watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.7.7790:4229] Modules linked in: irq event stamp: 11134467 hardirqs last enabled at (11134466): [] irqentry_exit+0x59e/0x620 kernel/entry/common.c:242 hardirqs last disabled at (11134467): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1056 softirqs last enabled at (9310210): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last enabled at (9310210): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last enabled at (9310210): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 softirqs last disabled at (9310213): [] __do_softirq kernel/softirq.c:656 [inline] softirqs last disabled at (9310213): [] invoke_softirq kernel/softirq.c:496 [inline] softirqs last disabled at (9310213): [] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 CPU: 0 UID: 0 PID: 4229 Comm: syz.7.7790 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:lock_acquire+0x20b/0x2e0 kernel/locking/lockdep.c:5872 Code: e9 30 ff ff ff e8 95 95 0b 0a f7 c3 00 02 00 00 0f 84 38 ff ff ff 65 48 8b 05 11 13 7a 11 48 3b 44 24 30 75 33 fb 48 83 c4 38 <5b> 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 8d 3d ce 53 73 RSP: 0018:ffffc90000007498 EFLAGS: 00000282 RAX: 79371f19f508bc00 RBX: 0000000000000246 RCX: 0000000000000303 RDX: 00000000def01082 RSI: ffffffff8e162a24 RDI: ffffffff8c27a800 RBP: 0000000000000000 R08: ffffffff81767a45 R09: ffffffff8e7602e0 R10: ffffc900000070c8 R11: fffff52000000e1b R12: 0000000000000002 R13: ffffffff8e7602e0 R14: 0000000000000000 R15: 0000000000000000 FS: 00007fd607e146c0(0000) GS:ffff888125467000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc6f52c4e9c CR3: 0000000028c5e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] rcu_read_lock include/linux/rcupdate.h:850 [inline] class_rcu_constructor include/linux/rcupdate.h:1193 [inline] unwind_next_frame+0xc2/0x23c0 arch/x86/kernel/unwind_orc.c:495 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2687 [inline] slab_free mm/slub.c:6124 [inline] kmem_cache_free+0x187/0x630 mm/slub.c:6254 kfree_skb_reason include/linux/skbuff.h:1322 [inline] kfree_skb include/linux/skbuff.h:1331 [inline] hsr_forward_skb+0x1a8b/0x2860 net/hsr/hsr_forward.c:753 send_hsr_supervision_frame+0x731/0xcb0 net/hsr/hsr_device.c:364 hsr_announce+0x1db/0x370 net/hsr/hsr_device.c:421 call_timer_fn+0x192/0x640 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers kernel/time/timer.c:2373 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2385 run_timer_base kernel/time/timer.c:2394 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2404 handle_softirqs+0x22a/0x870 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:memcg_rstat_updated+0xc6/0x220 mm/memcontrol.c:586 Code: 03 42 80 3c 38 00 74 08 48 89 df e8 74 c8 f7 ff 48 8b 1b 4a 8d 2c 2b 48 83 c5 10 49 89 ee 49 c1 ee 03 4d 89 fc 43 80 3c 3e 00 <74> 08 48 89 ef e8 50 c8 f7 ff 48 89 6c 24 10 4c 8b 7d 00 b8 a8 06 RSP: 0018:ffffc90003b07980 EFLAGS: 00000246 RAX: 1ffffffff1c354f2 RBX: ffff888125467000 RCX: 0000000000000002 RDX: ffffc9000e099000 RSI: ffffffff8c27a7e0 RDI: ffffffff8c27a7a0 RBP: ffffe8ffffc76410 R08: ffffffff82394187 R09: ffffffff8e7602e0 R10: ffffc90003b07608 R11: fffff52000760ec3 R12: dffffc0000000000 R13: 0000607eda80f400 R14: 1ffffd1ffff8ec82 R15: dffffc0000000000 mod_memcg_lruvec_state+0x15e/0x360 mm/memcontrol.c:763 account_slab_nmi_safe mm/memcontrol.c:2601 [inline] mod_objcg_mlstate+0xfc/0x1b0 mm/memcontrol.c:2613 drain_obj_stock+0x395/0x5f0 mm/memcontrol.c:3044 refill_obj_stock+0x241/0x9b0 mm/memcontrol.c:3098 obj_cgroup_charge_account+0x116/0x650 mm/memcontrol.c:3162 __memcg_slab_post_alloc_hook+0x5f8/0xa80 mm/memcontrol.c:3249 memcg_slab_post_alloc_hook mm/slub.c:2459 [inline] slab_post_alloc_hook mm/slub.c:4512 [inline] slab_alloc_node mm/slub.c:4830 [inline] kmem_cache_alloc_lru_noprof+0x346/0x640 mm/slub.c:4849 __d_alloc+0x37/0x6f0 fs/dcache.c:1740 d_alloc_pseudo+0x21/0xc0 fs/dcache.c:1871 alloc_path_pseudo fs/file_table.c:364 [inline] alloc_file_pseudo+0xdd/0x240 fs/file_table.c:380 sock_alloc_file+0xb8/0x2e0 net/socket.c:483 sock_map_fd net/socket.c:513 [inline] __sys_socket+0x13c/0x1b0 net/socket.c:1756 __do_sys_socket net/socket.c:1761 [inline] __se_sys_socket net/socket.c:1759 [inline] __x64_sys_socket+0x7a/0x90 net/socket.c:1759 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd606f9c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd607e14028 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 00007fd607215fa0 RCX: 00007fd606f9c799 RDX: 0000000000000300 RSI: 0200000000000002 RDI: 0000000000000011 RBP: 00007fd607032bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fd607216038 R14: 00007fd607215fa0 R15: 00007ffe5185fb78 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 2307 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:csd_lock_wait kernel/smp.c:342 [inline] RIP: 0010:smp_call_function_many_cond+0xce5/0x12c0 kernel/smp.c:877 Code: 45 8b 2c 24 44 89 ee 83 e6 01 31 ff e8 74 e2 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 1f de 0b 00 eb 38 f3 90 <42> 0f b6 04 2b 84 c0 75 11 41 f7 04 24 01 00 00 00 74 1e e8 03 de RSP: 0018:ffffc900041df440 EFLAGS: 00000293 RAX: ffffffff81b9ad7d RBX: 1ffff110170c8515 RCX: ffff888096c20000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc900041df580 R08: ffffffff90117db7 R09: 1ffffffff2022fb6 R10: dffffc0000000000 R11: fffffbfff2022fb7 R12: ffff8880b86428a8 R13: dffffc0000000000 R14: ffff8880b873bf80 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125567000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558c1f44e8 CR3: 000000000e54c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: on_each_cpu_cond_mask+0x3f/0x80 kernel/smp.c:1043 __flush_tlb_multi arch/x86/include/asm/paravirt.h:57 [inline] flush_tlb_multi arch/x86/mm/tlb.c:1382 [inline] flush_tlb_mm_range+0x5c3/0x10c0 arch/x86/mm/tlb.c:1472 tlb_flush arch/x86/include/asm/tlb.h:23 [inline] tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:505 [inline] tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:404 tlb_finish_mmu+0xf9/0x230 mm/mmu_gather.c:530 free_ldt_pgtables+0x19d/0x350 arch/x86/kernel/ldt.c:411 arch_exit_mmap arch/x86/include/asm/mmu_context.h:232 [inline] exit_mmap+0x1af/0xa10 mm/mmap.c:1287 __mmput+0x118/0x430 kernel/fork.c:1174 exit_mm+0x168/0x220 kernel/exit.c:581 do_exit+0x62e/0x2320 kernel/exit.c:959 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112 get_signal+0x1284/0x1330 kernel/signal.c:3034 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline] syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline] do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd606f57917 Code: Unable to access opcode bytes at 0x7fd606f578ed. RSP: 002b:00007ffe51860060 EFLAGS: 00000202 ORIG_RAX: 000000000000003d RAX: fffffffffffffe00 RBX: 000055558c1f4500 RCX: 00007fd606f57917 RDX: 0000000040000000 RSI: 00007ffe518600bc RDI: ffffffffffffffff RBP: 00007ffe518600bc R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008 R13: 0000000000000003 R14: 00007ffe51860318 R15: 0000000000000000