============================================ WARNING: possible recursive locking detected 5.19.0-rc4-next-20220628-syzkaller #0 Not tainted -------------------------------------------- syz-executor.0/3636 is trying to acquire lock: ffffffff8be0e2d8 (trace_printk_lock){..-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] ffffffff8be0e2d8 (trace_printk_lock){..-.}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 but task is already holding lock: ffffffff8be0e2d8 (trace_printk_lock){..-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] ffffffff8be0e2d8 (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.0/3636: #0: ffff88814a120308 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x140/0x680 net/netfilter/x_tables.c:1242 #1: ffffffff8bd87040 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11 #2: ffffffff8be0e2d8 (trace_printk_lock){..-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] #2: ffffffff8be0e2d8 (trace_printk_lock){..-.}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374 #3: ffffffff8bd87040 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11 stack backtrace: CPU: 1 PID: 3636 Comm: syz-executor.0 Not tainted 5.19.0-rc4-next-20220628-syzkaller #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_0605f9f479290f07+0x2f/0x33 bpf_dispatcher_nop_func include/linux/bpf.h:885 [inline] __bpf_prog_run include/linux/filter.h:594 [inline] bpf_prog_run include/linux/filter.h:601 [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_end+0xb5/0xf0 include/trace/events/lock.h:122 trace_contention_end.constprop.0+0xd7/0x1b0 include/trace/events/lock.h:122 __pv_queued_spin_lock_slowpath+0x258/0xb50 kernel/locking/qspinlock.c:560 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_0605f9f479290f07+0x2f/0x33 bpf_dispatcher_nop_func include/linux/bpf.h:885 [inline] __bpf_prog_run include/linux/filter.h:594 [inline] bpf_prog_run include/linux/filter.h:601 [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_end+0xb5/0xf0 include/trace/events/lock.h:122 trace_contention_end+0xc0/0x150 include/trace/events/lock.h:122 __mutex_lock_common kernel/locking/mutex.c:612 [inline] __mutex_lock+0x227/0x1350 kernel/locking/mutex.c:747 xt_find_table_lock+0x140/0x680 net/netfilter/x_tables.c:1242 xt_request_find_table_lock+0x27/0xf0 net/netfilter/x_tables.c:1284 get_info+0x16a/0x730 net/ipv6/netfilter/ip6_tables.c:981 do_ipt_get_ctl+0x152/0x9d0 net/ipv4/netfilter/ip_tables.c:1654 nf_getsockopt+0x72/0xd0 net/netfilter/nf_sockopt.c:116 ip_getsockopt net/ipv4/ip_sockglue.c:1786 [inline] ip_getsockopt+0x164/0x1c0 net/ipv4/ip_sockglue.c:1765 tcp_getsockopt+0x86/0xd0 net/ipv4/tcp.c:4338 __sys_getsockopt+0x216/0x690 net/socket.c:2295 __do_sys_getsockopt net/socket.c:2310 [inline] __se_sys_getsockopt net/socket.c:2307 [inline] __x64_sys_getsockopt+0xba/0x150 net/socket.c:2307 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f080b48a82a Code: 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd458efe18 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f080b48a82a RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007ffd458efe40 R08: 00007ffd458efe3c R09: ffffffffff000000 R10: 00007ffd458efe40 R11: 0000000000000246 R12: 00007ffd458efea0 R13: 0000000000000003 R14: 00007ffd458efe3c R15: 00007f080b56f160