================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. syz.0.1866/13306 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff88807d6858a8 (&p->tcfa_lock){+.?.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff88807d6858a8 (&p->tcfa_lock){+.?.}-{3:3}, at: est_fetch_counters net/core/gen_estimator.c:67 [inline] ffff88807d6858a8 (&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_vlan_init+0x973/0xdc0 net/sched/act_vlan.c:256 tcf_action_init_1+0x463/0x6d0 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+0x82f/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+0x219/0x270 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: 1550 hardirqs last enabled at (1550): [] __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:159 [inline] hardirqs last enabled at (1550): [] _raw_spin_unlock_irq+0x23/0x50 kernel/locking/spinlock.c:202 hardirqs last disabled at (1549): [] __raw_spin_lock_irq include/linux/spinlock_api_smp.h:117 [inline] hardirqs last disabled at (1549): [] _raw_spin_lock_irq+0x7d/0xf0 kernel/locking/spinlock.c:170 softirqs last enabled at (1064): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (1064): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (1064): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (1515): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (1515): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (1515): [] __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 *** 3 locks held by syz.0.1866/13306: #0: ffff88807b358ca0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:453 [inline] #0: ffff88807b358ca0 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x16f/0x380 mm/gup.c:1962 #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #1: ffffffff8e139ee0 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x250 mm/pgtable-generic.c:286 #2: ffffc90000007be0 ((&est->timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0 kernel/time/timer.c:1744 stack backtrace: CPU: 0 UID: 0 PID: 13306 Comm: syz.0.1866 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:spin_lock include/linux/spinlock.h:351 [inline] RIP: 0010:__pte_offset_map_lock+0x136/0x210 mm/pgtable-generic.c:401 Code: 2c 2f 48 83 c5 28 48 89 e8 48 c1 e8 03 49 be 00 00 00 00 00 fc ff df 42 80 3c 30 00 74 08 48 89 ef e8 6e 22 13 00 48 8b 6d 00 <48> 89 ef e8 92 e0 6c 09 43 80 3c 34 00 74 08 48 89 df e8 53 22 13 RSP: 0018:ffffc9001af9f948 EFLAGS: 00000246 RAX: 1ffffd400028853d RBX: ffff8880312f8000 RCX: ffff8880773e3c00 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffff888048428960 R08: 0000000000000000 R09: ffffffff820ff2c9 R10: dffffc0000000000 R11: ffffed100ee7c781 R12: 1ffff1100625f000 R13: 00000000014429c0 R14: dffffc0000000000 R15: ffffea0000000000 pte_offset_map_lock include/linux/mm.h:3029 [inline] follow_page_pte+0xc4/0x13e0 mm/gup.c:826 follow_pmd_mask mm/gup.c:-1 [inline] follow_pud_mask mm/gup.c:981 [inline] follow_p4d_mask mm/gup.c:998 [inline] follow_page_mask mm/gup.c:1041 [inline] __get_user_pages+0xa8e/0x2ce0 mm/gup.c:1444 populate_vma_page_range+0x29f/0x3a0 mm/gup.c:1880 __mm_populate+0x24c/0x380 mm/gup.c:1983 mm_populate include/linux/mm.h:3367 [inline] vm_mmap_pgoff+0x387/0x4d0 mm/util.c:585 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: 0033:0x7f977a18ebe9 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:00007f977b02f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f977a3c6180 RCX: 00007f977a18ebe9 RDX: 0000000000000003 RSI: 0000000000b36000 RDI: 0000200000000000 RBP: 00007f977a211e19 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000008031 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f977a3c6218 R14: 00007f977a3c6180 R15: 00007ffdacf85ac8 ---------------- Code disassembly (best guess): 0: 2c 2f sub $0x2f,%al 2: 48 83 c5 28 add $0x28,%rbp 6: 48 89 e8 mov %rbp,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14 14: fc ff df 17: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 1c: 74 08 je 0x26 1e: 48 89 ef mov %rbp,%rdi 21: e8 6e 22 13 00 call 0x132294 26: 48 8b 6d 00 mov 0x0(%rbp),%rbp * 2a: 48 89 ef mov %rbp,%rdi <-- trapping instruction 2d: e8 92 e0 6c 09 call 0x96ce0c4 32: 43 80 3c 34 00 cmpb $0x0,(%r12,%r14,1) 37: 74 08 je 0x41 39: 48 89 df mov %rbx,%rdi 3c: e8 .byte 0xe8 3d: 53 push %rbx 3e: 22 13 and (%rbx),%dl