Oops: general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027]
CPU: 1 UID: 0 PID: 20 Comm: rcuop/0 Not tainted syzkaller #0 a8cf528afde17777b8d0df17d514b1350887467d
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:dst_dev_put+0x2a/0x2a0 net/core/dst.c:146
Code: f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 1d 03 14 fd 49 89 dd 49 c1 ed 03 <43> 80 7c 25 00 00 74 08 48 89 df e8 86 2b 6a fd 4c 8b 33 48 8d 7b
RSP: 0018:ffffc900001479e8 EFLAGS: 00010202
RAX: ffffffff8471e123 RBX: 0000000000000020 RCX: ffff888103661300
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90000147a10 R08: ffff88810436852b R09: 1ffff1102086d0a5
R10: dffffc0000000000 R11: ffffed102086d0a6 R12: dffffc0000000000
R13: 0000000000000004 R14: 0000607e08e0a668 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e00a0 CR3: 000000010e330000 CR4: 00000000003526b0
Call Trace:
<TASK>
rt_fibinfo_free_cpus net/ipv4/fib_semantics.c:206 [inline]
fib_nh_common_release+0x18e/0x390 net/ipv4/fib_semantics.c:217
fib6_nh_release+0x5ab/0x5d0 net/ipv6/route.c:3709
fib6_info_destroy_rcu+0xc9/0x1c0 net/ipv6/ip6_fib.c:177
rcu_do_batch+0x5a3/0xd20 kernel/rcu/tree.c:2575
nocb_cb_wait kernel/rcu/tree_nocb.h:923 [inline]
rcu_nocb_cb_kthread+0x4dc/0xac0 kernel/rcu/tree_nocb.h:957
kthread+0x2c7/0x370 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:dst_dev_put+0x2a/0x2a0 net/core/dst.c:146
Code: f3 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 89 fb 49 bc 00 00 00 00 00 fc ff df e8 1d 03 14 fd 49 89 dd 49 c1 ed 03 <43> 80 7c 25 00 00 74 08 48 89 df e8 86 2b 6a fd 4c 8b 33 48 8d 7b
RSP: 0018:ffffc900001479e8 EFLAGS: 00010202
RAX: ffffffff8471e123 RBX: 0000000000000020 RCX: ffff888103661300
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000020
RBP: ffffc90000147a10 R08: ffff88810436852b R09: 1ffff1102086d0a5
R10: dffffc0000000000 R11: ffffed102086d0a6 R12: dffffc0000000000
R13: 0000000000000004 R14: 0000607e08e0a668 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c2e00a0 CR3: 000000010e330000 CR4: 00000000003526b0
----------------
Code disassembly (best guess):
0: f3 0f 1e fa endbr64
4: 55 push %rbp
5: 48 89 e5 mov %rsp,%rbp
8: 41 57 push %r15
a: 41 56 push %r14
c: 41 55 push %r13
e: 41 54 push %r12
10: 53 push %rbx
11: 48 89 fb mov %rdi,%rbx
14: 49 bc 00 00 00 00 00 movabs $0xdffffc0000000000,%r12
1b: fc ff df
1e: e8 1d 03 14 fd call 0xfd140340
23: 49 89 dd mov %rbx,%r13
26: 49 c1 ed 03 shr $0x3,%r13
* 2a: 43 80 7c 25 00 00 cmpb $0x0,0x0(%r13,%r12,1) <-- trapping instruction
30: 74 08 je 0x3a
32: 48 89 df mov %rbx,%rdi
35: e8 86 2b 6a fd call 0xfd6a2bc0
3a: 4c 8b 33 mov (%rbx),%r14
3d: 48 rex.W
3e: 8d .byte 0x8d
3f: 7b .byte 0x7b