====================================================== WARNING: possible circular locking dependency detected 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #0 Not tainted ------------------------------------------------------ syz-executor.3/27874 is trying to acquire lock: ffff8880732920a0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x267/0x18d0 fs/ext4/inode.c:574 but task is already holding lock: ffff88804f7e2208 (&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_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x9630/0xad90 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1303 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 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_free_space+0x773/0xaf0 fs/quota/dquot.c:1907 dquot_free_space_nodirty include/linux/quotaops.h:379 [inline] dquot_free_space include/linux/quotaops.h:384 [inline] dquot_free_block include/linux/quotaops.h:395 [inline] ext4_mb_clear_bb fs/ext4/mballoc.c:6044 [inline] ext4_free_blocks+0x1132/0x20d0 fs/ext4/mballoc.c:6173 ext4_remove_blocks fs/ext4/extents.c:2545 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2710 [inline] ext4_ext_remove_space+0x1ec4/0x4210 fs/ext4/extents.c:2958 ext4_ext_truncate+0x34b/0x400 fs/ext4/extents.c:4416 ext4_truncate+0xdb5/0x1340 fs/ext4/inode.c:4342 ext4_evict_inode+0xb9f/0x1ca0 fs/ext4/inode.c:286 evict+0x2ed/0x6b0 fs/inode.c:665 iput_final fs/inode.c:1748 [inline] iput.part.0+0x50a/0x740 fs/inode.c:1774 iput+0x5c/0x80 fs/inode.c:1764 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x9630/0xad90 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1303 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 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 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_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x9630/0xad90 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1303 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 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 *** 3 locks held by syz-executor.3/27874: #0: ffff88804f7e20e0 (&type->s_umount_key#28/1){+.+.}-{3:3}, at: alloc_super+0x22e/0xb60 fs/super.c:228 #1: ffff888044c715a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x51/0x6c0 fs/quota/dquot.c:432 #2: ffff88804f7e2208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x8f/0x250 fs/quota/quota_v2.c:354 stack backtrace: CPU: 0 PID: 27874 Comm: syz-executor.3 Not tainted 6.3.0-rc6-syzkaller-00173-g7a934f4bd7d6 #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 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_initialize+0x560/0xbe0 fs/quota/dquot.c:1492 ext4_process_orphan+0x47/0x410 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0x6e5/0x1110 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5509 [inline] ext4_fill_super+0x9630/0xad90 fs/ext4/super.c:5637 get_tree_bdev+0x444/0x760 fs/super.c:1303 vfs_get_tree+0x8d/0x350 fs/super.c:1510 do_new_mount fs/namespace.c:3042 [inline] path_mount+0x1342/0x1e40 fs/namespace.c:3372 do_mount fs/namespace.c:3385 [inline] __do_sys_mount fs/namespace.c:3594 [inline] __se_sys_mount fs/namespace.c:3571 [inline] __ia32_sys_mount+0x282/0x300 fs/namespace.c:3571 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: 0023:0xf7f5f579 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:00000000f7f5a410 EFLAGS: 00000296 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00000000f7f5a480 RCX: 0000000020000500 RDX: 0000000020000040 RSI: 0000000000004500 RDI: 00000000f7f5a4c0 RBP: 00000000f7f5a4c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 EXT4-fs (loop3): 1 orphan inode deleted ext4 filesystem being mounted at /syzkaller-testdir451984562/syzkaller.dAwMeU/1614/file1 supports timestamps until 2038 (0x7fffffff) ---------------- 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