RBP: 0000000000000001 R08: 00007fffb38beb58 R09: 0000000000000000 R10: 00007fffb38be9f0 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f0ea8d70680 R15: 00007f0ea8d72000 watchdog: BUG: soft lockup - CPU#1 stuck for 225s! [modprobe:19161] Modules linked in: irq event stamp: 612894 hardirqs last enabled at (612893): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (612893): [] irqentry_exit_to_kernel_mode include/linux/irq-entry-common.h:542 [inline] hardirqs last enabled at (612893): [] irqentry_exit+0x24d/0x970 kernel/entry/common.c:164 hardirqs last disabled at (612894): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1061 softirqs last enabled at (612892): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (612892): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (612892): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 softirqs last disabled at (612861): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (612861): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (612861): [] __irq_exit_rcu+0x162/0x210 kernel/softirq.c:735 CPU: 1 UID: 0 PID: 19161 Comm: modprobe Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0x58e/0x1700 kernel/smp.c:892 Code: 00 fc ff df 48 8b 54 24 08 49 89 d5 49 89 d4 49 c1 ed 03 41 83 e4 07 49 01 c5 41 83 c4 03 e8 29 84 0c 00 f3 90 41 0f b6 45 00 <41> 38 c4 7c 08 84 c0 0f 85 63 0f 00 00 8b 45 08 31 ff 83 e0 01 41 RSP: 0018:ffffc900057778a8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff81fbfb3d RDX: ffff8880513e3e00 RSI: ffffffff81fbfb17 RDI: ffff8880513e3e00 RBP: ffff8880b84431c0 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000003 R13: ffffed1017088639 R14: 0000000000000001 R15: ffff8880b853c740 FS: 0000000000000000(0000) GS:ffff888124484000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa241d456b8 CR3: 000000006af6f000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1057 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x45f/0x16f0 arch/x86/mm/tlb.c:1451 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:499 [inline] tlb_flush_mmu mm/mmu_gather.c:423 [inline] tlb_finish_mmu+0x3fe/0x810 mm/mmu_gather.c:549 exit_mmap+0x454/0xa10 mm/mmap.c:1313 __mmput+0x12a/0x410 kernel/fork.c:1178 mmput+0x67/0x80 kernel/fork.c:1201 exit_mm kernel/exit.c:582 [inline] do_exit+0x8b2/0x2af0 kernel/exit.c:964 do_group_exit+0xd5/0x2a0 kernel/exit.c:1119 __do_sys_exit_group kernel/exit.c:1130 [inline] __se_sys_exit_group kernel/exit.c:1128 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1128 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0ea8c706c5 Code: Unable to access opcode bytes at 0x7f0ea8c7069b. RSP: 002b:00007fffb38bebc8 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 00007f0ea8d71fe8 RCX: 00007f0ea8c706c5 RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001 RBP: 0000000000000001 R08: 00007fffb38beb58 R09: 0000000000000000 R10: 00007fffb38be9f0 R11: 0000000000000202 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f0ea8d70680 R15: 00007f0ea8d72000 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6638 Comm: kworker/u8:11 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 Workqueue: events_unbound nsim_dev_trap_report_work RIP: 0010:__rb_erase_augmented include/linux/rbtree_augmented.h:243 [inline] RIP: 0010:rb_erase+0x892/0x12e0 lib/rbtree.c:443 Code: fc ff df 48 89 ca 48 c1 ea 03 80 3c 02 00 0f 85 fd 09 00 00 4c 89 39 e9 e2 f9 ff ff 48 89 68 10 e9 57 fd ff ff 49 89 6c 24 10 <48> 85 ed 0f 85 06 fe ff ff 83 e3 01 0f 84 c2 f9 ff ff 48 b8 00 00 RSP: 0018:ffffc90000007dc0 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffff88807c503000 RCX: ffff8880b8428658 RDX: 1ffff1100f8a0602 RSI: ffff8880b8428658 RDI: ffff88807c503010 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000001 R12: ffff88807c503000 R13: ffff8880b8428660 R14: ffff888054804300 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888124384000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ea8b40a10 CR3: 00000000352c8000 CR4: 0000000000350ef0 Call Trace: rb_erase_linked+0xc7/0x190 lib/rbtree.c:459 timerqueue_linked_del include/linux/timerqueue.h:66 [inline] __remove_hrtimer+0x116/0x440 kernel/time/hrtimer.c:1155 __run_hrtimer kernel/time/hrtimer.c:1910 [inline] __hrtimer_run_queues+0x359/0xa00 kernel/time/hrtimer.c:1994 hrtimer_interrupt+0x3e5/0x940 kernel/time/hrtimer.c:2113 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] __sysvec_apic_timer_interrupt+0x10b/0x460 arch/x86/kernel/apic/apic.c:1067 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1061 [inline] sysvec_apic_timer_interrupt+0x9e/0xc0 arch/x86/kernel/apic/apic.c:1061 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:lock_acquire+0x5e/0x370 kernel/locking/lockdep.c:5872 Code: 05 3b 65 25 12 83 f8 07 0f 87 d9 02 00 00 48 0f a3 05 46 e2 f2 0e 0f 82 a4 02 00 00 8b 35 ae 15 f3 0e 85 f6 0f 85 bf 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd 64 25 12 0f 85 ed 02 00 00 48 83 c4 RSP: 0018:ffffc900035c7600 EFLAGS: 00000206 RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000004 RDX: 0000000000000000 RSI: ffffffff8def6ef4 RDI: ffffffff8c1c4480 RBP: ffffffff8e7e55e0 R08: 000000001fccbb43 R09: 0000000000000007 R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:300 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] class_rcu_constructor include/linux/rcupdate.h:1181 [inline] unwind_next_frame+0xd1/0x2090 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x94/0xf0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2689 [inline] slab_free mm/slub.c:6251 [inline] kfree+0x223/0x6c0 mm/slub.c:6566 skb_kfree_head net/core/skbuff.c:1075 [inline] skb_free_head+0xb9/0x160 net/core/skbuff.c:1087 skb_release_data+0x6c5/0x8e0 net/core/skbuff.c:1114 skb_release_all net/core/skbuff.c:1189 [inline] __kfree_skb net/core/skbuff.c:1203 [inline] consume_skb net/core/skbuff.c:1436 [inline] consume_skb+0xc4/0x110 net/core/skbuff.c:1430 nsim_dev_trap_report drivers/net/netdevsim/dev.c:892 [inline] nsim_dev_trap_report_work+0x8de/0xd20 drivers/net/netdevsim/dev.c:922 process_one_work+0xa0e/0x1980 kernel/workqueue.c:3314 process_scheduled_works kernel/workqueue.c:3397 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3478 kthread+0x370/0x450 kernel/kthread.c:436 ret_from_fork+0x72b/0xd50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245