watchdog: BUG: soft lockup - CPU#0 stuck for 144s! [syz.4.398:8186] Modules linked in: irq event stamp: 6328163 hardirqs last enabled at (6328162): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:200 hardirqs last disabled at (6328163): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (11136): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (11136): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (11136): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (11577): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (11577): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (11577): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 8186 Comm: syz.4.398 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 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+0x28/0x90 kernel/kcov.c:314 Code: 90 90 f3 0f 1e fa 48 8b 04 24 65 48 8b 14 25 08 40 a0 92 65 8b 0d 88 8f e0 10 81 e1 00 01 ff 00 74 11 81 f9 00 01 00 00 75 5b <83> ba 3c 16 00 00 00 74 52 8b 8a 18 16 00 00 83 f9 03 75 47 48 8b RSP: 0018:ffffc90000006a98 EFLAGS: 00000246 RAX: ffffffff81c93a1b RBX: 000000000000002c RCX: 0000000000000100 RDX: ffff88807ccd9e00 RSI: 00000000ffffffff RDI: 0000000000000000 RBP: 00000000ffffffff R08: ffffc90000006d57 R09: 0000000000000000 R10: ffffc90000006d40 R11: fffff52000000dab R12: 1ffff92000000d64 R13: dffffc0000000000 R14: ffffc90000006b40 R15: ffffc90000006b60 FS: 00007f6d9ff966c0(0000) GS:ffff888125c1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8f079d5d58 CR3: 0000000066ed2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_buf_alloc+0x7b/0x2a0 kernel/trace/trace_event_perf.c:411 do_perf_trace_lock include/trace/events/lock.h:50 [inline] perf_trace_lock+0x18d/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:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock+0x93/0xa0 include/linux/rcupdate.h:871 __perf_output_begin kernel/events/ring_buffer.c:268 [inline] perf_output_begin_forward+0x9bc/0xa80 kernel/events/ring_buffer.c:277 __perf_event_output kernel/events/core.c:8479 [inline] perf_event_output_forward+0x2b2/0x430 kernel/events/core.c:8497 __perf_event_overflow+0x7cc/0xe10 kernel/events/core.c:10372 perf_swevent_overflow kernel/events/core.c:10447 [inline] perf_swevent_event+0x2f4/0x5e0 kernel/events/core.c:-1 perf_tp_event+0x4f6/0x1380 kernel/events/core.c:10992 perf_trace_run_bpf_submit+0xee/0x170 kernel/events/core.c:10916 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:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] is_bpf_text_address+0x28d/0x2b0 kernel/bpf/core.c:746 kernel_text_address+0xa5/0xe0 kernel/extable.c:125 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4281 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:659 alloc_skb include/linux/skbuff.h:1336 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:420 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:706 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17b/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+0x283/0x870 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:do_perf_trace_lock include/trace/events/lock.h:50 [inline] RIP: 0010:perf_trace_lock+0x263/0x3b0 include/trace/events/lock.h:50 Code: 4c 89 e7 e8 bf 77 86 00 41 81 c5 18 00 01 00 48 89 da 49 c7 04 24 00 00 00 00 48 8d 7b 08 48 89 f8 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 08 01 00 00 48 89 54 24 18 44 89 6a 08 48 8d 7b 18 41 RSP: 0018:ffffc900059177a0 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffffe8ffffcbcec8 RCX: dffffc0000000000 RDX: ffffe8ffffcbcec8 RSI: 0000000000000000 RDI: ffffe8ffffcbced0 RBP: ffffc90005917888 R08: 0000000000000004 R09: 0000000000000004 R10: ffffe8ffffcbceec R11: fffff91ffff979df R12: ffff8880b8632a10 R13: 00000000000e0018 R14: 000000000000002c 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:5879 rcu_lock_release include/linux/rcupdate.h:341 [inline] rcu_read_unlock include/linux/rcupdate.h:871 [inline] class_rcu_destructor include/linux/rcupdate.h:1169 [inline] is_module_text_address+0x18b/0x1e0 kernel/module/main.c:3847 kernel_text_address+0x94/0xe0 kernel/extable.c:119 __kernel_text_address+0xd/0x40 kernel/extable.c:79 unwind_get_return_address+0x4d/0x90 arch/x86/kernel/unwind_orc.c:369 arch_stack_walk+0xfc/0x150 arch/x86/kernel/stacktrace.c:26 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 unpoison_slab_object mm/kasan/common.c:330 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:356 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 getname_flags+0xb8/0x540 fs/namei.c:146 getname include/linux/fs.h:2918 [inline] do_sys_openat2+0xbc/0x1c0 fs/open.c:1429 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 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: 0033:0x7f6d9f18ebe9 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:00007f6d9ff96038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6d9f3c6090 RCX: 00007f6d9f18ebe9 RDX: 00000000000026e1 RSI: 0000200000000140 RDI: ffffffffffffff9c RBP: 00007f6d9f211e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f6d9f3c6128 R14: 00007f6d9f3c6090 R15: 00007fff3f806ba8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 8176 Comm: syz.3.397 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x83/0x90 kernel/kcov.c:316 Code: 8d 52 28 4d 39 ca 77 22 89 ff 89 f6 49 ff c0 4c 89 01 48 c7 44 11 08 05 00 00 00 48 89 7c 11 10 48 89 74 11 18 48 89 44 11 20 c8 7a bc 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000a08568 EFLAGS: 00000006 RAX: ffffffff81b1728f RBX: 0000004d9b8531d8 RCX: 0000000000010100 RDX: ffff888027b98000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffff8880b8727a83 R09: 1ffff110170e4f50 R10: dffffc0000000000 R11: ffffed10170e4f51 R12: 7fffffffffffffff R13: dffffc0000000000 R14: ffff8880b8723900 R15: 0000000000000003 FS: 00007f3c0c9b66c0(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000555568b565c8 CR3: 000000003251e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: tick_program_event+0x8f/0x120 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x620/0xaa0 kernel/time/hrtimer.c:1900 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1039 [inline] __sysvec_apic_timer_interrupt+0x108/0x410 arch/x86/kernel/apic/apic.c:1056 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0x52/0xc0 arch/x86/kernel/apic/apic.c:1050 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:__memcg_slab_post_alloc_hook+0x0/0x7f0 mm/memcontrol.c:3132 Code: b1 a3 8f e8 b2 ea f7 ff e9 aa fd ff ff 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <66> 0f 1f 00 55 41 57 41 56 41 55 41 54 53 48 81 ec 88 00 00 00 4c RSP: 0018:ffffc90000a087c8 EFLAGS: 00000246 RAX: ffff88804bda9780 RBX: ffff88804bda9780 RCX: 0000000000000001 RDX: 0000000000000820 RSI: 0000000000000000 RDI: ffff88802e9d2640 RBP: 0000000000000820 R08: ffffc90000a087e0 R09: 0000000000000000 R10: ffff88804bda9780 R11: ffffffff81ac3930 R12: 00000000000000e8 R13: ffff88804bda9780 R14: ffff88802e9d2640 R15: 000000000000d700 memcg_slab_post_alloc_hook mm/slub.c:2216 [inline] slab_post_alloc_hook mm/slub.c:4190 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x2bf/0x3c0 mm/slub.c:4236 dst_alloc+0x105/0x170 net/core/dst.c:89 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x420 net/ipv6/route.c:3324 ndisc_send_skb+0x41f/0x1440 net/ipv6/ndisc.c:491 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4037 call_timer_fn+0x17b/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+0x283/0x870 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:__schedule+0x0/0x4cc0 kernel/sched/core.c:6817 Code: a9 f6 45 89 f8 89 d9 48 8b 5c 24 08 e9 ee fe ff ff 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 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48 RSP: 0018:ffffc900058d70f8 EFLAGS: 00000286 RAX: 5b285d68b8deff00 RBX: 0000000000000000 RCX: 5b285d68b8deff00 RDX: 0000000000000007 RSI: ffffffff8d9b6a7d RDI: 0000000000000001 RBP: ffffc900058d71b0 R08: ffffffff8fa38037 R09: 1ffffffff1f47006 R10: dffffc0000000000 R11: fffffbfff1f47007 R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000b1ae20 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7288 irqentry_exit+0x6f/0x90 kernel/entry/common.c:197 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:stack_trace_consume_entry+0xa2/0x280 kernel/stacktrace.c:93 Code: cc 41 0f b6 04 17 84 c0 0f 85 78 01 00 00 44 89 23 b0 01 e9 99 00 00 00 31 c0 e9 92 00 00 00 48 89 f8 48 c1 e8 03 80 3c 10 00 <74> 29 49 89 ff 48 89 74 24 08 49 89 d4 4c 89 04 24 4c 89 cb e8 a5 RSP: 0018:ffffc900058d7278 EFLAGS: 00000246 RAX: 1ffff92000b1ae70 RBX: ffffc900058d738c RCX: 5b285d68b8deff00 RDX: dffffc0000000000 RSI: ffffffff823b2a42 RDI: ffffc900058d7380 RBP: 1ffff92000b1ae72 R08: ffffc900058d7390 R09: 000000000000000a R10: ffffc900058d7318 R11: ffffffff81ac3930 R12: 0000000000000000 R13: 1ffff92000b1ae71 R14: ffffc900058d7388 R15: 1ffff92000b1ae71 arch_stack_walk+0x10d/0x150 arch/x86/kernel/stacktrace.c:27 stack_trace_save+0x9c/0xe0 kernel/stacktrace.c:122 save_stack+0xf5/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x71/0x1f0 mm/page_owner.c:308 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2895 discard_slab mm/slub.c:2753 [inline] __put_partials+0x156/0x1a0 mm/slub.c:3218 put_cpu_partial+0x17c/0x250 mm/slub.c:3293 __slab_free+0x2d5/0x3c0 mm/slub.c:4550 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:340 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4180 [inline] slab_alloc_node mm/slub.c:4229 [inline] kmem_cache_alloc_noprof+0x1c1/0x3c0 mm/slub.c:4236 lsm_inode_alloc security/security.c:755 [inline] security_inode_alloc+0x39/0x330 security/security.c:1697 inode_init_always_gfp+0x9ed/0xdc0 fs/inode.c:306 inode_init_always include/linux/fs.h:3308 [inline] alloc_inode+0x82/0x1b0 fs/inode.c:353 new_inode+0x22/0x170 fs/inode.c:1145 proc_pid_make_inode+0x21/0x130 fs/proc/base.c:1953 proc_ns_instantiate fs/proc/namespaces.c:105 [inline] proc_ns_dir_lookup+0x697/0x7c0 fs/proc/namespaces.c:171 lookup_open fs/namei.c:3686 [inline] open_last_lookups fs/namei.c:3807 [inline] path_openat+0x10fe/0x3830 fs/namei.c:4043 do_filp_open+0x1fa/0x410 fs/namei.c:4073 do_sys_openat2+0x121/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1450 [inline] __do_sys_openat fs/open.c:1466 [inline] __se_sys_openat fs/open.c:1461 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1461 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: 0033:0x7f3c0bb8d550 Code: 48 89 44 24 20 75 93 44 89 54 24 0c e8 49 94 02 00 44 8b 54 24 0c 89 da 48 89 ee 41 89 c0 bf 9c ff ff ff b8 01 01 00 00 0f 05 <48> 3d 00 f0 ff ff 77 38 44 89 c7 89 44 24 0c e8 9c 94 02 00 8b 44 RSP: 002b:00007f3c0c9b5f10 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f3c0bb8d550 RDX: 0000000000000002 RSI: 00007f3c0c9b5fa0 RDI: 00000000ffffff9c RBP: 00007f3c0c9b5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007f3c0bdc6038 R14: 00007f3c0bdc5fa0 R15: 00007ffc8b1cac88