watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.7.599:8456] Modules linked in: irq event stamp: 13496557 hardirqs last enabled at (13496556): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:214 hardirqs last disabled at (13496557): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1052 softirqs last enabled at (13129306): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13129306): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13129306): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (13129309): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13129309): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13129309): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 8456 Comm: syz.7.599 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:virtqueue_add_split drivers/virtio/virtio_ring.c:673 [inline] RIP: 0010:virtqueue_add+0x2d4f/0x41b0 drivers/virtio/virtio_ring.c:2281 Code: 49 c1 e4 04 4c 8b 33 4d 01 e6 4c 89 f0 48 c1 e8 03 80 3c 28 00 74 08 4c 89 f7 e8 cc c3 26 fd 48 8b 84 24 b8 00 00 00 49 89 06 <48> 8b 03 4a 8d 1c 20 48 83 c3 08 48 89 d8 48 c1 e8 03 80 3c 28 00 RSP: 0018:ffffc90000a06fe8 EFLAGS: 00000246 RAX: ffff888075475dc0 RBX: ffff888140494e80 RCX: ffff888029ffdac0 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000001 RBP: dffffc0000000000 R08: ffffc90000a06b97 R09: 0000000000000000 R10: ffffc90000a06b88 R11: fffff52000140d73 R12: 00000000000002f0 R13: 0000000000000032 R14: ffff888143f302f0 R15: ffff888140494e00 FS: 00007f9c1b15f6c0(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c37a996 CR3: 0000000056d4e000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 00000000000f0602 Call Trace: virtqueue_add_outbuf+0xa3/0xf0 drivers/virtio/virtio_ring.c:2342 virtnet_add_outbuf drivers/net/virtio_net.c:574 [inline] xmit_skb drivers/net/virtio_net.c:3348 [inline] start_xmit+0x12f4/0x2ca0 drivers/net/virtio_net.c:3372 __netdev_start_xmit include/linux/netdevice.h:5248 [inline] netdev_start_xmit include/linux/netdevice.h:5257 [inline] xmit_one net/core/dev.c:3845 [inline] dev_hard_start_xmit+0x2d7/0x830 net/core/dev.c:3861 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:344 __dev_xmit_skb net/core/dev.c:4152 [inline] __dev_queue_xmit+0x1857/0x3b50 net/core/dev.c:4729 neigh_output include/net/neighbour.h:547 [inline] ip_finish_output2+0xd40/0x1160 net/ipv4/ip_output.c:237 NF_HOOK_COND include/linux/netfilter.h:307 [inline] ip_output+0x29f/0x450 net/ipv4/ip_output.c:438 ip_local_out net/ipv4/ip_output.c:131 [inline] __ip_queue_xmit+0x118d/0x1c30 net/ipv4/ip_output.c:534 __tcp_transmit_skb+0x24f6/0x3aa0 net/ipv4/tcp_output.c:1628 tcp_ack_snd_check net/ipv4/tcp_input.c:5960 [inline] tcp_rcv_established+0x141d/0x2670 net/ipv4/tcp_input.c:6451 tcp_v4_do_rcv+0xa90/0x1430 net/ipv4/tcp_ipv4.c:1931 tcp_v4_rcv+0x2675/0x2f20 net/ipv4/tcp_ipv4.c:2374 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x3bb/0x6f0 net/ipv4/ip_input.c:239 NF_HOOK+0x30c/0x3a0 include/linux/netfilter.h:318 dst_input include/net/dst.h:474 [inline] ip_sublist_rcv_finish+0x221/0x2a0 net/ipv4/ip_input.c:584 ip_list_rcv_finish net/ipv4/ip_input.c:636 [inline] ip_sublist_rcv+0x74c/0xa10 net/ipv4/ip_input.c:644 ip_list_rcv+0x3e2/0x430 net/ipv4/ip_input.c:678 __netif_receive_skb_list_ptype net/core/dev.c:6122 [inline] __netif_receive_skb_list_core+0x571/0x800 net/core/dev.c:6159 __netif_receive_skb_list net/core/dev.c:6221 [inline] netif_receive_skb_list_internal+0x96f/0xcb0 net/core/dev.c:6312 gro_normal_list include/net/gro.h:524 [inline] gro_normal_one include/net/gro.h:544 [inline] gro_skb_finish net/core/gro.c:603 [inline] gro_receive_skb+0x642/0xce0 net/core/gro.c:633 receive_buf+0xa0e/0x15e0 drivers/net/virtio_net.c:2648 virtnet_receive_packets drivers/net/virtio_net.c:2996 [inline] virtnet_receive drivers/net/virtio_net.c:3020 [inline] virtnet_poll+0x1fe1/0x2db0 drivers/net/virtio_net.c:3114 __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 3b 84 48 f6 e8 d6 59 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:ffffc9000b8c6ca0 EFLAGS: 00000286 RAX: d1708be30c0c5500 RBX: ffff888029ffdac0 RCX: d1708be30c0c5500 RDX: 0000000000000000 RSI: ffffffff8d70d3c0 RDI: 0000000000000001 RBP: ffffc9000b8c6d50 R08: ffffffff8f7cda77 R09: 1ffffffff1ef9b4e R10: dffffc0000000000 R11: fffffbfff1ef9b4f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92001718d94 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:orc_find arch/x86/kernel/unwind_orc.c:217 [inline] RIP: 0010:unwind_next_frame+0x214/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: ef 08 8b 15 be 44 1f 0c 8d 42 ff 44 39 f8 0f 86 65 18 00 00 44 89 f8 4c 8d 2c 85 38 f4 b4 90 4c 89 e8 48 c1 e8 03 0f b6 04 28 <84> c0 48 89 eb 0f 85 1c 1c 00 00 45 8b 6d 00 44 89 f8 ff c0 48 8d RSP: 0018:ffffc9000b8c6e18 EFLAGS: 00000a07 RAX: 0000000000000000 RBX: 0000000000000001 RCX: d1708be30c0c5500 RDX: 00000000000a4a06 RSI: ffffffff8bbf0740 RDI: ffffffff8bbf0700 RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffffff81738d25 R10: ffffc9000b8c6a48 R11: ffffffff81ac2f50 R12: ffffffff822f1574 R13: ffffffff90b9b08c R14: ffffc9000b8c6ee8 R15: 0000000000012f15 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:332 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850 prep_new_page mm/page_alloc.c:1858 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416 alloc_frozen_pages_noprof mm/mempolicy.c:2487 [inline] alloc_pages_noprof+0xa9/0x190 mm/mempolicy.c:2507 get_free_pages_noprof+0xf/0x80 mm/page_alloc.c:5242 __kasan_populate_vmalloc mm/kasan/shadow.c:364 [inline] kasan_populate_vmalloc+0x38/0x270 mm/kasan/shadow.c:435 alloc_vmap_area+0xd7a/0x14c0 mm/vmalloc.c:2098 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3193 __vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline] __vmalloc_noprof+0xb1/0xf0 mm/vmalloc.c:3974 bpf_prog_alloc_no_stats+0x4a/0x4d0 kernel/bpf/core.c:106 bpf_prog_alloc+0x3c/0x1a0 kernel/bpf/core.c:153 bpf_prog_load+0x735/0x19e0 kernel/bpf/syscall.c:2981 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6149 __do_sys_bpf kernel/bpf/syscall.c:6259 [inline] __se_sys_bpf kernel/bpf/syscall.c:6257 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6257 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: 0033:0x7f9c1a38efc9 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:00007f9c1b15f038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f9c1a5e6090 RCX: 00007f9c1a38efc9 RDX: 0000000000000094 RSI: 0000200000000300 RDI: 0000000000000005 RBP: 00007f9c1a411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9c1a5e6128 R14: 00007f9c1a5e6090 R15: 00007ffea5a89038 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 62 Comm: kworker/u8:5 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Workqueue: writeback wb_workfn (flush-8:0) 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 b6 73 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 61 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 45 6f RSP: 0018:ffffc9000213e380 EFLAGS: 00000293 RAX: ffffffff81b4974b RBX: 1ffff11017127ffd RCX: ffff88801c325ac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc9000213e500 R08: ffff888030d494c7 R09: 1ffff110061a9298 R10: dffffc0000000000 R11: ffffffff81758770 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: 00007f024c374e80 CR3: 000000007d66a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1381 [inline] flush_tlb_mm_range+0x6b1/0x12d0 arch/x86/mm/tlb.c:1471 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101 page_vma_mkclean_one+0x406/0x740 mm/rmap.c:1041 page_mkclean_one+0x1c0/0x280 mm/rmap.c:1082 __rmap_walk_file+0x467/0x620 mm/rmap.c:2918 rmap_walk mm/rmap.c:2962 [inline] folio_mkclean+0x297/0x390 mm/rmap.c:1114 folio_clear_dirty_for_io+0x1f5/0x880 mm/page-writeback.c:2938 mpage_submit_folio+0x86/0x2b0 fs/ext4/inode.c:2061 mpage_map_and_submit_buffers fs/ext4/inode.c:2324 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2514 [inline] ext4_do_writepages+0x1d43/0x4610 fs/ext4/inode.c:2931 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025 do_writepages+0x32e/0x550 mm/page-writeback.c:2604 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1719 writeback_sb_inodes+0x6c7/0x1010 fs/fs-writeback.c:2015 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2086 wb_writeback+0x44f/0xaf0 fs/fs-writeback.c:2197 wb_check_old_data_flush fs/fs-writeback.c:2301 [inline] wb_do_writeback fs/fs-writeback.c:2354 [inline] wb_workfn+0xaef/0xef0 fs/fs-writeback.c:2382 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