NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 1024) ====================================================== WARNING: possible circular locking dependency detected 4.14.291-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/9524 is trying to acquire lock: (&cpuctx_mutex/1){+.+.}, at: [] mutex_lock_double kernel/events/core.c:9868 [inline] (&cpuctx_mutex/1){+.+.}, at: [] __perf_event_ctx_lock_double kernel/events/core.c:10012 [inline] (&cpuctx_mutex/1){+.+.}, at: [] SYSC_perf_event_open kernel/events/core.c:10277 [inline] (&cpuctx_mutex/1){+.+.}, at: [] SyS_perf_event_open+0xd13/0x2530 kernel/events/core.c:10032 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [] mutex_lock_double kernel/events/core.c:9867 [inline] (&cpuctx_mutex){+.+.}, at: [] __perf_event_ctx_lock_double kernel/events/core.c:10012 [inline] (&cpuctx_mutex){+.+.}, at: [] SYSC_perf_event_open kernel/events/core.c:10277 [inline] (&cpuctx_mutex){+.+.}, at: [] SyS_perf_event_open+0xd06/0x2530 kernel/events/core.c:10032 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+0xc4/0x1310 kernel/locking/mutex.c:893 perf_event_init_cpu+0xb7/0x170 kernel/events/core.c:11286 perf_event_init+0x2cc/0x308 kernel/events/core.c:11333 start_kernel+0x45d/0x763 init/main.c:624 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #4 (pmus_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11280 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:186 cpuhp_up_callbacks kernel/cpu.c:574 [inline] _cpu_up+0x21e/0x520 kernel/cpu.c:1193 do_cpu_up+0x9a/0x160 kernel/cpu.c:1229 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x406/0x626 init/main.c:1074 kernel_init+0xd/0x167 init/main.c:1006 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #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+0x39/0xc0 kernel/cpu.c:297 static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123 tracepoint_add_func+0x747/0xa40 kernel/tracepoint.c:269 tracepoint_probe_register_prio kernel/tracepoint.c:331 [inline] tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:352 trace_event_reg+0x272/0x330 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+0x424/0xa30 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9374 perf_init_event kernel/events/core.c:9412 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9672 perf_event_alloc kernel/events/core.c:10042 [inline] SYSC_perf_event_open kernel/events/core.c:10146 [inline] SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10032 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (tracepoints_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 tracepoint_probe_register_prio kernel/tracepoint.c:327 [inline] tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:352 trace_event_reg+0x272/0x330 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+0x424/0xa30 kernel/trace/trace_event_perf.c:221 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9374 perf_init_event kernel/events/core.c:9412 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9672 perf_event_alloc kernel/events/core.c:10042 [inline] SYSC_perf_event_open kernel/events/core.c:10146 [inline] SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10032 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (event_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_trace_init+0x4f/0xa30 kernel/trace/trace_event_perf.c:216 perf_tp_event_init+0x79/0xf0 kernel/events/core.c:8140 perf_try_init_event+0xdf/0x1f0 kernel/events/core.c:9374 perf_init_event kernel/events/core.c:9412 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9672 perf_event_alloc kernel/events/core.c:10042 [inline] SYSC_perf_event_open kernel/events/core.c:10146 [inline] SyS_perf_event_open+0x683/0x2530 kernel/events/core.c:10032 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&cpuctx_mutex/1){+.+.}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 mutex_lock_double kernel/events/core.c:9868 [inline] __perf_event_ctx_lock_double kernel/events/core.c:10012 [inline] SYSC_perf_event_open kernel/events/core.c:10277 [inline] SyS_perf_event_open+0xd13/0x2530 kernel/events/core.c:10032 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: &cpuctx_mutex/1 --> pmus_lock --> &cpuctx_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex); lock(pmus_lock); lock(&cpuctx_mutex); lock(&cpuctx_mutex/1); *** DEADLOCK *** 1 lock held by syz-executor.0/9524: #0: (&cpuctx_mutex){+.+.}, at: [] mutex_lock_double kernel/events/core.c:9867 [inline] #0: (&cpuctx_mutex){+.+.}, at: [] __perf_event_ctx_lock_double kernel/events/core.c:10012 [inline] #0: (&cpuctx_mutex){+.+.}, at: [] SYSC_perf_event_open kernel/events/core.c:10277 [inline] #0: (&cpuctx_mutex){+.+.}, at: [] SyS_perf_event_open+0xd06/0x2530 kernel/events/core.c:10032 stack backtrace: CPU: 1 PID: 9524 Comm: syz-executor.0 Not tainted 4.14.291-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 mutex_lock_double kernel/events/core.c:9868 [inline] __perf_event_ctx_lock_double kernel/events/core.c:10012 [inline] SYSC_perf_event_open kernel/events/core.c:10277 [inline] SyS_perf_event_open+0xd13/0x2530 kernel/events/core.c:10032 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7efebdbe2279 RSP: 002b:00007efebc557168 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007efebdcf4f80 RCX: 00007efebdbe2279 RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 00000000200000c0 RBP: 00007efebdc3c2e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffec18247ff R14: 00007efebc557300 R15: 0000000000022000 overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready NILFS (loop2): broken superblock, retrying with spare superblock (blocksize = 2048) IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready NILFS (loop2): error -4 creating segctord thread overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready overlayfs: missing 'lowerdir' IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): vxcan0: link becomes ready IPVS: sync thread started: state = BACKUP, mcast_ifn = vlan0, syncid = 3, id = 0 IPv6: ADDRCONF(NETDEV_CHANGE): vxcan1: link becomes ready IPVS: sync thread started: state = BACKUP, mcast_ifn = vlan0, syncid = 3, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = vlan0, syncid = 3, id = 0 IPVS: sync thread started: state = BACKUP, mcast_ifn = vlan0, syncid = 3, id = 0