watchdog: BUG: soft lockup - CPU#1 stuck for 123s! [syz.6.917:4074] Modules linked in: CPU: 1 PID: 4074 Comm: syz.6.917 Not tainted 5.4.290-syzkaller-00002-g41adfeb3d639 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 RIP: 0010:unwind_next_frame+0x4d0/0x1ea0 arch/x86/kernel/unwind_orc.c:451 Code: 00 00 c6 03 01 49 c7 c5 e0 b3 a6 84 49 8d 55 04 49 8d 5d 05 49 89 d4 49 c1 ec 03 49 bf 00 00 00 00 00 fc ff df 43 0f b6 04 3c <84> c0 0f 85 55 15 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 38 84 c0 RSP: 0018:ffff8881f6f094e0 EFLAGS: 00000a07 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff86b4c5dd RCX: ffffffff86771794 RDX: ffffffff86b4c5dc RSI: ffffffff86b4c5c6 RDI: 0000000000000001 RBP: ffff8881f6f097d0 R08: 0000000000000004 R09: ffff8881f6f09830 R10: 0000000000000000 R11: dffffc0000000001 R12: 1ffffffff0d698bb R13: ffffffff86b4c5d8 R14: 0000000000000003 R15: dffffc0000000000 FS: 00007fc8ea12e6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc8ebac413f CR3: 00000001ecce4000 CR4: 00000000003406a0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack mm/kasan/common.c:70 [inline] set_track mm/kasan/common.c:78 [inline] __kasan_kmalloc+0x171/0x210 mm/kasan/common.c:529 slab_post_alloc_hook mm/slab.h:584 [inline] slab_alloc_node mm/slub.c:2829 [inline] slab_alloc mm/slub.c:2837 [inline] kmem_cache_alloc+0xd9/0x250 mm/slub.c:2842 kmem_cache_alloc_node include/linux/slab.h:427 [inline] __alloc_skb+0x7a/0x4d0 net/core/skbuff.c:198 alloc_skb include/linux/skbuff.h:1080 [inline] nlmsg_new include/net/netlink.h:888 [inline] __neigh_notify+0x7c/0x130 net/core/neighbour.c:3371 neigh_update_notify net/core/neighbour.c:2533 [inline] neigh_timer_handler+0xa7d/0xf00 net/core/neighbour.c:1110 call_timer_fn+0x36/0x390 kernel/time/timer.c:1448 expire_timers kernel/time/timer.c:1493 [inline] __run_timers+0x879/0xbe0 kernel/time/timer.c:1817 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1830 __do_softirq+0x23b/0x6b7 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x195/0x1c0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:539 [inline] smp_apic_timer_interrupt+0x11a/0x490 arch/x86/kernel/apic/apic.c:1161 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:834 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:27 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:49 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:175 [inline] RIP: 0010:unwind_next_frame+0x60b/0x1ea0 arch/x86/kernel/unwind_orc.c:438 Code: c1 48 c1 f9 02 48 c1 e8 3f 48 01 c8 48 83 e0 fe 49 8d 5c 45 00 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 48 63 03 48 01 d8 48 8d 4b 04 4c 39 e0 4c 0f 46 e9 48 RSP: 0018:ffff8881c54cf1e0 EFLAGS: 00000a03 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffffff86575f2c RCX: dffffc0000000000 RDX: ffffffff86575ef4 RSI: ffffffff868530ee RDI: ffffffff812fbdbc RBP: ffff8881c54cf4d0 R08: 0000000000000010 R09: ffff8881c54cf530 R10: 0000000000000000 R11: dffffc0000000001 R12: ffffffff8198a97e R13: ffffffff86575f2c R14: ffffffff86575f28 R15: ffffffff86575f30 arch_stack_walk+0x111/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1c0 kernel/stacktrace.c:123 save_stack+0x95/0x880 mm/page_owner.c:122 __reset_page_owner+0x1f/0x100 mm/page_owner.c:149 reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1176 [inline] free_pcp_prepare mm/page_alloc.c:1233 [inline] free_unref_page_prepare+0x297/0x380 mm/page_alloc.c:3085 free_unref_page mm/page_alloc.c:3134 [inline] free_the_page mm/page_alloc.c:4953 [inline] __free_pages+0xaf/0x140 mm/page_alloc.c:4961 __vunmap+0x75b/0x890 mm/vmalloc.c:2260 kcov_put kernel/kcov.c:396 [inline] kcov_close+0x27/0x50 kernel/kcov.c:495 __fput+0x262/0x680 fs/file_table.c:281 task_work_run+0x140/0x170 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0xcaf/0x2bc0 kernel/exit.c:861 do_group_exit+0x138/0x300 kernel/exit.c:984 get_signal+0xdb1/0x1440 kernel/signal.c:2738 do_signal+0xb0/0x11f0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0xc0/0x1a0 arch/x86/entry/common.c:159 prepare_exit_to_usermode+0x199/0x200 arch/x86/entry/common.c:194 entry_SYSCALL_64_after_hwframe+0x5c/0xc1 RIP: 0033:0x7fc8ebac4169 Code: Bad RIP value. RSP: 002b:00007fc8ea12e038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: 0000000000010000 RBX: 00007fc8ebcdcfa0 RCX: 00007fc8ebac4169 RDX: 00000000fffffdef RSI: 00002000000001c0 RDI: 0000000000000000 RBP: 00007fc8ebb452a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fc8ebcdcfa0 R15: 00007fff3c328ee8 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at default_idle+0x1f/0x30 arch/x86/kernel/process.c:572