ext4 filesystem being mounted at /syzkaller-testdir2286987078/syzkaller.q47DVf/372/file0 supports timestamps until 2038 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc6-syzkaller-00016-g0d3eb744aed4 #0 Not tainted ------------------------------------------------------ syz-executor.2/16943 is trying to acquire lock: ffff888076e65cd0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 but task is already holding lock: ffff888023886208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8f/0x250 fs/quota/quota_v2.c:354 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4d/0x120 fs/quota/quota_v2.c:332 dquot_acquire+0x1b3/0x6c0 fs/quota/dquot.c:435 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770 dqget+0x67d/0x1080 fs/quota/dquot.c:914 __dquot_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_rename+0x297/0x2790 fs/ext4/namei.c:3798 ext4_rename2+0x1c7/0x270 fs/ext4/namei.c:4200 vfs_rename+0xef6/0x17a0 fs/namei.c:4772 do_renameat2+0xb62/0xc90 fs/namei.c:4923 __do_sys_renameat2 fs/namei.c:4956 [inline] __se_sys_renameat2 fs/namei.c:4953 [inline] __ia32_sys_renameat2+0xe8/0x120 fs/namei.c:4953 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x12f/0x1350 kernel/locking/mutex.c:747 dquot_commit+0x51/0x570 fs/quota/dquot.c:479 ext4_write_dquot+0x25f/0x330 fs/ext4/super.c:6754 ext4_mark_dquot_dirty fs/ext4/super.c:6802 [inline] ext4_mark_dquot_dirty+0x115/0x1b0 fs/ext4/super.c:6796 mark_dquot_dirty fs/quota/dquot.c:346 [inline] mark_all_dquot_dirty fs/quota/dquot.c:384 [inline] __dquot_alloc_space+0x5f9/0xb80 fs/quota/dquot.c:1722 dquot_alloc_space_nodirty include/linux/quotaops.h:300 [inline] dquot_alloc_space include/linux/quotaops.h:313 [inline] dquot_alloc_block include/linux/quotaops.h:337 [inline] ext4_mb_new_blocks+0x5d5/0x4b20 fs/ext4/mballoc.c:5571 ext4_alloc_branch fs/ext4/indirect.c:340 [inline] ext4_ind_map_blocks+0x15c8/0x2350 fs/ext4/indirect.c:635 ext4_map_blocks+0xbed/0x18d0 fs/ext4/inode.c:653 _ext4_get_block+0x241/0x580 fs/ext4/inode.c:807 ext4_block_write_begin+0x570/0x1780 fs/ext4/inode.c:1097 ext4_write_begin+0x53c/0x1000 fs/ext4/inode.c:1229 ext4_da_write_begin+0x222/0xa10 fs/ext4/inode.c:3057 generic_perform_write+0x256/0x570 mm/filemap.c:3926 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:289 ext4_file_write_iter+0xbe0/0x1740 fs/ext4/file.c:710 call_write_iter include/linux/fs.h:1851 [inline] do_iter_readv_writev+0x20b/0x3b0 fs/read_write.c:735 do_iter_write+0x182/0x700 fs/read_write.c:861 vfs_iter_write+0x74/0xa0 fs/read_write.c:902 iter_file_splice_write+0x743/0xc80 fs/splice.c:778 do_splice_from fs/splice.c:856 [inline] direct_splice_actor+0x114/0x180 fs/splice.c:1022 splice_direct_to_actor+0x335/0x8a0 fs/splice.c:977 do_splice_direct+0x1ab/0x280 fs/splice.c:1065 do_sendfile+0xb19/0x12c0 fs/read_write.c:1255 __do_compat_sys_sendfile fs/read_write.c:1344 [inline] __se_compat_sys_sendfile fs/read_write.c:1327 [inline] __ia32_compat_sys_sendfile+0x1e1/0x220 fs/read_write.c:1327 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 ext4_getblk+0x61f/0x850 fs/ext4/inode.c:863 ext4_bread+0x2e/0x190 fs/ext4/inode.c:919 ext4_quota_write+0x218/0x620 fs/ext4/super.c:7135 write_blk+0x12e/0x220 fs/quota/quota_tree.c:64 get_free_dqblk+0x104/0x2f0 fs/quota/quota_tree.c:130 do_insert_tree+0x3c5/0x12d0 fs/quota/quota_tree.c:340 do_insert_tree+0x696/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770 dqget+0x67d/0x1080 fs/quota/dquot.c:914 dquot_transfer+0x3af/0x6f0 fs/quota/dquot.c:2103 ext4_setattr+0x10bb/0x2870 fs/ext4/inode.c:5496 notify_change+0xb2c/0x1180 fs/attr.c:482 chown_common+0x57f/0x650 fs/open.c:774 do_fchownat+0x12a/0x1e0 fs/open.c:805 ksys_lchown include/linux/syscalls.h:1336 [inline] __do_sys_lchown16 kernel/uid16.c:30 [inline] __se_sys_lchown16 kernel/uid16.c:28 [inline] __ia32_sys_lchown16+0xe3/0x110 kernel/uid16.c:28 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: &ei->i_data_sem/2 --> &dquot->dq_lock --> &s->s_dquot.dqio_sem Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&s->s_dquot.dqio_sem); lock(&dquot->dq_lock); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); *** DEADLOCK *** 5 locks held by syz-executor.2/16943: #0: ffff888023886460 (sb_writers#4){.+.+}-{0:0}, at: do_fchownat+0x105/0x1e0 fs/open.c:802 #1: ffff888076e62c20 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff888076e62c20 (&type->i_mutex_dir_key#3){++++}-{3:3}, at: chown_common+0x31d/0x650 fs/open.c:764 #2: ffff888076e628e8 (&ei->xattr_sem){++++}-{3:3}, at: ext4_setattr+0x10ac/0x2870 fs/ext4/inode.c:5495 #3: ffff888044ed7ca8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x51/0x6c0 fs/quota/dquot.c:432 #4: ffff888023886208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8f/0x250 fs/quota/quota_v2.c:354 stack backtrace: CPU: 2 PID: 16943 Comm: syz-executor.2 Not tainted 6.3.0-rc6-syzkaller-00016-g0d3eb744aed4 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x25f/0x2e0 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3098 [inline] check_prevs_add kernel/locking/lockdep.c:3217 [inline] validate_chain kernel/locking/lockdep.c:3832 [inline] __lock_acquire+0x2ec7/0x5d40 kernel/locking/lockdep.c:5056 lock_acquire kernel/locking/lockdep.c:5669 [inline] lock_acquire+0x1af/0x520 kernel/locking/lockdep.c:5634 down_read+0x3d/0x50 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 ext4_getblk+0x61f/0x850 fs/ext4/inode.c:863 ext4_bread+0x2e/0x190 fs/ext4/inode.c:919 ext4_quota_write+0x218/0x620 fs/ext4/super.c:7135 write_blk+0x12e/0x220 fs/quota/quota_tree.c:64 get_free_dqblk+0x104/0x2f0 fs/quota/quota_tree.c:130 do_insert_tree+0x3c5/0x12d0 fs/quota/quota_tree.c:340 do_insert_tree+0x696/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375 do_insert_tree+0x488/0x12d0 fs/quota/quota_tree.c:375 dq_insert_tree fs/quota/quota_tree.c:401 [inline] qtree_write_dquot+0x3b4/0x570 fs/quota/quota_tree.c:420 v2_write_dquot+0x120/0x250 fs/quota/quota_v2.c:358 dquot_acquire+0x3d1/0x6c0 fs/quota/dquot.c:444 ext4_acquire_dquot+0x2b1/0x3d0 fs/ext4/super.c:6770 dqget+0x67d/0x1080 fs/quota/dquot.c:914 dquot_transfer+0x3af/0x6f0 fs/quota/dquot.c:2103 ext4_setattr+0x10bb/0x2870 fs/ext4/inode.c:5496 notify_change+0xb2c/0x1180 fs/attr.c:482 chown_common+0x57f/0x650 fs/open.c:774 do_fchownat+0x12a/0x1e0 fs/open.c:805 ksys_lchown include/linux/syscalls.h:1336 [inline] __do_sys_lchown16 kernel/uid16.c:30 [inline] __se_sys_lchown16 kernel/uid16.c:28 [inline] __ia32_sys_lchown16+0xe3/0x110 kernel/uid16.c:28 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7f6d579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7f685cc EFLAGS: 00000296 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 0000000020202020 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 retq 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi