watchdog: BUG: soft lockup - CPU#0 stuck for 111s! [syz.3.2879:14241] Modules linked in: irq event stamp: 5755627 hardirqs last enabled at (5755626): [] asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 hardirqs last disabled at (5755627): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1088 softirqs last enabled at (5724748): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last enabled at (5724748): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last enabled at (5724748): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 softirqs last disabled at (5724751): [] __do_softirq kernel/softirq.c:612 [inline] softirqs last disabled at (5724751): [] invoke_softirq kernel/softirq.c:452 [inline] softirqs last disabled at (5724751): [] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 CPU: 0 PID: 14241 Comm: syz.3.2879 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:100 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x485/0x2970 arch/x86/kernel/unwind_orc.c:494 Code: 4b 00 4d 29 e4 e9 a4 00 00 00 4c 89 e5 4c 89 64 24 28 48 ba 00 00 00 00 00 fc ff df 4c 8b 74 24 48 48 89 d8 4c 29 e0 48 89 c1 <48> c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 4d 8d 3c 44 4c 89 f8 RSP: 0018:ffffc90000007438 EFLAGS: 00000202 RAX: 0000000000000004 RBX: ffffffff8ea33be8 RCX: 0000000000000004 RDX: dffffc0000000000 RSI: ffffffff81df42c5 RDI: ffffffff81df42cf RBP: ffffffff8ea33be4 R08: ffffc900000075d0 R09: 0000000000000002 R10: 0000000000000004 R11: 0000000000000100 R12: ffffffff8ea33be4 R13: ffffffff81df42cf R14: ffffffff81df42c5 R15: ffffffff8ea33bec FS: 00007f1af48726c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000064000 CR3: 000000005f7cb000 CR4: 00000000003506f0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x144/0x190 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xaa/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:237 kasan_slab_free include/linux/kasan.h:164 [inline] slab_free_hook mm/slub.c:1811 [inline] slab_free_freelist_hook+0x130/0x1a0 mm/slub.c:1837 slab_free mm/slub.c:3830 [inline] kmem_cache_free+0xf8/0x270 mm/slub.c:3852 kfree_skb include/linux/skbuff.h:1264 [inline] hsr_forward_skb+0x1901/0x2140 net/hsr/hsr_forward.c:636 send_hsr_supervision_frame+0x5fb/0xb90 net/hsr/hsr_device.c:346 hsr_announce+0x198/0x350 net/hsr/hsr_device.c:402 call_timer_fn+0x189/0x540 kernel/time/timer.c:1701 expire_timers kernel/time/timer.c:1752 [inline] __run_timers+0x542/0x800 kernel/time/timer.c:2023 run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2036 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:schedule+0xb8/0x170 kernel/sched/core.c:6774 Code: 74 0a be 01 00 00 00 e8 f6 5b 7c f9 49 89 de 49 c1 ee 03 eb 09 48 f7 03 08 00 00 00 74 2c bf 01 00 00 00 e8 ca 2f cc f6 31 ff a3 b9 ff ff bf 01 00 00 00 e8 59 31 cc f6 43 80 3c 3e 00 74 d5 RSP: 0018:ffffc9000d9d75d8 EFLAGS: 00000246 RAX: 1ffff11004895299 RBX: ffff8880244a8000 RCX: ffffffff972d3400 RDX: dffffc0000000000 RSI: ffffffff8acacbe0 RDI: 0000000000000000 RBP: ffffc9000d9d7748 R08: ffffffff911cc50f R09: 1ffffffff22398a1 R10: dffffc0000000000 R11: fffffbfff22398a2 R12: ffffffff8e3c57e8 R13: ffff8880244a8000 R14: 1ffff11004895000 R15: dffffc0000000000 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747 register_netdev+0x13/0x50 net/core/dev.c:10448 loopback_net_init+0x75/0x150 drivers/net/loopback.c:220 ops_init+0x397/0x640 net/core/net_namespace.c:139 setup_net+0x3b6/0xa30 net/core/net_namespace.c:343 copy_net_ns+0x36d/0x5e0 net/core/net_namespace.c:520 create_new_namespaces+0x3d3/0x6f0 kernel/nsproxy.c:110 copy_namespaces+0x430/0x4a0 kernel/nsproxy.c:179 copy_process+0x1724/0x3dc0 kernel/fork.c:2511 kernel_clone+0x24b/0x8a0 kernel/fork.c:2917 __do_sys_clone kernel/fork.c:3060 [inline] __se_sys_clone kernel/fork.c:3044 [inline] __x64_sys_clone+0x1b7/0x230 kernel/fork.c:3044 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f1af399ce59 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:00007f1af4871fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f1af3c15fa0 RCX: 00007f1af399ce59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000045004400 RBP: 00007f1af3a32d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007f1af3c16038 R14: 00007f1af3c15fa0 R15: 00007ffd8f93bd08 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 14243 Comm: syz.0.2880 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026 RIP: 0010:__sanitizer_cov_trace_switch+0x81/0x120 kernel/kcov.c:349 Code: 00 00 00 b9 01 00 00 00 48 85 c0 0f 84 ae 00 00 00 41 57 41 56 41 54 53 48 8b 54 24 20 65 4c 8b 05 94 84 7c 7e 45 31 c9 eb 08 <49> ff c1 4c 39 c8 74 77 4e 8b 54 ce 10 65 44 8b 1d 82 84 7c 7e 41 RSP: 0018:ffffc900001f00d0 EFLAGS: 00000046 RAX: 0000000000000020 RBX: 000000953f2a3b04 RCX: 0000000000000005 RDX: ffffffff818a384d RSI: ffffffff8d17baa0 RDI: 0000000000000004 RBP: 0000000000000004 R08: ffff888028e50000 R09: 0000000000000007 R10: 0000000000000007 R11: 0000000000000100 R12: ffff88801ca525d8 R13: f800000000000000 R14: 00000000000005c8 R15: 00000000000f0a44 FS: 00007fcd922b26c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc57cb630 CR3: 000000002e33c000 CR4: 00000000003506e0 DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: check_buffer+0x24d/0x950 kernel/trace/ring_buffer.c:3497 __rb_reserve_next+0x511/0xd70 kernel/trace/ring_buffer.c:3626 rb_reserve_next_event kernel/trace/ring_buffer.c:3761 [inline] ring_buffer_lock_reserve+0xae1/0xed0 kernel/trace/ring_buffer.c:3820 __trace_buffer_lock_reserve kernel/trace/trace.c:996 [inline] trace_event_buffer_lock_reserve+0x1d2/0x6f0 kernel/trace/trace.c:2905 trace_event_buffer_reserve+0x2ac/0x3d0 kernel/trace/trace_events.c:661 do_trace_event_raw_event_bpf_trace_printk kernel/trace/bpf_trace.h:11 [inline] trace_event_raw_event_bpf_trace_printk+0x116/0x230 kernel/trace/bpf_trace.h:11 trace_bpf_trace_printk+0x13e/0x1a0 kernel/trace/bpf_trace.h:11 ____bpf_trace_printk kernel/trace/bpf_trace.c:388 [inline] bpf_trace_printk+0x142/0x1c0 kernel/trace/bpf_trace.c:371 bpf_prog_b1bcf1c1da0a8648+0x40/0x44 bpf_dispatcher_nop_func include/linux/bpf.h:1224 [inline] __bpf_prog_run include/linux/filter.h:616 [inline] bpf_prog_run include/linux/filter.h:623 [inline] bpf_prog_run_array include/linux/bpf.h:1994 [inline] trace_call_bpf+0x333/0x6c0 kernel/trace/bpf_trace.c:143 perf_trace_run_bpf_submit+0x7a/0x1c0 kernel/events/core.c:10295 perf_trace_preemptirq_template+0x269/0x330 include/trace/events/preemptirq.h:14 trace_irq_enable+0xbb/0xe0 include/trace/events/preemptirq.h:40 trace_hardirqs_on+0x18/0x40 kernel/trace/trace_preemptirq.c:56 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:mac80211_hwsim_tx_frame_no_nl+0x7d6/0x11a0 drivers/net/wireless/virtual/mac80211_hwsim.c:1802 Code: 00 00 00 00 4c 39 6c 24 30 74 70 4d 8d bd 08 3d 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 0f 85 82 05 00 00 41 80 3f 00 <74> 59 4d 8d bd 09 3d 00 00 4c 89 f8 48 c1 e8 03 42 0f b6 04 30 84 RSP: 0018:ffffc900001f09a0 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffff8880556535b8 RCX: ffff888028e50000 RDX: 0000000000000100 RSI: 0000000000000004 RDI: ffffc900001f0920 RBP: ffffc900001f0b30 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200003e124 R12: 1ffff9200003e148 R13: ffff88807ae8b320 R14: dffffc0000000000 R15: ffff88807ae8f028 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2176 mac80211_hwsim_beacon_tx+0x3e9/0x780 drivers/net/wireless/virtual/mac80211_hwsim.c:2269 __iterate_interfaces+0x243/0x500 net/mac80211/util.c:766 ieee80211_iterate_active_interfaces_atomic+0xdb/0x180 net/mac80211/util.c:802 mac80211_hwsim_beacon+0xbb/0x1b0 drivers/net/wireless/virtual/mac80211_hwsim.c:2295 __run_hrtimer kernel/time/hrtimer.c:1754 [inline] __hrtimer_run_queues+0x520/0xc40 kernel/time/hrtimer.c:1818 hrtimer_run_softirq+0x187/0x2b0 kernel/time/hrtimer.c:1835 handle_softirqs+0x280/0x820 kernel/softirq.c:578 __do_softirq kernel/softirq.c:612 [inline] invoke_softirq kernel/softirq.c:452 [inline] __irq_exit_rcu+0xd3/0x190 kernel/softirq.c:661 irq_exit_rcu+0x9/0x20 kernel/softirq.c:673 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline] sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:schedule_debug kernel/sched/core.c:5938 [inline] RIP: 0010:__schedule+0x150/0x45a0 kernel/sched/core.c:6591 Code: 74 08 48 89 df e8 a0 53 4f f7 48 8b 1b 48 89 d8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 df e8 87 53 4f f7 48 81 3b 9d 6e ac 57 <0f> 85 7d 16 00 00 45 85 ff 44 89 7c 24 6c 75 4c 48 8b 44 24 30 48 RSP: 0018:ffffc9000da773c0 EFLAGS: 00000246 RAX: 1ffff92001b4e000 RBX: ffffc9000da70000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc9000da77560 RBP: ffffc9000da775d0 R08: ffffc9000da7755f R09: 0000000000000000 R10: ffffc9000da77550 R11: fffff52001b4eeac R12: 1ffff92001b4ee98 R13: ffff8880b8f00000 R14: dffffc0000000000 R15: 0000000000000001 preempt_schedule_irq+0xbf/0x150 kernel/sched/core.c:7010 irqentry_exit+0x67/0x70 kernel/entry/common.c:438 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687 RIP: 0010:page_counter_try_charge+0x7a/0x2c0 mm/page_counter.c:120 Code: 4d 0f c1 2c 24 49 8d ac 24 98 00 00 00 48 89 e8 48 c1 e8 03 80 3c 18 00 74 08 48 89 ef e8 be 53 f9 ff 4c 03 2c 24 48 8b 6d 00 <4c> 89 ef 48 89 ee e8 6b 16 a1 ff 4c 89 e7 49 39 ed 0f 87 9d 00 00 RSP: 0018:ffffc9000da77740 EFLAGS: 00000206 RAX: 1ffff11003deac53 RBX: dffffc0000000000 RCX: ffffffff81e6175b RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88801ef56200 RBP: 0007ffffffffffff R08: ffff88801ef56207 R09: 1ffff11003deac40 R10: dffffc0000000000 R11: ffffed1003deac41 R12: ffff88801ef56200 R13: 0000000000000be7 R14: 0000000000000040 R15: 1ffffffff1a2b959 try_charge_memcg+0x119c/0x1800 mm/memcontrol.c:2688 obj_cgroup_charge_pages mm/memcontrol.c:3138 [inline] __memcg_kmem_charge_page+0x224/0x380 mm/memcontrol.c:3164 __alloc_pages+0x226/0x460 mm/page_alloc.c:4517 pipe_write+0x62b/0x1b10 fs/pipe.c:502 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x46c/0x990 fs/read_write.c:584 ksys_write+0x150/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fcd9139ce59 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:00007fcd922b2028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fcd91615fa0 RCX: 00007fcd9139ce59 RDX: 00000000fffffdef RSI: 00002000000001c0 RDI: 0000000000000000 RBP: 00007fcd91432d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fcd91616038 R14: 00007fcd91615fa0 R15: 00007ffe159df5d8