hfs: can't find a HFS filesystem on dev loop3 ====================================================== WARNING: possible circular locking dependency detected 4.14.215-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/27848 is trying to acquire lock: (event_mutex){+.+.}, at: [] ftrace_profile_set_filter+0x64/0x1be kernel/trace/trace_events_filter.c:2268 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&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:11250 perf_event_init+0x2cc/0x308 kernel/events/core.c:11297 start_kernel+0x46a/0x770 init/main.c:620 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #3 (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:11244 cpuhp_invoke_callback+0x1e6/0x1a80 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:572 [inline] _cpu_up+0x219/0x500 kernel/cpu.c:1144 do_cpu_up+0x9a/0x160 kernel/cpu.c:1179 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x3f4/0x614 init/main.c:1068 kernel_init+0xd/0x165 init/main.c:1000 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #2 (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:295 static_key_slow_inc+0xe/0x20 kernel/jump_label.c:123 tracepoint_add_func+0x517/0x750 kernel/tracepoint.c:223 tracepoint_probe_register_prio kernel/tracepoint.c:283 [inline] tracepoint_probe_register+0x8c/0xc0 kernel/tracepoint.c:304 register_trace_block_rq_insert include/trace/events/block.h:192 [inline] blk_register_tracepoints+0x1a/0x2f0 kernel/trace/blktrace.c:1175 get_probe_ref kernel/trace/blktrace.c:340 [inline] do_blk_trace_setup+0x8a1/0xac0 kernel/trace/blktrace.c:602 __blk_trace_setup+0xa3/0x120 kernel/trace/blktrace.c:621 blk_trace_ioctl+0x136/0x250 kernel/trace/blktrace.c:762 blkdev_ioctl+0xec/0x1830 block/ioctl.c:580 block_ioctl+0xd9/0x120 fs/block_dev.c:1893 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (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:279 [inline] tracepoint_probe_register+0x68/0xc0 kernel/tracepoint.c:304 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:8138 perf_try_init_event+0x15b/0x1f0 kernel/events/core.c:9369 perf_init_event kernel/events/core.c:9407 [inline] perf_event_alloc.part.0+0xe2d/0x2640 kernel/events/core.c:9667 perf_event_alloc kernel/events/core.c:10020 [inline] SYSC_perf_event_open kernel/events/core.c:10124 [inline] SyS_perf_event_open+0x67f/0x24b0 kernel/events/core.c:10010 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (event_mutex){+.+.}: 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 ftrace_profile_set_filter+0x64/0x1be kernel/trace/trace_events_filter.c:2268 perf_event_set_filter kernel/events/core.c:8719 [inline] _perf_ioctl+0x13b2/0x1a40 kernel/events/core.c:4850 perf_ioctl+0x55/0x80 kernel/events/core.c:4887 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 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: event_mutex --> pmus_lock --> &cpuctx_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex); lock(pmus_lock); lock(&cpuctx_mutex); lock(event_mutex); *** DEADLOCK *** 1 lock held by syz-executor.0/27848: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 0 PID: 27848 Comm: syz-executor.0 Not tainted 4.14.215-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+0x1b2/0x283 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 ftrace_profile_set_filter+0x64/0x1be kernel/trace/trace_events_filter.c:2268 perf_event_set_filter kernel/events/core.c:8719 [inline] _perf_ioctl+0x13b2/0x1a40 kernel/events/core.c:4850 perf_ioctl+0x55/0x80 kernel/events/core.c:4887 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45e219 RSP: 002b:00007f3659c0ac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045e219 RDX: 0000000020000040 RSI: 0000000040082406 RDI: 0000000000000003 RBP: 000000000119bfc0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119bf8c R13: 00007ffcfa4e2edf R14: 00007f3659c0b9c0 R15: 000000000119bf8c kauditd_printk_skb: 33 callbacks suppressed audit: type=1804 audit(1610888729.643:96): pid=28021 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir551376552/syzkaller.jzMKeQ/774/bus" dev="sda1" ino=17197 res=1 audit: type=1800 audit(1610888729.723:97): pid=28032 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=17198 res=0 audit: type=1800 audit(1610888729.733:98): pid=28032 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="bus" dev="sda1" ino=17198 res=0 audit: type=1804 audit(1610888729.823:99): pid=28042 uid=0 auid=0 ses=4 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir551376552/syzkaller.jzMKeQ/774/bus" dev="sda1" ino=17197 res=1 VFS: unable to find oldfs superblock on device loop5 audit: type=1800 audit(1610888730.173:100): pid=28135 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=17202 res=0 print_req_error: I/O error, dev loop5, sector 4 buffer_io_error: 2 callbacks suppressed Buffer I/O error on dev loop5, logical block 2, async page read print_req_error: I/O error, dev loop5, sector 6 audit: type=1800 audit(1610888730.213:101): pid=28143 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=17202 res=0 Buffer I/O error on dev loop5, logical block 3, async page read VFS: unable to find oldfs superblock on device loop5 audit: type=1800 audit(1610888730.413:102): pid=28187 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=17184 res=0 audit: type=1800 audit(1610888730.443:103): pid=28187 uid=0 auid=0 ses=4 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="bus" dev="sda1" ino=17184 res=0 VFS: unable to find oldfs superblock on device loop5 audit: type=1326 audit(1610888730.563:104): auid=0 uid=0 gid=0 ses=4 pid=28206 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=228 compat=0 ip=0x46107a code=0x0 VFS: unable to find oldfs superblock on device loop5 print_req_error: I/O error, dev loop5, sector 4 Buffer I/O error on dev loop5, logical block 2, async page read print_req_error: I/O error, dev loop5, sector 6 Buffer I/O error on dev loop5, logical block 3, async page read audit: type=1326 audit(1610888731.343:105): auid=0 uid=0 gid=0 ses=4 pid=28206 comm="syz-executor.3" exe="/root/syz-executor.3" sig=31 arch=c000003e syscall=228 compat=0 ip=0x46107a code=0x0