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. ====================================================== WARNING: possible circular locking dependency detected 4.14.307-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/10627 is trying to acquire lock: (sb_writers#6){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] (sb_writers#6){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 but task is already holding lock: (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] inode_lock include/linux/fs.h:719 [inline] (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] do_last fs/namei.c:3331 [inline] (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] path_openat+0xde2/0x2970 fs/namei.c:3571 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}: down_write_killable+0x37/0xb0 kernel/locking/rwsem.c:68 iterate_dir+0x387/0x5e0 fs/readdir.c:43 ovl_dir_read fs/overlayfs/readdir.c:306 [inline] ovl_dir_read_merged+0x2c5/0x430 fs/overlayfs/readdir.c:365 ovl_check_empty_dir+0x6e/0x200 fs/overlayfs/readdir.c:870 ovl_check_empty_and_clear+0x72/0xe0 fs/overlayfs/dir.c:306 ovl_rename+0x57d/0xe50 fs/overlayfs/dir.c:959 vfs_rename+0x560/0x1820 fs/namei.c:4498 SYSC_renameat2 fs/namei.c:4646 [inline] SyS_renameat2+0x95b/0xad0 fs/namei.c:4535 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 -> #0 (sb_writers#6){.+.+}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1551 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ovl_i_mutex_dir_key[depth]#2); lock(sb_writers#6); lock(&ovl_i_mutex_dir_key[depth]#2); lock(sb_writers#6); *** DEADLOCK *** 2 locks held by syz-executor.0/10627: #0: (sb_writers#18){.+.+}, at: [] sb_start_write include/linux/fs.h:1551 [inline] #0: (sb_writers#18){.+.+}, at: [] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 #1: (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] inode_lock include/linux/fs.h:719 [inline] #1: (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] do_last fs/namei.c:3331 [inline] #1: (&ovl_i_mutex_dir_key[depth]#2){++++}, at: [] path_openat+0xde2/0x2970 fs/namei.c:3571 stack backtrace: CPU: 0 PID: 10627 Comm: syz-executor.0 Not tainted 4.14.307-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 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 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 sb_start_write include/linux/fs.h:1551 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:386 ovl_create_object+0x75/0x1d0 fs/overlayfs/dir.c:538 lookup_open+0x77a/0x1750 fs/namei.c:3241 do_last fs/namei.c:3334 [inline] path_openat+0xe08/0x2970 fs/namei.c:3571 do_filp_open+0x179/0x3c0 fs/namei.c:3605 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7f6fa07f50f9 RSP: 002b:00007f6f9ed67168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f6fa0914f80 RCX: 00007f6fa07f50f9 RDX: 000000000000275a RSI: 0000000020000240 RDI: ffffffffffffff9c RBP: 00007f6fa0850ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff9f33c89f R14: 00007f6f9ed67300 R15: 0000000000022000 audit: type=1804 audit(1677338450.541:54): pid=10590 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/36/bus" dev="sda1" ino=13951 res=1 audit: type=1804 audit(1677338450.541:55): pid=10590 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/36/bus" dev="sda1" ino=13951 res=1 XFS (loop2): Mounting V4 Filesystem audit: type=1804 audit(1677338450.541:56): pid=10590 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/36/bus" dev="sda1" ino=13951 res=1 XFS (loop2): Ending clean mount audit: type=1804 audit(1677338450.621:57): pid=10655 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/36/bus" dev="sda1" ino=13951 res=1 audit: type=1804 audit(1677338450.661:58): pid=10606 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir2097211472/syzkaller.ZzFhwU/36/file0/bus" dev="loop2" ino=41 res=1 audit: type=1804 audit(1677338450.661:59): pid=10606 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir2097211472/syzkaller.ZzFhwU/36/file0/bus" dev="loop2" ino=41 res=1 audit: type=1804 audit(1677338450.661:60): pid=10606 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.2" name="/root/syzkaller-testdir2097211472/syzkaller.ZzFhwU/36/file0/bus" dev="loop2" ino=41 res=1 audit: type=1804 audit(1677338450.771:61): pid=10658 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.2" name="/root/syzkaller-testdir2097211472/syzkaller.ZzFhwU/36/file0/bus" dev="loop2" ino=41 res=1 syz-executor.2 (10606) used greatest stack depth: 23248 bytes left XFS (loop2): Unmounting Filesystem bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state audit: type=1804 audit(1677338451.171:62): pid=10665 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/37/bus" dev="sda1" ino=14008 res=1 audit: type=1804 audit(1677338451.201:63): pid=10665 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="ToMToU" comm="syz-executor.4" name="/root/syzkaller-testdir2301235549/syzkaller.j1G6P8/37/bus" dev="sda1" ino=14008 res=1 XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Unmounting Filesystem bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered disabled state device team0 entered promiscuous mode device team_slave_0 entered promiscuous mode IPVS: ftp: loaded support on port[0] = 21 device team_slave_1 entered promiscuous mode bridge0: port 3(team0) entered blocking state bridge0: port 3(team0) entered forwarding state XFS (loop2): Mounting V4 Filesystem XFS (loop2): Ending clean mount XFS (loop2): Unmounting Filesystem bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bridge0: port 3(team0) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state device team0 left promiscuous mode device team_slave_0 left promiscuous mode device team_slave_1 left promiscuous mode bridge0: port 3(team0) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state bridge0: port 2(bridge_slave_1) entered disabled state bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state device bridge_slave_1 left promiscuous mode bridge0: port 2(bridge_slave_1) entered disabled state device bridge_slave_0 left promiscuous mode bridge0: port 1(bridge_slave_0) entered disabled state kauditd_printk_skb: 21 callbacks suppressed audit: type=1800 audit(1677338455.651:85): pid=10971 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file2" dev="sda1" ino=14079 res=0 audit: type=1800 audit(1677338456.291:86): pid=10984 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file2" dev="sda1" ino=14100 res=0 audit: type=1800 audit(1677338457.001:87): pid=11005 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file2" dev="sda1" ino=14101 res=0 audit: type=1800 audit(1677338457.241:88): pid=11006 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file2" dev="sda1" ino=14102 res=0 audit: type=1800 audit(1677338457.552:89): pid=11012 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.4" name="file2" dev="sda1" ino=14100 res=0 audit: type=1800 audit(1677338458.502:90): pid=11033 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.0" name="file2" dev="sda1" ino=14103 res=0 audit: type=1800 audit(1677338458.722:91): pid=11032 uid=0 auid=4294967295 ses=4294967295 op="collect_data" cause="failed(directio)" comm="syz-executor.1" name="file2" dev="sda1" ino=14104 res=0