================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.3.4363/19329 [HC1[1]:SC0[0]:HE0:SE1] takes: ffff888073e877a0 (&htab->lockdep_key){....}-{2:2}, at: htab_lock_bucket+0x179/0x2f0 kernel/bpf/hashtab.c:166 {INITIAL USE} state was registered at: lock_acquire+0x1bb/0x4a0 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+0x179/0x2f0 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x1ad/0x780 kernel/bpf/hashtab.c:1438 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x6e8/0x7c0 kernel/events/core.c:10321 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9579 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9630 perf_bp_event+0x312/0x3f0 kernel/events/core.c:10518 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+0x141/0x1a0 kernel/notifier.c:593 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:1018 exc_debug_user arch/x86/kernel/traps.c:1144 [inline] noist_exc_debug+0x73/0x120 arch/x86/kernel/traps.c:1181 asm_exc_debug+0x2f/0x40 arch/x86/include/asm/idtentry.h:648 irq event stamp: 1714 hardirqs last enabled at (1713): [] kasan_quarantine_put+0xd4/0x220 mm/kasan/quarantine.c:242 hardirqs last disabled at (1714): [] exc_debug_kernel arch/x86/kernel/traps.c:1039 [inline] hardirqs last disabled at (1714): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1175 softirqs last enabled at (1616): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last enabled at (1616): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last enabled at (1616): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 softirqs last disabled at (1599): [] __do_softirq kernel/softirq.c:630 [inline] softirqs last disabled at (1599): [] invoke_softirq kernel/softirq.c:470 [inline] softirqs last disabled at (1599): [] __irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&htab->lockdep_key); lock(&htab->lockdep_key); *** DEADLOCK *** 1 lock held by syz.3.4363/19329: #0: ffff888045958a30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1805 [inline] #0: ffff888045958a30 (sk_lock-AF_INET6){+.+.}-{0:0}, at: sctp_sendmsg+0xa7c/0x2940 net/sctp/socket.c:1967 stack backtrace: CPU: 1 PID: 19329 Comm: syz.3.4363 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106 lock_acquire+0x2df/0x4a0 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+0x179/0x2f0 kernel/bpf/hashtab.c:166 htab_lru_map_delete_elem+0x1ad/0x780 kernel/bpf/hashtab.c:1438 bpf_prog_2c29ac5cdc6b1842+0x3a/0x3e bpf_dispatcher_nop_func include/linux/bpf.h:1012 [inline] __bpf_prog_run include/linux/filter.h:596 [inline] bpf_prog_run include/linux/filter.h:614 [inline] bpf_overflow_handler+0x6e8/0x7c0 kernel/events/core.c:10321 __perf_event_overflow+0x448/0x610 kernel/events/core.c:9496 perf_swevent_overflow kernel/events/core.c:9579 [inline] perf_swevent_event+0x315/0x570 kernel/events/core.c:9630 perf_bp_event+0x312/0x3f0 kernel/events/core.c:10518 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+0x141/0x1a0 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_short_string+0x24/0x40 arch/x86/lib/copy_user_64.S:243 Code: 90 90 90 90 90 90 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 48 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 <88> 07 48 ff c6 48 ff c7 ff c9 75 f2 31 c0 0f 01 ca c3 8d 14 ca eb RSP: 0018:ffffc9000519f3c8 EFLAGS: 00040202 RAX: ffffffff840f3860 RBX: 0000000000000001 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000200000000300 RDI: ffff888049b49c10 RBP: 0000000000000000 R08: ffff888049b49c10 R09: 1ffff11009369382 R10: dffffc0000000000 R11: ffffed1009369383 R12: 00007fffffffefff R13: 0000000000000000 R14: 0000200000000300 R15: ffff888049b49c10 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] copyin+0xe7/0x120 lib/iov_iter.c:183 _copy_from_iter+0x447/0x1130 lib/iov_iter.c:631 copy_from_iter include/linux/uio.h:187 [inline] copy_from_iter_full include/linux/uio.h:194 [inline] sctp_user_addto_chunk+0x8b/0x220 net/sctp/sm_make_chunk.c:1566 sctp_datamsg_from_user+0x73d/0xee0 net/sctp/chunk.c:269 sctp_sendmsg_to_asoc+0x107b/0x1830 net/sctp/socket.c:1856 sctp_sendmsg+0x1984/0x2940 net/sctp/socket.c:2028 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] ____sys_sendmsg+0x5be/0x970 net/socket.c:2518 ___sys_sendmsg+0x2a2/0x360 net/socket.c:2572 __sys_sendmsg net/socket.c:2601 [inline] __do_sys_sendmsg net/socket.c:2610 [inline] __se_sys_sendmsg+0x1bb/0x2a0 net/socket.c:2608 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f5099f9cdd9 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:00007f50981f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f509a216090 RCX: 00007f5099f9cdd9 RDX: 0000000000000000 RSI: 0000200000000280 RDI: 0000000000000010 RBP: 00007f509a032d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f509a216128 R14: 00007f509a216090 R15: 00007ffe6d5785a8 ---------------- Code disassembly (best guess): 0: 90 nop 1: 90 nop 2: 90 nop 3: 90 nop 4: 90 nop 5: 90 nop 6: 89 d1 mov %edx,%ecx 8: 83 e2 07 and $0x7,%edx b: c1 e9 03 shr $0x3,%ecx e: 74 12 je 0x22 10: 4c 8b 06 mov (%rsi),%r8 13: 4c 89 07 mov %r8,(%rdi) 16: 48 8d 76 08 lea 0x8(%rsi),%rsi 1a: 48 8d 7f 08 lea 0x8(%rdi),%rdi 1e: ff c9 dec %ecx 20: 75 ee jne 0x10 22: 21 d2 and %edx,%edx 24: 74 10 je 0x36 26: 89 d1 mov %edx,%ecx 28: 8a 06 mov (%rsi),%al * 2a: 88 07 mov %al,(%rdi) <-- trapping instruction 2c: 48 ff c6 inc %rsi 2f: 48 ff c7 inc %rdi 32: ff c9 dec %ecx 34: 75 f2 jne 0x28 36: 31 c0 xor %eax,%eax 38: 0f 01 ca clac 3b: c3 ret 3c: 8d 14 ca lea (%rdx,%rcx,8),%edx 3f: eb .byte 0xeb