====================================================== WARNING: possible circular locking dependency detected 4.14.182-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/19888 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [] __might_fault+0xd4/0x1b0 mm/memory.c:4583 but task is already holding lock: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1235 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&cpuctx_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1430 kernel/locking/mutex.c:893 perf_event_init_cpu+0xb7/0x170 kernel/events/core.c:11244 perf_event_init+0x2cc/0x308 kernel/events/core.c:11291 start_kernel+0x46b/0x771 init/main.c:620 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:240 -> #2 (pmus_lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xe8/0x1430 kernel/locking/mutex.c:893 perf_event_init_cpu+0x2c/0x170 kernel/events/core.c:11238 cpuhp_invoke_callback+0x1e6/0x1a90 kernel/cpu.c:184 cpuhp_up_callbacks kernel/cpu.c:572 [inline] _cpu_up+0x21a/0x520 kernel/cpu.c:1140 do_cpu_up kernel/cpu.c:1175 [inline] do_cpu_up+0x9a/0x160 kernel/cpu.c:1147 smp_init+0x197/0x1ac kernel/smp.c:578 kernel_init_freeable+0x3f4/0x615 init/main.c:1068 kernel_init+0xd/0x15b init/main.c:1000 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 -> #1 (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_dec kernel/jump_label.c:213 [inline] static_key_slow_dec+0x47/0x70 kernel/jump_label.c:228 sw_perf_event_destroy+0x7b/0x110 kernel/events/core.c:7940 _free_event+0x328/0xe50 kernel/events/core.c:4238 put_event+0x20/0x30 kernel/events/core.c:4324 perf_mmap_close+0x3d9/0xc00 kernel/events/core.c:5283 remove_vma+0xa9/0x1a0 mm/mmap.c:167 remove_vma_list mm/mmap.c:2505 [inline] do_munmap+0x5cc/0xc40 mm/mmap.c:2746 mmap_region+0x16e/0x1060 mm/mmap.c:1658 do_mmap+0x5b3/0xcb0 mm/mmap.c:1495 do_mmap_pgoff include/linux/mm.h:2173 [inline] vm_mmap_pgoff+0x14e/0x1a0 mm/util.c:333 SYSC_mmap_pgoff mm/mmap.c:1545 [inline] SyS_mmap_pgoff+0x249/0x510 mm/mmap.c:1503 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (&mm->mmap_sem){++++}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __might_fault mm/memory.c:4584 [inline] __might_fault+0x137/0x1b0 mm/memory.c:4569 _copy_to_user+0x27/0xd0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] perf_read_one kernel/events/core.c:4577 [inline] __perf_read kernel/events/core.c:4620 [inline] perf_read+0x54c/0x7c0 kernel/events/core.c:4633 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3e3/0x5a0 fs/read_write.c:919 vfs_readv+0xd3/0x130 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: &mm->mmap_sem --> pmus_lock --> &cpuctx_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&cpuctx_mutex); lock(pmus_lock); lock(&cpuctx_mutex); lock(&mm->mmap_sem); *** DEADLOCK *** 1 lock held by syz-executor.3/19888: #0: (&cpuctx_mutex){+.+.}, at: [] perf_event_ctx_lock_nested+0x14d/0x2c0 kernel/events/core.c:1235 stack backtrace: CPU: 0 PID: 19888 Comm: syz-executor.3 Not tainted 4.14.182-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.isra.0.cold+0x2dc/0x425 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+0x3057/0x42a0 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __might_fault mm/memory.c:4584 [inline] __might_fault+0x137/0x1b0 mm/memory.c:4569 _copy_to_user+0x27/0xd0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] perf_read_one kernel/events/core.c:4577 [inline] __perf_read kernel/events/core.c:4620 [inline] perf_read+0x54c/0x7c0 kernel/events/core.c:4633 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3e3/0x5a0 fs/read_write.c:919 vfs_readv+0xd3/0x130 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: 0033:0x45ca69 RSP: 002b:00007f11b1aadc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000013 RAX: ffffffffffffffda RBX: 00000000004fb300 RCX: 000000000045ca69 RDX: 0000000000000004 RSI: 000000002058c000 RDI: 0000000000000005 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000892 R14: 00000000004cb498 R15: 00007f11b1aae6d4 netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. netlink: 20 bytes leftover after parsing attributes in process `syz-executor.5'. ceph: device name is missing path (no : separator in [d::],0::6:<=6ç¸“˜…Ì»<:î."Éï"Vàg õ) audit: type=1800 audit(1591090552.517:220): pid=19965 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="collect_data" cause="failed(directio)" comm="syz-executor.2" name="file0" dev="sda1" ino=16323 res=0 MINIX-fs: mounting unchecked file system, running fsck is recommended ceph: device name is missing path (no : separator in [d::],0::6:<=6ç¸“˜…Ì»<:î."Éï"Vàg õ) netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. minix_free_inode: bit 1 already cleared netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: upperdir is in-use by another mount, mount with '-o index=off' to override exclusive upperdir protection. 9pnet: p9_fd_create_tcp (19961): problem connecting socket to 127.0.0.1 9pnet: p9_fd_create_tcp (19975): problem connecting socket to 127.0.0.1 netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value netlink: 5 bytes leftover after parsing attributes in process `syz-executor.1'. overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value ip_tables: iptables: counters copy to user failed while replacing table overlayfs: unrecognized mount option "wordir=./file1\" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value overlayfs: unrecognized mount option "wordir=./file1\" or missing value overlayfs: unrecognized mount option "upperd½$âÖ?e" or missing value ip_tables: iptables: counters copy to user failed while replacing table audit: type=1804 audit(1591090555.967:221): pid=20216 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir732893578/syzkaller.wRtKPT/275/bus" dev="sda1" ino=16324 res=1 audit: type=1804 audit(1591090556.007:222): pid=20216 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir732893578/syzkaller.wRtKPT/275/bus" dev="sda1" ino=16324 res=1 audit: type=1804 audit(1591090556.557:223): pid=20221 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir732893578/syzkaller.wRtKPT/275/bus" dev="sda1" ino=16324 res=1 ISOFS: Logical zone size(0) < hardware blocksize(1024) BTRFS: device fsid fff6f2a2-2997-48ae-b81e-1b00b10efd9a devid 0 transid 0 /dev/loop5 ISOFS: Logical zone size(0) < hardware blocksize(1024) BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed XFS (loop2): bad version XFS (loop2): SB validate failed with error -22. XFS (loop2): bad version XFS (loop2): SB validate failed with error -22. new mount options do not match the existing superblock, will be ignored new mount options do not match the existing superblock, will be ignored nla_parse: 17 callbacks suppressed netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. overlayfs: filesystem on './file0' not supported as upperdir netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. ieee80211 phy13: Selected rate control algorithm 'minstrel_ht' ieee80211 phy13: hwaddr 02:00:00:00:0d:00 registered netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. hfsplus: invalid gid specified hfsplus: unable to parse mount options netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1591090559.467:224): pid=20552 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir165900567/syzkaller.XX9o0T/223/bus" dev="sda1" ino=16133 res=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1591090559.497:225): pid=20552 uid=0 auid=0 ses=4 subj=system_u:system_r:kernel_t:s0 op="invalid_pcr" cause="open_writers" comm="syz-executor.5" name="/root/syzkaller-testdir165900567/syzkaller.XX9o0T/223/bus" dev="sda1" ino=16133 res=1 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. binder: 20592:20598 ioctl c0306201 20000540 returned -14 netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. ieee80211 phy14: Selected rate control algorithm 'minstrel_ht' ieee80211 phy14: hwaddr 02:00:00:00:0e:00 registered ieee80211 phy15: Selected rate control algorithm 'minstrel_ht' ieee80211 phy15: hwaddr 02:00:00:00:0f:00 registered netlink: 24 bytes leftover after parsing attributes in process `syz-executor.0'. netlink: 24 bytes leftover after parsing attributes in process `syz-executor.5'. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 20679 Comm: syz-executor.4 Not tainted 4.14.182-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 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0x10a/0x154 lib/fault-inject.c:149 should_failslab+0xd6/0x130 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:421 [inline] slab_alloc mm/slab.c:3376 [inline] kmem_cache_alloc_trace+0x2b7/0x3f0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] kzalloc include/linux/slab.h:661 [inline] rtentry_to_fib_config net/ipv4/fib_frontend.c:545 [inline] ip_rt_ioctl+0x7e4/0xce0 net/ipv4/fib_frontend.c:585 inet_ioctl+0x124/0x190 net/ipv4/af_inet.c:882 sock_do_ioctl+0x5f/0xa0 net/socket.c:974 sock_ioctl+0x28d/0x450 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xfe0 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: 0033:0x45ca69 RSP: 002b:00007f404ba39c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004f3f00 RCX: 000000000045ca69 RDX: 0000000020000600 RSI: 000000000000890b RDI: 0000000000000003 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 00000000000006c2 R14: 00000000004c9a4f R15: 00007f404ba3a6d4