================================ WARNING: inconsistent lock state syzkaller #0 Not tainted -------------------------------- inconsistent {INITIAL USE} -> {IN-NMI} usage. syz.0.840/8599 [HC1[1]:SC0[0]:HE0:SE1] takes: ffffffff8d297c78 (kernfs_rename_lock){....}-{2:2}, at: kernfs_path_from_node+0x89/0xbb0 fs/kernfs/dir.c:229 {INITIAL USE} state was registered at: lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0xaf/0xf0 kernel/locking/spinlock.c:326 kernfs_rename_ns+0x5d0/0x810 fs/kernfs/dir.c:1762 sysfs_rename_link_ns+0x175/0x1b0 fs/sysfs/symlink.c:192 device_rename+0x110/0x1e0 drivers/base/core.c:4597 dev_change_name+0x307/0x8c0 net/core/dev.c:1291 do_setlink+0x9fc/0x4130 net/core/rtnetlink.c:2889 __rtnl_newlink net/core/rtnetlink.c:3707 [inline] rtnl_newlink+0x17da/0x20a0 net/core/rtnetlink.c:3754 rtnetlink_rcv_msg+0x869/0xfa0 net/core/rtnetlink.c:6476 netlink_rcv_skb+0x241/0x4d0 net/netlink/af_netlink.c:2545 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x4a9/0x6b0 net/socket.c:2200 __do_sys_sendto net/socket.c:2212 [inline] __se_sys_sendto net/socket.c:2208 [inline] __x64_sys_sendto+0xde/0xf0 net/socket.c:2208 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 irq event stamp: 204 hardirqs last enabled at (203): [] do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:82 hardirqs last disabled at (204): [] exc_debug_user arch/x86/kernel/traps.c:1142 [inline] hardirqs last disabled at (204): [] noist_exc_debug+0x4d/0x120 arch/x86/kernel/traps.c:1205 softirqs last enabled at (0): [] rcu_lock_acquire include/linux/rcupdate.h:334 [inline] softirqs last enabled at (0): [] rcu_read_lock include/linux/rcupdate.h:786 [inline] softirqs last enabled at (0): [] copy_process+0x96e/0x3dc0 kernel/fork.c:2372 softirqs last disabled at (0): [<0000000000000000>] 0x0 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(kernfs_rename_lock); lock(kernfs_rename_lock); *** DEADLOCK *** 2 locks held by syz.0.840/8599: #0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #0: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: atomic_notifier_call_chain+0x26/0x180 kernel/notifier.c:230 #1: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline] #1: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline] #1: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: __perf_event_output kernel/events/core.c:7972 [inline] #1: ffffffff8d132160 (rcu_read_lock){....}-{1:2}, at: perf_event_output_forward+0xb9/0x3e0 kernel/events/core.c:7995 stack backtrace: CPU: 0 PID: 8599 Comm: syz.0.840 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Call Trace: <#DB> dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 lock_acquire+0x2c2/0x420 kernel/locking/lockdep.c:5745 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0xbc/0x100 kernel/locking/spinlock.c:236 kernfs_path_from_node+0x89/0xbb0 fs/kernfs/dir.c:229 kernfs_path include/linux/kernfs.h:597 [inline] cgroup_path include/linux/cgroup.h:601 [inline] get_mm_memcg_path+0xb9/0x360 mm/mmap_lock.c:82 __mmap_lock_do_trace_start_locking+0xe6/0x2f0 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:164 [inline] stack_map_get_build_id_offset+0x5cd/0x720 kernel/bpf/stackmap.c:141 __bpf_get_stackid+0x55c/0x900 kernel/bpf/stackmap.c:247 bpf_prog_12712c88fd19bd5b+0x29/0x2d bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline] __bpf_prog_run include/linux/filter.h:616 [inline] bpf_prog_run include/linux/filter.h:623 [inline] bpf_overflow_handler+0x1fc/0x510 kernel/events/core.c:10584 __perf_event_overflow+0x447/0x630 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+0x2fb/0x670 arch/x86/kernel/hw_breakpoint.c:586 notifier_call_chain+0x197/0x380 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:__get_user_nocheck_8+0xd/0x20 arch/x86/lib/getuser.S:143 Code: fa 0f 01 cb 0f ae e8 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 01 cb 0f ae e8 48 8b 10 <31> c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 ca RSP: 0000:ffffc9000c51f558 EFLAGS: 00040802 RAX: 0000200000000300 RBX: 00000000ffffffff RCX: 1ffff920018a3eca RDX: 00006370692f736e RSI: 0000200000000300 RDI: 0000000000000000 RBP: 0000200000000300 R08: 000000000000007f R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff2239aa1 R12: 0000000000000001 R13: 1ffff920018a3ec8 R14: 000000000000007f R15: dffffc0000000000 perf_callchain_user+0xbe4/0x15c0 arch/x86/events/core.c:2957 get_perf_callchain+0x394/0x510 kernel/events/callchain.c:219 perf_callchain kernel/events/core.c:7742 [inline] perf_sample_save_callchain include/linux/perf_event.h:1232 [inline] perf_prepare_sample+0x3c7/0x1df0 kernel/events/core.c:7786 __perf_event_output kernel/events/core.c:7974 [inline] perf_event_output_forward+0x187/0x3e0 kernel/events/core.c:7995 __perf_event_overflow+0x447/0x630 kernel/events/core.c:9720 perf_swevent_overflow+0x268/0x340 kernel/events/core.c:9803 perf_swevent_event+0x45c/0x570 kernel/events/core.c:-1 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+0x197/0x380 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 RIP: 0033:0x7f98c1f7bbfd Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 89 f8 48 89 fa c5 f9 ef c0 25 ff 0f 00 00 3d e0 0f 00 00 0f 87 27 01 00 00 c5 fd 74 0f fd d7 c1 85 c0 74 5b f3 0f bc c0 e9 30 01 00 00 66 90 f3 0f bc RSP: 002b:00007f98c2f0f8a8 EFLAGS: 00000283 RAX: 0000000000000300 RBX: 00007f98c2f0fde0 RCX: 2f666c65732f636f RDX: 0000200000000300 RSI: 00007f98c205d140 RDI: 0000200000000300 RBP: 0000200000000300 R08: 00007f98c2f10010 R09: 00000000ffffffff R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000073 R14: 00007f98c20320dd R15: 00007f98c2f0fea0 ---------------- Code disassembly (best guess): 0: fa cli 1: 0f 01 cb stac 4: 0f ae e8 lfence 7: 8b 10 mov (%rax),%edx 9: 31 c0 xor %eax,%eax b: 0f 01 ca clac e: c3 ret f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: f3 0f 1e fa endbr64 21: 0f 01 cb stac 24: 0f ae e8 lfence 27: 48 8b 10 mov (%rax),%rdx * 2a: 31 c0 xor %eax,%eax <-- 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: 90 nop 38: 90 nop 39: 90 nop 3a: 90 nop 3b: 90 nop 3c: 90 nop 3d: 0f 01 ca clac