watchdog: BUG: soft lockup - CPU#1 stuck for 132s! [syz.1.117:6406] Modules linked in: irq event stamp: 18749295 hardirqs last enabled at (18749294): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (18749295): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (18662384): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (18662384): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (18662384): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (18662387): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (18662387): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (18662387): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 1 UID: 0 PID: 6406 Comm: syz.1.117 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:write_comp_data kernel/kcov.c:246 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x17/0x90 kernel/kcov.c:314 Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 15 c8 dc 56 11 65 8b 0d e9 dc 56 11 <81> e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b 83 ba a4 16 00 00 RSP: 0018:ffffc90000a086f8 EFLAGS: 00000246 RAX: ffffffff81cf9fa5 RBX: 000000000000002c RCX: 0000000000000103 RDX: ffff888030903d00 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffc90000a08cf8 R09: 0000000000000000 R10: ffffc90000a089d8 R11: fffff5200014113d R12: dffffc0000000000 R13: dffffc0000000000 R14: ffffc90000a087a0 R15: ffffc90000a087c0 FS: 00007ffaa76866c0(0000) GS:ffff888125557000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055556de109e8 CR3: 000000007da52000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_buf_alloc+0x65/0x280 kernel/trace/trace_event_perf.c:411 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x1a0/0x410 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+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/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 mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2685 [inline] slab_free mm/slub.c:6165 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6295 dst_destroy+0x235/0x350 net/core/dst.c:122 rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869 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:rcu_is_watching_curr_cpu include/linux/context_tracking.h:128 [inline] RIP: 0010:rcu_is_watching+0x3a/0xb0 kernel/rcu/tree.c:752 Code: e8 0b 8b 04 0a 89 c3 83 f8 08 73 65 49 bf 00 00 00 00 00 fc ff df 4c 8d 34 dd 90 37 1b 8e 4c 89 f0 48 c1 e8 03 42 80 3c 38 00 <74> 08 4c 89 f7 e8 2c 3c 85 00 48 c7 c3 98 c9 1d 93 49 03 1e 48 89 RSP: 0018:ffffc9000c43eef0 EFLAGS: 00000246 RAX: 1ffffffff1c366f3 RBX: 0000000000000001 RCX: 0000000000000002 RDX: ffffc9000cf81000 RSI: ffffffff8c27d0e0 RDI: ffffffff8c27d0a0 RBP: dffffc0000000000 R08: ffffc9000c43eb97 R09: 0000000000000000 R10: ffffc9000c43eb88 R11: fffff52001887d73 R12: ffffffff8e75e5e0 R13: ffffffff81767e95 R14: ffffffff8e1b3798 R15: dffffc0000000000 trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x4b/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/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:3131 [inline] call_rcu+0xee/0x890 kernel/rcu/tree.c:3251 context_switch kernel/sched/core.c:5301 [inline] __schedule+0x15e5/0x52d0 kernel/sched/core.c:6911 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238 irqentry_exit+0x599/0x620 kernel/entry/common.c:239 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__srcu_check_read_flavor+0x87/0x250 kernel/rcu/srcutree.c:770 Code: 3c 28 00 74 08 4c 89 e7 e8 16 c4 85 00 49 8b 2c 24 4c 89 7c 24 08 4d 8d 24 2f 49 83 c4 20 4c 89 e0 48 c1 e8 03 42 0f b6 04 28 <84> c0 0f 85 0a 01 00 00 41 8b 04 24 49 83 c6 10 4d 89 f7 49 c1 ef RSP: 0018:ffffc9000c43f788 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 0000000080000001 RDX: ffffffff909d3c00 RSI: 0000000000000004 RDI: ffffffff8e7bd940 RBP: ffffffff931d2180 R08: 0000000000000022 R09: ffffffff8e75e5e0 R10: ffffc9000c43f448 R11: ffffffff81b0d030 R12: ffff8880b87291a0 R13: dffffc0000000000 R14: ffffffff8e7bd940 R15: ffff888125557000 srcu_check_read_flavor include/linux/srcutree.h:374 [inline] srcu_read_lock_fast_notrace include/linux/srcu.h:385 [inline] class_srcu_fast_notrace_constructor include/linux/srcu.h:634 [inline] __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x36c/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/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 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:5260 [inline] __kmalloc_noprof+0x35c/0x760 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] sk_prot_alloc+0xe7/0x210 net/core/sock.c:2245 sk_alloc+0x3a/0x390 net/core/sock.c:2301 can_create+0x1ca/0x5d0 net/can/af_can.c:158 __sock_create+0x4b2/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socket_create net/socket.c:1700 [inline] __sys_socket+0xd6/0x1b0 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+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ffaa679c819 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:00007ffaa7686028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007ffaa6a15fa0 RCX: 00007ffaa679c819 RDX: 0000000000000001 RSI: 0000000000000003 RDI: 000000000000001d RBP: 00007ffaa6832c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffaa6a16038 R14: 00007ffaa6a15fa0 R15: 00007ffe20659368 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 6393 Comm: syz.0.113 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:__lock_acquire+0x6d5/0x2cf0 kernel/locking/lockdep.c:5207 Code: ba 08 00 00 00 e8 6b 44 00 00 31 ed 85 c0 0f 84 6d 0d 00 00 83 3d ea 5e 86 18 00 75 13 48 63 44 24 18 48 0f a3 05 fb ce 82 12 <0f> 83 8a 1e 00 00 49 8b 9e 48 0b 00 00 48 83 7c 24 28 00 75 19 83 RSP: 0018:ffffc90000006f30 EFLAGS: 00000047 RAX: 0000000000000070 RBX: 0000000000000004 RCX: ffffffff93c5bb90 RDX: 0000000000000008 RSI: ffff888058ff6778 RDI: ffff888058ff5b80 RBP: 0000000000000000 R08: ffffffff81b289c3 R09: ffff8880b8628298 R10: dffffc0000000000 R11: fffffbfff2023997 R12: 0000000000000003 R13: ffff888058ff6778 R14: ffff888058ff5b80 R15: 0000000000000003 FS: 00007f14204fa6c0(0000) GS:ffff888125457000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc41c016038 CR3: 000000003591c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868 __raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170 __run_hrtimer kernel/time/hrtimer.c:1789 [inline] __hrtimer_run_queues+0x603/0xcc0 kernel/time/hrtimer.c:1849 hrtimer_interrupt+0x42b/0x1010 kernel/time/hrtimer.c:1911 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1045 [inline] __sysvec_apic_timer_interrupt+0x102/0x460 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:lock_release+0x2e0/0x3d0 kernel/locking/lockdep.c:5893 Code: e8 05 74 0d 0a f7 c3 00 02 00 00 74 b9 65 48 8b 05 85 d1 7a 11 48 3b 44 24 28 75 44 fb 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f <5d> c3 cc cc cc cc cc 48 8d 3d 32 65 73 0e 67 48 0f b9 3a 83 3d f6 RSP: 0018:ffffc90000007488 EFLAGS: 00000286 RAX: 6834c5156ad09900 RBX: ffffffff91030201 RCX: 0000000000000102 RDX: 0000000000000004 RSI: ffffffff8e16b21c RDI: ffffffff8c27d100 RBP: ffff888058ff6778 R08: ffffffff9011ccb7 R09: 1ffffffff2023996 R10: dffffc0000000000 R11: fffffbfff2023997 R12: ffffc90000007c08 R13: ffffc90000000000 R14: ffffc90000007568 R15: ffffffff81767e95 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] class_rcu_destructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0x1aaa/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 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 skb_copy+0x188/0x800 net/core/skbuff.c:2195 mac80211_hwsim_tx_frame_no_nl+0xd00/0x11f0 drivers/net/wireless/virtual/mac80211_hwsim.c:1891 mac80211_hwsim_tx_frame+0x1b5/0x200 drivers/net/wireless/virtual/mac80211_hwsim.c:2264 mac80211_hwsim_beacon_tx+0x3e8/0x870 drivers/net/wireless/virtual/mac80211_hwsim.c:2365 __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:__sanitizer_cov_trace_pc+0x5c/0x70 kernel/kcov.c:235 Code: 80 16 00 00 83 fa 02 75 21 48 8b 91 88 16 00 00 48 8b 32 48 8d 7e 01 8b 89 84 16 00 00 48 39 cf 73 08 48 89 3a 48 89 44 f2 08 4f 69 ec 09 cc 66 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 RSP: 0018:ffffc900060974f8 EFLAGS: 00000287 RAX: ffffffff81f90e48 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9000d382000 RSI: 0000000000023f39 RDI: 0000000000023f3a RBP: ffffc900060977c8 R08: ffffffff9011ccb7 R09: 1ffffffff2023996 R10: dffffc0000000000 R11: fffffbfff2023997 R12: ffff88807cc33978 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8633418 perf_tp_event+0x708/0x2a90 kernel/events/core.c:11403 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:11334 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x32d/0x410 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+0x392/0x3d0 kernel/locking/lockdep.c:5879 rcu_lock_release include/linux/rcupdate.h:322 [inline] rcu_read_unlock include/linux/rcupdate.h:881 [inline] page_ext_put+0xa3/0xc0 mm/page_ext.c:579 __reset_page_owner+0x67/0x1f0 mm/page_owner.c:312 reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1433 [inline] __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978 __slab_free+0x263/0x2b0 mm/slub.c:5573 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 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_noprof+0x2bc/0x650 mm/slub.c:4873 sk_prot_alloc+0x57/0x210 net/core/sock.c:2239 sk_alloc+0x3a/0x390 net/core/sock.c:2301 tipc_sk_create+0x10a/0x27a0 net/tipc/socket.c:486 __sock_create+0x4b2/0x9d0 net/socket.c:1605 sock_create net/socket.c:1663 [inline] __sys_socketpair+0x1c4/0x560 net/socket.c:1810 __do_sys_socketpair net/socket.c:1863 [inline] __se_sys_socketpair net/socket.c:1860 [inline] __x64_sys_socketpair+0x9b/0xb0 net/socket.c:1860 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: 0033:0x7f141f59c819 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:00007f14204fa028 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffda RBX: 00007f141f815fa0 RCX: 00007f141f59c819 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 000000000000001e RBP: 00007f141f632c91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000240 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f141f816038 R14: 00007f141f815fa0 R15: 00007ffd4bb34c98