loop0: detected capacity change from 0 to 512 ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.0/5334 is trying to acquire lock: ffff8880432e0660 (&oi->ip_alloc_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932 but task is already holding lock: ffff8880432e06f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320 fs/ocfs2/refcounttree.c:931 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&oi->ip_xattr_sem){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 ocfs2_init_acl+0x2f9/0x720 fs/ocfs2/acl.c:366 ocfs2_mknod+0x1321/0x2050 fs/ocfs2/namei.c:413 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:659 vfs_mkdir+0x306/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdir fs/namei.c:4508 [inline] __se_sys_mkdir fs/namei.c:4506 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4506 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #3 (jbd2_handle){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 start_this_handle+0x1fa7/0x21c0 fs/jbd2/transaction.c:444 jbd2__journal_start+0x2c1/0x5b0 fs/jbd2/transaction.c:501 jbd2_journal_start+0x2a/0x40 fs/jbd2/transaction.c:540 ocfs2_start_trans+0x376/0x6d0 fs/ocfs2/journal.c:374 ocfs2_mknod+0xe93/0x2050 fs/ocfs2/namei.c:364 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:659 vfs_mkdir+0x306/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdir fs/namei.c:4508 [inline] __se_sys_mkdir fs/namei.c:4506 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4506 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #2 (&journal->j_trans_barrier){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1537 ocfs2_start_trans+0x36a/0x6d0 fs/ocfs2/journal.c:372 ocfs2_mknod+0xe93/0x2050 fs/ocfs2/namei.c:364 ocfs2_mkdir+0x191/0x440 fs/ocfs2/namei.c:659 vfs_mkdir+0x306/0x510 fs/namei.c:4453 do_mkdirat+0x247/0x590 fs/namei.c:4486 __do_sys_mkdir fs/namei.c:4508 [inline] __se_sys_mkdir fs/namei.c:4506 [inline] __x64_sys_mkdir+0x6c/0x80 fs/namei.c:4506 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (sb_internal#2){.+.+}-{0:0}: reacquire_held_locks+0x127/0x1d0 kernel/locking/lockdep.c:5385 __lock_release kernel/locking/lockdep.c:5574 [inline] lock_release+0x1b4/0x3e0 kernel/locking/lockdep.c:5889 up_write+0x2d/0x420 kernel/locking/rwsem.c:1642 inode_unlock include/linux/fs.h:989 [inline] ocfs2_free_ac_resource fs/ocfs2/suballoc.c:130 [inline] ocfs2_free_alloc_context+0x97/0x1a0 fs/ocfs2/suballoc.c:144 ocfs2_write_begin_nolock+0x4296/0x4340 fs/ocfs2/aops.c:1804 ocfs2_write_begin+0x1bb/0x310 fs/ocfs2/aops.c:1884 generic_perform_write+0x2c5/0x900 mm/filemap.c:4242 ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469 do_iter_readv_writev+0x623/0x8c0 fs/read_write.c:-1 vfs_writev+0x31a/0x960 fs/read_write.c:1057 do_pwritev fs/read_write.c:1153 [inline] __do_sys_pwritev2 fs/read_write.c:1211 [inline] __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1202 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&oi->ip_alloc_sem){++++}-{4:4}: check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932 ocfs2_xattr_set+0x595/0x11f0 fs/ocfs2/xattr.c:3669 ocfs2_set_acl+0x701/0x7b0 fs/ocfs2/acl.c:254 ocfs2_iop_set_acl+0x1aa/0x2a0 fs/ocfs2/acl.c:286 set_posix_acl fs/posix_acl.c:954 [inline] vfs_remove_acl+0x48c/0x700 fs/posix_acl.c:1241 ovl_do_remove_acl fs/overlayfs/overlayfs.h:355 [inline] ovl_workdir_create+0x594/0x8b0 fs/overlayfs/super.c:364 ovl_make_workdir fs/overlayfs/super.c:679 [inline] ovl_get_workdir+0x32b/0x17b0 fs/overlayfs/super.c:837 ovl_fill_super+0x154a/0x3da0 fs/overlayfs/super.c:1468 vfs_get_super fs/super.c:1324 [inline] get_tree_nodev+0xb8/0x150 fs/super.c:1343 vfs_get_tree+0x8f/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: &oi->ip_alloc_sem --> jbd2_handle --> &oi->ip_xattr_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&oi->ip_xattr_sem); lock(jbd2_handle); lock(&oi->ip_xattr_sem); lock(&oi->ip_alloc_sem); *** DEADLOCK *** 4 locks held by syz.0.0/5334: #0: ffff888032f220e0 (&type->s_umount_key#50/1){+.+.}-{4:4}, at: alloc_super+0x1bb/0x930 fs/super.c:344 #1: ffff88803e8f4420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:508 #2: ffff8880432e09c0 (&sb->s_type->i_mutex_key#20){++++}-{4:4}, at: inode_lock include/linux/fs.h:979 [inline] #2: ffff8880432e09c0 (&sb->s_type->i_mutex_key#20){++++}-{4:4}, at: vfs_remove_acl+0xf9/0x700 fs/posix_acl.c:1222 #3: ffff8880432e06f8 (&oi->ip_xattr_sem){++++}-{4:4}, at: ocfs2_try_remove_refcount_tree+0xa4/0x320 fs/ocfs2/refcounttree.c:931 stack backtrace: CPU: 0 UID: 0 PID: 5334 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2043 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2175 check_prev_add kernel/locking/lockdep.c:3165 [inline] check_prevs_add kernel/locking/lockdep.c:3284 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3908 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5237 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5868 down_write+0x96/0x1f0 kernel/locking/rwsem.c:1590 ocfs2_try_remove_refcount_tree+0xb6/0x320 fs/ocfs2/refcounttree.c:932 ocfs2_xattr_set+0x595/0x11f0 fs/ocfs2/xattr.c:3669 ocfs2_set_acl+0x701/0x7b0 fs/ocfs2/acl.c:254 ocfs2_iop_set_acl+0x1aa/0x2a0 fs/ocfs2/acl.c:286 set_posix_acl fs/posix_acl.c:954 [inline] vfs_remove_acl+0x48c/0x700 fs/posix_acl.c:1241 ovl_do_remove_acl fs/overlayfs/overlayfs.h:355 [inline] ovl_workdir_create+0x594/0x8b0 fs/overlayfs/super.c:364 ovl_make_workdir fs/overlayfs/super.c:679 [inline] ovl_get_workdir+0x32b/0x17b0 fs/overlayfs/super.c:837 ovl_fill_super+0x154a/0x3da0 fs/overlayfs/super.c:1468 vfs_get_super fs/super.c:1324 [inline] get_tree_nodev+0xb8/0x150 fs/super.c:1343 vfs_get_tree+0x8f/0x2b0 fs/super.c:1751 fc_mount fs/namespace.c:1208 [inline] do_new_mount_fc fs/namespace.c:3651 [inline] do_new_mount+0x302/0xa10 fs/namespace.c:3727 do_mount fs/namespace.c:4050 [inline] __do_sys_mount fs/namespace.c:4238 [inline] __se_sys_mount+0x313/0x410 fs/namespace.c:4215 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fce6c58eec9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fce6d46c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fce6c7e6090 RCX: 00007fce6c58eec9 RDX: 0000200000000000 RSI: 0000200000000040 RDI: 0000000000000000 RBP: 00007fce6c611f91 R08: 0000200000000100 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fce6c7e6128 R14: 00007fce6c7e6090 R15: 00007ffc99302c78 overlayfs: upper fs does not support tmpfile. overlayfs: upper fs does not support RENAME_WHITEOUT. overlayfs: upper fs missing required features.