SELinux: unrecognized netlink message: protocol=0 nlmsg_type=21184 sclass=netlink_route_socket pid=6392 comm=syz.0.174 ============================================ WARNING: possible recursive locking detected 6.15.0-rc1-syzkaller #0 Not tainted -------------------------------------------- syz.0.174/6392 is trying to acquire lock: ffffc900038770d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:423 but task is already holding lock: ffffc900039e10d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:423 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&rb->spinlock); lock(&rb->spinlock); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz.0.174/6392: #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace include/linux/rcupdate_trace.h:58 [inline] #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: class_rcu_tasks_trace_constructor include/linux/rcupdate_trace.h:102 [inline] #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: __do_trace_sys_enter include/trace/events/syscalls.h:18 [inline] #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: trace_sys_enter include/trace/events/syscalls.h:18 [inline] #0: ffffffff8e3c0c00 (rcu_read_lock_trace){....}-{0:0}, at: syscall_trace_enter+0x17d/0x260 kernel/entry/common.c:61 #1: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #1: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2362 [inline] #1: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1b6/0x590 kernel/trace/bpf_trace.c:2404 #2: ffffc900039e10d8 (&rb->spinlock){-.-.}-{2:2}, at: __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:423 #3: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #3: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #3: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2362 [inline] #3: ffffffff8e3c1580 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1b6/0x590 kernel/trace/bpf_trace.c:2404 stack backtrace: CPU: 0 UID: 0 PID: 6392 Comm: syz.0.174 Not tainted 6.15.0-rc1-syzkaller #0 PREEMPT(full) 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+0x1e9/0x240 kernel/locking/lockdep.c:3042 check_deadlock kernel/locking/lockdep.c:3094 [inline] validate_chain kernel/locking/lockdep.c:3896 [inline] __lock_acquire+0xff7/0x1ba0 kernel/locking/lockdep.c:5235 lock_acquire kernel/locking/lockdep.c:5866 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5823 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:423 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:549 [inline] bpf_ringbuf_output+0x62/0xd0 kernel/bpf/ringbuf.c:539 bpf_prog_918f90024333f9ff+0x43/0x47 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2363 [inline] bpf_trace_run2+0x230/0x590 kernel/trace/bpf_trace.c:2404 __bpf_trace_contention_end+0xc9/0x110 include/trace/events/lock.h:122 __do_trace_contention_end include/trace/events/lock.h:122 [inline] trace_contention_end.constprop.0+0xdb/0x160 include/trace/events/lock.h:122 __pv_queued_spin_lock_slowpath+0x281/0xcf0 kernel/locking/qspinlock.c:374 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:572 [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+0x20e/0x2b0 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 __bpf_ringbuf_reserve+0x36e/0x4b0 kernel/bpf/ringbuf.c:423 ____bpf_ringbuf_output kernel/bpf/ringbuf.c:549 [inline] bpf_ringbuf_output+0x62/0xd0 kernel/bpf/ringbuf.c:539 bpf_prog_918f90024333f9ff+0x43/0x47 bpf_dispatcher_nop_func include/linux/bpf.h:1316 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2363 [inline] bpf_trace_run2+0x230/0x590 kernel/trace/bpf_trace.c:2404 __bpf_trace_sys_enter+0x37/0x60 include/trace/events/syscalls.h:18 __do_trace_sys_enter include/trace/events/syscalls.h:18 [inline] trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter+0x1b5/0x260 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:169 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:199 [inline] do_syscall_64+0x1ee/0x260 arch/x86/entry/syscall_64.c:90 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5cf618d169 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:00007f5cf3ff60e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f5cf63a5fa8 RCX: 00007f5cf618d169 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5cf63a5fa8 RBP: 00007f5cf63a5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5cf63a5fac R13: 0000000000000000 R14: 00007fff7221d7c0 R15: 00007fff7221d8a8