watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.0.15:5995] Modules linked in: irq event stamp: 14163523 hardirqs last enabled at (14163522): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (14163523): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (14076880): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (14076880): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (14076880): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (14076883): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (14076883): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (14076883): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 5995 Comm: syz.0.15 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:napi_skb_cache_put+0x0/0x730 net/core/skbuff.c:1418 Code: 89 df 5b 41 5e 5d eb 22 e8 dd 23 a0 f8 eb f0 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 41 55 41 54 53 48 83 ec 20 49 89 fc e8 aa 23 a0 f8 RSP: 0018:ffffc90000a08918 EFLAGS: 00000296 RAX: 0000000000000000 RBX: 0000000000000042 RCX: 1ffff1100ed0bf27 RDX: ffff88807685f93e RSI: ffffffff8d70bef6 RDI: ffff88807685f8c0 RBP: ffffc90000a08a40 R08: ffffffff8f7cd277 R09: 1ffffffff1ef9a4e R10: dffffc0000000000 R11: fffffbfff1ef9a4f R12: ffff88807685f930 R13: dffffc0000000000 R14: ffff88807685f8c0 R15: ffff888143b724f0 FS: 00007f096b7736c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000007f2c6000 CR4: 00000000003526f0 Call Trace: __free_old_xmit+0x2c7/0x650 drivers/net/virtio_net.c:-1 virtnet_free_old_xmit drivers/net/virtio_net.c:639 [inline] free_old_xmit drivers/net/virtio_net.c:1094 [inline] virtnet_poll_tx+0x42b/0x1550 drivers/net/virtio_net.c:3260 __napi_poll+0xc7/0x360 net/core/dev.c:7594 napi_poll net/core/dev.c:7657 [inline] net_rx_action+0x5f7/0xdf0 net/core/dev.c:7784 handle_softirqs+0x286/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7256 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 10 00 00 00 74 64 bf 01 00 00 00 e8 ab 94 48 f6 e8 36 67 80 f6 fb bf 01 00 00 00 5b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9000543f720 EFLAGS: 00000282 RAX: d6eae757ba4fad00 RBX: 0000000000000000 RCX: d6eae757ba4fad00 RDX: 0000000000000007 RSI: ffffffff8d70bef6 RDI: 0000000000000001 RBP: ffffc9000543f7c0 R08: ffffffff8f7cd277 R09: 1ffffffff1ef9a4e R10: dffffc0000000000 R11: fffffbfff1ef9a4f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000a87ee4 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:mt_external_lock include/linux/maple_tree.h:798 [inline] RIP: 0010:mt_locked lib/maple_tree.c:727 [inline] RIP: 0010:mt_slot lib/maple_tree.c:734 [inline] RIP: 0010:mas_next_slot+0x920/0xcf0 lib/maple_tree.c:4404 Code: f8 48 c1 e8 03 42 0f b6 04 20 84 c0 0f 85 f5 02 00 00 45 8b 3f b8 00 03 00 00 41 21 c7 bf 00 03 00 00 44 89 fe e8 b0 9a 81 f6 <41> 81 ff 00 03 00 00 75 36 48 89 d8 48 c1 e8 03 42 80 3c 20 00 4c RSP: 0018:ffffc9000543f880 EFLAGS: 00000297 RAX: ffffffff8b3e6d80 RBX: ffff888032acab40 RCX: 0000000000000002 RDX: ffff888024de9e40 RSI: 0000000000000300 RDI: 0000000000000300 RBP: 0000000000000001 R08: ffff888024de9e40 R09: 0000000000000004 R10: 0000000000000003 R11: 0000000000000002 R12: dffffc0000000000 R13: ffff8880776d5a00 R14: ffff8880263b6dc0 R15: 0000000000000300 mt_find+0x2f3/0x5e0 lib/maple_tree.c:6506 find_vma+0xe7/0x160 mm/mmap.c:909 lock_mm_and_find_vma+0x5f/0x300 mm/mmap_lock.c:431 do_user_addr_fault+0x331/0x1380 arch/x86/mm/fault.c:1359 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:72 [inline] RIP: 0010:strncpy_from_user+0x1bc/0x290 lib/strncpy_from_user.c:130 Code: c1 e8 03 49 01 c4 e9 8d 00 00 00 e8 de b0 fe fc 48 f7 dd 49 89 ec 48 8b 1c 24 31 ff 4c 89 ee e8 aa b5 fe fc 49 83 ed 01 72 44 <43> 8a 2c 27 4a 8d 3c 23 48 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 RSP: 0018:ffffc9000543fd10 EFLAGS: 00050212 RAX: ffffffff84c15326 RBX: ffff88805621b320 RCX: ffff888024de9e40 RDX: 0000000000000002 RSI: 0000000000000fe0 RDI: 0000000000000000 RBP: fffffffffffffff8 R08: ffff88805621c2ff R09: 1ffff1100ac4385f R10: dffffc0000000000 R11: ffffed100ac43860 R12: 0000000000000000 R13: 0000000000000fdf R14: 0000000000000fe0 R15: 0000000000000000 getname_flags+0xf3/0x540 fs/namei.c:157 getname include/linux/fs.h:2922 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1431 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f096a98efc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f096b773038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f096abe5fa0 RCX: 00007f096a98efc9 RDX: 00000000000026e1 RSI: 0000000000000000 RDI: ffffffffffffff9c RBP: 00007f096aa11f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f096abe6038 R14: 00007f096abe5fa0 R15: 00007ffc9cbf9258 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xd33/0x12d0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 96 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 41 6f 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 25 6f RSP: 0018:ffffc90000127640 EFLAGS: 00000293 RAX: ffffffff81b494cb RBX: 1ffff11017127ffd RCX: ffff88801c6f8000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900001277c0 R08: ffffffff8f7cd277 R09: 1ffffffff1ef9a4e R10: dffffc0000000000 R11: fffffbfff1ef9a4f R12: ffff8880b893ffe8 R13: dffffc0000000000 R14: ffff8880b883b240 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff88812613e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0f22d156e8 CR3: 000000000dd38000 CR4: 00000000003526f0 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2713 [inline] smp_text_poke_batch_finish+0x5f9/0x1130 arch/x86/kernel/alternative.c:2923 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:852 process_one_work kernel/workqueue.c:3263 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245