====================================================== WARNING: possible circular locking dependency detected 4.15.0-rc8+ #7 Not tainted ------------------------------------------------------ syz-executor2/6248 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [<000000009ac878c9>] perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4557 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [<00000000b96825bc>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1249 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&cpuctx_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_init_cpu+0xb6/0x160 kernel/events/core.c:11076 perf_event_init+0x4e9/0x549 kernel/events/core.c:11123 start_kernel+0x4cc/0x819 init/main.c:627 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 -> #4 (pmus_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_init_cpu+0x2f/0x160 kernel/events/core.c:11070 cpuhp_invoke_callback+0x2ea/0x1d20 kernel/cpu.c:182 cpuhp_up_callbacks kernel/cpu.c:477 [inline] _cpu_up+0x216/0x510 kernel/cpu.c:1036 do_cpu_up+0x73/0xa0 kernel/cpu.c:1066 cpu_up+0x18/0x20 kernel/cpu.c:1074 smp_init+0x13a/0x152 kernel/smp.c:578 kernel_init_freeable+0x2fe/0x521 init/main.c:1067 kernel_init+0x13/0x180 init/main.c:999 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:541 -> #3 (cpu_hotplug_lock.rw_sem){++++}: percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] cpus_read_lock+0x42/0x90 kernel/cpu.c:293 static_key_slow_inc+0x9d/0x3c0 kernel/jump_label.c:123 tracepoint_add_func kernel/tracepoint.c:223 [inline] tracepoint_probe_register_prio+0x80d/0x9a0 kernel/tracepoint.c:283 tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:304 trace_event_reg+0x167/0x320 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x4ef/0xab0 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:7959 perf_try_init_event+0xc9/0x1f0 kernel/events/core.c:9192 perf_init_event kernel/events/core.c:9230 [inline] perf_event_alloc+0x1cc6/0x2b00 kernel/events/core.c:9494 SYSC_perf_event_open+0x84e/0x2e00 kernel/events/core.c:9949 SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9835 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #2 (tracepoints_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 tracepoint_probe_register_prio+0xa0/0x9a0 kernel/tracepoint.c:279 tracepoint_probe_register+0x2a/0x40 kernel/tracepoint.c:304 trace_event_reg+0x167/0x320 kernel/trace/trace_events.c:305 perf_trace_event_reg kernel/trace/trace_event_perf.c:122 [inline] perf_trace_event_init kernel/trace/trace_event_perf.c:197 [inline] perf_trace_init+0x4ef/0xab0 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x7d/0xf0 kernel/events/core.c:7959 perf_try_init_event+0xc9/0x1f0 kernel/events/core.c:9192 perf_init_event kernel/events/core.c:9230 [inline] perf_event_alloc+0x1cc6/0x2b00 kernel/events/core.c:9494 SYSC_perf_event_open+0x84e/0x2e00 kernel/events/core.c:9949 SyS_perf_event_open+0x39/0x50 kernel/events/core.c:9835 entry_SYSCALL_64_fastpath+0x29/0xa0 -> #1 (event_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_trace_destroy+0x28/0x100 kernel/trace/trace_event_perf.c:234 tp_perf_event_destroy+0x15/0x20 kernel/events/core.c:7943 _free_event+0x3bd/0x10f0 kernel/events/core.c:4104 free_event+0x84/0x150 kernel/events/core.c:4128 perf_event_release_kernel+0x54e/0xc10 kernel/events/core.c:4272 perf_release+0x37/0x50 kernel/events/core.c:4298 __fput+0x327/0x7e0 fs/file_table.c:210 ____fput+0x15/0x20 fs/file_table.c:244 task_work_run+0x199/0x270 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x9bb/0x1ad0 kernel/exit.c:865 do_group_exit+0x149/0x400 kernel/exit.c:968 get_signal+0x73f/0x16c0 kernel/signal.c:2335 do_signal+0x90/0x1eb0 arch/x86/kernel/signal.c:809 exit_to_usermode_loop+0x214/0x310 arch/x86/entry/common.c:158 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:264 [inline] do_syscall_64+0x6dc/0x920 arch/x86/entry/common.c:290 return_from_SYSCALL_64+0x0/0x75 -> #0 (&event->child_mutex){+.+.}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4557 _perf_ioctl kernel/events/core.c:4736 [inline] perf_ioctl+0x35a/0x1430 kernel/events/core.c:4748 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 other info that might help us debug this: Chain exists of: &event->child_mutex --> pmus_lock --> &cpuctx_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex); lock(pmus_lock); lock(&cpuctx_mutex); lock(&event->child_mutex); *** DEADLOCK *** 1 lock held by syz-executor2/6248: #0: (&cpuctx_mutex){+.+.}, at: [<00000000b96825bc>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1249 stack backtrace: CPU: 1 PID: 6248 Comm: syz-executor2 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 lib/dump_stack.c:53 print_circular_bug.isra.37+0x2cd/0x2dc kernel/locking/lockdep.c:1218 check_prev_add kernel/locking/lockdep.c:1858 [inline] check_prevs_add kernel/locking/lockdep.c:1971 [inline] validate_chain kernel/locking/lockdep.c:2412 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3426 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3914 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 perf_event_for_each_child+0x8a/0x150 kernel/events/core.c:4557 _perf_ioctl kernel/events/core.c:4736 [inline] perf_ioctl+0x35a/0x1430 kernel/events/core.c:4748 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f38650c2c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000452f19 RDX: 0000000000000000 RSI: 0000000000002403 RDI: 0000000000000012 RBP: 0000000000000431 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f5538 R13: 00000000ffffffff R14: 00007f38650c36d4 R15: 0000000000000000 EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs: 13 callbacks suppressed EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 7148 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3043 [inline] SyS_mount+0x3c/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f4ab4745c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4ab4745aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007f4ab4745a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f4ab4745bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7168 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3048 [inline] SyS_mount+0x6b/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f4ab4745c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4ab4745aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007f4ab4745a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f4ab4745bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7169 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3043 [inline] SyS_mount+0x3c/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7181 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] copy_mount_options+0x5f/0x2e0 fs/namespace.c:2721 SYSC_mount fs/namespace.c:3053 [inline] SyS_mount+0x87/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f4ab4745c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4ab4745aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007f4ab4745a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f4ab4745bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7176 Comm: syz-executor7 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3043 [inline] SyS_mount+0x3c/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f2011efac58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2011efaaa0 RCX: 0000000000452f19 RDX: 0000000020ab8000 RSI: 00000000206b2ff8 RDI: 0000000020f8f000 RBP: 00007f2011efaa90 R08: 0000000020364fff R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f2011efabc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7183 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3048 [inline] SyS_mount+0x6b/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 CPU: 0 PID: 7166 Comm: syz-executor4 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3043 [inline] SyS_mount+0x3c/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f1ae0b68c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1ae0b68aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007f1ae0b68a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f1ae0b68bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7201 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] copy_mount_options+0x5f/0x2e0 fs/namespace.c:2721 SYSC_mount fs/namespace.c:3053 [inline] SyS_mount+0x87/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7198 Comm: syz-executor7 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 memdup_user+0x2c/0x90 mm/util.c:164 strndup_user+0x62/0xb0 mm/util.c:195 copy_mount_string fs/namespace.c:2746 [inline] SYSC_mount fs/namespace.c:3048 [inline] SyS_mount+0x6b/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f2011efac58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2011efaaa0 RCX: 0000000000452f19 RDX: 0000000020ab8000 RSI: 00000000206b2ff8 RDI: 0000000020f8f000 RBP: 00007f2011efaa90 R08: 0000000020364fff R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f2011efabc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7210 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3542 getname_flags+0xcb/0x580 fs/namei.c:138 user_path_at_empty+0x2d/0x50 fs/namei.c:2590 user_path include/linux/namei.h:62 [inline] do_mount+0x15f/0x2bb0 fs/namespace.c:2782 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7214 Comm: syz-executor7 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] copy_mount_options+0x5f/0x2e0 fs/namespace.c:2721 SYSC_mount fs/namespace.c:3053 [inline] SyS_mount+0x87/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f2011efac58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2011efaaa0 RCX: 0000000000452f19 RDX: 0000000020ab8000 RSI: 00000000206b2ff8 RDI: 0000000020f8f000 RBP: 00007f2011efaa90 R08: 0000000020364fff R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f2011efabc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7224 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3542 kmem_cache_zalloc include/linux/slab.h:678 [inline] alloc_vfsmnt+0xe0/0x9c0 fs/namespace.c:205 vfs_kern_mount.part.26+0x84/0x4a0 fs/namespace.c:1030 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 CPU: 0 PID: 7195 Comm: syz-executor1 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3542 getname_flags+0xcb/0x580 fs/namei.c:138 user_path_at_empty+0x2d/0x50 fs/namei.c:2590 user_path include/linux/namei.h:62 [inline] do_mount+0x15f/0x2bb0 fs/namespace.c:2782 SYSC_mount fs/namespace.c:3058 [inline] SyS_mount+0xab/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f4ab4745c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f4ab4745aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007f4ab4745a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f4ab4745bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7233 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 lib/dump_stack.c:53 FAULT_INJECTION: forcing a failure. name fail_page_alloc, interval 1, probability 0, space 0, times 1 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3542 kmem_cache_zalloc include/linux/slab.h:678 [inline] alloc_vfsmnt+0xe0/0x9c0 fs/namespace.c:205 vfs_kern_mount.part.26+0x84/0x4a0 fs/namespace.c:1030 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 CPU: 0 PID: 7240 Comm: syz-executor7 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_fail_alloc_page mm/page_alloc.c:2948 [inline] prepare_alloc_pages mm/page_alloc.c:4187 [inline] __alloc_pages_nodemask+0x338/0xd80 mm/page_alloc.c:4226 __alloc_pages include/linux/gfp.h:456 [inline] __alloc_pages_node include/linux/gfp.h:469 [inline] kmem_getpages mm/slab.c:1413 [inline] cache_grow_begin+0x72/0x3f0 mm/slab.c:2668 cache_alloc_refill mm/slab.c:3035 [inline] ____cache_alloc mm/slab.c:3117 [inline] __do_cache_alloc mm/slab.c:3339 [inline] slab_alloc mm/slab.c:3374 [inline] kmem_cache_alloc_trace+0x3f0/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] copy_mount_options+0x5f/0x2e0 fs/namespace.c:2721 SYSC_mount fs/namespace.c:3053 [inline] SyS_mount+0x87/0x120 fs/namespace.c:3035 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007f2011efac58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2011efaaa0 RCX: 0000000000452f19 RDX: 0000000020ab8000 RSI: 00000000206b2ff8 RDI: 0000000020f8f000 RBP: 00007f2011efaa90 R08: 0000000020364fff R09: 0000000000000000 R10: 0000000000001000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007f2011efabc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7262 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 kstrdup+0x39/0x70 mm/util.c:56 kstrdup_const+0x39/0x50 mm/util.c:77 alloc_vfsmnt+0x1a5/0x9c0 fs/namespace.c:214 vfs_kern_mount.part.26+0x84/0x4a0 fs/namespace.c:1030 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 EXT4-fs: 26 callbacks suppressed EXT4-fs (sda1): re-mounted. Opts: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7282 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 kstrdup+0x39/0x70 mm/util.c:56 kstrdup_const+0x39/0x50 mm/util.c:77 alloc_vfsmnt+0x1a5/0x9c0 fs/namespace.c:214 vfs_kern_mount.part.26+0x84/0x4a0 fs/namespace.c:1030 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7292 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] kzalloc include/linux/slab.h:688 [inline] nfs_alloc_parsed_mount_data fs/nfs/super.c:917 [inline] nfs_fs_mount+0x196/0x2d50 fs/nfs/super.c:2673 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 7296 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] nfs_alloc_fhandle+0x3e/0x90 fs/nfs/inode.c:1444 nfs_fs_mount+0x544/0x2d50 fs/nfs/super.c:2674 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 7304 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] __do_kmalloc mm/slab.c:3706 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3723 kstrdup+0x39/0x70 mm/util.c:56 nfs23_validate_mount_data fs/nfs/super.c:2056 [inline] nfs_validate_mount_data fs/nfs/super.c:2140 [inline] nfs_fs_mount+0x1fea/0x2d50 fs/nfs/super.c:2679 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 EXT4-fs (sda1): re-mounted. Opts: FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: CPU: 0 PID: 7321 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #7 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+0x194/0x257 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:421 [inline] slab_alloc mm/slab.c:3368 [inline] kmem_cache_alloc_trace+0x4b/0x750 mm/slab.c:3608 kmalloc include/linux/slab.h:499 [inline] kzalloc include/linux/slab.h:688 [inline] nfs_alloc_server+0xe2/0x640 fs/nfs/client.c:877 nfs_create_server+0x37/0x550 fs/nfs/client.c:943 nfs_try_mount+0x147/0x9d0 fs/nfs/super.c:1884 nfs_fs_mount+0xe9b/0x2d50 fs/nfs/super.c:2693 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 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x452f19 RSP: 002b:00007fbd47426c58 EFLAGS: 00000212 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fbd47426aa0 RCX: 0000000000452f19 RDX: 000000002015d000 RSI: 0000000020c22000 RDI: 0000000020ff3000 RBP: 00007fbd47426a90 R08: 000000002000a000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004b7c96 R13: 00007fbd47426bc8 R14: 00000000004b7c96 R15: 0000000000000000 EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: EXT4-fs (sda1): re-mounted. Opts: