watchdog: BUG: soft lockup - CPU#0 stuck for 143s! [syz.2.107:6206] Modules linked in: irq event stamp: 28912887 hardirqs last enabled at (28912886): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:310 hardirqs last disabled at (28912887): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1050 softirqs last enabled at (28843628): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (28843628): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (28843628): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (28843631): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (28843631): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (28843631): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6206 Comm: syz.2.107 Not tainted 6.15.0-syzkaller-gfa6932577c07 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 3b 8a fe 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000007478 EFLAGS: 00000206 RAX: 94993a83e27a2300 RBX: 0000000000000000 RCX: 94993a83e27a2300 RDX: 0000000000000000 RSI: ffffffff8db69e92 RDI: ffffffff8be28840 RBP: ffffffff81729de5 R08: 0000000000000000 R09: ffffffff81729de5 R10: dffffc0000000000 R11: ffffffff81acf670 R12: 0000000000000002 R13: ffffffff8e13f060 R14: 0000000000000000 R15: 0000000000000246 FS: 0000000000000000(0000) GS:ffff888125c54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9b23741000 CR3: 000000006d006000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 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:319 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:345 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4148 [inline] slab_alloc_node mm/slub.c:4197 [inline] kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4249 __alloc_skb+0x112/0x2d0 net/core/skbuff.c:660 alloc_skb include/linux/skbuff.h:1336 [inline] ndisc_alloc_skb+0x9f/0x480 net/ipv6/ndisc.c:423 ndisc_send_rs+0x2b5/0x630 net/ipv6/ndisc.c:707 addrconf_rs_timer+0x369/0x670 net/ipv6/addrconf.c:4041 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+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:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7108 Code: 24 20 f6 44 24 21 02 74 0c 90 0f 0b 48 f7 03 08 00 00 00 74 64 bf 01 00 00 00 e8 4b ab 29 f6 e8 26 c3 60 f6 fb bf 01 00 00 00 1b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc9001a20f520 EFLAGS: 00000282 RAX: 94993a83e27a2300 RBX: 0000000000000000 RCX: 94993a83e27a2300 RDX: 0000000000000000 RSI: ffffffff8d97d358 RDI: 0000000000000001 RBP: ffffc9001a20f5d0 R08: ffffffff8fa108f7 R09: 1ffffffff1f4211e R10: dffffc0000000000 R11: fffffbfff1f4211f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92003441ea4 irqentry_exit+0x6f/0x90 kernel/entry/common.c:307 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:filter_irq_stacks+0x6c/0xa0 kernel/stacktrace.c:396 Code: 30 02 00 81 0f 93 c1 48 3d 70 16 00 81 0f 92 c2 84 d1 75 27 48 3d 30 cd 68 8b 0f 92 c1 48 3d 4b cd 68 8b 0f 93 c0 08 c8 74 11 <48> ff c3 49 83 c7 08 49 39 dc 75 ae 44 89 e3 eb 06 ff c3 eb 02 31 RSP: 0018:ffffc9001a20f698 EFLAGS: 00000202 RAX: ffffffff82351b01 RBX: 0000000000000003 RCX: 0000000000000001 RDX: 0000000000002000 RSI: 000000000000000c RDI: ffffc9001a20f780 RBP: ffffc9001a20f878 R08: 0000000000000000 R09: ffffffff81cf4a16 R10: ffffc9001a20f658 R11: ffffffff81acf670 R12: 000000000000000c R13: dffffc0000000000 R14: ffffc9001a20f780 R15: ffffc9001a20f798 stack_depot_save_flags+0x40/0x900 lib/stackdepot.c:610 save_stack+0x103/0x1f0 mm/page_owner.c:157 __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:1248 [inline] __free_frozen_pages+0xc71/0xe70 mm/page_alloc.c:2706 vfree+0x25a/0x400 mm/vmalloc.c:3426 kcov_put kernel/kcov.c:439 [inline] kcov_close+0x28/0x50 kernel/kcov.c:535 __fput+0x449/0xa70 fs/file_table.c:465 task_work_run+0x1d1/0x260 kernel/task_work.c:227 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0x6ad/0x22e0 kernel/exit.c:955 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5f9298e929 Code: Unable to access opcode bytes at 0x7f5f9298e8ff. RSP: 002b:00007f5f937dc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000029 RAX: 0000000000000005 RBX: 00007f5f92bb5fa0 RCX: 00007f5f9298e929 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000000000002b RBP: 00007f5f92a10b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5f92bb5fa0 R15: 00007ffed3301e68 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 6564 Comm: syz.7.133 Not tainted 6.15.0-syzkaller-gfa6932577c07 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:hlock_class kernel/locking/lockdep.c:234 [inline] RIP: 0010:mark_lock+0x3c/0x190 kernel/locking/lockdep.c:4734 Code: 00 03 00 83 f9 01 bb 09 00 00 00 83 db 00 83 fa 08 0f 45 da bd 01 00 00 00 89 d9 d3 e5 25 ff 1f 00 00 48 0f a3 05 e4 1e 06 12 <73> 10 48 69 c0 c8 00 00 00 48 8d 88 30 83 45 93 eb 48 83 3d 2b ae RSP: 0018:ffffc90000a081a8 EFLAGS: 00000007 RAX: 000000000000003a RBX: 0000000000000002 RCX: 0000000000000002 RDX: 0000000000000002 RSI: ffff888020fa4740 RDI: ffff888020fa3c00 RBP: 0000000000000004 R08: ffffffff8fa108f7 R09: 1ffffffff1f4211e R10: dffffc0000000000 R11: fffffbfff1f4211f R12: ffff888020fa4740 R13: 0000000000000000 R14: ffff888020fa46f0 R15: 0000000000000002 FS: 0000000000000000(0000) GS:ffff888125d54000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88691f0ffc CR3: 000000007dba4000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_held_locks kernel/locking/lockdep.c:4328 [inline] __trace_hardirqs_on_caller kernel/locking/lockdep.c:4346 [inline] lockdep_hardirqs_on_prepare+0x129/0x2a0 kernel/locking/lockdep.c:4413 trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:78 irqentry_exit+0x74/0x90 kernel/entry/common.c:310 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:lock_acquire+0x175/0x360 kernel/locking/lockdep.c:5875 Code: 00 00 00 00 9c 8f 44 24 30 f7 44 24 30 00 02 00 00 0f 85 cd 00 00 00 f7 44 24 08 00 02 00 00 74 01 fb 65 48 8b 05 3b 8a fe 10 <48> 3b 44 24 58 0f 85 f2 00 00 00 48 83 c4 60 5b 41 5c 41 5d 41 5e RSP: 0018:ffffc90000a082d8 EFLAGS: 00000206 RAX: 30aa935750eb1400 RBX: 0000000000000000 RCX: 30aa935750eb1400 RDX: 0000000000000000 RSI: ffffffff8db69e92 RDI: ffffffff8be28840 RBP: ffffffff81729de5 R08: 0000000000000000 R09: ffffffff81729de5 R10: ffffc90000a08498 R11: ffffffff81acf670 R12: 0000000000000002 R13: ffffffff8e13f060 R14: 0000000000000000 R15: 0000000000000246 rcu_lock_acquire include/linux/rcupdate.h:331 [inline] rcu_read_lock include/linux/rcupdate.h:841 [inline] class_rcu_constructor include/linux/rcupdate.h:1155 [inline] unwind_next_frame+0xc2/0x2390 arch/x86/kernel/unwind_orc.c:479 arch_stack_walk+0x11c/0x150 arch/x86/kernel/stacktrace.c:25 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 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free_freelist_hook mm/slub.c:2410 [inline] slab_free_bulk mm/slub.c:4667 [inline] kmem_cache_free_bulk+0x2d1/0x520 mm/slub.c:5246 napi_skb_cache_put+0x47f/0x730 net/core/skbuff.c:1433 __free_old_xmit+0x2c7/0x650 drivers/net/virtio_net.c:-1 virtnet_free_old_xmit drivers/net/virtio_net.c:610 [inline] free_old_xmit drivers/net/virtio_net.c:1045 [inline] virtnet_poll_tx+0x42b/0x1560 drivers/net/virtio_net.c:3196 __napi_poll+0xc4/0x480 net/core/dev.c:7414 napi_poll net/core/dev.c:7478 [inline] net_rx_action+0x707/0xe30 net/core/dev.c:7605 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:debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] RIP: 0010:do_raw_spin_lock+0x88/0x290 kernel/locking/spinlock_debug.c:115 Code: f1 f1 04 f3 f3 f3 48 89 4c 24 18 4a 89 04 39 4c 8d 77 04 4c 89 f0 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 9f 01 00 00 41 8b 06 <3d> ad 4e ad de 0f 85 1b 01 00 00 4c 8d 63 10 4d 89 e6 49 c1 ee 03 RSP: 0018:ffffc900037df260 EFLAGS: 00000246 RAX: 00000000dead4ead RBX: ffff888024eb9c00 RCX: 1ffff920006fbe50 RDX: 0000000000000000 RSI: ffffffff8db69e92 RDI: ffff888024eb9c00 RBP: ffffc900037df318 R08: 0000000000000000 R09: ffffffff8211058e R10: ffffc900037df5a0 R11: fffff520006fbeb6 R12: 1ffff1100d1af583 R13: 0000000000bdb180 R14: ffff888024eb9c04 R15: dffffc0000000000 spin_lock include/linux/spinlock.h:351 [inline] __pte_offset_map_lock+0x13e/0x210 mm/pgtable-generic.c:402 pte_offset_map_lock include/linux/mm.h:3010 [inline] zap_pte_range mm/memory.c:1721 [inline] zap_pmd_range mm/memory.c:1827 [inline] zap_pud_range mm/memory.c:1856 [inline] zap_p4d_range mm/memory.c:1877 [inline] unmap_page_range+0xc06/0x41c0 mm/memory.c:1898 unmap_single_vma mm/memory.c:1941 [inline] unmap_vmas+0x399/0x580 mm/memory.c:1985 exit_mmap+0x248/0xb50 mm/mmap.c:1284 __mmput+0x118/0x420 kernel/fork.c:1121 exit_mm+0x1da/0x2c0 kernel/exit.c:581 do_exit+0x640/0x22e0 kernel/exit.c:943 do_group_exit+0x21c/0x2d0 kernel/exit.c:1104 get_signal+0x1286/0x1340 kernel/signal.c:3034 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:111 exit_to_user_mode_prepare include/linux/entry-common.h:330 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:414 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:449 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6f4978e929 Code: Unable to access opcode bytes at 0x7f6f4978e8ff. RSP: 002b:00007f6f4a5370e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000000 RBX: 00007f6f499b5fa8 RCX: 00007f6f4978e929 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f6f499b5fac RBP: 00007f6f499b5fa0 R08: 7fffffffffffffff R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 00007f6f499b5fac R13: 0000000000000000 R14: 00007ffe8551d330 R15: 00007ffe8551d418