loop4: detected capacity change from 0 to 1024 EXT4-fs (loop4): revision level too high, forcing read-only mode EXT4-fs (loop4): orphan cleanup on readonly fs ====================================================== WARNING: possible circular locking dependency detected 6.1.136-syzkaller #0 Not tainted ------------------------------------------------------ syz.4.99/4918 is trying to acquire lock: ffff888055e234b0 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x316/0x1b60 fs/ext4/inode.c:604 but task is already holding lock: ffff8880770ce208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x12b/0x190 fs/quota/quota_v2.c:357 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+0x42/0x2d0 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4a/0x110 fs/quota/quota_v2.c:335 dquot_acquire+0x152/0x520 fs/quota/dquot.c:463 ext4_acquire_dquot+0x2d9/0x4a0 fs/ext4/super.c:6798 dqget+0x778/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x328/0xcb0 fs/quota/dquot.c:1517 ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5523 [inline] ext4_fill_super+0x7b5e/0x80d0 fs/ext4/super.c:5654 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3057 do_mount fs/namespace.c:3400 [inline] __do_sys_mount fs/namespace.c:3608 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x120/0xaf0 kernel/locking/mutex.c:747 dquot_commit+0x5a/0x410 fs/quota/dquot.c:507 ext4_write_dquot+0x1f0/0x360 fs/ext4/super.c:6778 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0xf9/0x400 fs/quota/dquot.c:412 __dquot_alloc_space+0x5fc/0xe60 fs/quota/dquot.c:1752 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+0xf74/0x4720 fs/ext4/mballoc.c:5727 ext4_ext_map_blocks+0x143c/0x66d0 fs/ext4/extents.c:4339 ext4_map_blocks+0x9d1/0x1b60 fs/ext4/inode.c:679 ext4_iomap_alloc fs/ext4/inode.c:3438 [inline] ext4_iomap_begin+0x7d2/0xae0 fs/ext4/inode.c:3488 iomap_iter+0x6c6/0x1040 fs/iomap/iter.c:91 __iomap_dio_rw+0xcba/0x1dd0 fs/iomap/direct-io.c:601 iomap_dio_rw+0x41/0xa0 fs/iomap/direct-io.c:690 ext4_dio_write_iter fs/ext4/file.c:557 [inline] ext4_file_write_iter+0x1262/0x16e0 fs/ext4/file.c:677 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x62d/0xaf0 fs/read_write.c:861 vfs_writev fs/read_write.c:934 [inline] do_pwritev+0x201/0x340 fs/read_write.c:1031 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #0 (&ei->i_data_sem/2){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x316/0x1b60 fs/ext4/inode.c:604 ext4_getblk+0x1ab/0x6d0 fs/ext4/inode.c:890 ext4_bread+0x26/0x170 fs/ext4/inode.c:946 ext4_quota_write+0x230/0x570 fs/ext4/super.c:7189 write_blk fs/quota/quota_tree.c:70 [inline] get_free_dqblk+0x312/0x660 fs/quota/quota_tree.c:136 do_insert_tree+0x22b/0x1040 fs/quota/quota_tree.c:347 do_insert_tree+0x9eb/0x1040 fs/quota/quota_tree.c:402 do_insert_tree+0x9eb/0x1040 fs/quota/quota_tree.c:402 do_insert_tree+0x9ae/0x1040 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x48d/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:361 dquot_acquire+0x2d5/0x520 fs/quota/dquot.c:472 ext4_acquire_dquot+0x2d9/0x4a0 fs/ext4/super.c:6798 dqget+0x778/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517 ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5523 [inline] ext4_fill_super+0x7b5e/0x80d0 fs/ext4/super.c:5654 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3057 do_mount fs/namespace.c:3400 [inline] __do_sys_mount fs/namespace.c:3608 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 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.4.99/4918: #0: ffff8880770ce0e0 (&type->s_umount_key#27/1){+.+.}-{3:3}, at: alloc_super+0x1fa/0x930 fs/super.c:228 #1: ffff88823bdd80a8 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x63/0x520 fs/quota/dquot.c:460 #2: ffff8880770ce208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x12b/0x190 fs/quota/quota_v2.c:357 stack backtrace: CPU: 0 PID: 4918 Comm: syz.4.99 Not tainted 6.1.136-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/19/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 check_noncircular+0x274/0x310 kernel/locking/lockdep.c:2170 check_prev_add kernel/locking/lockdep.c:3090 [inline] check_prevs_add kernel/locking/lockdep.c:3209 [inline] validate_chain kernel/locking/lockdep.c:3825 [inline] __lock_acquire+0x2cf8/0x7c50 kernel/locking/lockdep.c:5049 lock_acquire+0x1b4/0x490 kernel/locking/lockdep.c:5662 down_read+0x42/0x2d0 kernel/locking/rwsem.c:1520 ext4_map_blocks+0x316/0x1b60 fs/ext4/inode.c:604 ext4_getblk+0x1ab/0x6d0 fs/ext4/inode.c:890 ext4_bread+0x26/0x170 fs/ext4/inode.c:946 ext4_quota_write+0x230/0x570 fs/ext4/super.c:7189 write_blk fs/quota/quota_tree.c:70 [inline] get_free_dqblk+0x312/0x660 fs/quota/quota_tree.c:136 do_insert_tree+0x22b/0x1040 fs/quota/quota_tree.c:347 do_insert_tree+0x9eb/0x1040 fs/quota/quota_tree.c:402 do_insert_tree+0x9eb/0x1040 fs/quota/quota_tree.c:402 do_insert_tree+0x9ae/0x1040 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x48d/0x5b0 fs/quota/quota_tree.c:451 v2_write_dquot+0x108/0x190 fs/quota/quota_v2.c:361 dquot_acquire+0x2d5/0x520 fs/quota/dquot.c:472 ext4_acquire_dquot+0x2d9/0x4a0 fs/ext4/super.c:6798 dqget+0x778/0xeb0 fs/quota/dquot.c:988 __dquot_initialize+0x3b6/0xcb0 fs/quota/dquot.c:1517 ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:329 ext4_orphan_cleanup+0xbd3/0x1400 fs/ext4/orphan.c:474 __ext4_fill_super fs/ext4/super.c:5523 [inline] ext4_fill_super+0x7b5e/0x80d0 fs/ext4/super.c:5654 get_tree_bdev+0x3f1/0x610 fs/super.c:1366 vfs_get_tree+0x88/0x270 fs/super.c:1573 do_new_mount+0x24a/0xa40 fs/namespace.c:3057 do_mount fs/namespace.c:3400 [inline] __do_sys_mount fs/namespace.c:3608 [inline] __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3585 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f133959010a Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f133a436e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f133a436ef0 RCX: 00007f133959010a RDX: 0000200000000140 RSI: 0000200000000300 RDI: 00007f133a436eb0 RBP: 0000200000000140 R08: 00007f133a436ef0 R09: 0000000000008205 R10: 0000000000008205 R11: 0000000000000246 R12: 0000200000000300 R13: 00007f133a436eb0 R14: 0000000000000625 R15: 0000200000000480 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5914: Corrupt filesystem EXT4-fs error (device loop4): ext4_dirty_inode:6118: inode #3: comm syz.4.99: mark_inode_dirty error EXT4-fs error (device loop4): ext4_read_block_bitmap_nowait:477: comm syz.4.99: Invalid block bitmap block 3 in block_group 0 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5914: Corrupt filesystem EXT4-fs error (device loop4): ext4_dirty_inode:6118: inode #3: comm syz.4.99: mark_inode_dirty error __quota_error: 30 callbacks suppressed Quota error (device loop4): write_blk: dquota write failed EXT4-fs error (device loop4): ext4_map_blocks:635: inode #3: block 1: comm syz.4.99: lblock 6 mapped to illegal pblock 1 (length 1) Quota error (device loop4): write_blk: dquota write failed Quota error (device loop4): qtree_write_dquot: Error -28 occurred while creating quota EXT4-fs error (device loop4): ext4_map_blocks:635: inode #3: block 48: comm syz.4.99: lblock 0 mapped to illegal pblock 48 (length 1) Quota error (device loop4): v2_write_file_info: Can't write info structure EXT4-fs error (device loop4): ext4_acquire_dquot:6802: comm syz.4.99: Failed to acquire dquot type 0 EXT4-fs error (device loop4): ext4_map_blocks:635: inode #3: block 49: comm syz.4.99: lblock 1 mapped to illegal pblock 49 (length 1) Quota error (device loop4): do_insert_tree: Can't read tree quota block 1 Quota error (device loop4): qtree_write_dquot: Error -117 occurred while creating quota EXT4-fs error (device loop4): ext4_acquire_dquot:6802: comm syz.4.99: Failed to acquire dquot type 0 EXT4-fs error (device loop4) in ext4_reserve_inode_write:5914: Corrupt filesystem EXT4-fs error (device loop4): ext4_evict_inode:279: inode #15: comm syz.4.99: mark_inode_dirty error EXT4-fs warning (device loop4): ext4_evict_inode:282: couldn't mark inode dirty (err -117) EXT4-fs (loop4): 1 orphan inode deleted EXT4-fs (loop4): mounted filesystem without journal. Quota mode: writeback. EXT4-fs (loop4): warning: mounting unchecked fs, running e2fsck is recommended EXT4-fs error (device loop4): __ext4_remount:6611: comm syz.4.99: Abort forced by user EXT4-fs (loop4): Remounting filesystem read-only EXT4-fs (loop4): re-mounted. Quota mode: writeback.