watchdog: BUG: soft lockup - CPU#0 stuck for 142s! [syz.3.36:6019] Modules linked in: irq event stamp: 29294985 hardirqs last enabled at (29294984): [] irqentry_exit+0x74/0x90 kernel/entry/common.c:357 hardirqs last disabled at (29294985): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1049 softirqs last enabled at (13064430): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last enabled at (13064430): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last enabled at (13064430): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 softirqs last disabled at (13064433): [] __do_softirq kernel/softirq.c:613 [inline] softirqs last disabled at (13064433): [] invoke_softirq kernel/softirq.c:453 [inline] softirqs last disabled at (13064433): [] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 CPU: 0 UID: 0 PID: 6019 Comm: syz.3.36 Not tainted 6.15.0-rc4-syzkaller-gf263336a41da #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:rcu_read_unlock_special+0x87/0x4c0 kernel/rcu/tree_plugin.h:694 Code: f1 f1 f1 00 f2 f2 f2 4a 89 04 2b 66 42 c7 44 2b 09 f3 f3 42 c6 44 2b 0b f3 65 44 8b 35 e2 a3 cd 10 41 f7 c6 00 00 f0 00 74 49 <48> c7 44 24 40 0e 36 e0 45 4a c7 04 2b 00 00 00 00 66 42 c7 44 2b RSP: 0018:ffffc90000007100 EFLAGS: 00000206 RAX: 3c21e0c83ca9f200 RBX: 1ffff92000000e28 RCX: 3c21e0c83ca9f200 RDX: 0000000000000000 RSI: ffffffff8d749ffa RDI: ffffffff8bc1cde0 RBP: ffffc900000071f0 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: ffffffff8df40c00 R13: dffffc0000000000 R14: 0000000000000246 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8881260cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f95e879c421 CR3: 000000000dd36000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __rcu_read_unlock+0x84/0xe0 kernel/rcu/tree_plugin.h:438 rcu_read_unlock include/linux/rcupdate.h:873 [inline] is_bpf_text_address+0x292/0x2b0 kernel/bpf/core.c:774 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:319 [inline] __kasan_mempool_unpoison_object+0xa5/0x170 mm/kasan/common.c:547 kasan_mempool_unpoison_object include/linux/kasan.h:388 [inline] napi_skb_cache_get+0x37b/0x6d0 net/core/skbuff.c:293 __alloc_skb+0x11e/0x2d0 net/core/skbuff.c:656 napi_alloc_skb+0x84/0x7d0 net/core/skbuff.c:810 page_to_skb+0x233/0x8d0 drivers/net/virtio_net.c:840 receive_mergeable drivers/net/virtio_net.c:2430 [inline] receive_buf+0x302/0x1580 drivers/net/virtio_net.c:2568 virtnet_receive_packets drivers/net/virtio_net.c:2926 [inline] virtnet_receive drivers/net/virtio_net.c:2950 [inline] virtnet_poll+0x1f9b/0x2d70 drivers/net/virtio_net.c:3045 __napi_poll+0xc4/0x480 net/core/dev.c:7324 napi_poll net/core/dev.c:7388 [inline] net_rx_action+0x6ea/0xdf0 net/core/dev.c:7510 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_irq_work arch/x86/kernel/irq_work.c:17 [inline] sysvec_irq_work+0xa3/0xc0 arch/x86/kernel/irq_work.c:17 asm_sysvec_irq_work+0x1a/0x20 arch/x86/include/asm/idtentry.h:738 RIP: 0010:preempt_schedule_irq+0xb0/0x150 kernel/sched/core.c:7090 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 eb c3 39 f6 e8 86 43 70 f6 fb bf 01 00 00 00 4b ab ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24 RSP: 0018:ffffc900053bf560 EFLAGS: 00000286 RAX: 3c21e0c83ca9f200 RBX: 0000000000000000 RCX: 3c21e0c83ca9f200 RDX: 0000000000000000 RSI: ffffffff8d749ffa RDI: 0000000000000001 RBP: ffffc900053bf600 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: 0000000000000000 R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000a77eac irqentry_exit+0x6f/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:stack_trace_save+0xb0/0xe0 kernel/stacktrace.c:123 Code: 25 08 40 75 92 48 c7 c7 70 aa ac 81 48 89 c6 31 c9 e8 a4 ec bb ff 8b 44 24 30 48 c7 04 24 0e 36 e0 45 4a c7 04 33 00 00 00 00 <42> c7 44 33 08 00 00 00 00 65 48 8b 0d df 95 c8 10 48 3b 4c 24 78 RSP: 0018:ffffc900053bf6c0 EFLAGS: 00000296 RAX: 000000000000000c RBX: 1ffff92000a77ed8 RCX: 3c21e0c83ca9f200 RDX: 0000000000000000 RSI: ffffffff8d93515c RDI: ffff888032bf1e00 RBP: ffffc900053bf750 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff81ce80d6 R12: dffffc0000000000 R13: 1ffff92000a77ef0 R14: dffffc0000000000 R15: 1ffff1100657e472 save_stack+0xf7/0x1f0 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:1262 [inline] __free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725 vfree+0x1a6/0x330 mm/vmalloc.c:3383 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+0x8d6/0x2550 kernel/exit.c:953 do_group_exit+0x21c/0x2d0 kernel/exit.c:1102 get_signal+0x125e/0x1310 kernel/signal.c:3034 arch_do_signal_or_restart+0x95/0x780 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x8b/0x120 kernel/entry/common.c:218 do_syscall_64+0x103/0x210 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fca3918e969 Code: Unable to access opcode bytes at 0x7fca3918e93f. RSP: 002b:00007fca36ff6038 EFLAGS: 00000246 ORIG_RAX: 0000000000000035 RAX: ffffffffffffffa1 RBX: 00007fca393b5fa0 RCX: 00007fca3918e969 RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00007fca39210ab1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000440 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fca393b5fa0 R15: 00007ffe8792b8b8 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 101 PID: 5492 Comm: dhcpcd Not tainted 6.15.0-rc4-syzkaller-gf263336a41da #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 RIP: 0010:orc_ip arch/x86/kernel/unwind_orc.c:80 [inline] RIP: 0010:__orc_find arch/x86/kernel/unwind_orc.c:102 [inline] RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:227 [inline] RIP: 0010:unwind_next_frame+0x130e/0x2390 arch/x86/kernel/unwind_orc.c:494 Code: c1 e8 3f 48 01 c8 48 83 e0 fe 4c 8d 3c 45 00 00 00 00 49 01 ef 4c 89 f8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 0f b6 04 08 <84> c0 75 27 49 63 07 4c 01 f8 49 8d 4f 04 4c 39 e0 48 0f 46 e9 49 RSP: 0000:ffffc90000a07bf8 EFLAGS: 00000a02 RAX: 0000000000000000 RBX: ffffffff8ffb32a8 RCX: dffffc0000000000 RDX: ffffffff8ffb3288 RSI: ffffffff90aa6530 RDI: ffffffff8bc1cd80 RBP: ffffffff8ffb329c R08: 0000000000000009 R09: 0000000000000000 R10: 0000000000000000 R11: ffffffff817199f5 R12: ffffffff8ac825f6 R13: ffffffff8ffb3298 R14: ffffc90000a07cc8 R15: ffffffff8ffb32a0 FS: 00007f9664a3b740(0000) GS:ffff8881261cc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000561f4785f268 CR3: 0000000031d56000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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:2398 [inline] slab_free mm/slub.c:4656 [inline] kfree+0x193/0x440 mm/slub.c:4855 ieee80211_inform_bss+0xbd9/0x10a0 net/mac80211/scan.c:160 rdev_inform_bss net/wireless/rdev-ops.h:418 [inline] cfg80211_inform_single_bss_data+0xd02/0x1ac0 net/wireless/scan.c:2367 cfg80211_inform_bss_data+0x1f6/0x3ad0 net/wireless/scan.c:3222 cfg80211_inform_bss_frame_data+0x362/0x700 net/wireless/scan.c:3317 ieee80211_bss_info_update+0x746/0x9e0 net/mac80211/scan.c:226 ieee80211_scan_rx+0x527/0x9b0 net/mac80211/scan.c:340 __ieee80211_rx_handle_packet net/mac80211/rx.c:5179 [inline] ieee80211_rx_list+0x22fc/0x2d80 net/mac80211/rx.c:5416 ieee80211_rx_napi+0x1a8/0x3d0 net/mac80211/rx.c:5439 ieee80211_rx include/net/mac80211.h:5179 [inline] ieee80211_handle_queued_frames+0xe8/0x1f0 net/mac80211/main.c:441 tasklet_action_common+0x369/0x580 kernel/softirq.c:829 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:1049 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline] RIP: 0010:smp_call_function_many_cond+0xe6e/0x11c0 kernel/smp.c:885 Code: 89 ee 83 e6 01 31 ff e8 20 6d 0b 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 cb 68 0b 00 eb 37 f3 90 43 0f b6 04 2c <84> c0 75 10 41 f7 07 01 00 00 00 74 1e e8 b0 68 0b 00 eb e5 44 89 RSP: 0000:ffffc90003977720 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffff8880b893ad40 RCX: ffff8880263fbc00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90003977880 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e R10: dffffc0000000000 R11: fffffbfff1efda6f R12: 1ffff11017108245 R13: dffffc0000000000 R14: 0000000000000000 R15: ffff8880b8841228 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:1275 [inline] flush_tlb_mm_range+0x6ae/0x12b0 arch/x86/mm/tlb.c:1365 flush_tlb_page arch/x86/include/asm/tlbflush.h:324 [inline] ptep_clear_flush+0x120/0x170 mm/pgtable-generic.c:101 wp_page_copy mm/memory.c:3544 [inline] do_wp_page+0x1b5e/0x5760 mm/memory.c:3939 handle_pte_fault mm/memory.c:6013 [inline] __handle_mm_fault+0x1028/0x5380 mm/memory.c:6140 handle_mm_fault+0x3f6/0x8c0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f9664ab76df Code: 4c 2c 08 01 48 39 cd 74 7e 49 83 4c 24 08 04 eb 76 48 8b 55 70 49 8d 04 1c 48 8d 3d 55 d8 0e 00 4c 3b 72 18 0f 85 51 f8 ff ff <4c> 89 70 18 48 89 50 10 48 89 45 70 48 89 42 18 48 81 fb ff 03 00 RSP: 002b:00007fff982ca9f0 EFLAGS: 00010246 RAX: 0000561f4785f250 RBX: 00000000000005d0 RCX: 00007f9664be0aa0 RDX: 00007f9664be0b00 RSI: 0000000003f2c220 RDI: 00007f9664ba4f2a RBP: 00007f9664be0aa0 R08: 00007f9664be1140 R09: 0000000000000020 R10: 000000000000006b R11: 0000000000000000 R12: 0000561f4785ec80 R13: 0000000000001490 R14: 00007f9664be0b00 R15: 0000000000000ec0