================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.0.2478/15413 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888077bcc0a8 (&p->tcfa_lock){+.?.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888077bcc0a8 (&p->tcfa_lock){+.?.}-{3:3}, at: est_fetch_counters net/core/gen_estimator.c:67 [inline] ffff888077bcc0a8 (&p->tcfa_lock){+.?.}-{3:3}, at: est_timer+0xd4/0x9f0 net/core/gen_estimator.c:83 {SOFTIRQ-ON-W} state was registered at: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] tcf_mpls_init+0xbff/0x1280 net/sched/act_mpls.c:299 tcf_action_init_1+0x460/0x6d0 net/sched/act_api.c:1431 tcf_action_init+0x2cf/0xab0 net/sched/act_api.c:1506 tcf_action_add net/sched/act_api.c:2100 [inline] tc_ctl_action+0x430/0xbd0 net/sched/act_api.c:2157 rtnetlink_rcv_msg+0x77c/0xb70 net/core/rtnetlink.c:6955 netlink_rcv_skb+0x205/0x470 net/netlink/af_netlink.c:2552 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x82c/0x9e0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:714 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:729 ____sys_sendmsg+0x505/0x830 net/socket.c:2614 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668 __sys_sendmsg net/socket.c:2700 [inline] __do_sys_sendmsg net/socket.c:2705 [inline] __se_sys_sendmsg net/socket.c:2703 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 5205914 hardirqs last enabled at (5205914): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (5205914): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (5205913): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (5205913): [] _raw_spin_lock_irq+0x7d/0xf0 kernel/locking/spinlock.c:170 softirqs last enabled at (5205874): [] bpf_test_run+0x197/0x7b0 net/bpf/test_run.c:-1 softirqs last disabled at (5205877): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (5205877): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (5205877): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&p->tcfa_lock); lock(&p->tcfa_lock); *** DEADLOCK *** 2 locks held by syz.0.2478/15413: #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: bpf_test_timer_enter+0x1a/0x140 net/bpf/test_run.c:40 #1: ffffc90000007be0 ((&est->timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0 kernel/time/timer.c:1744 stack backtrace: CPU: 0 UID: 0 PID: 15413 Comm: syz.0.2478 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_usage_bug+0x297/0x2e0 kernel/locking/lockdep.c:4042 valid_state+0xc3/0xf0 kernel/locking/lockdep.c:4056 mark_lock_irq+0x36/0x390 kernel/locking/lockdep.c:4267 mark_lock+0x11b/0x190 kernel/locking/lockdep.c:4753 mark_usage kernel/locking/lockdep.c:-1 [inline] __lock_acquire+0x680/0xd20 kernel/locking/lockdep.c:5191 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] est_fetch_counters net/core/gen_estimator.c:67 [inline] est_timer+0xd4/0x9f0 net/core/gen_estimator.c:83 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x283/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline] RIP: 0010:write_comp_data kernel/kcov.c:245 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x90 kernel/kcov.c:321 Code: 48 89 44 11 20 e9 c8 7a bd 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 a0 a0 92 65 8b 15 a8 ef e0 10 81 e2 00 01 ff 00 RSP: 0018:ffffc900042ef970 EFLAGS: 00000246 RAX: ffffffff89a368e7 RBX: 0000000000004002 RCX: ffff88807d025a00 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff88807d025a07 R09: 1ffff1100fa04b40 R10: dffffc0000000000 R11: ffffed100fa04b41 R12: ffff88807d025a00 R13: 1ffff1100fa04b40 R14: ffffc900042efa88 R15: dffffc0000000000 constant_test_bit arch/x86/include/asm/bitops.h:206 [inline] arch_test_bit arch/x86/include/asm/bitops.h:238 [inline] tif_test_bit include/linux/thread_info.h:192 [inline] tif_need_resched include/linux/thread_info.h:208 [inline] need_resched include/linux/sched.h:2211 [inline] bpf_test_timer_continue+0x127/0x350 net/bpf/test_run.c:81 bpf_test_run+0x39c/0x7b0 net/bpf/test_run.c:438 bpf_prog_test_run_skb+0xb30/0x1560 net/bpf/test_run.c:1099 bpf_prog_test_run+0x2c7/0x340 kernel/bpf/syscall.c:4590 __sys_bpf+0x581/0x870 kernel/bpf/syscall.c:6047 __do_sys_bpf kernel/bpf/syscall.c:6139 [inline] __se_sys_bpf kernel/bpf/syscall.c:6137 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6137 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f66b098ebe9 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:00007f66b1767038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f66b0bc5fa0 RCX: 00007f66b098ebe9 RDX: 0000000000000050 RSI: 0000200000000900 RDI: 000000000000000a RBP: 00007f66b0a11e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f66b0bc6038 R14: 00007f66b0bc5fa0 R15: 00007ffcf9f438c8 ---------------- Code disassembly (best guess): 0: 48 89 44 11 20 mov %rax,0x20(%rcx,%rdx,1) 5: e9 c8 7a bd 09 jmp 0x9bd7ad2 a: cc int3 b: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: f3 0f 1e fa endbr64 26: 48 8b 04 24 mov (%rsp),%rax * 2a: 65 48 8b 0c 25 08 a0 mov %gs:0xffffffff92a0a008,%rcx <-- trapping instruction 31: a0 92 33: 65 8b 15 a8 ef e0 10 mov %gs:0x10e0efa8(%rip),%edx # 0x10e0efe2 3a: 81 e2 00 01 ff 00 and $0xff0100,%edx