vmalloc memory
list_add corruption. prev->next should be next (ffff88805359ec00), but was 0000000000000000. (prev=ffffc900038afa10).
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:32!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 1 UID: 0 PID: 22573 Comm: syz.1.2351 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
RIP: 0010:__list_add_valid_or_report+0xfb/0x130 lib/list_debug.c:32
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 3d 49 8b 55 00 4c 89 e9 48 89 de 48 c7 c7 c0 30 62 8c e8 f6 a4 ed fb 90 <0f> 0b 4c 89 e7 e8 5b be 4a fd e9 3a ff ff ff 4c 89 ef e8 4e be 4a
RSP: 0018:ffffc900038af938 EFLAGS: 00010282
RAX: 0000000000000075 RBX: ffff88805359ec00 RCX: 0000000000000000
RDX: 0000000000000075 RSI: ffffffff81ea1339 RDI: fffff52000715f18
RBP: ffffc900038afa10 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000001 R11: 0000000000000001 R12: ffff88805359ec08
R13: ffffc900038afa10 R14: ffff88805359ec08 R15: ffffc900038afa10
FS:  00007f5adbbd06c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32ef4ff8 CR3: 0000000055a2f000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __list_add_valid include/linux/list.h:104 [inline]
 __list_add include/linux/list.h:169 [inline]
 list_add_tail include/linux/list.h:206 [inline]
 rpc_queue_upcall+0x2ff/0x530 net/sunrpc/rpc_pipe.c:142
 __cld_pipe_upcall fs/nfsd/nfs4recover.c:668 [inline]
 cld_pipe_upcall fs/nfsd/nfs4recover.c:691 [inline]
 nfsd4_cld_grace_start fs/nfsd/nfs4recover.c:1305 [inline]
 nfsd4_cld_tracking_init+0x85a/0x10f0 fs/nfsd/nfs4recover.c:1494
 nfsd4_client_tracking_init+0xe5/0x1c0 fs/nfsd/nfs4recover.c:1941
 nfs4_state_start_net.cold+0xb7/0x480 fs/nfsd/nfs4state.c:9838
 nfsd_startup_net fs/nfsd/nfssvc.c:391 [inline]
 nfsd_svc+0x54a/0x7d0 fs/nfsd/nfssvc.c:775
 write_threads+0x316/0x600 fs/nfsd/nfsctl.c:438
 nfsctl_transaction_write+0x106/0x1a0 fs/nfsd/nfsctl.c:114
 vfs_write+0x2aa/0x1050 fs/read_write.c:685
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5adad9e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5adbbd0028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f5adb026090 RCX: 00007f5adad9e159
RDX: 0000000000000002 RSI: 0000200000000540 RDI: 0000000000000004
RBP: 00007f5adae3506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5adb026128 R14: 00007f5adb026090 R15: 00007ffcb4568148
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_add_valid_or_report+0xfb/0x130 lib/list_debug.c:32
Code: b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 75 3d 49 8b 55 00 4c 89 e9 48 89 de 48 c7 c7 c0 30 62 8c e8 f6 a4 ed fb 90 <0f> 0b 4c 89 e7 e8 5b be 4a fd e9 3a ff ff ff 4c 89 ef e8 4e be 4a
RSP: 0018:ffffc900038af938 EFLAGS: 00010282
RAX: 0000000000000075 RBX: ffff88805359ec00 RCX: 0000000000000000
RDX: 0000000000000075 RSI: ffffffff81ea1339 RDI: fffff52000715f18
RBP: ffffc900038afa10 R08: 0000000000000007 R09: 0000000000000000
R10: 8000000000000001 R11: 0000000000000001 R12: ffff88805359ec08
R13: ffffc900038afa10 R14: ffff88805359ec08 R15: ffffc900038afa10
FS:  00007f5adbbd06c0(0000) GS:ffff888123c59000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32ef4ff8 CR3: 0000000055a2f000 CR4: 00000000003526f0