dvmrp0: entered allmulticast mode dvmrp0: left allmulticast mode ============================================ WARNING: possible recursive locking detected 6.14.0-rc6-syzkaller-00145-g695caca9345a #0 Not tainted -------------------------------------------- syz.3.1106/9205 is trying to acquire lock: ffff88807b3dca68 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0xb0/0x7e0 kernel/bpf/lpm_trie.c:470 but task is already holding lock: ffff88807b3dea68 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0xb0/0x7e0 kernel/bpf/lpm_trie.c:470 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&trie->lock); lock(&trie->lock); *** DEADLOCK *** May be due to missing lock nesting notation 5 locks held by syz.3.1106/9205: #0: ffff88805818be08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline] #0: ffff88805818be08 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release+0x86/0x270 net/socket.c:646 #1: ffffffff8fef9d68 (rtnl_mutex){+.+.}-{4:4}, at: mrtsock_destruct+0x49/0x290 net/ipv4/ipmr.c:1363 #2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline] #2: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2412 #3: ffff88807b3dea68 (&trie->lock){-.-.}-{2:2}, at: trie_delete_elem+0xb0/0x7e0 kernel/bpf/lpm_trie.c:470 #4: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #4: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #4: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2370 [inline] #4: ffffffff8e1bd140 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run2+0x1c2/0x590 kernel/trace/bpf_trace.c:2412 stack backtrace: CPU: 0 UID: 0 PID: 9205 Comm: syz.3.1106 Not tainted 6.14.0-rc6-syzkaller-00145-g695caca9345a #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 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:3039 check_deadlock kernel/locking/lockdep.c:3091 [inline] validate_chain kernel/locking/lockdep.c:3893 [inline] __lock_acquire+0x2117/0x3c40 kernel/locking/lockdep.c:5228 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5851 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 trie_delete_elem+0xb0/0x7e0 kernel/bpf/lpm_trie.c:470 bpf_prog_5186c38a4019a4cb+0x4b/0x53 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:2371 [inline] bpf_trace_run2+0x234/0x590 kernel/trace/bpf_trace.c:2412 __bpf_trace_contention_end+0xca/0x110 include/trace/events/lock.h:122 __do_trace_contention_end include/trace/events/lock.h:122 [inline] 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:577 [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 trie_delete_elem+0xb0/0x7e0 kernel/bpf/lpm_trie.c:470 bpf_prog_7bd364ad62337488+0x49/0x51 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:2371 [inline] bpf_trace_run2+0x234/0x590 kernel/trace/bpf_trace.c:2412 __traceiter_kfree+0x30/0x50 include/trace/events/kmem.h:94 __do_trace_kfree include/trace/events/kmem.h:94 [inline] trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x244/0x4d0 mm/slub.c:4744 kobject_uevent_env+0x2e5/0x1870 lib/kobject_uevent.c:640 __kobject_del+0x168/0x1f0 lib/kobject.c:601 kobject_cleanup lib/kobject.c:680 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x327/0x5a0 lib/kobject.c:737 netdev_queue_update_kobjects+0x432/0x5b0 net/core/net-sysfs.c:1888 remove_queue_kobjects net/core/net-sysfs.c:1985 [inline] netdev_unregister_kobject+0x15d/0x270 net/core/net-sysfs.c:2138 unregister_netdevice_many_notify+0x13aa/0x1f30 net/core/dev.c:11923 mroute_clean_tables+0x27a/0xb30 net/ipv4/ipmr.c:1322 mrtsock_destruct+0x209/0x290 net/ipv4/ipmr.c:1372 ip_ra_control+0x43c/0x590 net/ipv4/ip_sockglue.c:374 raw_close+0x19/0x30 net/ipv4/raw.c:687 inet_release+0x13f/0x280 net/ipv4/af_inet.c:435 __sock_release+0xb3/0x270 net/socket.c:647 sock_close+0x1c/0x30 net/socket.c:1398 __fput+0x402/0xb70 fs/file_table.c:464 __fput_sync+0xa1/0xc0 fs/file_table.c:550 __do_sys_close fs/open.c:1580 [inline] __se_sys_close fs/open.c:1565 [inline] __x64_sys_close+0x86/0x100 fs/open.c:1565 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f542478d169 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:00007f5425591038 EFLAGS: 00000246 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 00007f54249a5fa0 RCX: 00007f542478d169 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007f542480e2a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f54249a5fa0 R15: 00007ffd46ffa368