================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.1.1244/8763 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8c450238 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x84/0xb30 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+0x52a/0x930 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+0x2dd/0xbf0 net/core/dev.c:1323 do_setlink+0xa4e/0x3d60 net/core/rtnetlink.c:2765 __rtnl_newlink net/core/rtnetlink.c:3456 [inline] rtnl_newlink+0x1658/0x1a50 net/core/rtnetlink.c:3578 rtnetlink_rcv_msg+0x844/0xf30 net/core/rtnetlink.c:5688 netlink_rcv_skb+0x1f5/0x440 net/netlink/af_netlink.c:2507 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x774/0x920 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ba/0xbe0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] __sys_sendto+0x46d/0x620 net/socket.c:2072 __do_sys_sendto net/socket.c:2084 [inline] __se_sys_sendto net/socket.c:2080 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2080 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: 432 hardirqs last enabled at (431): [] __local_bh_enable_ip+0x136/0x1c0 kernel/softirq.c:406 hardirqs last disabled at (432): [] exc_debug_kernel arch/x86/kernel/traps.c:893 [inline] hardirqs last disabled at (432): [] exc_debug+0x6e/0x130 arch/x86/kernel/traps.c:1029 softirqs last enabled at (430): [] lock_sock include/net/sock.h:1744 [inline] softirqs last enabled at (430): [] rawv6_sendmsg+0x11d9/0x1700 net/ipv6/raw.c:953 softirqs last disabled at (428): [] spin_lock_bh include/linux/spinlock.h:369 [inline] softirqs last disabled at (428): [] lock_sock_nested+0x68/0x100 net/core/sock.c:3262 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(kernfs_rename_lock); lock(kernfs_rename_lock); *** DEADLOCK *** 1 lock held by syz.1.1244/8763: #0: ffff88805eda0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1744 [inline] #0: ffff88805eda0860 (sk_lock-AF_INET6){+.+.}-{0:0}, at: rawv6_sendmsg+0x11d9/0x1700 net/ipv6/raw.c:953 stack backtrace: CPU: 0 PID: 8763 Comm: syz.1.1244 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 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+0x84/0xb30 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+0x21/0xd10 bpf_dispatcher_nop_func include/linux/bpf.h:888 [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:10297 __perf_event_overflow+0x364/0x530 kernel/events/core.c:9515 perf_bp_event+0x276/0x320 kernel/events/core.c:10484 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: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:csum_partial_copy_generic+0x6f/0x1e0 arch/x86/lib/csum-copy_64.S:93 Code: 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 1f 4c 8b 47 08 4c 8b 5f 10 48 8b 57 18 4c 8b 57 20 4c 8b 7f 28 4c 8b 77 30 4c 8b 6f 38 <0f> 18 8f 40 01 00 00 48 11 d8 4c 11 c0 4c 11 d8 48 11 d0 4c 11 d0 RSP: 0018:ffffc900030cf238 EFLAGS: 00040202 RAX: 000000070000012e RBX: 0000000000000000 RCX: 0000000000000590 RDX: 0000000000000000 RSI: ffff88804f991258 RDI: 00002000000002c8 RBP: 00002000000006d8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000010 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 csum_and_copy_from_user+0xdf/0x120 arch/x86/lib/csum-wrappers_64.c:31 csum_and_copy_from_iter+0x247/0x1120 lib/iov_iter.c:1705 csum_and_copy_from_iter_full include/linux/uio.h:299 [inline] ip_generic_getfrag+0x14f/0x2d0 net/ipv4/ip_output.c:946 __ip6_append_data+0x2ada/0x38c0 net/ipv6/ip6_output.c:1636 ip6_append_data+0x1d4/0x310 net/ipv6/ip6_output.c:1769 rawv6_sendmsg+0x1222/0x1700 net/ipv6/raw.c:954 sock_sendmsg_nosec net/socket.c:706 [inline] __sock_sendmsg net/socket.c:718 [inline] ____sys_sendmsg+0x5b7/0x8f0 net/socket.c:2445 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2499 __sys_sendmsg net/socket.c:2528 [inline] __do_sys_sendmsg net/socket.c:2537 [inline] __se_sys_sendmsg+0x1af/0x290 net/socket.c:2535 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: 0033:0x7f0f6367ae59 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:00007f0f618d4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f0f638f3fa0 RCX: 00007f0f6367ae59 RDX: 0000000000000060 RSI: 0000200000000080 RDI: 0000000000000007 RBP: 00007f0f63710d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0f638f4038 R14: 00007f0f638f3fa0 R15: 00007ffefdf466f8 ---------------- Code disassembly (best guess): 0: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 7: 00 8: 0f 1f 00 nopl (%rax) b: 48 8b 1f mov (%rdi),%rbx e: 4c 8b 47 08 mov 0x8(%rdi),%r8 12: 4c 8b 5f 10 mov 0x10(%rdi),%r11 16: 48 8b 57 18 mov 0x18(%rdi),%rdx 1a: 4c 8b 57 20 mov 0x20(%rdi),%r10 1e: 4c 8b 7f 28 mov 0x28(%rdi),%r15 22: 4c 8b 77 30 mov 0x30(%rdi),%r14 26: 4c 8b 6f 38 mov 0x38(%rdi),%r13 * 2a: 0f 18 8f 40 01 00 00 prefetcht0 0x140(%rdi) <-- trapping instruction 31: 48 11 d8 adc %rbx,%rax 34: 4c 11 c0 adc %r8,%rax 37: 4c 11 d8 adc %r11,%rax 3a: 48 11 d0 adc %rdx,%rax 3d: 4c 11 d0 adc %r10,%rax