general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 0 PID: 4904 Comm: syz-executor.5 Not tainted 5.9.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x350 fs/nfsd/nfscache.c:123 Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 d8 9b 2a ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 8b 02 00 00 RSP: 0018:ffffc90007ee7858 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88808f11b000 RCX: ffffc9000b517000 RDX: 0000000000000002 RSI: ffffffff8249af28 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: 0000000000000001 R09: ffffffff8c5f19ef R10: 0000000000000000 R11: 0000000000000001 R12: ffff888020000000 R13: 0000000000000000 R14: ffffed1004000001 R15: ffff888020000000 FS: 00007f754ea07700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c00c2cf050 CR3: 000000020f11f000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: nfsd_reply_cache_shutdown+0x142/0x2c0 fs/nfsd/nfscache.c:209 nfsd_exit_net+0x15f/0x490 fs/nfsd/nfsctl.c:1507 ops_exit_list+0xb0/0x160 net/core/net_namespace.c:186 setup_net+0x502/0x850 net/core/net_namespace.c:364 copy_net_ns+0x2cf/0x5e0 net/core/net_namespace.c:482 create_new_namespaces+0x3f6/0xb10 kernel/nsproxy.c:110 copy_namespaces+0x385/0x470 kernel/nsproxy.c:179 copy_process+0x294b/0x6920 kernel/fork.c:2072 _do_fork+0xe8/0xb10 kernel/fork.c:2428 __do_sys_clone3+0x1dd/0x320 kernel/fork.c:2703 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f754ea06c78 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 0000000000001f80 RCX: 000000000045d5b9 RDX: 0000000000000000 RSI: 0000000000000050 RDI: 0000000020000280 RBP: 000000000118cf78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffd988bcd5f R14: 00007f754ea079c0 R15: 000000000118cf4c Modules linked in: ---[ end trace eb54818d24801503 ]--- RIP: 0010:nfsd_reply_cache_free_locked+0x2d/0x350 fs/nfsd/nfscache.c:123 Code: 56 41 55 41 54 49 89 fc 55 48 89 f5 53 48 89 d3 e8 d8 9b 2a ff 48 8d 7d 61 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 8b 02 00 00 RSP: 0018:ffffc90007ee7858 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffff88808f11b000 RCX: ffffc9000b517000 RDX: 0000000000000002 RSI: ffffffff8249af28 RDI: 0000000000000011 RBP: ffffffffffffffb0 R08: 0000000000000001 R09: ffffffff8c5f19ef R10: 0000000000000000 R11: 0000000000000001 R12: ffff888020000000 R13: 0000000000000000 R14: ffffed1004000001 R15: ffff888020000000 FS: 00007f754ea07700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e60cf9000 CR3: 000000020f11f000 CR4: 00000000001526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600