================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.6.4145/25244 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8c44fe18 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x84/0xb70 fs/kernfs/dir.c:224 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x400 kernel/locking/lockdep.c:5623 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:128 [inline] _raw_spin_lock_irq+0xab/0xf0 kernel/locking/spinlock.c:170 spin_lock_irq include/linux/spinlock.h:389 [inline] kernfs_rename_ns+0x531/0x970 fs/kernfs/dir.c:1629 sysfs_rename_link_ns+0x171/0x1b0 fs/sysfs/symlink.c:192 device_rename+0x11c/0x1a0 drivers/base/core.c:4294 dev_change_name+0x2ee/0xc10 net/core/dev.c:1323 do_setlink+0x9e7/0x29d0 net/core/rtnetlink.c:2773 __rtnl_newlink net/core/rtnetlink.c:3464 [inline] rtnl_newlink+0x15bb/0x1920 net/core/rtnetlink.c:3586 rtnetlink_rcv_msg+0x7f1/0xf10 net/core/rtnetlink.c:5698 netlink_rcv_skb+0x1e9/0x430 net/netlink/af_netlink.c:2519 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x78f/0x940 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2073 __do_sys_sendto net/socket.c:2085 [inline] __se_sys_sendto net/socket.c:2081 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2081 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 irq event stamp: 1104 hardirqs last enabled at (1103): [] kasan_quarantine_put+0xd4/0x210 mm/kasan/quarantine.c:231 hardirqs last disabled at (1104): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (1104): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (640): [] bpf_prog_load+0x10ee/0x14e0 kernel/bpf/syscall.c:2380 softirqs last disabled at (638): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (638): [] bpf_ksym_add+0x28/0x330 kernel/bpf/core.c:633 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(kernfs_rename_lock); lock(kernfs_rename_lock); *** DEADLOCK *** no locks held by syz.6.4145/25244. stack backtrace: CPU: 0 PID: 25244 Comm: syz.6.4145 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Call Trace: <#DB> dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106 lock_acquire+0x2c3/0x400 kernel/locking/lockdep.c:5614 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xb0/0x100 kernel/locking/spinlock.c:162 kernfs_path_from_node+0x84/0xb70 fs/kernfs/dir.c:224 kernfs_path include/linux/kernfs.h:547 [inline] cgroup_path include/linux/cgroup.h:663 [inline] get_mm_memcg_path+0xba/0x330 mm/mmap_lock.c:82 __mmap_lock_do_trace_start_locking+0xe2/0x2f0 mm/mmap_lock.c:95 __mmap_lock_trace_start_locking include/linux/mmap_lock.h:29 [inline] mmap_read_trylock include/linux/mmap_lock.h:135 [inline] stack_map_get_build_id_offset+0x562/0x860 kernel/bpf/stackmap.c:185 __bpf_get_stackid+0x55d/0x920 kernel/bpf/stackmap.c:294 bpf_prog_12712c88fd19bd5b+0x21/0xea0 bpf_dispatcher_nop_func include/linux/bpf.h:889 [inline] __bpf_prog_run include/linux/filter.h:628 [inline] bpf_prog_run include/linux/filter.h:635 [inline] bpf_overflow_handler+0x1c2/0x4a0 kernel/events/core.c:10307 __perf_event_overflow+0x35f/0x550 kernel/events/core.c:9525 perf_bp_event+0x276/0x320 kernel/events/core.c:10494 hw_breakpoint_handler arch/x86/kernel/hw_breakpoint.c:555 [inline] hw_breakpoint_exceptions_notify+0x14d/0x470 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain kernel/notifier.c:83 [inline] atomic_notifier_call_chain+0x15d/0x280 kernel/notifier.c:198 notify_die+0x141/0x1a0 kernel/notifier.c:529 notify_debug+0x20/0x30 arch/x86/kernel/traps.c:872 exc_debug_kernel arch/x86/kernel/traps.c:929 [inline] exc_debug+0xcf/0x130 arch/x86/kernel/traps.c:1029 asm_exc_debug+0x1a/0x40 arch/x86/include/asm/idtentry.h:642 RIP: 0010:__put_user_nocheck_1+0x5/0x11 Code: e8 21 14 6a fd 89 d8 5b 41 5e 41 5f 5d c3 00 00 cc cc 00 00 cc cc 48 bb 00 f0 ff ff ff 7f 00 00 48 39 d9 73 74 0f 01 cb 88 01 <31> c9 0f 01 ca c3 90 90 90 90 90 90 48 bb ff ef ff ff ff 7f 00 00 RSP: 0018:ffffc900031df560 EFLAGS: 00040287 RAX: 0000000000000000 RBX: 00007ffffffff000 RCX: 0000200000000300 RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a43c0 RBP: 0000000000000001 R08: ffffffff8d8b0eef R09: 1ffffffff1b161dd R10: dffffc0000000000 R11: fffffbfff1b161de R12: ffff88807bbdc000 R13: 1ffff1100f77b94e R14: dffffc0000000000 R15: ffff88807bbdca70 bpf_vlog_reset kernel/bpf/verifier.c:317 [inline] do_check_common+0x1166/0x16e0 kernel/bpf/verifier.c:13544 do_check_main kernel/bpf/verifier.c:13596 [inline] bpf_check+0x88c1/0xf6b0 kernel/bpf/verifier.c:14167 bpf_prog_load+0xfdf/0x14e0 kernel/bpf/syscall.c:2354 __sys_bpf+0x532/0x6f0 kernel/bpf/syscall.c:4657 __do_sys_bpf kernel/bpf/syscall.c:4761 [inline] __se_sys_bpf kernel/bpf/syscall.c:4759 [inline] __x64_sys_bpf+0x78/0x90 kernel/bpf/syscall.c:4759 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f751f301159 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:00007f751d559028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f751f588fa0 RCX: 00007f751f301159 RDX: 0000000000000070 RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007f751f398024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f751f589038 R14: 00007f751f588fa0 R15: 00007ffc914d79b8 ---------------- Code disassembly (best guess): 0: e8 21 14 6a fd call 0xfd6a1426 5: 89 d8 mov %ebx,%eax 7: 5b pop %rbx 8: 41 5e pop %r14 a: 41 5f pop %r15 c: 5d pop %rbp d: c3 ret e: 00 00 add %al,(%rax) 10: cc int3 11: cc int3 12: 00 00 add %al,(%rax) 14: cc int3 15: cc int3 16: 48 bb 00 f0 ff ff ff movabs $0x7ffffffff000,%rbx 1d: 7f 00 00 20: 48 39 d9 cmp %rbx,%rcx 23: 73 74 jae 0x99 25: 0f 01 cb stac 28: 88 01 mov %al,(%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: 48 bb ff ef ff ff ff movabs $0x7fffffffefff,%rbx 3d: 7f 00 00