ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 watchdog: BUG: soft lockup - CPU#0 stuck for 245s! [kworker/u8:15:8168] Modules linked in: irq event stamp: 2635558 hardirqs last enabled at (2635557): [] irqentry_exit+0x3b/0x90 kernel/entry/common.c:357 hardirqs last disabled at (2635558): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (2635556): [] softirq_handle_end kernel/softirq.c:425 [inline] softirqs last enabled at (2635556): [] handle_softirqs+0x5be/0x8e0 kernel/softirq.c:607 softirqs last disabled at (2635531): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (2635531): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (2635531): [] __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 8168 Comm: kworker/u8:15 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:rep_nop arch/x86/include/asm/vdso/processor.h:13 [inline] RIP: 0010:cpu_relax arch/x86/include/asm/vdso/processor.h:18 [inline] RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0x4a3/0x1290 kernel/smp.c:885 Code: e5 01 89 ee e8 3e 13 0c 00 85 ed 74 48 48 8b 44 24 20 49 89 c4 83 e0 07 49 c1 ec 03 48 89 c5 4d 01 f4 83 c5 03 e8 dd 17 0c 00 90 41 0f b6 04 24 40 38 c5 7c 08 84 c0 0f 85 de 0b 00 00 8b 43 RSP: 0018:ffffc9000313f938 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b853f880 RCX: ffffffff81af2d89 RDX: ffff88802b54bc00 RSI: ffffffff81af2d63 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10170a7f11 R13: 0000000000000001 R14: dffffc0000000000 R15: ffff8880b843b180 FS: 0000000000000000(0000) GS:ffff8881249e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555562dde588 CR3: 000000000e180000 CR4: 0000000000350ef0 Call Trace: on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2757 [inline] text_poke_bp_batch+0x220/0x760 arch/x86/kernel/alternative.c:2967 text_poke_flush arch/x86/kernel/alternative.c:3158 [inline] text_poke_flush arch/x86/kernel/alternative.c:3155 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:3165 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x376/0x550 kernel/jump_label.c:919 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210 static_key_enable+0x1a/0x20 kernel/jump_label.c:223 toggle_allocation_gate mm/kfence/core.c:850 [inline] toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:842 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238 process_scheduled_works kernel/workqueue.c:3319 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400 kthread+0x3c5/0x780 kernel/kthread.c:464 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 9263 Comm: syz.4.1040 Not tainted 6.15.0-rc6-syzkaller-00346-g5723cc3450bc #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:rcu_is_watching+0x0/0xc0 kernel/rcu/tree.c:732 Code: a2 3c 8e e8 b2 e7 5f 03 e9 51 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 53 65 ff 05 23 10 03 12 e8 7e 1c ca 09 48 c7 c3 e8 RSP: 0018:ffffc90000a08d88 EFLAGS: 00000046 RAX: 0000000080010000 RBX: 0000000000000001 RCX: ffffffff897fae41 RDX: ffff888034bc5a00 RSI: ffffffff897fb027 RDI: 0000000000000005 RBP: ffff8880296d1c00 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: 184f979d37e5e5c9 R13: 184f979d37e5e5c9 R14: 0000000000000002 R15: ffff88807ad19010 FS: 00007fdb2f68c6c0(0000) GS:ffff888124ae0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000062030 CR3: 0000000012222000 CR4: 0000000000350ef0 Call Trace: rcu_read_unlock include/linux/rcupdate.h:869 [inline] advance_sched+0x8bc/0xc80 net/sched/sch_taprio.c:987 __run_hrtimer kernel/time/hrtimer.c:1761 [inline] __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825 hrtimer_interrupt+0x397/0x8e0 kernel/time/hrtimer.c:1887 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10b/0x3f0 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:memory_is_nonzero mm/kasan/generic.c:103 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x64/0x1a0 mm/kasan/generic.c:189 Code: 89 fd 48 b8 00 00 00 00 00 fc ff df 4d 89 d1 48 c1 ed 03 49 c1 e9 03 48 01 c5 49 01 c1 48 89 e8 49 8d 59 01 48 89 da 48 29 ea <48> 83 fa 10 0f 8e 8d 00 00 00 41 89 eb 41 83 e3 07 0f 85 9a 00 00 RSP: 0018:ffffc90003937a40 EFLAGS: 00000202 RAX: fffff52000726f55 RBX: fffff52000726f5c RCX: ffffffff84cef7b7 RDX: 0000000000000007 RSI: 0000000000000038 RDI: ffffc90003937aa8 RBP: fffff52000726f55 R08: 0000000000000001 R09: fffff52000726f5b R10: ffffc90003937adf R11: 0000000000000000 R12: 0000000000000000 R13: ffffc90003937aa8 R14: ffffc90003937b90 R15: ffffc90003937aa8 instrument_copy_from_user_before include/linux/instrumented.h:129 [inline] _inline_copy_from_user include/linux/uaccess.h:177 [inline] _copy_from_user+0x87/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_msghdr_from_user+0x98/0x160 net/socket.c:2496 recvmsg_copy_msghdr net/socket.c:2752 [inline] ___sys_recvmsg+0xdb/0x1a0 net/socket.c:2824 do_recvmmsg+0x2fe/0x740 net/socket.c:2923 __sys_recvmmsg net/socket.c:2997 [inline] __do_sys_recvmmsg net/socket.c:3020 [inline] __se_sys_recvmmsg net/socket.c:3013 [inline] __x64_sys_recvmmsg+0x22a/0x280 net/socket.c:3013 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdb2e78e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdb2f68c038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 00007fdb2e9b6080 RCX: 00007fdb2e78e969 RDX: 0000000000010106 RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fdb2e810ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fdb2e9b6080 R15: 00007fff977924e8