watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.1.218:7370] Modules linked in: irq event stamp: 11913925 hardirqs last enabled at (11913924): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (11913925): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (9048668): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (9048668): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (9048668): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (9048671): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (9048671): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (9048671): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 1 UID: 0 PID: 7370 Comm: syz.1.218 Not tainted 6.16.0-rc2-syzkaller-gd4adf1c9ee77 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:debug_lockdep_rcu_enabled+0x21/0x40 kernel/rcu/update.c:321 Code: 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d a7 bf 3a 04 00 74 1e 83 3d ca ef 3a 04 00 74 15 65 48 8b 0c 25 08 f0 9c 92 <31> c0 83 b9 ec 0a 00 00 00 0f 94 c0 c3 cc cc cc cc cc cc cc cc cc RSP: 0018:ffffc90000a07fd8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88802edd1e00 RDX: 0000000000000100 RSI: ffffffff8be28b60 RDI: ffffffff8be28b20 RBP: ffffc90000a080d8 R08: 0000000000000000 R09: ffffffff81cb8cc7 R10: 6f6c5f646165725f R11: 64656863735f6b63 R12: 0000000000000001 R13: 1ffff92000141008 R14: ffffffff81cb8cc7 R15: ffff8880684c9080 FS: 00007f008b0176c0(0000) GS:ffff888125d51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c39bc78 CR3: 00000000786de000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_call_bpf+0x720/0x850 kernel/trace/bpf_trace.c:124 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10866 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 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+0x3b2/0x3e0 kernel/locking/lockdep.c:5882 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock_sched include/linux/rcupdate.h:953 [inline] pfn_valid include/linux/mmzone.h:2168 [inline] __virt_addr_valid+0x475/0x5c0 arch/x86/mm/physaddr.c:65 kasan_addr_to_slab+0xf/0x90 mm/kasan/common.c:37 kasan_record_aux_stack+0xf/0xd0 mm/kasan/generic.c:533 __call_rcu_common kernel/rcu/tree.c:3090 [inline] call_rcu+0x142/0x990 kernel/rcu/tree.c:3210 refdst_drop include/net/dst.h:263 [inline] skb_dst_drop include/net/dst.h:275 [inline] __dev_queue_xmit+0x7f1/0x3a70 net/core/dev.c:4668 dev_queue_xmit include/linux/netdevice.h:3355 [inline] neigh_hh_output include/net/neighbour.h:523 [inline] neigh_output include/net/neighbour.h:537 [inline] ip6_finish_output2+0x11bc/0x16a0 net/ipv6/ip6_output.c:141 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline] ip6_finish_output+0x234/0x7d0 net/ipv6/ip6_output.c:226 NF_HOOK include/linux/netfilter.h:317 [inline] ndisc_send_skb+0xb47/0x1400 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747 expire_timers kernel/time/timer.c:1798 [inline] __run_timers kernel/time/timer.c:2372 [inline] __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384 run_timer_base kernel/time/timer.c:2393 [inline] run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:perf_trace_lock+0x6b/0x3b0 include/trace/events/lock.h:50 Code: 41 48 c7 44 24 48 89 93 90 8d 48 c7 44 24 50 70 86 9d 81 4c 8d 64 24 40 49 c1 ec 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4b 89 04 3c <43> c7 44 3c 08 04 f3 f3 f3 48 c7 44 24 60 00 00 00 00 c7 84 24 80 RSP: 0018:ffffc90004087200 EFLAGS: 00000a06 RAX: f2f2f200f1f1f1f1 RBX: ffffffff81cb8cc7 RCX: 0000000000080000 RDX: ffffffff81cb8cc7 RSI: ffffffff8e13eda0 RDI: ffffffff8e00df20 RBP: ffffc900040872e8 R08: ffffc900040873ef R09: 0000000000000000 R10: ffffc900040873e0 R11: ffffffffa020165c R12: 1ffff92000810e48 R13: ffffffff81cb8cc7 R14: ffffffff8e00df20 R15: dffffc0000000000 __do_trace_lock_release include/trace/events/lock.h:69 [inline] trace_lock_release include/trace/events/lock.h:69 [inline] lock_release+0x3b2/0x3e0 kernel/locking/lockdep.c:5882 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] trace_call_bpf+0x5a9/0x850 kernel/trace/bpf_trace.c:148 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:10866 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x2f8/0x3b0 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+0x3b2/0x3e0 kernel/locking/lockdep.c:5882 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] pte_unmap include/linux/pgtable.h:136 [inline] __text_poke+0x83e/0xa10 arch/x86/kernel/alternative.c:2566 text_poke arch/x86/kernel/alternative.c:2590 [inline] smp_text_poke_batch_finish+0x38c/0x1100 arch/x86/kernel/alternative.c:2898 __static_call_transform+0x4eb/0x750 arch/x86/kernel/static_call.c:111 arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1 __static_call_update+0x3c3/0x5d0 kernel/static_call_inline.c:209 tracepoint_update_call kernel/tracepoint.c:271 [inline] tracepoint_add_func+0x6f7/0xa10 kernel/tracepoint.c:319 tracepoint_probe_register_prio_may_exist+0x5f/0xa0 kernel/tracepoint.c:435 bpf_raw_tp_link_attach+0x4ff/0x6b0 kernel/bpf/syscall.c:4007 bpf_raw_tracepoint_open+0x19b/0x1f0 kernel/bpf/syscall.c:4038 __sys_bpf+0x3cd/0x860 kernel/bpf/syscall.c:5878 __do_sys_bpf kernel/bpf/syscall.c:5943 [inline] __se_sys_bpf kernel/bpf/syscall.c:5941 [inline] __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:5941 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f008a18e929 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:00007f008b017038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 00007f008a3b5fa0 RCX: 00007f008a18e929 RDX: 0000000000000010 RSI: 0000200000000600 RDI: 0000000000000011 RBP: 00007f008a210b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f008a3b5fa0 R15: 00007ffca31fc818 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 13 Comm: kworker/u8:1 Not tainted 6.16.0-rc2-syzkaller-gd4adf1c9ee77 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Workqueue: writeback wb_workfn (flush-8:0) RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x18/0x70 kernel/kcov.c:217 Code: cc cc 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 0c 25 08 f0 9c 92 65 8b 15 d8 93 dc 10 <81> e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 3c 16 00 00 RSP: 0018:ffffc90000126098 EFLAGS: 00000202 RAX: ffffffff81b4e850 RBX: ffff8880b863cb40 RCX: ffff88801d2b8000 RDX: 0000000000000003 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000126200 R08: ffffffff8fa10df7 R09: 1ffffffff1f421be R10: dffffc0000000000 R11: ffffffff81703110 R12: 1ffff110170e828d R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880b8741468 FS: 0000000000000000(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555587439350 CR3: 0000000034558000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: csd_lock_wait kernel/smp.c:340 [inline] smp_call_function_many_cond+0xf80/0x12d0 kernel/smp.c:885 on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1052 __flush_tlb_multi arch/x86/include/asm/paravirt.h:91 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline] flush_tlb_mm_range+0x6b1/0x12c0 arch/x86/mm/tlb.c:1451 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101 page_vma_mkclean_one+0x406/0x740 mm/rmap.c:1059 page_mkclean_one+0x1c0/0x280 mm/rmap.c:1100 __rmap_walk_file+0x467/0x620 mm/rmap.c:2897 rmap_walk mm/rmap.c:2941 [inline] folio_mkclean+0x297/0x390 mm/rmap.c:1132 folio_clear_dirty_for_io+0x1fa/0x8c0 mm/page-writeback.c:2964 mpage_submit_folio+0x84/0x3f0 fs/ext4/inode.c:2038 mpage_process_page_bufs+0x6d1/0xa00 fs/ext4/inode.c:2170 mpage_prepare_extent_to_map+0xe49/0x1760 fs/ext4/inode.c:2675 ext4_do_writepages+0xbf3/0x3f30 fs/ext4/inode.c:2816 ext4_writepages+0x205/0x350 fs/ext4/inode.c:2953 do_writepages+0x32b/0x550 mm/page-writeback.c:2636 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1680 writeback_sb_inodes+0x6b5/0x1000 fs/fs-writeback.c:1976 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2047 wb_writeback+0x44f/0xaf0 fs/fs-writeback.c:2158 wb_check_old_data_flush fs/fs-writeback.c:2262 [inline] wb_do_writeback fs/fs-writeback.c:2315 [inline] wb_workfn+0xaef/0xef0 fs/fs-writeback.c:2343 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245