================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.1.2624/16391 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff88805dc7a9a0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5790 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x19f/0x640 kernel/bpf/hashtab.c:1478 bpf_prog_a8e63e838209a5e2+0x49/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1226 [inline] __bpf_prog_run include/linux/filter.h:617 [inline] bpf_prog_run include/linux/filter.h:624 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720 perf_swevent_overflow kernel/events/core.c:9803 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9854 perf_bp_event+0x319/0x430 kernel/events/core.c:10781 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain+0x18f/0x380 kernel/notifier.c:93 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231 notify_die+0x145/0x1a0 kernel/notifier.c:596 notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042 exc_debug_user arch/x86/kernel/traps.c:1168 [inline] noist_exc_debug+0x77/0x120 arch/x86/kernel/traps.c:1205 asm_exc_debug+0x33/0x40 arch/x86/include/asm/idtentry.h:644 irq event stamp: 1278 hardirqs last enabled at (1277): [] syscall_enter_from_user_mode+0x25/0x80 kernel/entry/common.c:120 hardirqs last disabled at (1278): [] exc_debug_kernel arch/x86/kernel/traps.c:1063 [inline] hardirqs last disabled at (1278): [] exc_debug+0x73/0x140 arch/x86/kernel/traps.c:1199 softirqs last enabled at (950): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (950): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (950): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (933): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (933): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (933): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key); lock(&htab->lockdep_key); *** DEADLOCK *** no locks held by syz.1.2624/16391. stack backtrace: CPU: 1 PID: 16391 Comm: syz.1.2624 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026 Call Trace: <#DB> dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lock_acquire+0x2c2/0x420 kernel/locking/lockdep.c:5781 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x19f/0x640 kernel/bpf/hashtab.c:1478 bpf_prog_a8e63e838209a5e2+0x49/0x4b bpf_dispatcher_nop_func include/linux/bpf.h:1226 [inline] __bpf_prog_run include/linux/filter.h:617 [inline] bpf_prog_run include/linux/filter.h:624 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x461/0x660 kernel/events/core.c:9720 perf_swevent_overflow kernel/events/core.c:9803 [inline] perf_swevent_event+0x319/0x570 kernel/events/core.c:9854 perf_bp_event+0x319/0x430 kernel/events/core.c:10781 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x23e/0x670 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain+0x18f/0x380 kernel/notifier.c:93 atomic_notifier_call_chain+0xda/0x180 kernel/notifier.c:231 notify_die+0x145/0x1a0 kernel/notifier.c:596 notify_debug+0x2e/0x50 arch/x86/kernel/traps.c:1042 exc_debug_kernel arch/x86/kernel/traps.c:1099 [inline] exc_debug+0xde/0x140 arch/x86/kernel/traps.c:1199 asm_exc_debug+0x1e/0x40 arch/x86/include/asm/idtentry.h:644 RIP: 0010:__put_user_4+0x13/0x20 arch/x86/lib/putuser.S:90 Code: c3 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb 66 89 01 31 c9 0f 01 ca c3 f3 0f 1e fa 48 89 cb 48 c1 fb 3f 48 09 d9 0f 01 cb 89 01 <31> c9 0f 01 ca c3 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb 89 01 RSP: 0018:ffffc90004ad7e80 EFLAGS: 00040206 RAX: 000000000000000a RBX: 0000000000000000 RCX: 0000200000000300 RDX: 0000000000000000 RSI: ffffffff8acade60 RDI: ffffffff8b1d4020 RBP: 000000000000000a R08: ffffffff8e8c626f R09: 1ffffffff1d18c4d R10: dffffc0000000000 R11: fffffbfff1d18c4e R12: 0000000000000000 R13: 0000200000000300 R14: 0000000000000001 R15: 0000000000000001 __sys_socketpair+0xb8/0x550 net/socket.c:1765 __do_sys_socketpair net/socket.c:1831 [inline] __se_sys_socketpair net/socket.c:1828 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1828 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f0846f9e159 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0847df4028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f0847225fa0 RCX: 00007f0846f9e159 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000001 RBP: 00007f084703506b R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000300 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0847226038 R14: 00007f0847225fa0 R15: 00007ffe9288cb98 ---------------- Code disassembly (best guess): 0: c3 ret 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 90 nop 7: f3 0f 1e fa endbr64 b: 0f 01 cb stac e: 66 89 01 mov %ax,(%rcx) 11: 31 c9 xor %ecx,%ecx 13: 0f 01 ca clac 16: c3 ret 17: f3 0f 1e fa endbr64 1b: 48 89 cb mov %rcx,%rbx 1e: 48 c1 fb 3f sar $0x3f,%rbx 22: 48 09 d9 or %rbx,%rcx 25: 0f 01 cb stac 28: 89 01 mov %eax,(%rcx) * 2a: 31 c9 xor %ecx,%ecx <-- trapping instruction 2c: 0f 01 ca clac 2f: c3 ret 30: 90 nop 31: 90 nop 32: 90 nop 33: 90 nop 34: 90 nop 35: 90 nop 36: 90 nop 37: f3 0f 1e fa endbr64 3b: 0f 01 cb stac 3e: 89 01 mov %eax,(%rcx)