refcount_t: increment on 0; use-after-free. Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 WARNING: CPU: 0 PID: 4467 at lib/refcount.c:153 refcount_inc+0x47/0x50 lib/refcount.c:153 Kernel panic - not syncing: panic_on_warn set ... should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc_trace+0x4b/0x740 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] __memcg_init_list_lru_node+0x169/0x270 mm/list_lru.c:312 memcg_init_list_lru_node mm/list_lru.c:333 [inline] memcg_init_list_lru mm/list_lru.c:397 [inline] __list_lru_init+0x544/0x750 mm/list_lru.c:553 alloc_super fs/super.c:237 [inline] sget_userns+0x6b1/0xe40 fs/super.c:502 mount_ns+0x6d/0x190 fs/super.c:1029 rpc_mount+0x9e/0xd0 net/sunrpc/rpc_pipe.c:1451 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x442d59 RSP: 002b:00007ffc5d8c33e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442d59 RDX: 0000000020000480 RSI: 0000000020000180 RDI: 0000000020000100 RBP: 00007ffc5d8c3c90 R08: 0000000000000000 R09: 0000000300000000 R10: 0000000000200000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000006 R14: 0000000000001380 R15: 00007ffc5d8c3528 CPU: 0 PID: 4467 Comm: syzkaller539107 Not tainted 4.16.0-rc6+ #42 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 panic+0x1e4/0x41c kernel/panic.c:183 __warn+0x1dc/0x200 kernel/panic.c:547 report_bug+0x1f4/0x2b0 lib/bug.c:186 fixup_bug.part.10+0x37/0x80 arch/x86/kernel/traps.c:178 fixup_bug arch/x86/kernel/traps.c:247 [inline] do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:986 RIP: 0010:refcount_inc+0x47/0x50 lib/refcount.c:153 RSP: 0018:ffff8801add77860 EFLAGS: 00010286 RAX: dffffc0000000008 RBX: ffff8801ada40044 RCX: ffffffff815b421e RDX: 0000000000000000 RSI: 1ffff10035baeebc RDI: 1ffff10035baee91 RBP: ffff8801add77868 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801add77af8 R13: ffff8801b2d0aa93 R14: ffff8801ada40040 R15: ffff8801b2d0ab01 get_net include/net/net_namespace.h:204 [inline] sk_alloc+0x3f9/0x1440 net/core/sock.c:1540 inet_create+0x47c/0xf50 net/ipv4/af_inet.c:320 __sock_create+0x4d4/0x850 net/socket.c:1285 sock_create net/socket.c:1325 [inline] SYSC_socket net/socket.c:1355 [inline] SyS_socket+0xeb/0x1d0 net/socket.c:1335 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x4457d7 RSP: 002b:00007ffc5d8c33e8 EFLAGS: 00000202 ORIG_RAX: 0000000000000029 RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00000000004457d7 RDX: 0000000000000006 RSI: 0000000000000001 RDI: 0000000000000002 RBP: 00007ffc5d8c3500 R08: 0000000000000000 R09: 0000000000000001 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000000003 R13: 0000000000000003 R14: 000000000000865d R15: 00007ffc5d8c3528 CPU: 1 PID: 4488 Comm: syzkaller539107 Not tainted 4.16.0-rc6+ #42 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc_trace+0x4b/0x740 mm/slab.c:3605 kmalloc include/linux/slab.h:512 [inline] __memcg_init_list_lru_node+0x169/0x270 mm/list_lru.c:312 memcg_init_list_lru_node mm/list_lru.c:333 [inline] memcg_init_list_lru mm/list_lru.c:397 [inline] __list_lru_init+0x544/0x750 mm/list_lru.c:553 alloc_super fs/super.c:237 [inline] sget_userns+0x6b1/0xe40 fs/super.c:502 mount_ns+0x6d/0x190 fs/super.c:1029 rpc_mount+0x9e/0xd0 net/sunrpc/rpc_pipe.c:1451 mount_fs+0x66/0x2d0 fs/super.c:1222 vfs_kern_mount.part.26+0xc6/0x4a0 fs/namespace.c:1037 vfs_kern_mount fs/namespace.c:2509 [inline] do_new_mount fs/namespace.c:2512 [inline] do_mount+0xea4/0x2bb0 fs/namespace.c:2842 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x442d59 RSP: 002b:00007ffc5d8c33e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000442d59 RDX: 0000000020000480 RSI: 0000000020000180 RDI: 0000000020000100 RBP: 00007ffc5d8c3c90 R08: 0000000000000000 R09: 0000000300000000 R10: 0000000000200000 R11: 0000000000000246 R12: ffffffffffffffff R13: 0000000000000006 R14: 0000000000001380 R15: 00007ffc5d8c3528 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..