====================================================== WARNING: possible circular locking dependency detected 4.14.232-syzkaller #0 Not tainted new mount options do not match the existing superblock, will be ignored ------------------------------------------------------ syz-executor.5/22502 is trying to acquire lock: (&event->child_mutex){+.+.}, at: [] perf_event_read_value+0x78/0x410 kernel/events/core.c:4453 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: -> #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: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 -> #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: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 -> #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:295 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: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 -> #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: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 -> #1 (event_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 perf_trace_destroy+0x23/0xf0 kernel/trace/trace_event_perf.c:234 _free_event+0x321/0xe20 kernel/events/core.c:4244 free_event+0x32/0x40 kernel/events/core.c:4271 perf_event_release_kernel+0x368/0x8a0 kernel/events/core.c:4415 perf_release+0x33/0x40 kernel/events/core.c:4441 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&event->child_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 perf_event_read_value+0x78/0x410 kernel/events/core.c:4453 perf_read_one kernel/events/core.c:4575 [inline] __perf_read kernel/events/core.c:4626 [inline] perf_read+0x3e2/0x7c0 kernel/events/core.c:4639 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_readv+0xfc/0x2c0 fs/read_write.c:1014 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->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-executor.5/22502: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1241 stack backtrace: CPU: 1 PID: 22502 Comm: syz-executor.5 Not tainted 4.14.232-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+0x1b2/0x281 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 perf_event_read_value+0x78/0x410 kernel/events/core.c:4453 perf_read_one kernel/events/core.c:4575 [inline] __perf_read kernel/events/core.c:4626 [inline] perf_read+0x3e2/0x7c0 kernel/events/core.c:4639 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3eb/0x5b0 fs/read_write.c:919 vfs_readv+0xc8/0x120 fs/read_write.c:981 do_readv+0xfc/0x2c0 fs/read_write.c:1014 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x4665d9 RSP: 002b:00007f0320c3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 00000000004665d9 RDX: 0000000000000001 RSI: 00000000200002c0 RDI: 0000000000000005 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fffab2e70bf R14: 00007f0320c3b300 R15: 0000000000022000 EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue sd 0:0:1:0: PR command failed: 134217730 sd 0:0:1:0: Sense Key : Illegal Request [current] sd 0:0:1:0: Add. Sense: Invalid command operation code new mount options do not match the existing superblock, will be ignored EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected vhci_hcd: invalid port number 9 vhci_hcd: default hub control req: 0506 v00ff i0009 l1920 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected vhci_hcd: invalid port number 9 vhci_hcd: default hub control req: 0506 v00ff i0009 l1920 hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected vhci_hcd: invalid port number 9 vhci_hcd: default hub control req: 0506 v00ff i0009 l1920 new mount options do not match the existing superblock, will be ignored PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created hub 9-0:1.0: USB hub found hub 9-0:1.0: 8 ports detected EXT4-fs (loop3): mounted filesystem without journal. Opts: ,errors=continue vhci_hcd: invalid port number 9 vhci_hcd: default hub control req: 0506 v00ff i0009 l1920 PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created PM: Basic memory bitmaps freed PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. PM: Basic memory bitmaps freed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. PM: Marking nosave pages: [mem 0x00000000-0x00000fff] PM: Marking nosave pages: [mem 0x0009f000-0x000fffff] PM: Marking nosave pages: [mem 0xbfffd000-0xffffffff] PM: Basic memory bitmaps created netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. net_ratelimit: 4 callbacks suppressed GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog PM: Basic memory bitmaps freed audit: type=1800 audit(1621139061.332:104): pid=22889 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=14997 res=0 x_tables: ip6_tables: TCPMSS target: only valid for protocol 6 audit: type=1800 audit(1621139061.412:105): pid=22905 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=14997 res=0 x_tables: ip6_tables: TCPMSS target: only valid for protocol 6 audit: type=1800 audit(1621139061.522:106): pid=22917 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=14997 res=0 audit: type=1800 audit(1621139062.052:107): pid=22938 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=15015 res=0 x_tables: ip6_tables: TCPMSS target: only valid for protocol 6 audit: type=1800 audit(1621139062.102:108): pid=22943 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=15017 res=0 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog audit: type=1800 audit(1621139062.292:109): pid=22961 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=15016 res=0 x_tables: ip6_tables: TCPMSS target: only valid for protocol 6 IPv6: ADDRCONF(NETDEV_CHANGE): veth1_macvtap: link becomes ready GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog ubi0: attaching mtd0 ubi0: scanning is finished audit: type=1800 audit(1621139062.572:110): pid=22987 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.3" name="file0" dev="sda1" ino=15017 res=0 ubi0: empty MTD device detected x_tables: ip6_tables: TCPMSS target: only valid for protocol 6 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog veth1_macvtap: Invalid MTU -1 requested, hw min 68 GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog GRED: Unable to relocate VQ 0x0 after dequeue, screwing up backlog ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 0/0, WL threshold: 4096, image sequence number: 1289065733 overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "nfs_export=on" or missing value ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 23016 ubi0: detaching mtd0 ubi0: mtd0 is detached ubi0: attaching mtd0 ubi0: scanning is finished overlayfs: fs on '.' does not support file handles, falling back to index=off. overlayfs: filesystem on './bus' not supported as upperdir overlayfs: unrecognized mount option "nfs_export=on" or missing value overlayfs: 'file0' not a directory ubi0 error: ubi_attach_mtd_dev: cannot spawn "ubi_bgt0d", error -4 ubi0: attaching mtd0 ubi0: scanning is finished overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "nfs_export=on" or missing value ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 1/1, WL threshold: 4096, image sequence number: 1289065733 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 23086 ubi0: detaching mtd0 ubi0: mtd0 is detached ubi0: attaching mtd0 overlayfs: fs on 'file0' does not support file handles, falling back to index=off. program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO ubi0: scanning is finished sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "nfs_export=on" or missing value ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 program syz-executor.5 is using a deprecated SCSI ioctl, please convert it to SG_IO ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 1289065733 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 sd 0:0:1:0: ioctl_internal_command: ILLEGAL REQUEST asc=0x20 ascq=0x0 ubi0: background thread "ubi_bgt0d" started, PID 23136 ubi0: detaching mtd0 ubi0: mtd0 is detached ubi0: attaching mtd0 ubi0: scanning is finished ubi0: attached mtd0 (name "mtdram test device", size 0 MiB) ubi0: PEB size: 4096 bytes (4 KiB), LEB size: 3968 bytes ubi0: min./max. I/O unit sizes: 1/64, sub-page size 1 ubi0: VID header offset: 64 (aligned 64), data offset: 128 ubi0: good PEBs: 32, bad PEBs: 0, corrupted PEBs: 0 ubi0: user volume: 0, internal volumes: 1, max. volumes count: 23 ubi0: max/mean erase counter: 2/1, WL threshold: 4096, image sequence number: 1289065733 ubi0: available PEBs: 28, total reserved PEBs: 4, PEBs reserved for bad PEB handling: 0 ubi0: background thread "ubi_bgt0d" started, PID 23153 ubi0: detaching mtd0 ubi0: mtd0 is detached overlayfs: fs on 'file0' does not support file handles, falling back to index=off. overlayfs: fs on './file0' does not support file handles, falling back to index=off. overlayfs: unrecognized mount option "nfs_export=on" or missing value attempt to access beyond end of device loop4: rw=1, want=128, limit=8 cramfs: Error -3 while decompressing! cramfs: ffffffff8bf2df78(27)->ffff888053f49000(4096) attempt to access beyond end of device loop2: rw=1, want=128, limit=8 cramfs: Error -3 while decompressing!