watchdog: BUG: soft lockup - CPU#1 stuck for 121s! [syz.5.268:7257] Modules linked in: irq event stamp: 13422011 hardirqs last enabled at (13422010): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (13422011): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (13279494): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (13279494): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (13279494): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (13279497): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (13279497): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (13279497): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7257 Comm: syz.5.268 Not tainted 6.15.0-rc4-syzkaller-g224ee86639f5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:__cant_sleep+0x62/0x210 kernel/sched/core.c:8824 Code: 8a b5 41 48 c7 44 24 08 b5 a8 90 8d 48 c7 44 24 10 80 69 92 81 49 89 e4 49 c1 ec 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4b 89 04 3c <66> 43 c7 44 3c 09 f3 f3 43 c6 44 3c 0b f3 48 c7 44 24 40 00 00 00 RSP: 0018:ffffc90000a06d00 EFLAGS: 00000a06 RAX: f2f2f200f1f1f1f1 RBX: 0000000000000001 RCX: ffff88806e389e00 RDX: 0000000000000000 RSI: 0000000000000072 RDI: ffffffff8b7032e0 RBP: ffffc90000a06db0 R08: 0000000000000001 R09: ffff8880b8932608 R10: 6f6c5f646165725f R11: 64656863735f6b63 R12: 1ffff92000140da0 R13: 1ffff92000140dc4 R14: ffff8880b8932608 R15: dffffc0000000000 FS: 00007fbc1ecb56c0(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055bccc445108 CR3: 000000005f978000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: trace_call_bpf+0x89/0x850 kernel/trace/bpf_trace.c:114 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10788 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:5829 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock_sched include/linux/rcupdate.h:932 [inline] pfn_valid include/linux/mmzone.h:2117 [inline] sg_phys include/linux/scatterlist.h:389 [inline] vring_map_one_sg+0x32c/0x7c0 drivers/virtio/virtio_ring.c:382 virtqueue_add_split drivers/virtio/virtio_ring.c:604 [inline] virtqueue_add+0x5ac/0x4030 drivers/virtio/virtio_ring.c:2282 virtqueue_add_outbuf+0xa3/0xf0 drivers/virtio/virtio_ring.c:2339 virtnet_add_outbuf drivers/net/virtio_net.c:545 [inline] xmit_skb drivers/net/virtio_net.c:3280 [inline] start_xmit+0xb64/0x2080 drivers/net/virtio_net.c:3304 __netdev_start_xmit include/linux/netdevice.h:5203 [inline] netdev_start_xmit include/linux/netdevice.h:5212 [inline] xmit_one net/core/dev.c:3776 [inline] dev_hard_start_xmit+0x2ff/0x880 net/core/dev.c:3792 sch_direct_xmit+0x241/0x4b0 net/sched/sch_generic.c:343 __dev_xmit_skb net/core/dev.c:4018 [inline] __dev_queue_xmit+0x17b6/0x3a70 net/core/dev.c:4595 dev_queue_xmit include/linux/netdevice.h:3350 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip_finish_output2+0xd03/0x1160 net/ipv4/ip_output.c:235 ip_local_out net/ipv4/ip_output.c:129 [inline] __ip_queue_xmit+0x1101/0x1b00 net/ipv4/ip_output.c:527 __tcp_transmit_skb+0x225c/0x36c0 net/ipv4/tcp_output.c:1479 tcp_ack_snd_check net/ipv4/tcp_input.c:5851 [inline] tcp_rcv_established+0xecf/0x1d10 net/ipv4/tcp_input.c:6315 tcp_v4_do_rcv+0xa23/0xce0 net/ipv4/tcp_ipv4.c:1925 tcp_v4_rcv+0x266e/0x2ef0 net/ipv4/tcp_ipv4.c:2363 ip_protocol_deliver_rcu+0x221/0x440 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2fb/0x580 net/ipv4/ip_input.c:233 NF_HOOK+0x309/0x3a0 include/linux/netfilter.h:314 dst_input include/net/dst.h:469 [inline] ip_sublist_rcv_finish+0x21d/0x2a0 net/ipv4/ip_input.c:578 ip_list_rcv_finish net/ipv4/ip_input.c:627 [inline] ip_sublist_rcv+0x6e7/0x9b0 net/ipv4/ip_input.c:635 ip_list_rcv+0x3e2/0x430 net/ipv4/ip_input.c:669 __netif_receive_skb_list_ptype net/core/dev.c:5930 [inline] __netif_receive_skb_list_core+0x7d2/0x800 net/core/dev.c:5977 __netif_receive_skb_list net/core/dev.c:6029 [inline] netif_receive_skb_list_internal+0x975/0xcc0 net/core/dev.c:6120 gro_normal_list include/net/gro.h:532 [inline] napi_complete_done+0x2f2/0x7c0 net/core/dev.c:6490 virtqueue_napi_complete drivers/net/virtio_net.c:737 [inline] virtnet_poll+0x2385/0x2d70 drivers/net/virtio_net.c:3053 __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:schedule_debug kernel/sched/core.c:5948 [inline] RIP: 0010:__schedule+0x18a/0x4cd0 kernel/sched/core.c:6666 Code: 08 4c 89 e7 e8 57 4a cb f6 4d 8b 34 24 49 8d 5e 20 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 39 4a cb f6 48 8b 1b <48> 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 20 4a cb f6 RSP: 0018:ffffc90003457800 EFLAGS: 00000246 RAX: 1ffff1100dc713c4 RBX: ffffc90003450000 RCX: 09615da4d7936a00 RDX: 0000000000000000 RSI: ffffffff8bc1cdc0 RDI: ffffffff8bc1cd80 RBP: ffffc90003457a10 R08: ffffffff8f7ec877 R09: 1ffffffff1efd90e R10: dffffc0000000000 R11: fffffbfff1efd90f R12: ffff8880b893a640 R13: dffffc0000000000 R14: ffff88806e389e00 R15: ffff8881261cc000 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7090 irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 RIP: 0010:put_cpu_partial+0x1b4/0x250 mm/slub.c:3273 Code: 85 b5 00 00 00 48 83 c4 20 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc e8 e8 fd 3d 09 f7 c5 00 02 00 00 74 bc fb 4d 85 e4 <75> bb eb c4 90 e8 92 62 9d 02 85 c0 74 22 83 3d 8b 5d 67 0d 00 75 RSP: 0018:ffffc90003457b80 EFLAGS: 00000286 RAX: 09615da4d7936a00 RBX: ffff88801a042140 RCX: 09615da4d7936a00 RDX: 0000000000000007 RSI: ffffffff8d749025 RDI: ffffffff8bc1cde0 RBP: 0000000000000282 R08: ffffffff8f7ec877 R09: 1ffffffff1efd90e R10: dffffc0000000000 R11: fffffbfff1efd90f R12: ffffea0001b27c00 R13: 0000000000000001 R14: ffff88806e389e00 R15: ffff8880b893e0c0 __slab_free+0x2f7/0x400 mm/slub.c:4526 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329 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 lsm_inode_alloc security/security.c:755 [inline] security_inode_alloc+0x39/0x330 security/security.c:1697 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306 inode_init_always include/linux/fs.h:3226 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode_pseudo include/linux/fs.h:3309 [inline] sock_alloc net/socket.c:622 [inline] __sock_create+0x12d/0x9f0 net/socket.c:1505 sock_create net/socket.c:1599 [inline] __sys_socket_create net/socket.c:1636 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1683 __do_sys_socket net/socket.c:1697 [inline] __se_sys_socket net/socket.c:1695 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1695 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc1dd8e969 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:00007fbc1ecb5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fbc1dfb5fa0 RCX: 00007fbc1dd8e969 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000029 RBP: 00007fbc1de10ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fbc1dfb5fa0 R15: 00007ffcd539ed28 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-rc4-syzkaller-g224ee86639f5 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x15/0xb0 kernel/rcu/tree.c:736 Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 ff 05 20 5a ce 10 e8 7b cb ae 09 <89> c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 10 RSP: 0018:ffffc90000a878a0 EFLAGS: 00000086 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 4f5c48a1acf28a00 RDX: 0000000000000000 RSI: ffffffff8bc1cdc0 RDI: ffffffff8bc1cd80 RBP: ffffffff81a102aa R08: ffffc90000a876cf R09: 0000000000000000 R10: ffffc90000a876c0 R11: ffffffffa0000954 R12: 0000000000000000 R13: ffffffff8df2fa20 R14: 0000000000000000 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f890e712fe4 CR3: 000000007c1cc000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: trace_lock_acquire include/trace/events/lock.h:24 [inline] lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5829 console_lock_spinning_enable kernel/printk/printk.c:1924 [inline] console_emit_next_record kernel/printk/printk.c:3132 [inline] console_flush_all+0x6d2/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 check_hung_task kernel/hung_task.c:181 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:265 [inline] watchdog+0xb4f/0x1030 kernel/hung_task.c:437 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