watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.0.374:7301] Modules linked in: irq event stamp: 13389217 hardirqs last enabled at (13389216): [] irqentry_exit+0x59c/0x620 kernel/entry/common.c:219 hardirqs last disabled at (13389217): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (11975736): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (11975736): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (11975736): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (11975739): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (11975739): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (11975739): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 7301 Comm: syz.0.374 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:rol32 include/linux/bitops.h:126 [inline] RIP: 0010:jhash2 include/linux/jhash.h:129 [inline] RIP: 0010:hash_stack lib/stackdepot.c:563 [inline] RIP: 0010:stack_depot_save_flags+0xa7/0x810 lib/stackdepot.c:664 Code: f8 41 c1 c0 06 41 31 c0 01 ef 45 89 c1 41 c1 c1 08 44 29 c5 41 31 e9 41 01 f8 44 29 cf 44 89 c9 c1 c1 10 31 f9 45 01 c1 89 c8 c0 13 41 29 c8 44 31 c0 44 01 c9 41 29 c1 89 c5 c1 c5 04 44 31 RSP: 0018:ffffc900000074e8 EFLAGS: 00000296 RAX: 000000004c86db4e RBX: 0000000000000000 RCX: 000000004c86db4e RDX: ffffc9000000754c RSI: 000000000000001b RDI: 00000000fce3cfa2 RBP: 00000000ac73b5eb R08: 00000000a0891f0c R09: 00000000b575cf71 R10: 000000000000000f R11: fffffbfff1fde00f R12: ffffea0001f70000 R13: 0000000000000000 R14: ffffc90000007540 R15: ffffc90000007540 FS: 00007ffa78c1b6c0(0000) GS:ffff8881256f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000034e7c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: kasan_save_stack mm/kasan/common.c:58 [inline] kasan_save_track+0x4f/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_mempool_unpoison_object+0x9f/0x130 mm/kasan/common.c:564 kasan_mempool_unpoison_object include/linux/kasan.h:391 [inline] napi_skb_cache_get+0x3c8/0x780 net/core/skbuff.c:305 __alloc_skb+0x152/0x390 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+0x546/0x1900 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+0x2193/0x3000 drivers/net/virtio_net.c:3136 __napi_poll+0xae/0x340 net/core/dev.c:7668 napi_poll net/core/dev.c:7731 [inline] net_rx_action+0x627/0xf70 net/core/dev.c:7883 handle_softirqs+0x22a/0x7c0 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:rcu_read_unlock_special+0x1d/0x420 kernel/rcu/tree_plugin.h:770 Code: 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 10 65 8b 2d eb 2f 48 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 40 c2 ef 09 cc 49 89 RSP: 0018:ffffc900050ef280 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccc94a RDI: ffffffff8c073c80 RBP: ffff8881256f7000 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: ffffffff8e5605b8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b863b8e8 __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14f2/0x5050 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x164/0x360 kernel/sched/core.c:6960 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0x1ee/0x420 kernel/futex/waitwake.c:687 futex_wait+0x119/0x380 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa77d9af79 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:00007ffa78c1b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007ffa78015fa8 RCX: 00007ffa77d9af79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ffa78015fa8 RBP: 00007ffa78015fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffa78016038 R14: 00007ffff3f98540 R15: 00007ffff3f98628 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 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 01/24/2026 RIP: 0010:io_serial_in+0x77/0xc0 drivers/tty/serial/8250/8250_port.c:400 Code: e8 6e 03 92 fc 44 89 f9 d3 e3 49 83 c6 40 4c 89 f0 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 f7 e8 7f 2c fb fc 41 03 1e 89 da ec <0f> b6 c0 5b 41 5c 41 5e 41 5f c3 cc cc cc cc cc 44 89 f9 80 e1 07 RSP: 0018:ffffc900001775b8 EFLAGS: 00000006 RAX: 1ffffffff3466d05 RBX: 00000000000003f9 RCX: 0000000000000000 RDX: 00000000000003f9 RSI: 0000000000000000 RDI: 0000000000000020 RBP: ffffc90000177750 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: ffffffff853272b0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffffff9a336aa0 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8881257f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0899750020 CR3: 0000000034e7c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: serial_port_in include/linux/serial_core.h:806 [inline] serial8250_console_write+0x540/0x1ba0 drivers/tty/serial/8250/8250_port.c:3306 console_emit_next_record kernel/printk/printk.c:3129 [inline] console_flush_one_record kernel/printk/printk.c:3215 [inline] console_flush_all+0x718/0xb20 kernel/printk/printk.c:3289 __console_flush_and_unlock kernel/printk/printk.c:3319 [inline] console_unlock+0xd1/0x1c0 kernel/printk/printk.c:3359 vprintk_emit+0x485/0x560 kernel/printk/printk.c:2426 _printk+0xdd/0x130 kernel/printk/printk.c:2451 synchronize_rcu_expedited_stall+0x5f/0x1170 kernel/rcu/tree_exp.h:570 synchronize_rcu_expedited_wait kernel/rcu/tree_exp.h:668 [inline] rcu_exp_wait_wake kernel/rcu/tree_exp.h:687 [inline] rcu_exp_sel_wait_wake+0x897/0xe50 kernel/rcu/tree_exp.h:721 kthread_worker_fn+0x4ee/0xb00 kernel/kthread.c:1005 kthread+0x726/0x8b0 kernel/kthread.c:463 ret_from_fork+0x51b/0xa40 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 7301 Comm: syz.0.374 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x32/0x80 kernel/locking/spinlock.c:194 Code: 89 f3 49 89 fe 48 83 c7 18 48 8b 74 24 10 e8 55 a4 06 f6 4c 89 f7 e8 bd 18 07 f6 f7 c3 00 02 00 00 74 05 e8 70 75 32 f6 9c 58 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 e8 RSP: 0018:ffffc900000068e0 EFLAGS: 00000046 RAX: 0000000000000046 RBX: 0000000000000082 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffff9a2e1768 RBP: ffffc90000006a80 R08: ffffffff9a2e176b R09: 1ffffffff345c2ed R10: dffffc0000000000 R11: fffffbfff345c2ee R12: ffff888031c4e5f0 R13: dffffc0000000000 R14: ffffffff9a2e1768 R15: ffff8880b86282c0 FS: 00007ffa78c1b6c0(0000) GS:ffff8881256f7000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 0000000034e7c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: debug_hrtimer_deactivate kernel/time/hrtimer.c:443 [inline] debug_deactivate+0x1d/0x1e0 kernel/time/hrtimer.c:483 __run_hrtimer kernel/time/hrtimer.c:1745 [inline] __hrtimer_run_queues+0x2bc/0xc30 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x3d0 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:kasan_check_range+0x0/0x2c0 mm/kasan/generic.c:199 Code: eb ff 48 89 df 48 c7 c6 69 86 f3 8d e8 89 88 fa fe 90 0f 0b cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <0f> 1f 40 d6 55 41 57 41 56 41 55 41 54 53 b0 01 48 85 f6 0f 84 ae RSP: 0018:ffffc90000006cb0 EFLAGS: 00000202 RAX: 0000000000000001 RBX: 000000000000000d RCX: ffffffff819f9f5b RDX: 0000000000000001 RSI: 000000000000000d RDI: ffffe8ffffcb8018 RBP: ffffc90000006dd8 R08: 0000000000000004 R09: 0000000000000006 R10: dffffc0000000000 R11: fffffbfff175bf69 R12: ffffffff819f9f5b R13: 000000000000000e R14: ffffffff8badfb40 R15: ffffe8ffffcb8018 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2ab/0x3f0 include/trace/events/lock.h:50 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x379/0x3a0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:897 [inline] is_bpf_text_address+0x28d/0x2b0 kernel/bpf/core.c:749 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x30 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:385 arch_stack_walk+0xfb/0x150 arch/x86/kernel/stacktrace.c:26 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 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __do_kmalloc_node mm/slub.c:5657 [inline] __kmalloc_noprof+0x40c/0x7e0 mm/slub.c:5669 kmalloc_noprof include/linux/slab.h:961 [inline] kzalloc_noprof include/linux/slab.h:1094 [inline] cfg80211_inform_single_bss_data+0x934/0x1ab0 net/wireless/scan.c:2345 cfg80211_inform_bss_data+0x23f/0x3c20 net/wireless/scan.c:3228 cfg80211_inform_bss_frame_data+0x3c7/0x710 net/wireless/scan.c:3319 ieee80211_bss_info_update+0x794/0xa40 net/mac80211/scan.c:230 ieee80211_scan_rx+0x593/0xa20 net/mac80211/scan.c:359 __ieee80211_rx_handle_packet net/mac80211/rx.c:5287 [inline] ieee80211_rx_list+0x2508/0x3050 net/mac80211/rx.c:5544 ieee80211_rx_napi+0x1b1/0x3e0 net/mac80211/rx.c:5567 ieee80211_rx include/net/mac80211.h:5216 [inline] ieee80211_handle_queued_frames+0xe8/0x1e0 net/mac80211/main.c:452 tasklet_action_common+0x2da/0x4b0 kernel/softirq.c:925 handle_softirqs+0x22a/0x7c0 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:rcu_read_unlock_special+0x1d/0x420 kernel/rcu/tree_plugin.h:770 Code: 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 10 65 8b 2d eb 2f 48 11 f7 c5 00 00 f0 00 74 14 <48> 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d e9 40 c2 ef 09 cc 49 89 RSP: 0018:ffffc900050ef280 EFLAGS: 00000206 RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000000000001 RDX: 0000000000000000 RSI: ffffffff8dccc94a RDI: ffffffff8c073c80 RBP: ffff8881256f7000 R08: ffffffff8fef0077 R09: 1ffffffff1fde00e R10: dffffc0000000000 R11: fffffbfff1fde00f R12: ffffffff8e5605b8 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b863b8e8 __rcu_read_unlock+0x83/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:899 [inline] class_rcu_destructor include/linux/rcupdate.h:1195 [inline] unwind_next_frame+0x1aaf/0x23c0 arch/x86/kernel/unwind_orc.c:695 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3119 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3239 context_switch kernel/sched/core.c:5259 [inline] __schedule+0x14f2/0x5050 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x164/0x360 kernel/sched/core.c:6960 futex_do_wait kernel/futex/waitwake.c:358 [inline] __futex_wait+0x1ee/0x420 kernel/futex/waitwake.c:687 futex_wait+0x119/0x380 kernel/futex/waitwake.c:715 do_futex+0x333/0x420 kernel/futex/syscalls.c:130 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex+0x3a8/0x450 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xe2/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffa77d9af79 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:00007ffa78c1b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007ffa78015fa8 RCX: 00007ffa77d9af79 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007ffa78015fa8 RBP: 00007ffa78015fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffa78016038 R14: 00007ffff3f98540 R15: 00007ffff3f98628