============================================
WARNING: possible recursive locking detected
6.0.0-rc3-syzkaller-00826-g1bfe26fb0827 #0 Not tainted
--------------------------------------------
syz-executor.5/7070 is trying to acquire lock:
ffffffff8c011798 (trace_printk_lock){-.-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline]
ffffffff8c011798 (trace_printk_lock){-.-.}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374
but task is already holding lock:
ffffffff8c011798 (trace_printk_lock){-.-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline]
ffffffff8c011798 (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.5/7070:
#0: ffffffff8d8557c8 (nf_sockopt_mutex){+.+.}-{3:3}, at: nf_sockopt_find.constprop.0+0x2a/0x2a0 net/netfilter/nf_sockopt.c:67
#1: ffffffff8bf89680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11
#2: ffffffff8c011798 (trace_printk_lock){-.-.}-{2:2}, at: ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline]
#2: ffffffff8c011798 (trace_printk_lock){-.-.}-{2:2}, at: bpf_trace_printk+0xcf/0x170 kernel/trace/bpf_trace.c:374
#3: ffffffff8bf89680 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run2+0x0/0x340 kernel/trace/./bpf_trace.h:11
stack backtrace:
CPU: 1 PID: 7070 Comm: syz-executor.5 Not tainted 6.0.0-rc3-syzkaller-00826-g1bfe26fb0827 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
Call Trace:
<TASK>
__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+0x116/0x3a7 kernel/locking/lockdep.c:5053
lock_acquire kernel/locking/lockdep.c:5666 [inline]
lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
__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:957 [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_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_0605f9f479290f07+0x2f/0x33
bpf_dispatcher_nop_func include/linux/bpf.h:957 [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_begin+0xb5/0xf0 include/trace/events/lock.h:95
trace_contention_begin+0xc0/0x150 include/trace/events/lock.h:95
__mutex_lock_common kernel/locking/mutex.c:605 [inline]
__mutex_lock+0x13c/0x1350 kernel/locking/mutex.c:747
nf_sockopt_find.constprop.0+0x2a/0x2a0 net/netfilter/nf_sockopt.c:67
nf_getsockopt+0x29/0xd0 net/netfilter/nf_sockopt.c:113
ip_getsockopt+0x185/0x1e0 net/ipv4/ip_sockglue.c:1796
tcp_getsockopt+0x95/0xf0 net/ipv4/tcp.c:4389
__sys_getsockopt+0x216/0x690 net/socket.c:2296
__do_sys_getsockopt net/socket.c:2311 [inline]
__se_sys_getsockopt net/socket.c:2308 [inline]
__x64_sys_getsockopt+0xba/0x150 net/socket.c:2308
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+0x63/0xcd
RIP: 0033:0x7f616fa8a9ea
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:00007fff22430178 EFLAGS: 00000212 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fff2243018c RCX: 00007f616fa8a9ea
RDX: 0000000000000061 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 0000000000000003 R08: 00007fff2243018c R09: ffffffffffffff00
R10: 00007fff224301e0 R11: 0000000000000212 R12: 00007fff224301e0
R13: 0000000000129fa3 R14: 0000000000000014 R15: 00007fff224308f0
</TASK>