watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.4.4958:25445] Modules linked in: irq event stamp: 13450871 hardirqs last enabled at (13450870): [] irqentry_exit+0x5dd/0x660 kernel/entry/common.c:219 hardirqs last disabled at (13450871): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (11002616): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (11002616): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (11002616): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 softirqs last disabled at (11002619): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11002619): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11002619): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 25445 Comm: syz.4.4958 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:find_stack lib/stackdepot.c:602 [inline] RIP: 0010:stack_depot_save_flags+0x1ab/0x850 lib/stackdepot.c:668 Code: 02 00 00 31 f6 4c 89 54 24 18 e8 00 7a c7 ff 4c 8b 54 24 18 8b 74 24 04 85 db 75 5d 4d 8b 3f 4d 39 e7 74 52 41 39 6f 10 75 f2 <45> 39 57 14 75 ec 31 c0 49 8b 0c c6 49 3b 4c c7 20 75 df 48 ff c0 RSP: 0018:ffffc90000a07d78 EFLAGS: 00000246 RAX: ffff88823ae00000 RBX: ffff88802b91e101 RCX: 0000000000f7b870 RDX: 00000000b8714ad9 RSI: 0000000000000001 RDI: 000000002803dd12 RBP: 0000000082bf7b87 R08: 00000000bbad75af R09: 000000006ffb0dc4 R10: 0000000000000010 R11: ffffffff81ada120 R12: ffff88823bd7b870 R13: 0000000000000010 R14: ffffc90000a07e20 R15: ffff88807c432240 FS: 00007f582a0856c0(0000) GS:ffff888125f35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000000 CR3: 000000002e406000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: save_stack+0x103/0x1f0 mm/page_owner.c:166 __set_page_owner+0x8d/0x4c0 mm/page_owner.c:341 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486 alloc_slab_page mm/slub.c:3075 [inline] allocate_slab+0x86/0x3b0 mm/slub.c:3248 new_slab mm/slub.c:3302 [inline] ___slab_alloc+0xf2b/0x1960 mm/slub.c:4656 __kmem_cache_alloc_bulk+0x1d9/0x550 mm/slub.c:7429 kmem_cache_alloc_bulk_noprof+0x3ba/0x720 mm/slub.c:7495 napi_skb_cache_get+0x41f/0x780 net/core/skbuff.c:291 __alloc_skb+0x1a7/0x430 net/core/skbuff.c:668 napi_alloc_skb+0x84/0x7c0 net/core/skbuff.c:832 page_to_skb+0x2ce/0x870 drivers/net/virtio_net.c:904 receive_mergeable drivers/net/virtio_net.c:2514 [inline] receive_buf+0x527/0x1900 drivers/net/virtio_net.c:2660 virtnet_receive_packets drivers/net/virtio_net.c:3023 [inline] virtnet_receive drivers/net/virtio_net.c:3047 [inline] virtnet_poll+0x20f6/0x2ee0 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x320 net/core/dev.c:7666 napi_poll net/core/dev.c:7729 [inline] net_rx_action+0x672/0xe50 net/core/dev.c:7881 handle_softirqs+0x27d/0x850 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:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:printk_percpu_data_ready+0x0/0x20 kernel/printk/printk.c:532 Code: 48 c7 c7 80 d1 e1 8d 89 de 5b e9 8b 17 06 00 e8 f6 ad 20 00 90 0f 0b 90 eb c2 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 e8 d7 ad 20 00 0f b6 05 18 31 fa 0b e9 1b 97 bd 09 cc RSP: 0018:ffffc900047eea38 EFLAGS: 00000283 RAX: ffffffff8b5c1e25 RBX: ffffc900047eeb60 RCX: 0000000000080000 RDX: ffffc9000e9f3000 RSI: 0000000000000dfd RDI: 0000000000000dfe RBP: ffffc900047eebd0 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffffbfff1bbae2c R12: dffffc0000000000 R13: 1ffff920008fdd80 R14: ffffc900047eebf8 R15: ffffc900047eebf8 nbcon_get_cpu_emergency_nesting+0xa/0x40 kernel/printk/nbcon.c:1408 nbcon_get_default_prio+0x2e/0x80 kernel/printk/nbcon.c:1433 printk_get_console_flush_type+0x22/0x4f0 kernel/printk/internal.h:198 console_flush_one_record kernel/printk/printk.c:3190 [inline] console_flush_all+0x109/0xb60 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3359 vprintk_emit+0x4f8/0x5f0 kernel/printk/printk.c:2426 _printk+0xcf/0x120 kernel/printk/printk.c:2451 validate_nla lib/nlattr.c:414 [inline] __nla_validate_parse+0x1719/0x2d40 lib/nlattr.c:635 validate_nla lib/nlattr.c:512 [inline] __nla_validate_parse+0xa1a/0x2d40 lib/nlattr.c:635 __nla_parse+0x40/0x60 lib/nlattr.c:732 __nlmsg_parse include/net/netlink.h:789 [inline] genl_family_rcv_msg_attrs_parse+0x1c9/0x2a0 net/netlink/genetlink.c:945 genl_family_rcv_msg_doit+0xb8/0x300 net/netlink/genetlink.c:1093 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2550 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1894 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg+0x21c/0x270 net/socket.c:742 ____sys_sendmsg+0x505/0x820 net/socket.c:2592 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2646 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2683 [inline] __se_sys_sendmsg net/socket.c:2681 [inline] __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2681 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f582918f749 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:00007f582a085038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f58293e5fa0 RCX: 00007f582918f749 RDX: 0000000000008010 RSI: 0000200000000000 RDI: 000000000000000b RBP: 00007f5829213f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f58293e6038 R14: 00007f58293e5fa0 R15: 00007ffd05916808 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 25457 Comm: syz.1.4960 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:arch_irqs_disabled_flags arch/x86/include/asm/irqflags.h:146 [inline] RIP: 0010:arch_irqs_disabled arch/x86/include/asm/irqflags.h:153 [inline] RIP: 0010:seqcount_lockdep_reader_access+0x130/0x1c0 include/linux/seqlock.h:74 Code: c9 41 56 e8 32 0e ef ff 48 83 c4 08 48 89 df 4c 89 f6 e8 03 3f ef ff e8 ce 21 1a 00 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 <48> 8b 5c 24 20 48 89 de 48 81 e6 00 02 00 00 31 ff e8 4a 4f 12 00 RSP: 0018:ffffc90000006de0 EFLAGS: 00000082 RAX: 240ae97275075500 RBX: ffffffff998e3508 RCX: 240ae97275075500 RDX: 0000000000000003 RSI: ffffffff8d978ff2 RDI: ffffffff8bc08360 RBP: ffffc90000006e90 R08: ffffc90000006a17 R09: 0000000000000000 R10: ffffc90000006a08 R11: fffff52000000d43 R12: dffffc0000000000 R13: 0000000000000000 R14: ffffffff81afcf47 R15: 1ffff92000000dbc FS: 00007f7742cda6c0(0000) GS:ffff888125e35000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7742c98d58 CR3: 000000007532c000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff1 DR7: 0000000000000600 Call Trace: ktime_get_update_offsets_now+0x67/0x3d0 kernel/time/timekeeping.c:2570 hrtimer_update_base kernel/time/hrtimer.c:633 [inline] hrtimer_interrupt+0x132/0xaa0 kernel/time/hrtimer.c:1885 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3e0 arch/x86/kernel/apic/apic.c:1062 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:strlen+0x3f/0x70 lib/string.c:420 Code: 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 19 b1 RSP: 0018:ffffc90000007138 EFLAGS: 00000206 RAX: 0000000000000009 RBX: ffffffff8b6c108a RCX: 000000008b6c1001 RDX: 0000000000000000 RSI: ffffffff8df41a20 RDI: ffffffff8b6c1080 RBP: ffffc90000007258 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc90000006f48 R11: ffffffff81ada120 R12: 1ffff92000000e34 R13: ffffffff8df41a20 R14: dffffc0000000000 R15: 0000000000000008 __fortify_strlen include/linux/fortify-string.h:268 [inline] trace_event_get_offsets_lock_acquire include/trace/events/lock.h:24 [inline] do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0xcb/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+0x2fb/0x340 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 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:56 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:77 unpoison_slab_object mm/kasan/common.c:339 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:365 kasan_slab_alloc include/linux/kasan.h:252 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_node_noprof+0x43c/0x720 mm/slub.c:5315 kmalloc_reserve+0xbd/0x290 net/core/skbuff.c:586 __alloc_skb+0x27e/0x430 net/core/skbuff.c:690 __netdev_alloc_skb+0x108/0x960 net/core/skbuff.c:754 netdev_alloc_skb include/linux/skbuff.h:3484 [inline] dev_alloc_skb include/linux/skbuff.h:3497 [inline] hsr_init_skb+0xef/0x6e0 net/hsr/hsr_device.c:267 send_hsr_supervision_frame+0x143/0xcb0 net/hsr/hsr_device.c:316 hsr_announce+0x1d5/0x360 net/hsr/hsr_device.c:421 call_timer_fn+0x16e/0x590 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2404 handle_softirqs+0x27d/0x850 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:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:strlen+0x3f/0x70 lib/string.c:420 Code: 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00 <75> de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc 48 89 df e8 19 b1 RSP: 0018:ffffc900048ef018 EFLAGS: 00000246 RAX: 000000000000000d RBX: ffffffff8b6c108e RCX: 000000008b6c1005 RDX: 0000000000000000 RSI: ffffffff8df41a20 RDI: ffffffff8b6c1080 RBP: ffffc900048ef138 R08: 0000000000000002 R09: 0000000000000000 R10: ffffc900048eee08 R11: ffffffff81ada120 R12: 1ffff9200091de10 R13: ffffffff8df41a20 R14: dffffc0000000000 R15: 000000000000000c __fortify_strlen include/linux/fortify-string.h:268 [inline] trace_event_get_offsets_lock_acquire include/trace/events/lock.h:24 [inline] do_perf_trace_lock_acquire include/trace/events/lock.h:24 [inline] perf_trace_lock_acquire+0xcb/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+0x2fb/0x340 kernel/locking/lockdep.c:5831 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:867 [inline] class_rcu_constructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0xc2/0x23d0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:56 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0x157/0x9c0 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14c4/0x5000 kernel/sched/core.c:6863 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7190 irqentry_exit+0x5d8/0x660 kernel/entry/common.c:216 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:98 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:115 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:140 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:172 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:191 [inline] RIP: 0010:kasan_check_range+0x9f/0x2c0 mm/kasan/generic.c:200 Code: 00 fc ff df 4d 8d 34 19 4d 89 f4 4d 29 dc 49 83 fc 10 7f 29 4d 85 e4 0f 84 41 01 00 00 4c 89 cb 48 f7 d3 4c 01 fb 41 80 3b 00 <0f> 85 de 01 00 00 49 ff c3 48 ff c3 75 ee e9 21 01 00 00 44 89 dd RSP: 0018:ffffc900048efb88 EFLAGS: 00000246 RAX: ffffffff822f4601 RBX: ffffffffffffffff RCX: ffffffff822f45f6 RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801c2889c0 RBP: 1ffff110051d7147 R08: ffff88801c2889c7 R09: 1ffff11003851138 R10: dffffc0000000000 R11: ffffed1003851138 R12: 0000000000000001 R13: dffffc0000000000 R14: ffffed1003851139 R15: 1ffff11003851138 instrument_atomic_read_write include/linux/instrumented.h:96 [inline] atomic_long_add_return include/linux/atomic/atomic-instrumented.h:3279 [inline] page_counter_charge+0x66/0x1a0 mm/page_counter.c:84 obj_cgroup_charge_pages+0x3f/0xa0 mm/memcontrol.c:2828 obj_cgroup_charge_account+0xcf/0x650 mm/memcontrol.c:3126 __memcg_slab_post_alloc_hook+0x3e5/0x730 mm/memcontrol.c:3212 memcg_slab_post_alloc_hook mm/slub.c:2338 [inline] slab_post_alloc_hook mm/slub.c:4964 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_lru_noprof+0x41f/0x6e0 mm/slub.c:5282 sock_alloc_inode+0x28/0xc0 net/socket.c:322 alloc_inode+0x6a/0x1b0 fs/inode.c:346 new_inode_pseudo include/linux/fs.h:2964 [inline] sock_alloc net/socket.c:637 [inline] __sock_create+0x12d/0x9d0 net/socket.c:1569 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd7/0x1b0 net/socket.c:1747 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7741d8f749 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:00007f7742cda038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007f7741fe5fa0 RCX: 00007f7741d8f749 RDX: 000000000000000c RSI: 0000000000000003 RDI: 0000000000000010 RBP: 00007f7741e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7741fe6038 R14: 00007f7741fe5fa0 R15: 00007ffda7edf3f8