bpf_link_free+0xe9/0x390 kernel/bpf/syscall.c:3132 bpf_link_put_direct kernel/bpf/syscall.c:3175 [inline] bpf_link_release+0x5d/0x80 kernel/bpf/syscall.c:3182 __fput+0x3f8/0xb60 fs/file_table.c:450 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9795785d29 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffccb593a28 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 0000000000012edf RCX: 00007f9795785d29 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f9795977ba0 R08: 0000000000000001 R09: 00007ffccb593d1f R10: 00007f9795600000 R11: 0000000000000246 R12: 0000000000013110 R13: 00007f9795975fa0 R14: 0000000000000226 R15: ffffffffffffffff