watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.1.2:5960] Modules linked in: irq event stamp: 15468581 hardirqs last enabled at (15468580): [] irqentry_exit+0x63/0x90 kernel/entry/common.c:357 hardirqs last disabled at (15468581): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (14577286): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (14577286): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (14577286): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 softirqs last disabled at (14577289): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (14577289): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (14577289): [] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 5960 Comm: syz.1.2 Not tainted 6.14.0-syzkaller-g0a87d6bb6fd2 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:lock_acquire+0x167/0x2f0 arch/x86/include/asm/irqflags.h:-1 Code: c7 44 24 10 00 00 00 00 9c 8f 44 24 10 f7 44 24 10 00 02 00 00 0f 85 fd 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 65 48 8b 45 00 <48> 3b 44 24 38 0f 85 72 01 00 00 48 83 c4 40 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000007048 EFLAGS: 00000206 RAX: 0b85424acab82300 RBX: ffffffff8ed3dfe0 RCX: 0b85424acab82300 RDX: 0000000000000000 RSI: ffffffff8e4fa108 RDI: ffffffff8ca1ac00 RBP: ffffffff93687020 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 0000000000000246 R15: 0000000000000000 FS: 00007f40140376c0(0000) GS:ffff888124f99000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555dfbb808 CR3: 0000000032404000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xd5/0x23b0 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11e/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x11a/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2389 [inline] slab_free mm/slub.c:4646 [inline] kmem_cache_free+0x197/0x410 mm/slub.c:4748 kfree_skb_reason include/linux/skbuff.h:1279 [inline] __netif_receive_skb_core+0x43ec/0x4bb0 net/core/dev.c:5865 __netif_receive_skb_one_core net/core/dev.c:5889 [inline] __netif_receive_skb+0x130/0x670 net/core/dev.c:6004 process_backlog+0x664/0x15c0 net/core/dev.c:6356 __napi_poll+0xcb/0x480 net/core/dev.c:7328 napi_poll net/core/dev.c:7392 [inline] net_rx_action+0x89d/0x1240 net/core/dev.c:7514 handle_softirqs+0x2d6/0x9b0 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xfb/0x220 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:__schedule+0xc/0x5240 kernel/sched/core.c:6646 Code: ff cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 41 57 41 56 <41> 55 41 54 53 48 83 e4 e0 48 81 ec 00 02 00 00 89 7c 24 48 48 c7 RSP: 0018:ffffc90004a4f560 EFLAGS: 00000286 RAX: 0b85424acab82300 RBX: 1ffff92000949eb8 RCX: 0000000000000007 RDX: 0000000000000007 RSI: ffffffff8e698fab RDI: 0000000000000001 RBP: ffffc90004a4f570 R08: ffffffff905fbf77 R09: 1ffffffff20bf7ee R10: dffffc0000000000 R11: fffffbfff20bf7ef R12: dffffc0000000000 R13: 1ffff92000949eb0 R14: 1ffff92000949eb4 R15: ffffc90004a4f5a0 preempt_schedule_irq+0xfe/0x1c0 kernel/sched/core.c:7090 irqentry_exit+0x5e/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_schedule+0x5e/0xf0 kernel/sched/core.c:6964 Code: c7 04 24 b3 8a b5 41 48 c7 44 24 08 80 76 4e 8e 48 c7 44 24 10 e0 ef 30 8c 48 89 e3 48 c1 eb 03 48 b8 f1 f1 f1 f1 00 f3 f3 f3 <4a> 89 04 23 65 8b 05 e7 7f 37 07 a9 ff ff ff 7f 75 41 4c 8d 74 24 RSP: 0018:ffffc90004a4f700 EFLAGS: 00000a02 RAX: f3f3f300f1f1f1f1 RBX: 1ffff92000949ee0 RCX: 0000000000000001 RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001 RBP: ffffc90004a4f798 R08: ffff8880120e957f R09: 1ffff1100241d2af R10: dffffc0000000000 R11: ffffed100241d2b0 R12: dffffc0000000000 R13: dffffc0000000000 R14: ffff88802b523c01 R15: ffffffff93687020 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 __down_read_common kernel/locking/rwsem.c:1255 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x87e/0xa50 kernel/locking/rwsem.c:1526 mmap_read_lock include/linux/mmap_lock.h:184 [inline] acct_collect+0x1df/0x850 kernel/acct.c:597 do_exit+0x91e/0x28c0 kernel/exit.c:933 do_group_exit+0x207/0x2c0 kernel/exit.c:1103 get_signal+0x1696/0x1730 kernel/signal.c:3036 arch_do_signal_or_restart+0x98/0x840 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] irqentry_exit_to_user_mode+0x7e/0x250 kernel/entry/common.c:231 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0033:0x7f401305cda0 Code: 96 12 ff ff 48 8d 3d 41 27 1b 00 e8 8a 12 ff ff 48 8d 3d 17 23 1b 00 e8 7e 12 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 <41> 56 41 54 55 53 48 83 ec 68 48 63 57 28 48 89 3c 24 48 8d 74 24 RSP: 002b:00007f40140370e8 EFLAGS: 00000246 RAX: 0000000000000001 RBX: 00007f40133a5fa8 RCX: 00007f401318d169 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f40133a5fa0 RBP: 00007f40133a5fa0 R08: 7fffffffffffffff R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f40133a5fac R13: 0000000000000000 R14: 00007ffc8c51f9c0 R15: 00007ffc8c51faa8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.14.0-syzkaller-g0a87d6bb6fd2 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x1bac/0x2d40 kernel/smp.c:885 Code: 03 84 c0 75 7e 45 8b 65 00 44 89 e6 83 e6 01 31 ff e8 c8 e2 0b 00 41 83 e4 01 4c 8b 64 24 68 75 07 e8 78 de 0b 00 eb 41 f3 90 <48> b8 00 00 00 00 00 fc ff df 0f b6 04 03 84 c0 75 11 41 f7 45 00 RSP: 0018:ffffc90000127640 EFLAGS: 00000293 RAX: ffffffff81b778cd RBX: 1ffff110170c823d RCX: ffff88801c688000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000127840 R08: ffffffff81b77898 R09: 1ffffffff20bf7ee R10: dffffc0000000000 R11: fffffbfff20bf7ef R12: ffff8880b873ad08 R13: ffff8880b86411e8 R14: ffff8880b873ad00 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125099000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fda54ec2978 CR3: 000000000eb38000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 text_poke_bp_batch+0x9f1/0xb30 arch/x86/kernel/alternative.c:-1 text_poke_flush arch/x86/kernel/alternative.c:2856 [inline] text_poke_finish+0x30/0x50 arch/x86/kernel/alternative.c:2863 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 static_key_enable_cpuslocked+0x136/0x260 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate+0xc0/0x250 mm/kfence/core.c:850 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xac3/0x18e0 kernel/workqueue.c:3319 worker_thread+0x870/0xd50 kernel/workqueue.c:3400 kthread+0x7b7/0x940 kernel/kthread.c:464 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245