============================================ WARNING: possible recursive locking detected 5.19.0-rc5-syzkaller-00233-gb1c428b6c368 #0 Not tainted -------------------------------------------- syz-executor.2/28755 is trying to acquire lock: ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 but task is already holding lock: ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(trace_printk_lock); lock(trace_printk_lock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor.2/28755: #0: ffff8880b9a39f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:552 [inline] #0: ffff8880b9a39f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x8c/0x120 kernel/sched/core.c:537 #1: ffffffff8bd83ba0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11 #2: ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] #2: ffffffff8be0a5d8 (trace_printk_lock){....}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 #3: ffffffff8bd83ba0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11 stack backtrace: CPU: 1 PID: 28755 Comm: syz-executor.2 Not tainted 5.19.0-rc5-syzkaller-00233-gb1c428b6c368 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_deadlock_bug kernel/locking/lockdep.c:2988 [inline] check_deadlock kernel/locking/lockdep.c:3031 [inline] validate_chain kernel/locking/lockdep.c:3816 [inline] __lock_acquire.cold+0x1f5/0x3b4 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 ___bpf_prog_run+0x369d/0x7960 kernel/bpf/core.c:1850 __bpf_prog_run32+0x8a/0xd0 kernel/bpf/core.c:2073 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2046 [inline] bpf_trace_run2+0x110/0x340 kernel/trace/bpf_trace.c:2083 __bpf_trace_contention_begin+0xb5/0xf0 include/trace/events/lock.h:95 trace_contention_begin.constprop.0+0xda/0x1b0 include/trace/events/lock.h:95 __pv_queued_spin_lock_slowpath+0x103/0xb50 kernel/locking/qspinlock.c:405 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [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+0x200/0x2a0 kernel/locking/spinlock_debug.c:115 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline] _raw_spin_lock_irqsave+0x41/0x50 kernel/locking/spinlock.c:162 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 ___bpf_prog_run+0x369d/0x7960 kernel/bpf/core.c:1850 __bpf_prog_run32+0x8a/0xd0 kernel/bpf/core.c:2073 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2046 [inline] bpf_trace_run2+0x110/0x340 kernel/trace/bpf_trace.c:2083 __bpf_trace_contention_begin+0xb5/0xf0 include/trace/events/lock.h:95 trace_contention_begin.constprop.0+0xda/0x1b0 include/trace/events/lock.h:95 __pv_queued_spin_lock_slowpath+0x103/0xb50 kernel/locking/qspinlock.c:405 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [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+0x200/0x2a0 kernel/locking/spinlock_debug.c:115 raw_spin_rq_lock_nested kernel/sched/core.c:552 [inline] raw_spin_rq_lock_nested+0x8c/0x120 kernel/sched/core.c:537 raw_spin_rq_lock kernel/sched/sched.h:1304 [inline] rq_lock kernel/sched/sched.h:1602 [inline] __schedule+0x225/0x4b50 kernel/sched/core.c:6375 schedule+0xd2/0x1f0 kernel/sched/core.c:6530 exit_to_user_mode_loop kernel/entry/common.c:157 [inline] exit_to_user_mode_prepare+0x142/0x250 kernel/entry/common.c:201 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:307 asm_sysvec_reschedule_ipi+0x1b/0x20 arch/x86/include/asm/idtentry.h:654 RIP: 0033:0x7f5f7e2371d1 Code: 3d e4 e1 09 01 00 75 81 44 0f b6 6c 24 0f 44 8d 4d 04 89 e8 41 89 c0 41 81 e0 ff 1f 00 00 43 8b 14 84 39 d5 0f 84 70 ff ff ff <85> d2 0f 84 67 01 00 00 83 c0 01 41 39 c1 75 da 89 e8 25 ff 1f 00 RSP: 002b:00007ffe4a57c4a0 EFLAGS: 00000a06 RAX: 00000000e4aa50e2 RBX: 00007f5f7e39bff8 RCX: 0000001b2ee20000 RDX: 000000007c10d0e2 RSI: 0000001b2ee23188 RDI: 0000000008d567d7 RBP: 00000000e4aa50e2 R08: 00000000000010e2 R09: 00000000e4aa50e6 R10: 00007ffe4a57c670 R11: 0000000000000246 R12: 00007f5f7e390000 R13: 0000000000000001 R14: 0000000000003ae1 R15: ffffffff817be20d