watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [migration/1:22] Modules linked in: irq event stamp: 22391007 hardirqs last enabled at (22391006): [] rcu_read_unlock_special+0x3ca/0x4c0 kernel/rcu/tree_plugin.h:690 hardirqs last disabled at (22391007): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (22390996): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (22390996): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (22390996): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (22390999): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (22390999): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (22390999): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 22 Comm: migration/1 Not tainted 6.16.0-rc6-syzkaller-g95993dc3039e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Stopper: 0x0 <- 0x0 RIP: 0010:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 62 2c f8 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000a088c0 EFLAGS: 00000206 RAX: 62c0af69d0974500 RBX: 1ffff92000141120 RCX: 62c0af69d0974500 RDX: 0000000000000000 RSI: ffffffff8d99882e RDI: ffffffff8be29f40 RBP: ffffc90000a089c0 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffffffff8e144400 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff888125d1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3120aff8 CR3: 000000007ccf0000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2258 [inline] bpf_trace_run1+0x31d/0x4b0 kernel/trace/bpf_trace.c:2297 __bpf_trace_rcu_utilization+0xa1/0xf0 include/trace/events/rcu.h:27 __do_trace_rcu_utilization include/trace/events/rcu.h:27 [inline] trace_rcu_utilization+0x1ad/0x1d0 include/trace/events/rcu.h:27 rcu_core+0x1336/0x1710 kernel/rcu/tree.c:2840 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:finish_task_switch+0x26b/0x950 kernel/sched/core.c:5265 Code: 0f 84 3c 01 00 00 48 85 db 0f 85 63 01 00 00 0f 1f 44 00 00 4c 8b 75 d0 4c 89 e7 e8 0f 1a df 09 e8 ba b9 35 00 fb 4c 8b 65 c0 <49> 8d bc 24 18 16 00 00 48 89 f8 48 c1 e8 03 42 0f b6 04 28 84 c0 RSP: 0018:ffffc900001c7a38 EFLAGS: 00000282 RAX: 62c0af69d0974500 RBX: 0000000000000000 RCX: 62c0af69d0974500 RDX: 0000000000000000 RSI: ffffffff8d99882e RDI: ffffffff8be29f40 RBP: ffffc900001c7a90 R08: ffffffff8fa1e8f7 R09: 1ffffffff1f43d1e R10: dffffc0000000000 R11: fffffbfff1f43d1f R12: ffff88801d6bbc00 R13: dffffc0000000000 R14: ffff8880312e0000 R15: ffff8880b873ab98 context_switch kernel/sched/core.c:5400 [inline] __schedule+0x16fd/0x4d00 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0x165/0x360 kernel/sched/core.c:6879 smpboot_thread_fn+0x5bd/0xa60 kernel/smpboot.c:160 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 3528 Comm: kworker/u8:6 Not tainted 6.16.0-rc6-syzkaller-g95993dc3039e #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:rcu_is_watching+0x70/0xb0 kernel/rcu/tree.c:747 Code: c3 98 3f a1 92 49 03 1e 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 75 34 8b 03 65 ff 0d 69 e3 f8 10 74 11 83 e0 04 c1 e8 02 5b <41> 5e 41 5f e9 c7 36 ca 09 cc e8 d1 79 8c ff eb e8 48 c7 c7 40 4e RSP: 0018:ffffc9000ca47138 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 0000000000000000 RCX: ae653b403bc6ed00 RDX: ffff888031938000 RSI: ffffffff8be29f20 RDI: ffffffff8be29ee0 RBP: ffffc9000ca47258 R08: ffffc9000ca471ef R09: 0000000000000000 R10: ffffc9000ca471e0 R11: fffff52001948e3e R12: 0000000000000001 R13: ffffc9000ca471e0 R14: ffffffff8dbbec70 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125c1f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffea1bc2f08 CR3: 0000000076cb8000 CR4: 00000000003526f0 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:109 [inline] rcu_read_lock_held+0x15/0x50 kernel/rcu/update.c:349 bpf_prog_run_array include/linux/bpf.h:2260 [inline] trace_call_bpf+0x1f4/0x850 kernel/trace/bpf_trace.c:146 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10891 do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0x335/0x410 include/trace/events/lock.h:24 __do_trace_lock_acquire include/trace/events/lock.h:24 [inline] trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x311/0x360 kernel/locking/lockdep.c:5834 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1336 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline] nsim_dev_trap_report_work+0x29a/0xb80 drivers/net/netdevsim/dev.c:851 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245