watchdog: BUG: soft lockup - CPU#1 stuck for 144s! [syz.9.4707:26712] Modules linked in: irq event stamp: 10963405 hardirqs last enabled at (10963404): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (10963405): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (10907166): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (10907166): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (10907166): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (10907169): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (10907169): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (10907169): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 26712 Comm: syz.9.4707 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:debug_lockdep_rcu_enabled+0x29/0x40 kernel/rcu/update.c:321 Code: 90 f3 0f 1e fa 31 c0 83 3d b3 57 70 04 00 74 1d 83 3d fa 88 70 04 00 74 14 65 48 8b 0d e8 d7 77 07 31 c0 83 b9 14 0b 00 00 00 <0f> 94 c0 c3 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc90000a08530 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffc90000a08601 RCX: ffff88803005bc80 RDX: ffffffff90a60e01 RSI: 0000000000000000 RDI: ffffc90000a08610 RBP: dffffc0000000000 R08: ffffc90000a08667 R09: 0000000000000000 R10: ffffc90000a08658 R11: fffff520001410cd R12: ffffc90000a08ff0 R13: ffffc90000a01000 R14: ffffc90000a08608 R15: ffffffff81760295 FS: 00007f552de246c0(0000) GS:ffff888125596000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c360a8f CR3: 000000005a73c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff1 DR7: 0000000000050602 Call Trace: rcu_read_unlock include/linux/rcupdate.h:879 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1a5d/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4459 [inline] slab_alloc_node mm/slub.c:4788 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4840 kmalloc_reserve net/core/skbuff.c:613 [inline] __alloc_skb+0x27d/0x7d0 net/core/skbuff.c:713 __netdev_alloc_skb+0xc1/0x810 net/core/skbuff.c:775 netdev_alloc_skb include/linux/skbuff.h:3485 [inline] dev_alloc_skb include/linux/skbuff.h:3498 [inline] hsr_init_skb+0xef/0x6e0 net/hsr/hsr_device.c:267 send_hsr_supervision_frame+0x143/0xcb0 net/hsr/hsr_device.c:316 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421 call_timer_fn+0x192/0x5a0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:vsnprintf+0x8e/0xee0 lib/vsprintf.c:2887 Code: 04 1e 4c 39 f0 4d 89 f4 49 f7 d4 48 c7 c1 ff ff ff ff 48 0f 43 c8 48 89 4c 24 20 4c 0f 43 e3 4c 89 f8 48 c1 e8 03 0f b6 04 10 <84> c0 0f 85 f0 0d 00 00 41 0f b6 1f 31 ff 89 de e8 9d 14 28 f6 85 RSP: 0018:ffffc90004d0e570 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: 000000007fffffff RCX: ffffc90084d0e83f RDX: dffffc0000000000 RSI: 000000007fffffff RDI: 000000007fffffff RBP: ffffc90004d0e6f0 R08: ffffc90004d0e677 R09: 0000000000000000 R10: ffffc90004d0e660 R11: fffff520009a1ccf R12: 000000007fffffff R13: dffffc0000000000 R14: ffffc90004d0e840 R15: ffffffff8bcd89a0 sprintf+0xe7/0x140 lib/vsprintf.c:3111 print_time kernel/printk/printk.c:1359 [inline] info_print_prefix+0x16b/0x360 kernel/printk/printk.c:1385 record_print_text+0x176/0x450 kernel/printk/printk.c:1434 printk_get_next_message+0x29c/0x880 kernel/printk/printk.c:3072 console_emit_next_record kernel/printk/printk.c:3137 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x501/0xb20 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479 _printk+0xdd/0x130 kernel/printk/printk.c:2504 validate_nla lib/nlattr.c:414 [inline] __nla_validate_parse+0x1774/0x2dc0 lib/nlattr.c:635 __nla_parse+0x40/0x60 lib/nlattr.c:732 __nlmsg_parse include/net/netlink.h:789 [inline] nlmsg_parse_deprecated include/net/netlink.h:830 [inline] rtnl_dellink+0x1ff/0x820 net/core/rtnetlink.c:3546 rtnetlink_rcv_msg+0x7d5/0xbe0 net/core/rtnetlink.c:6958 netlink_rcv_skb+0x232/0x4b0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x80f/0x9b0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa68/0xad0 net/socket.c:2592 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x1bd/0x2a0 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f552cf9bf79 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:00007f552de24028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f552d215fa0 RCX: 00007f552cf9bf79 RDX: 0000000000000000 RSI: 0000200000000600 RDI: 0000000000000044 RBP: 00007f552d0327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f552d216038 R14: 00007f552d215fa0 R15: 00007fff3fa2f218 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 26703 Comm: syz.2.4703 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:check_preemption_disabled+0x0/0xe0 lib/smp_processor_id.c:13 Code: c7 20 88 27 8c 48 c7 c6 60 88 27 8c eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 41 57 41 56 53 65 8b 05 57 c3 77 07 65 8b 0d 4c c3 77 07 f7 c1 RSP: 0018:ffffc90000007798 EFLAGS: 00000046 RAX: 0000607eda576638 RBX: ffffffff8e62c4c0 RCX: 000000008bcf5402 RDX: ffffffff81b1a2be RSI: ffffffff8c278860 RDI: ffffffff8c278820 RBP: ffffc90000007890 R08: ffffffff9a488e13 R09: 1ffffffff34911c2 R10: dffffc0000000000 R11: fffffbfff34911c3 R12: dffffc0000000000 R13: 0000000000000012 R14: ffffffff8e62c460 R15: 1ffff92000000efc FS: 00007f99b66ab6c0(0000) GS:ffff888125496000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f552de03d58 CR3: 00000000591aa000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0xf8/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:176 [inline] _raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:194 __run_hrtimer kernel/time/hrtimer.c:1781 [inline] __hrtimer_run_queues+0x40e/0xc30 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:call_timer_fn+0x2be/0x5a0 kernel/time/timer.c:1764 Code: 02 00 00 00 e8 93 8d 13 00 45 84 e4 0f 84 9b 02 00 00 e8 85 8a 13 00 48 b8 00 00 00 00 00 fc ff df 41 c7 44 06 04 f8 f8 f8 f8 <41> c6 44 06 08 f8 48 c7 44 24 20 0e 36 e0 45 49 c7 04 06 00 00 00 RSP: 0018:ffffc90000007ca0 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000101 RCX: ffff8880288b0000 RDX: 0000000000000100 RSI: 0000000000000101 RDI: 0000000000000101 RBP: ffffc90000007d90 R08: ffffffff81d05c52 R09: ffffffff8e7603e0 R10: 696f6a3e2d707061 R11: 2972656d69745f6e R12: 0000000000000000 R13: 00000001000206d6 R14: 1ffff92000000f98 R15: 0000000000000101 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x7c0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_is_held_type+0x106/0x150 kernel/locking/lockdep.c:5945 Code: 18 00 00 b8 ff ff ff ff 65 0f c1 05 04 20 78 07 83 f8 01 75 25 9c 58 a9 00 02 00 00 75 39 41 f7 c4 00 02 00 00 74 01 fb 89 d8 <5b> 41 5c 41 5d 41 5e 41 5f 5d e9 8b e1 02 00 cc 90 0f 0b 90 48 c7 RSP: 0018:ffffc9000ba66ce8 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000080000001 RDX: ffff8880288b0000 RSI: ffffffff8e15b390 RDI: ffffffff8c278880 RBP: 00000000ffffffff R08: ffffffff81d05c52 R09: ffffffff8e7603e0 R10: dffffc0000000000 R11: fffff91ffff54405 R12: 0000000000000246 R13: ffff8880288b0000 R14: ffffffff8e7603e0 R15: 0000000000000000 trace_call_bpf+0x1a6/0xb70 kernel/trace/bpf_trace.c:145 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11301 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x326/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2670 [inline] slab_free mm/slub.c:6082 [inline] kfree+0x1c1/0x610 mm/slub.c:6399 clear_jmp_history kernel/bpf/verifier.c:1683 [inline] free_verifier_state+0x197/0x230 kernel/bpf/verifier.c:1698 pop_stack kernel/bpf/verifier.c:2103 [inline] free_states kernel/bpf/verifier.c:24375 [inline] do_check_common+0x1ae9/0x25b0 kernel/bpf/verifier.c:24535 do_check_main kernel/bpf/verifier.c:24614 [inline] bpf_check+0x5f3d/0x1ce00 kernel/bpf/verifier.c:25939 bpf_prog_load+0x1484/0x1ae0 kernel/bpf/syscall.c:3089 __sys_bpf+0x618/0x950 kernel/bpf/syscall.c:6229 __do_sys_bpf kernel/bpf/syscall.c:6342 [inline] __se_sys_bpf kernel/bpf/syscall.c:6340 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6340 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f99b579bf79 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:00007f99b66ab028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f99b5a15fa0 RCX: 00007f99b579bf79 RDX: 0000000000000094 RSI: 0000200000000040 RDI: 0000000000000005 RBP: 00007f99b58327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f99b5a16038 R14: 00007f99b5a15fa0 R15: 00007ffcd94c7348