watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.2.450:7897] Modules linked in: irq event stamp: 19893539 hardirqs last enabled at (19893538): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (19893539): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (18632176): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (18632176): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (18632176): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (18632179): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (18632179): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (18632179): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7897 Comm: syz.2.450 Not tainted 6.15.0-rc4-syzkaller-g7220eabff8cb #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:unwind_next_frame+0x19ae/0x2390 arch/x86/kernel/unwind_orc.c:680 Code: c7 80 20 68 8b be 66 03 00 00 48 c7 c2 20 21 68 8b e8 16 84 2c 00 48 c7 c7 60 b8 f3 8d 4c 89 fe e8 f7 69 2c 00 e8 e2 e7 35 00 <89> d8 48 81 c4 98 00 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc RSP: 0018:ffffc90000a08238 EFLAGS: 00000287 RAX: 0000000000000000 RBX: ffffffff901c4c01 RCX: 00016ce0ca8ed700 RDX: 0000000000000002 RSI: ffffffff8d74a4de RDI: ffffffff8bc1d020 RBP: dffffc0000000000 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: ffffc9000d4cf780 R13: ffffc9000d4c8000 R14: ffffc90000a08308 R15: ffffffff817199f5 FS: 0000000000000000(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd42bec9d4a CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: 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:4161 [inline] slab_alloc_node mm/slub.c:4210 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4217 __build_skb net/core/skbuff.c:465 [inline] build_skb+0x51/0x280 net/core/skbuff.c:481 virtnet_build_skb drivers/net/virtio_net.c:787 [inline] page_to_skb+0x112/0x8d0 drivers/net/virtio_net.c:829 receive_mergeable drivers/net/virtio_net.c:2430 [inline] receive_buf+0x302/0x1580 drivers/net/virtio_net.c:2568 virtnet_receive_packets drivers/net/virtio_net.c:2926 [inline] virtnet_receive drivers/net/virtio_net.c:2950 [inline] virtnet_poll+0x1f9b/0x2d70 drivers/net/virtio_net.c:3045 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 handle_softirqs+0x283/0x870 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:raw_spin_rq_unlock_irq+0x13/0x90 kernel/sched/sched.h:1526 Code: cc e8 41 ec c2 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 41 56 53 66 90 e8 84 6f c5 09 e8 ef 51 34 00 fb 5b <41> 5e 41 5f c3 cc cc cc cc cc f3 0f 1e fa 49 be 00 00 00 00 00 fc RSP: 0018:ffffc9000d4ced48 EFLAGS: 00000286 RAX: 00016ce0ca8ed700 RBX: ffff88802f8fc380 RCX: 00016ce0ca8ed700 RDX: 0000000000000006 RSI: ffffffff8d74a4de RDI: ffffffff8bc1d020 RBP: ffffc9000d4cef70 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: ffff88802f8fbc00 R13: dffffc0000000000 R14: ffff88802f8fbc00 R15: ffff8880b8939b40 __schedule+0x1932/0x4cd0 kernel/sched/core.c:6771 preempt_schedule_common+0x83/0xd0 kernel/sched/core.c:6947 preempt_schedule+0xae/0xc0 kernel/sched/core.c:6971 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3f/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] filemap_remove_folio+0x1a2/0x1f0 mm/filemap.c:257 truncate_inode_folio+0x5d/0x70 mm/truncate.c:176 shmem_undo_range+0x3a9/0x14b0 mm/shmem.c:1121 shmem_truncate_range mm/shmem.c:1237 [inline] shmem_evict_inode+0x272/0xa70 mm/shmem.c:1365 evict+0x501/0x9c0 fs/inode.c:810 __dentry_kill+0x209/0x660 fs/dcache.c:660 shrink_kill+0xa9/0x2c0 fs/dcache.c:1105 shrink_dentry_list+0x2e0/0x5e0 fs/dcache.c:1132 shrink_dcache_parent+0xa1/0x2c0 fs/dcache.c:-1 do_one_tree+0x23/0xe0 fs/dcache.c:1595 shrink_dcache_for_umount+0xa0/0x170 fs/dcache.c:1612 generic_shutdown_super+0x67/0x2c0 fs/super.c:620 kill_anon_super fs/super.c:1237 [inline] kill_litter_super+0x76/0xb0 fs/super.c:1247 deactivate_locked_super+0xb9/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1435 task_work_run+0x1d1/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x8d6/0x2550 kernel/exit.c:953 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa4a258e969 Code: Unable to access opcode bytes at 0x7fa4a258e93f. RSP: 002b:00007fa4a331b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: 000000000000002e RBX: 00007fa4a27b5fa0 RCX: 00007fa4a258e969 RDX: 0000000000000048 RSI: 00002000000007c0 RDI: 0000000000000000 RBP: 00007fa4a2610ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa4a27b5fa0 R15: 00007fff600b3dd8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 2984 Comm: kworker/u8:8 Not tainted 6.15.0-rc4-syzkaller-g7220eabff8cb #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xe69/0x11c0 kernel/smp.c:885 Code: 00 45 8b 2f 44 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 <43> 0f b6 04 2c 84 c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b RSP: 0000:ffffc9000bdb7700 EFLAGS: 00000293 RAX: ffffffff81b45620 RBX: ffff8880b883ad40 RCX: ffff88802fa3da00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000bdb7860 R08: ffffffff8f7ed277 R09: 1ffffffff1efda4e R10: dffffc0000000000 R11: fffffbfff1efda4f R12: 1ffff11017127e99 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b893f4c8 FS: 0000000000000000(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055e2e8a05138 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2455 [inline] text_poke_bp_batch+0x319/0x940 arch/x86/kernel/alternative.c:2665 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x128/0x250 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xad/0x240 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245