watchdog: BUG: soft lockup - CPU#0 stuck for 122s! [syz-executor.5:30884] Modules linked in: irq event stamp: 21658847 hardirqs last enabled at (21658846): [] irqentry_exit+0x3b/0x80 kernel/entry/common.c:435 hardirqs last disabled at (21658847): [] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076 softirqs last enabled at (516842): [] softirq_handle_end kernel/softirq.c:399 [inline] softirqs last enabled at (516842): [] __do_softirq+0x597/0x8de kernel/softirq.c:582 softirqs last disabled at (516845): [] invoke_softirq kernel/softirq.c:427 [inline] softirqs last disabled at (516845): [] __irq_exit_rcu kernel/softirq.c:632 [inline] softirqs last disabled at (516845): [] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 CPU: 0 PID: 30884 Comm: syz-executor.5 Not tainted 6.7.0-rc3-syzkaller-00764-g32fa05839862 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194 Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 e6 a9 e4 f6 48 89 df e8 4e 21 e5 f6 f7 c5 00 02 00 00 75 1f 9c 58 f6 c4 02 75 2f 01 00 00 00 e8 65 da d6 f6 65 8b 05 86 56 80 75 85 c0 74 12 5b RSP: 0018:ffffc900000078c8 EFLAGS: 00000246 RAX: 0000000000000006 RBX: ffffffff92a22780 RCX: 1ffffffff23eca8c RDX: 0000000000000000 RSI: ffffffff8accb7e0 RDI: ffffffff8b2f2080 RBP: 0000000000000282 R08: 0000000000000001 R09: fffffbfff23e2fe7 R10: ffffffff91f17f3f R11: 0000000000000006 R12: dffffc0000000000 R13: 0000000000017e58 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcb8db79db8 CR3: 000000000cd77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __debug_check_no_obj_freed lib/debugobjects.c:1042 [inline] debug_check_no_obj_freed+0x245/0x4c0 lib/debugobjects.c:1063 slab_free_hook mm/slub.c:1775 [inline] slab_free_freelist_hook+0x18c/0x1e0 mm/slub.c:1826 slab_free mm/slub.c:3809 [inline] kmem_cache_free+0xf8/0x350 mm/slub.c:3831 kfree_skbmem+0x166/0x1b0 net/core/skbuff.c:1036 tcp_wmem_free_skb include/net/tcp.h:312 [inline] tcp_rtx_queue_purge net/ipv4/tcp.c:2949 [inline] tcp_write_queue_purge+0x63b/0xd60 net/ipv4/tcp.c:2962 tcp_write_err net/ipv4/tcp_timer.c:79 [inline] tcp_write_timeout net/ipv4/tcp_timer.c:295 [inline] tcp_retransmit_timer+0x10ce/0x4050 net/ipv4/tcp_timer.c:577 tcp_write_timer_handler net/ipv4/tcp_timer.c:693 [inline] tcp_write_timer_handler+0x55a/0xa50 net/ipv4/tcp_timer.c:667 tcp_write_timer+0xa6/0x2b0 net/ipv4/tcp_timer.c:710 call_timer_fn+0x193/0x590 kernel/time/timer.c:1700 expire_timers kernel/time/timer.c:1751 [inline] __run_timers+0x764/0xb20 kernel/time/timer.c:2022 run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035 __do_softirq+0x21a/0x8de kernel/softirq.c:553 invoke_softirq kernel/softirq.c:427 [inline] __irq_exit_rcu kernel/softirq.c:632 [inline] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644 sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1076 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645 RIP: 0010:_compound_head include/linux/page-flags.h:249 [inline] RIP: 0010:PageSlab include/linux/page-flags.h:481 [inline] RIP: 0010:page_table_check_clear mm/page_table_check.c:74 [inline] RIP: 0010:page_table_check_clear+0x1d3/0x9b0 mm/page_table_check.c:61 Code: 48 89 df e8 cf f0 ff ff 4c 89 f2 49 89 c4 48 c1 ea 03 48 b8 00 00 00 00 00 fc ff df 80 3c 02 00 0f 85 06 07 00 00 4c 8b 7b 08 <31> ff 4c 89 fd 83 e5 01 48 89 ee e8 2d 71 9e ff 48 85 ed 0f 85 b1 RSP: 0018:ffffc900049bf610 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffea000102c900 RCX: ffffffff81e91264 RDX: 1ffffd4000205921 RSI: ffffffff81e91280 RDI: 0000000000000007 RBP: 0000000000000008 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000003 R12: ffff888015432220 R13: 0000000000000001 R14: ffffea000102c908 R15: 0000000000000000 __page_table_check_pte_clear+0xef/0x100 mm/page_table_check.c:158 page_table_check_pte_clear include/linux/page_table_check.h:49 [inline] ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1301 [inline] zap_pte_range mm/memory.c:1440 [inline] zap_pmd_range mm/memory.c:1582 [inline] zap_pud_range mm/memory.c:1611 [inline] zap_p4d_range mm/memory.c:1632 [inline] unmap_page_range+0x184f/0x2b50 mm/memory.c:1653 unmap_single_vma+0x194/0x2b0 mm/memory.c:1699 unmap_vmas+0x229/0x470 mm/memory.c:1743 exit_mmap+0x1ad/0xa70 mm/mmap.c:3308 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2ae0 kernel/exit.c:858 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 get_signal+0x23be/0x2790 kernel/signal.c:2904 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:88 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fb60707cba9 Code: Unable to access opcode bytes at 0x7fb60707cb7f. RSP: 002b:00007fb607d400c8 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffea RBX: 00007fb60719c050 RCX: 00007fb60707cba9 RDX: 000000000000000b RSI: 00000000000028b0 RDI: 00000000200000c0 RBP: 00007fb6070c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007fb60719c050 R15: 00007ffd2d34bca8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13298 Comm: kworker/u4:38 Not tainted 6.7.0-rc3-syzkaller-00764-g32fa05839862 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:173 [inline] RIP: 0010:write_comp_data+0x12/0x80 kernel/kcov.c:236 Code: 04 25 c0 bc 03 00 48 8b 80 f0 15 00 00 c3 66 2e 0f 1f 84 00 00 00 00 00 49 89 d2 49 89 f8 49 89 f1 65 48 8b 14 25 c0 bc 03 00 <65> 8b 05 7f 2c 7c 7e a9 00 01 ff 00 74 0f f6 c4 01 74 59 8b 82 fc RSP: 0018:ffffc900159bf928 EFLAGS: 00000202 RAX: 0000000000000001 RBX: ffff8880b98441a0 RCX: ffffffff817bd598 RDX: ffff88807c318000 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000006 R12: ffffed1017308835 R13: 0000000000000001 R14: ffff8880b98441a8 R15: ffff8880b993d8c0 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b3132f000 CR3: 000000000cd77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:311 [inline] smp_call_function_many_cond+0x508/0x1550 kernel/smp.c:855 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023 on_each_cpu include/linux/smp.h:71 [inline] text_poke_sync arch/x86/kernel/alternative.c:2006 [inline] text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2216 text_poke_flush arch/x86/kernel/alternative.c:2407 [inline] text_poke_flush arch/x86/kernel/alternative.c:2404 [inline] text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2414 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205 static_key_enable+0x1a/0x20 kernel/jump_label.c:218 toggle_allocation_gate mm/kfence/core.c:830 [inline] toggle_allocation_gate+0xf4/0x250 mm/kfence/core.c:822 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630 process_scheduled_works kernel/workqueue.c:2703 [inline] worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784 kthread+0x2c6/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242