__dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xf7/0x13b lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.3+0x105/0x14b lib/fault-inject.c:149 should_failslab+0xba/0xf0 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] __do_kmalloc mm/slab.c:3718 [inline] __kmalloc+0x2eb/0x7b0 mm/slab.c:3729 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 7084 at lib/refcount.c:187 refcount_sub_and_test.cold.13+0x13/0x1c lib/refcount.c:187 Kernel panic - not syncing: panic_on_warn set ... kmalloc include/linux/slab.h:493 [inline] kzalloc include/linux/slab.h:661 [inline] register_shrinker+0xb5/0x1e0 mm/vmscan.c:284 sget_userns+0x8dc/0xb50 fs/super.c:535 mount_ns+0x5d/0x170 fs/super.c:1044 proc_mount+0x4b/0xa0 fs/proc/root.c:101 mount_fs+0x84/0x26e fs/super.c:1237 vfs_kern_mount.part.33+0x58/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:3329 [inline] kern_mount_data+0x42/0xa0 fs/namespace.c:3329 pid_ns_prepare_proc+0x1b/0x60 fs/proc/root.c:222 alloc_pid+0x930/0xcc0 kernel/pid.c:324 copy_process.part.37+0x2538/0x66e0 kernel/fork.c:1785 copy_process kernel/fork.c:1586 [inline] _do_fork+0x155/0xbb0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x14/0x20 kernel/fork.c:2174 do_syscall_64+0x1c9/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007ff2945f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007ff2945f4c90 RCX: 0000000000458c29 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000802122001ffa RBP: 000000000073bfa0 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ff2945f56d4 R13: 00000000004befd3 R14: 00000000004d0020 R15: 0000000000000003 CPU: 0 PID: 7084 Comm: syz-executor.5 Not tainted 4.14.174-syzkaller #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+0xf7/0x13b lib/dump_stack.c:58 panic+0x1b0/0x36a kernel/panic.c:183 __warn.cold.8+0x25/0x2a kernel/panic.c:547 report_bug+0x1a4/0x1f3 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:177 [inline] do_error_trap+0x1bd/0x310 arch/x86/kernel/traps.c:295 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314 invalid_op+0x1b/0x40 arch/x86/entry/entry_64.S:963 RIP: 0010:refcount_sub_and_test.cold.13+0x13/0x1c lib/refcount.c:187 RSP: 0018:ffff88807afd7af0 EFLAGS: 00010286 RAX: 0000000000000026 RBX: 0000000000000001 RCX: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 RDX: 0000000000000026 RSI: ffffffff868cb100 RDI: ffffed100f5faf55 RBP: ffff88807afd7b00 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809f1817c0 R13: dffffc0000000000 R14: ffff8880962129d8 R15: 0000802122001ffa refcount_dec_and_test+0x11/0x20 lib/refcount.c:212 kref_put include/linux/kref.h:69 [inline] put_pid_ns.part.2+0x4f/0x100 kernel/pid_namespace.c:203 put_pid_ns+0x9/0x10 kernel/pid_namespace.c:198 free_nsproxy+0xc9/0x190 kernel/nsproxy.c:182 switch_task_namespaces+0x84/0xa0 kernel/nsproxy.c:229 exit_task_namespaces+0xb/0x10 kernel/nsproxy.c:234 copy_process.part.37+0x38de/0x66e0 kernel/fork.c:1971 copy_process kernel/fork.c:1586 [inline] _do_fork+0x155/0xbb0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x14/0x20 kernel/fork.c:2174 do_syscall_64+0x1c9/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007f4c83d25c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007f4c83d25c90 RCX: 0000000000458c29 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000802122001ffa RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c83d266d4 R13: 00000000004befd3 R14: 00000000004d0020 R15: 0000000000000004 CPU: 1 PID: 7099 Comm: syz-executor.0 Not tainted 4.14.174-syzkaller #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+0xf7/0x13b lib/dump_stack.c:58 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold.3+0x105/0x14b lib/fault-inject.c:149 should_failslab+0xba/0xf0 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc+0x2d1/0x790 mm/slab.c:3550 proc_alloc_inode+0x19/0x1c0 fs/proc/inode.c:62 alloc_inode+0x59/0x150 fs/inode.c:209 new_inode_pseudo+0xc/0xd0 fs/inode.c:898 proc_get_inode+0x13/0x590 fs/proc/inode.c:435 proc_fill_super+0x1c9/0x298 fs/proc/inode.c:501 mount_ns+0xd2/0x170 fs/super.c:1051 proc_mount+0x4b/0xa0 fs/proc/root.c:101 mount_fs+0x84/0x26e fs/super.c:1237 vfs_kern_mount.part.33+0x58/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:3329 [inline] kern_mount_data+0x42/0xa0 fs/namespace.c:3329 pid_ns_prepare_proc+0x1b/0x60 fs/proc/root.c:222 alloc_pid+0x930/0xcc0 kernel/pid.c:324 copy_process.part.37+0x2538/0x66e0 kernel/fork.c:1785 copy_process kernel/fork.c:1586 [inline] _do_fork+0x155/0xbb0 kernel/fork.c:2070 SYSC_clone kernel/fork.c:2180 [inline] SyS_clone+0x14/0x20 kernel/fork.c:2174 do_syscall_64+0x1c9/0x5b0 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x458c29 RSP: 002b:00007fd8e0b05c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fd8e0b05c90 RCX: 0000000000458c29 RDX: 9999999999999999 RSI: 0000000000000000 RDI: 0000802122001ffa RBP: 000000000073bf00 R08: ffffffffffffffff R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd8e0b066d4 R13: 00000000004befd3 R14: 00000000004d0020 R15: 0000000000000004 Kernel Offset: disabled Rebooting in 86400 seconds..