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charset="UTF-8" syzbot ci has tested the following series [v1] Signed-off-by: Biancaa Ramesh https://lore.kernel.org/all/20251022172045.57132-1-biancaa2210329@ssn.edu.in * [PATCH] Signed-off-by: Biancaa Ramesh and found the following issue: inconsistent lock state in valid_state Full report is available here: https://ci.syzbot.org/series/633a22d7-da77-4e0d-b8b2-b83308d1ada4 *** inconsistent lock state in valid_state tree: net-next URL: https://kernel.googlesource.com/pub/scm/linux/kernel/git/netdev/net-next.git base: 3ff9bcecce83f12169ab3e42671bd76554ca521a arch: amd64 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 config: https://ci.syzbot.org/builds/fdd7ef69-8bca-4916-9206-338917b91147/config C repro: https://ci.syzbot.org/findings/5f542249-1f70-4702-b6c1-a89d7087a30c/c_repro syz repro: https://ci.syzbot.org/findings/5f542249-1f70-4702-b6c1-a89d7087a30c/syz_repro ================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {SOFTIRQ-ON-W} -> {IN-SOFTIRQ-W} usage. swapper/0/0 [HC0[0]:SC1[1]:HE1:SE0] takes: ffff888114c211e0 (slock-AF_LLC){+.?.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline] ffff888114c211e0 (slock-AF_LLC){+.?.}-{3:3}, at: llc_conn_tmr_common_cb+0x3d/0x830 net/llc/llc_c_ac.c:1325 {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] llc_conn_state_process+0xb1/0x1390 net/llc/llc_conn.c:72 llc_establish_connection+0x334/0x4d0 net/llc/llc_if.c:113 llc_ui_connect+0x3a0/0xd30 net/llc/af_llc.c:511 __sys_connect_file net/socket.c:2102 [inline] __sys_connect+0x316/0x440 net/socket.c:2121 __do_sys_connect net/socket.c:2127 [inline] __se_sys_connect net/socket.c:2124 [inline] __x64_sys_connect+0x7a/0x90 net/socket.c:2124 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f irq event stamp: 874834 hardirqs last enabled at (874834): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (874834): [] _raw_spin_unlock_irqrestore+0x85/0x110 kernel/locking/spinlock.c:194 hardirqs last disabled at (874833): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (874833): [] _raw_spin_lock_irqsave+0x82/0xf0 kernel/locking/spinlock.c:162 softirqs last enabled at (874680): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (874680): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (874680): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (874827): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (874827): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (874827): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(slock-AF_LLC); lock(slock-AF_LLC); *** DEADLOCK *** 1 lock held by swapper/0/0: #0: ffffc90000007be0 ((&llc->ack_timer.timer)){+.-.}-{0:0}, at: call_timer_fn+0xbe/0x5f0 kernel/time/timer.c:1744 stack backtrace: CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 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] llc_conn_tmr_common_cb+0x3d/0x830 net/llc/llc_c_ac.c:1325 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+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d 33 c1 22 00 f3 0f 1e fa fb f4 c8 e6 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff8dc07d80 EFLAGS: 00000286 RAX: cf42be3493bb8800 RBX: ffffffff81967c07 RCX: cf42be3493bb8800 RDX: 0000000000000001 RSI: ffffffff8d70c034 RDI: ffffffff8bbf0860 RBP: ffffffff8dc07ea8 R08: ffff888121232fdb R09: 1ffff110242465fb R10: dffffc0000000000 R11: ffffed10242465fc R12: ffffffff8f7ce370 R13: 0000000000000000 R14: 0000000000000000 R15: 1ffffffff1b92a40 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x73/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1e7/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428 rest_init+0x2de/0x300 init/main.c:757 start_kernel+0x3ae/0x410 init/main.c:1111 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x147 ---------------- Code disassembly (best guess): 0: cc int3 1: cc int3 2: cc int3 3: cc int3 4: cc int3 5: cc int3 6: cc int3 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: f3 0f 1e fa endbr64 1b: eb 07 jmp 0x24 1d: 0f 00 2d 33 c1 22 00 verw 0x22c133(%rip) # 0x22c157 24: f3 0f 1e fa endbr64 28: fb sti 29: f4 hlt * 2a: e9 c8 e6 02 00 jmp 0x2e6f7 <-- trapping instruction 2f: cc int3 30: cc int3 31: cc int3 32: cc int3 33: cc int3 34: cc int3 35: cc int3 36: cc int3 37: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 90 nop 3e: 90 nop 3f: 90 nop *** If these findings have caused you to resend the series or submit a separate fix, please add the following tag to your commit message: Tested-by: syzbot@syzkaller.appspotmail.com --- This report is generated by a bot. It may contain errors. syzbot ci engineers can be reached at syzkaller@googlegroups.com.