watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.7.7139:5320] Modules linked in: irq event stamp: 13390059 hardirqs last enabled at (13390058): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (13390059): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (13373422): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (13373422): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (13373422): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (13373425): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (13373425): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (13373425): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 5320 Comm: syz.7.7139 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 45 45 0d 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 c1 b2 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d fe 79 73 RSP: 0018:ffffc90000a08518 EFLAGS: 00000286 RAX: 8492e89f3550e100 RBX: 0000000000000246 RCX: 0000000000000102 RDX: 00000000a42637f2 RSI: ffffffff8e169c78 RDI: ffffffff8c27c800 RBP: 0000000000000000 R08: ffffffff81767e95 R09: ffffffff8e75e5e0 R10: ffffc90000a08678 R11: ffffffff81b0c390 R12: 0000000000000002 R13: ffffffff8e75e5e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f1dd96856c0(0000) GS:ffff88812555c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556180f4e8 CR3: 00000000afbb4000 CR4: 00000000003526f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] kmem_cache_alloc_node_noprof+0x384/0x690 mm/slub.c:4918 __alloc_skb+0x1d0/0x7d0 net/core/skbuff.c:702 __netdev_alloc_skb+0xc1/0x810 net/core/skbuff.c:775 netdev_alloc_skb include/linux/skbuff.h:3485 [inline] dev_alloc_skb include/linux/skbuff.h:3498 [inline] __ieee80211_beacon_get+0xc06/0x1880 net/mac80211/tx.c:5658 ieee80211_beacon_get_tim+0xbd/0x2c0 net/mac80211/tx.c:5780 ieee80211_beacon_get include/net/mac80211.h:5720 [inline] mac80211_hwsim_beacon_tx+0x3c5/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2361 __iterate_interfaces+0x2ab/0x590 net/mac80211/util.c:760 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:796 mac80211_hwsim_beacon+0xbb/0x180 drivers/net/wireless/virtual/mac80211_hwsim.c:2395 __run_hrtimer kernel/time/hrtimer.c:1785 [inline] __hrtimer_run_queues+0x53a/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_run_softirq+0x182/0x5a0 kernel/time/hrtimer.c:1866 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 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:__copy_present_ptes mm/memory.c:1102 [inline] RIP: 0010:copy_present_ptes mm/memory.c:1194 [inline] RIP: 0010:copy_pte_range mm/memory.c:1317 [inline] RIP: 0010:copy_pmd_range+0x21fc/0x8050 mm/memory.c:1405 Code: 00 00 e8 e7 ef ae ff 48 8b 5c 24 70 4c 8b b4 24 a0 01 00 00 49 89 df 49 c1 ef 03 43 80 3c 27 00 74 08 48 89 df e8 14 4e 19 00 <48> 8b 1b 83 e3 28 bf 20 00 00 00 48 89 de e8 91 f4 ae ff 48 83 fb RSP: 0018:ffffc90005df7320 EFLAGS: 00000246 RAX: ffffffff82169ff5 RBX: ffff8880b1ff1160 RCX: ffff88803b3c5b80 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90005df75b0 R08: ffffea0005764947 R09: 1ffffd4000aec928 R10: dffffc0000000000 R11: fffff94000aec929 R12: dffffc0000000000 R13: ffffea0005764940 R14: 800000015d925007 R15: 1ffff110163fe22c copy_pud_range mm/memory.c:1442 [inline] copy_p4d_range mm/memory.c:1466 [inline] copy_page_range+0xbe8/0x11f0 mm/memory.c:1552 dup_mmap+0xf40/0x1d90 mm/mmap.c:1841 dup_mm kernel/fork.c:1531 [inline] copy_mm+0x13b/0x4a0 kernel/fork.c:1583 copy_process+0x18b6/0x3cd0 kernel/fork.c:2223 kernel_clone+0x248/0x8e0 kernel/fork.c:2653 __do_sys_clone kernel/fork.c:2794 [inline] __se_sys_clone kernel/fork.c:2778 [inline] __x64_sys_clone+0x1b6/0x230 kernel/fork.c:2778 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1dd879c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f1dd9684fd8 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f1dd8a15fa0 RCX: 00007f1dd879c799 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f1dd8832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1dd8a16038 R14: 00007f1dd8a15fa0 R15: 00007ffc49a535c8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 18 Comm: rcu_exp_gp_kthr Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:hlock_class kernel/locking/lockdep.c:246 [inline] RIP: 0010:__lock_acquire+0x8b5/0x2cf0 kernel/locking/lockdep.c:5233 Code: 84 b3 01 00 00 41 8b 45 f8 25 ff 1f 00 00 48 0f a3 05 2f 7d 82 12 0f 83 5f 01 00 00 48 69 c0 c8 00 00 00 48 8d 80 10 14 c5 93 7e 01 00 00 e8 21 38 0a 03 85 c0 0f 84 63 0b 00 00 83 3d 26 4f RSP: 0018:ffffc90000177620 EFLAGS: 00000006 RAX: ffffffff93c51f00 RBX: 000000007770645b RCX: 00000000e5c25671 RDX: 000000008c7c7590 RSI: 000000006922f0dd RDI: ffff88801d6c3d00 RBP: dfae143e00000000 R08: ffffffff81a4aad3 R09: ffffffff8e750b40 R10: dffffc0000000000 R11: fffffbfff1cea12d R12: ffff88801d6c48d0 R13: ffff88801d6c48d0 R14: ffff88801d6c3d00 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff88812545c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556180f4e8 CR3: 0000000084bdc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 printk_legacy_allow_spinlock_enter kernel/printk/printk.c:3095 [inline] console_emit_next_record kernel/printk/printk.c:3182 [inline] console_flush_one_record kernel/printk/printk.c:3269 [inline] console_flush_all+0x6e5/0xb20 kernel/printk/printk.c:3343 __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3413 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2479 _printk+0xdd/0x130 kernel/printk/printk.c:2504 synchronize_rcu_expedited_stall+0x5f/0x1160 kernel/rcu/tree_exp.h:570 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:673 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:692 [inline] rcu_exp_sel_wait_wake+0x979/0x1140 kernel/rcu/tree_exp.h:726 kthread_worker_fn+0x509/0xb70 kernel/kthread.c:1025 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245