================================================================== BUG: KFENCE: use-after-free read in __list_add_valid+0x5f/0xb0 lib/list_debug.c:30 Use-after-free read at 0xffff88823bd2adc8 (in kfence-#148): __list_add_valid+0x5f/0xb0 lib/list_debug.c:30 __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] register_shrinker_prepared mm/vmscan.c:684 [inline] __register_shrinker mm/vmscan.c:696 [inline] register_shrinker+0x6f/0x160 mm/vmscan.c:722 nfsd4_init_leases_net+0x390/0x490 fs/nfsd/nfs4state.c:4393 nfsd_init_net+0x1b5/0x430 fs/nfsd/nfsctl.c:1456 ops_init+0xaf/0x470 net/core/net_namespace.c:134 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd kfence-#148: 0xffff88823bd2a800-0xffff88823bd2ae8f, size=1680, cache=kmalloc-2k allocated by task 17066 on cpu 1 at 3542.885641s: kmalloc include/linux/slab.h:605 [inline] kzalloc include/linux/slab.h:733 [inline] ops_init+0xfb/0x470 net/core/net_namespace.c:124 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd freed by task 17066 on cpu 0 at 3542.923742s: ops_init+0xcd/0x470 net/core/net_namespace.c:139 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd CPU: 1 PID: 17135 Comm: syz-executor.5 Not tainted 6.0.0-syzkaller-02744-g2e30960097f6 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 RIP: 0010:__list_add_valid+0x5f/0xb0 lib/list_debug.c:30 Code: 3c 02 00 75 50 49 8b 54 24 08 48 39 f2 0f 85 d8 d6 4b 05 48 b8 00 00 00 00 00 fc ff df 48 89 f2 48 c1 ea 03 80 3c 02 00 75 3a <48> 8b 16 4c 39 e2 0f 85 f9 d6 4b 05 48 39 f5 0f 84 d9 d6 4b 05 4c RSP: 0018:ffffc90004c5f808 EFLAGS: 00010246 RAX: dffffc0000000000 RBX: ffff88807bef75a8 RCX: ffffffff8985948e RDX: 1ffff110477a55b9 RSI: ffff88823bd2adc8 RDI: ffffffff8c083ac8 RBP: ffff88807bef75c8 R08: 0000000000000001 R09: ffffffff8c083a0f R10: fffffbfff1810741 R11: 0000000000000000 R12: ffffffff8c083ac0 R13: ffff88803e6d5000 R14: ffff88823bd2adc8 R15: ffff88807bef75c8 FS: 00007fc83aa04700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffff88823bd2adc8 CR3: 000000003edb9000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_add include/linux/list.h:69 [inline] list_add_tail include/linux/list.h:102 [inline] register_shrinker_prepared mm/vmscan.c:684 [inline] __register_shrinker mm/vmscan.c:696 [inline] register_shrinker+0x6f/0x160 mm/vmscan.c:722 nfsd4_init_leases_net+0x390/0x490 fs/nfsd/nfs4state.c:4393 nfsd_init_net+0x1b5/0x430 fs/nfsd/nfsctl.c:1456 ops_init+0xaf/0x470 net/core/net_namespace.c:134 setup_net+0x5d1/0xc50 net/core/net_namespace.c:325 copy_net_ns+0x318/0x760 net/core/net_namespace.c:471 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 copy_namespaces+0x391/0x450 kernel/nsproxy.c:178 copy_process+0x304d/0x7090 kernel/fork.c:2257 kernel_clone+0xe7/0xab0 kernel/fork.c:2671 __do_sys_clone+0xba/0x100 kernel/fork.c:2805 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc83988a5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc83aa04118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fc8399abf80 RCX: 00007fc83988a5a9 RDX: 0000000020000180 RSI: 00000000200000c0 RDI: 0000000041800000 RBP: 00007fc8398e5580 R08: 0000000020000200 R09: 0000000020000200 R10: 00000000200001c0 R11: 0000000000000206 R12: 0000000000000000 R13: 00007ffff888e3bf R14: 00007fc83aa04300 R15: 0000000000022000 ================================================================== ---------------- Code disassembly (best guess): 0: 3c 02 cmp $0x2,%al 2: 00 75 50 add %dh,0x50(%rbp) 5: 49 8b 54 24 08 mov 0x8(%r12),%rdx a: 48 39 f2 cmp %rsi,%rdx d: 0f 85 d8 d6 4b 05 jne 0x54bd6eb 13: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1a: fc ff df 1d: 48 89 f2 mov %rsi,%rdx 20: 48 c1 ea 03 shr $0x3,%rdx 24: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 28: 75 3a jne 0x64 * 2a: 48 8b 16 mov (%rsi),%rdx <-- trapping instruction 2d: 4c 39 e2 cmp %r12,%rdx 30: 0f 85 f9 d6 4b 05 jne 0x54bd72f 36: 48 39 f5 cmp %rsi,%rbp 39: 0f 84 d9 d6 4b 05 je 0x54bd718 3f: 4c rex.WR