list_del corruption, ffff88807b5eec90->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: 6358 Comm: syz.2.161 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
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 e9 52 5c f8 06 cc 48 c7 c7 a0 e8 27 8c 48 89 de e8 12 51 6e fc 90 <0f> 0b 48 c7 c7 00 e9 27 8c 48 89 de e8 00 51 6e fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807b5eec90 RCX: 2db21673c9450300
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100f6bdd92
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f658aeb3ff8 CR3: 0000000057238000 CR4: 00000000003526f0
Call Trace:
__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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_lockdep_current_cpu_online+0x25/0x120 kernel/rcu/tree.c:4037
Code: 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 65 8b 0d 80 90 71 11 b0 01 f7 c1 00 00 f0 00 0f 85 d5 00 00 00 83 3d ff e9 66 0e 00 <0f> 84 c8 00 00 00 65 ff 05 5e 90 71 11 e8 c9 fc 03 0a 89 c3 83 f8
RSP: 0018:ffffc900039072e8 EFLAGS: 00000202
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8c27e540 RDI: ffffffff8c27e500
RBP: 0000000000000001 R08: ffffffff823c1e54 R09: ffffffff8e760620
R10: dffffc0000000000 R11: fffff940000d7be1 R12: 000000000001af7c
R13: dffffc0000000000 R14: ffff88813fe27070 R15: 0000000000001000
rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
rcu_read_lock_held+0x1e/0x50 kernel/rcu/update.c:349
lookup_page_ext mm/page_ext.c:258 [inline]
page_ext_lookup+0xe7/0x180 mm/page_ext.c:513
page_ext_iter_begin include/linux/page_ext.h:133 [inline]
page_table_check_clear+0x238/0x5f0 mm/page_table_check.c:78
ptep_get_and_clear_full arch/x86/include/asm/jump_label.h:-1 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:846 [inline]
zap_present_folio_ptes mm/memory.c:1630 [inline]
zap_present_ptes mm/memory.c:1712 [inline]
do_zap_pte_range mm/memory.c:1814 [inline]
zap_pte_range mm/memory.c:1916 [inline]
zap_pmd_range mm/memory.c:2002 [inline]
zap_pud_range mm/memory.c:2030 [inline]
zap_p4d_range mm/memory.c:2051 [inline]
unmap_page_range+0x3394/0x48b0 mm/memory.c:2072
unmap_single_vma mm/memory.c:2114 [inline]
unmap_vmas+0x48f/0x6a0 mm/memory.c:2152
exit_mmap+0x280/0xa10 mm/mmap.c:1302
__mmput+0x118/0x430 kernel/fork.c:1175
exit_mm+0x168/0x220 kernel/exit.c:581
do_exit+0x6a2/0x23c0 kernel/exit.c:962
do_group_exit+0x21b/0x2d0 kernel/exit.c:1116
get_signal+0x1284/0x1330 kernel/signal.c:3032
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: 0033:0x7f4ed699c799
Code: Unable to access opcode bytes at 0x7f4ed699c76f.
RSP: 002b:00007f4ed77cb0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f4ed6c16098 RCX: 00007f4ed699c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f4ed6c16098
RBP: 00007f4ed6c16090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ed6c16128 R14: 00007ffd73af7d70 R15: 00007ffd73af7e58
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 e9 52 5c f8 06 cc 48 c7 c7 a0 e8 27 8c 48 89 de e8 12 51 6e fc 90 <0f> 0b 48 c7 c7 00 e9 27 8c 48 89 de e8 00 51 6e fc 90 0f 0b 4c 89
RSP: 0018:ffffc90000a08d58 EFLAGS: 00010046
RAX: 0000000000000033 RBX: ffff88807b5eec90 RCX: 2db21673c9450300
RDX: 0000000000000100 RSI: 0000000000000102 RDI: 0000000000000000
RBP: 0000000000000203 R08: ffffc90000a08ae7 R09: 1ffff9200014115c
R10: dffffc0000000000 R11: fffff5200014115d R12: 1ffff1100f6bdd92
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888125557000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f658aeb3ff8 CR3: 0000000057238000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
0: 90 nop
1: 90 nop
2: 90 nop
3: 90 nop
4: 90 nop
5: f3 0f 1e fa endbr64
9: 41 57 push %r15
b: 41 56 push %r14
d: 53 push %rbx
e: 65 8b 0d 80 90 71 11 mov %gs:0x11719080(%rip),%ecx # 0x11719095
15: b0 01 mov $0x1,%al
17: f7 c1 00 00 f0 00 test $0xf00000,%ecx
1d: 0f 85 d5 00 00 00 jne 0xf8
23: 83 3d ff e9 66 0e 00 cmpl $0x0,0xe66e9ff(%rip) # 0xe66ea29
* 2a: 0f 84 c8 00 00 00 je 0xf8 <-- trapping instruction
30: 65 ff 05 5e 90 71 11 incl %gs:0x1171905e(%rip) # 0x11719095
37: e8 c9 fc 03 0a call 0xa03fd05
3c: 89 c3 mov %eax,%ebx
3e: 83 .byte 0x83
3f: f8 clc