Extracting prog: 2m32.551963402s
Minimizing prog: 33.704µs
Simplifying prog options: 9m2.95478952s
Extracting C: 3m6.154036627s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
single: successfully extracted reproducer
found reproducer with 1 syscalls
minimizing guilty program
extracting C reproducer
testing compiled C program (duration=45.370731552s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
program did not crash
simplifying guilty program options
testing program (duration=45.370731552s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
extracting C reproducer
testing compiled C program (duration=45.370731552s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
program did not crash
testing program (duration=45.370731552s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
extracting C reproducer
testing compiled C program (duration=45.370731552s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
program did not crash
testing program (duration=45.370731552s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
validation run: crashed=true
testing program (duration=45.370731552s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
validation run: crashed=true
testing program (duration=45.370731552s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$kvm
detailed listing:
executing program 0:
openat$kvm(0xffffffffffffff9c, 0x0, 0x12000, 0x0)

program crashed: BUG: corrupted list in dst_destroy
validation run: crashed=true
reproducing took 23m33.980628547s
repro crashed as (corrupted=false):
list_del corruption, ffff88807dfcb090->next is NULL
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: netns cleanup_net
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807dfcb090 RCX: 46652657e6396e00
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100fbf9612
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557b73f74000 CR3: 0000000079b14000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 dst_destroy+0x202/0x5a0 net/core/dst.c:163
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x870 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 3d f7 e5 f5 f7 c3 00 02 00 00 74 05 e8 20 4e 11 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 54 a9 d7 f5 65 8b 05 6d 51 85 07 85 c0 74 18 5b 41 5e e9 91 48
RSP: 0018:ffffc90000b97568 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000286 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e019f95 RDI: 0000000000000001
RBP: ffffc90000b97688 R08: ffffffff9033edb7 R09: 1ffffffff2067db6
R10: dffffc0000000000 R11: fffffbfff2067db7 R12: ffff8880263f4690
R13: ffff8880263f4680 R14: ffff8880263f4630 R15: 1ffff11006a7da70
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 ref_tracker_dir_exit+0x4e6/0x660 lib/ref_tracker.c:245
 free_netdev+0x459/0x8e0 net/core/dev.c:12210
 netdev_run_todo+0xf8d/0x1130 net/core/dev.c:11738
 default_device_exit_batch+0x986/0xa00 net/core/dev.c:13087
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:704
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807dfcb090 RCX: 46652657e6396e00
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100fbf9612
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557b73f74000 CR3: 0000000079b14000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	f7 e8                	imul   %eax
   2:	3d f7 e5 f5 f7       	cmp    $0xf7f5e5f7,%eax
   7:	c3                   	ret
   8:	00 02                	add    %al,(%rdx)
   a:	00 00                	add    %al,(%rax)
   c:	74 05                	je     0x13
   e:	e8 20 4e 11 f6       	call   0xf6114e33
  13:	9c                   	pushf
  14:	58                   	pop    %rax
  15:	a9 00 02 00 00       	test   $0x200,%eax
  1a:	75 27                	jne    0x43
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 54 a9 d7 f5       	call   0xf5d7a983 <-- trapping instruction
  2f:	65 8b 05 6d 51 85 07 	mov    %gs:0x785516d(%rip),%eax        # 0x78551a3
  36:	85 c0                	test   %eax,%eax
  38:	74 18                	je     0x52
  3a:	5b                   	pop    %rbx
  3b:	41 5e                	pop    %r14
  3d:	e9                   	.byte 0xe9
  3e:	91                   	xchg   %eax,%ecx
  3f:	48                   	rex.W

final repro crashed as (corrupted=false):
list_del corruption, ffff88807dfcb090->next is NULL
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:53!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 1 UID: 0 PID: 49 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Workqueue: netns cleanup_net
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807dfcb090 RCX: 46652657e6396e00
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100fbf9612
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557b73f74000 CR3: 0000000079b14000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 __list_del_entry_valid include/linux/list.h:132 [inline]
 __list_del_entry include/linux/list.h:223 [inline]
 list_del_init include/linux/list.h:295 [inline]
 dst_destroy+0x202/0x5a0 net/core/dst.c:163
 rcu_do_batch kernel/rcu/tree.c:2617 [inline]
 rcu_core+0x7cd/0x1070 kernel/rcu/tree.c:2869
 handle_softirqs+0x22a/0x870 kernel/softirq.c:626
 __do_softirq kernel/softirq.c:660 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0x5f/0x150 kernel/softirq.c:727
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:743
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:179 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80 kernel/locking/spinlock.c:194
Code: f7 e8 3d f7 e5 f5 f7 c3 00 02 00 00 74 05 e8 20 4e 11 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 54 a9 d7 f5 65 8b 05 6d 51 85 07 85 c0 74 18 5b 41 5e e9 91 48
RSP: 0018:ffffc90000b97568 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000286 RCX: 0000000080000001
RDX: 0000000000000007 RSI: ffffffff8e019f95 RDI: 0000000000000001
RBP: ffffc90000b97688 R08: ffffffff9033edb7 R09: 1ffffffff2067db6
R10: dffffc0000000000 R11: fffffbfff2067db7 R12: ffff8880263f4690
R13: ffff8880263f4680 R14: ffff8880263f4630 R15: 1ffff11006a7da70
 spin_unlock_irqrestore include/linux/spinlock.h:407 [inline]
 ref_tracker_dir_exit+0x4e6/0x660 lib/ref_tracker.c:245
 free_netdev+0x459/0x8e0 net/core/dev.c:12210
 netdev_run_todo+0xf8d/0x1130 net/core/dev.c:11738
 default_device_exit_batch+0x986/0xa00 net/core/dev.c:13087
 ops_exit_list net/core/net_namespace.c:205 [inline]
 ops_undo_list+0x52b/0x940 net/core/net_namespace.c:252
 cleanup_net+0x56b/0x800 net/core/net_namespace.c:704
 process_one_work+0x949/0x1650 kernel/workqueue.c:3279
 process_scheduled_works kernel/workqueue.c:3362 [inline]
 worker_thread+0xb46/0x1140 kernel/workqueue.c:3443
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0xdf/0x190 lib/list_debug.c:52
Code: 49 39 1f 0f 85 9e 00 00 00 b0 01 5b 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc cc 48 c7 c7 a0 fc 29 8c 48 89 de e8 42 ee 63 fc 90 <0f> 0b 48 c7 c7 00 fd 29 8c 48 89 de e8 30 ee 63 fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807dfcb090 RCX: 46652657e6396e00
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100fbf9612
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888125102000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000557b73f74000 CR3: 0000000079b14000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	f7 e8                	imul   %eax
   2:	3d f7 e5 f5 f7       	cmp    $0xf7f5e5f7,%eax
   7:	c3                   	ret
   8:	00 02                	add    %al,(%rdx)
   a:	00 00                	add    %al,(%rax)
   c:	74 05                	je     0x13
   e:	e8 20 4e 11 f6       	call   0xf6114e33
  13:	9c                   	pushf
  14:	58                   	pop    %rax
  15:	a9 00 02 00 00       	test   $0x200,%eax
  1a:	75 27                	jne    0x43
  1c:	f7 c3 00 02 00 00    	test   $0x200,%ebx
  22:	74 01                	je     0x25
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 54 a9 d7 f5       	call   0xf5d7a983 <-- trapping instruction
  2f:	65 8b 05 6d 51 85 07 	mov    %gs:0x785516d(%rip),%eax        # 0x78551a3
  36:	85 c0                	test   %eax,%eax
  38:	74 18                	je     0x52
  3a:	5b                   	pop    %rbx
  3b:	41 5e                	pop    %r14
  3d:	e9                   	.byte 0xe9
  3e:	91                   	xchg   %eax,%ecx
  3f:	48                   	rex.W