syz-executor.4 (pid 7178) is setting deprecated v1 encryption policy; recommend upgrading to v2. ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc2-syzkaller-00383-gb8481381d4e2 #0 Not tainted ------------------------------------------------------ syz-executor.4/7178 is trying to acquire lock: ffff88805efae228 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline] ffff88805efae228 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x4d/0x2f0 fs/overlayfs/util.c:719 but task is already holding lock: ffff88802aaa8420 (sb_writers#5){.+.+}-{0:0}, at: ovl_tmpfile+0x15b/0x6f0 fs/overlayfs/dir.c:1363 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (sb_writers#5){.+.+}-{0:0}: percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1655 [inline] sb_start_write include/linux/fs.h:1791 [inline] ovl_start_write+0x130/0x310 fs/overlayfs/util.c:31 ovl_do_copy_up fs/overlayfs/copy_up.c:967 [inline] ovl_copy_up_one+0x82a/0x3490 fs/overlayfs/copy_up.c:1168 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_link+0x31/0x220 fs/overlayfs/dir.c:716 vfs_link+0x83e/0xe50 fs/namei.c:4613 do_linkat+0x533/0x5e0 fs/namei.c:4683 __do_sys_link fs/namei.c:4717 [inline] __se_sys_link fs/namei.c:4715 [inline] __x64_sys_link+0x81/0xa0 fs/namei.c:4715 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&ovl_i_lock_key[depth]){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline] ovl_copy_up_start+0x4d/0x2f0 fs/overlayfs/util.c:719 ovl_copy_up_one+0x59c/0x3490 fs/overlayfs/copy_up.c:1161 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_create_tmpfile fs/overlayfs/dir.c:1317 [inline] ovl_tmpfile+0x2b8/0x6f0 fs/overlayfs/dir.c:1373 vfs_tmpfile+0x2be/0x540 fs/namei.c:3701 do_tmpfile fs/namei.c:3764 [inline] path_openat+0xc8e/0x29f0 fs/namei.c:3798 do_filp_open+0x1dc/0x430 fs/namei.c:3834 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_sys_open fs/open.c:1428 [inline] __se_sys_open fs/open.c:1424 [inline] __x64_sys_open+0x154/0x1e0 fs/open.c:1424 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(sb_writers#5); lock(&ovl_i_lock_key[depth]); lock(sb_writers#5); lock(&ovl_i_lock_key[depth]); *** DEADLOCK *** 2 locks held by syz-executor.4/7178: #0: ffff88802d7b2420 (sb_writers#16){.+.+}-{0:0}, at: do_tmpfile fs/namei.c:3761 [inline] #0: ffff88802d7b2420 (sb_writers#16){.+.+}-{0:0}, at: path_openat+0xc0f/0x29f0 fs/namei.c:3798 #1: ffff88802aaa8420 (sb_writers#5){.+.+}-{0:0}, at: ovl_tmpfile+0x15b/0x6f0 fs/overlayfs/dir.c:1363 stack backtrace: CPU: 1 PID: 7178 Comm: syz-executor.4 Not tainted 6.10.0-rc2-syzkaller-00383-gb8481381d4e2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline] ovl_copy_up_start+0x4d/0x2f0 fs/overlayfs/util.c:719 ovl_copy_up_one+0x59c/0x3490 fs/overlayfs/copy_up.c:1161 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_create_tmpfile fs/overlayfs/dir.c:1317 [inline] ovl_tmpfile+0x2b8/0x6f0 fs/overlayfs/dir.c:1373 vfs_tmpfile+0x2be/0x540 fs/namei.c:3701 do_tmpfile fs/namei.c:3764 [inline] path_openat+0xc8e/0x29f0 fs/namei.c:3798 do_filp_open+0x1dc/0x430 fs/namei.c:3834 do_sys_openat2+0x17a/0x1e0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_sys_open fs/open.c:1428 [inline] __se_sys_open fs/open.c:1424 [inline] __x64_sys_open+0x154/0x1e0 fs/open.c:1424 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fef1ba7cf69 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fef1c8990c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fef1bbb3f80 RCX: 00007fef1ba7cf69 RDX: 0000000000000000 RSI: 0000000000591002 RDI: 0000000020000100 RBP: 00007fef1bada6fe R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007fef1bbb3f80 R15: 00007fff56120d68