================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.34/4435 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888018a99820 (&htab->lockdep_key#3){....}-{2:2}, at: htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 __htab_percpu_map_update_elem+0x1d7/0x6f0 kernel/bpf/hashtab.c:1272 bpf_percpu_hash_update+0x133/0x200 kernel/bpf/hashtab.c:2339 bpf_map_update_value+0x310/0x670 kernel/bpf/syscall.c:202 map_update_elem+0x4d7/0x680 kernel/bpf/syscall.c:1473 __sys_bpf+0x454/0x6d0 kernel/bpf/syscall.c:5015 __do_sys_bpf kernel/bpf/syscall.c:5131 [inline] __se_sys_bpf kernel/bpf/syscall.c:5129 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5129 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 irq event stamp: 2486 hardirqs last enabled at (2485): [] exc_debug_kernel arch/x86/kernel/traps.c:1093 [inline] hardirqs last enabled at (2485): [] exc_debug+0xf0/0x130 arch/x86/kernel/traps.c:1175 hardirqs last disabled at (2486): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (2486): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (2468): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (2468): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (2468): [] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679 softirqs last disabled at (2411): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (2411): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (2411): [] __irq_exit_rcu+0x12f/0x220 kernel/softirq.c:679 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key#3); lock(&htab->lockdep_key#3); *** DEADLOCK *** no locks held by syz.0.34/4435. stack backtrace: CPU: 0 PID: 4435 Comm: syz.0.34 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: <#DB> dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 lock_acquire+0x2ce/0x490 kernel/locking/lockdep.c:5653 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 htab_lock_bucket+0x17d/0x300 kernel/bpf/hashtab.c:166 htab_map_delete_elem+0x19e/0x5b0 kernel/bpf/hashtab.c:1402 bpf_prog_653fb3e4a9309dc2+0x42/0x46 bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:603 [inline] bpf_prog_run include/linux/filter.h:610 [inline] bpf_overflow_handler+0x525/0x7b0 kernel/events/core.c:10286 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9572 [inline] perf_swevent_event+0x4ad/0x530 kernel/events/core.c:9610 perf_bp_event+0x23a/0x2a0 kernel/events/core.c:10478 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x152/0x470 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:87 [inline] atomic_notifier_call_chain+0x17a/0x2b0 kernel/notifier.c:225 notify_die+0x12d/0x180 kernel/notifier.c:593 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018 exc_debug_kernel arch/x86/kernel/traps.c:1075 [inline] exc_debug+0xd9/0x130 arch/x86/kernel/traps.c:1175 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:648 RIP: 0010:copy_user_enhanced_fast_string+0xa/0x40 arch/x86/lib/copy_user_64.S:166 Code: ff c9 75 f2 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 8d 0c ca 89 ca eb 20 0f 01 cb 83 fa 40 72 38 89 d1 a4 31 c0 0f 01 ca c3 89 ca eb 0a 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc900032a7d48 EFLAGS: 00050206 RAX: ffffffff84072901 RBX: 0000000000000090 RCX: 000000000000000d RDX: 0000000000000090 RSI: 0000200000000303 RDI: ffffc900032a7e43 RBP: 0000000000000000 R08: dffffc0000000000 R09: fffff52000654fca R10: 0000000000000000 R11: 0000000000000010 R12: 00007fffffffef70 R13: 0000000000000090 R14: ffffc900032a7dc0 R15: 0000200000000280 copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:52 [inline] _copy_from_user+0xf4/0x170 lib/usercopy.c:23 copy_from_user include/linux/uaccess.h:161 [inline] copy_from_bpfptr_offset include/linux/bpfptr.h:53 [inline] copy_from_bpfptr include/linux/bpfptr.h:59 [inline] __sys_bpf+0x265/0x6d0 kernel/bpf/syscall.c:5000 __do_sys_bpf kernel/bpf/syscall.c:5131 [inline] __se_sys_bpf kernel/bpf/syscall.c:5129 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:5129 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff07418f749 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:00007ffcf6daefe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007ff0743e5fa0 RCX: 00007ff07418f749 RDX: 0000000000000094 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007ff074213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff0743e5fa0 R14: 00007ff0743e5fa0 R15: 0000000000000003 ---------------- Code disassembly (best guess): 0: ff c9 dec %ecx 2: 75 f2 jne 0xfffffff6 4: 89 d1 mov %edx,%ecx 6: c1 e9 03 shr $0x3,%ecx 9: 83 e2 07 and $0x7,%edx c: f3 48 a5 rep movsq %ds:(%rsi),%es:(%rdi) f: 89 d1 mov %edx,%ecx 11: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) 13: 31 c0 xor %eax,%eax 15: 0f 01 ca clac 18: c3 ret 19: 8d 0c ca lea (%rdx,%rcx,8),%ecx 1c: 89 ca mov %ecx,%edx 1e: eb 20 jmp 0x40 20: 0f 01 cb stac 23: 83 fa 40 cmp $0x40,%edx 26: 72 38 jb 0x60 28: 89 d1 mov %edx,%ecx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: 0f 01 ca clac 31: c3 ret 32: 89 ca mov %ecx,%edx 34: eb 0a jmp 0x40 36: 90 nop 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