EXT4-fs (loop2): mounted filesystem without journal. Quota mode: writeback. ext4 filesystem being mounted at /340/file0 supports timestamps until 2038-01-19 (0x7fffffff) ====================================================== WARNING: possible circular locking dependency detected 6.1.119-syzkaller #0 Not tainted ------------------------------------------------------ syz.2.1614/9207 is trying to acquire lock: ffff0000f4f59698 (&ei->i_data_sem/1){+.+.}-{3:3}, at: ext4_double_down_write_data_sem+0x3c/0x4c but task is already holding lock: ffff0000f4f58288 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x30/0x4c which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&ei->i_data_sem/2){++++}-{3:3}: down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x77c/0x1810 fs/ext4/inode.c:671 ext4_getblk+0x198/0x6ec fs/ext4/inode.c:889 ext4_bread+0x3c/0x1b0 fs/ext4/inode.c:945 ext4_quota_write+0x230/0x54c fs/ext4/super.c:7171 write_blk fs/quota/quota_tree.c:70 [inline] find_free_dqentry+0x550/0xa5c fs/quota/quota_tree.c:318 do_insert_tree+0x600/0xec4 fs/quota/quota_tree.c:400 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 do_insert_tree+0x7fc/0xec4 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3c8/0x4d8 fs/quota/quota_tree.c:451 v2_write_dquot+0xf4/0x188 fs/quota/quota_v2.c:361 dquot_acquire+0x2c4/0x5c4 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6797 dqget+0x660/0xcec fs/quota/dquot.c:986 __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1515 dquot_initialize fs/quota/dquot.c:1577 [inline] dquot_file_open+0x90/0xc8 fs/quota/dquot.c:2226 ext4_file_open+0x200/0x540 fs/ext4/file.c:872 do_dentry_open+0x734/0xfa0 fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1013 do_open fs/namei.c:3626 [inline] path_openat+0x1e14/0x2548 fs/namei.c:3783 do_filp_open+0x1bc/0x3cc fs/namei.c:3810 do_sys_openat2+0x128/0x3e0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #2 (&s->s_dquot.dqio_sem){++++}-{3:3}: down_read+0x64/0x308 kernel/locking/rwsem.c:1520 v2_read_dquot+0x50/0x11c fs/quota/quota_v2.c:335 dquot_acquire+0x130/0x5c4 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x420 fs/ext4/super.c:6797 dqget+0x660/0xcec fs/quota/dquot.c:986 __dquot_initialize+0x2c8/0xc04 fs/quota/dquot.c:1515 dquot_initialize fs/quota/dquot.c:1577 [inline] dquot_file_open+0x90/0xc8 fs/quota/dquot.c:2226 ext4_file_open+0x200/0x540 fs/ext4/file.c:872 do_dentry_open+0x734/0xfa0 fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1013 do_open fs/namei.c:3626 [inline] path_openat+0x1e14/0x2548 fs/namei.c:3783 do_filp_open+0x1bc/0x3cc fs/namei.c:3810 do_sys_openat2+0x128/0x3e0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #1 (&dquot->dq_lock){+.+.}-{3:3}: __mutex_lock_common+0x190/0x21a0 kernel/locking/mutex.c:603 __mutex_lock kernel/locking/mutex.c:747 [inline] mutex_lock_nested+0x38/0x44 kernel/locking/mutex.c:799 dquot_commit+0x54/0x240 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x314 fs/ext4/super.c:6777 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6837 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_alloc_space+0xb28/0xf50 fs/quota/dquot.c:1750 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+0xe8c/0x4680 fs/ext4/mballoc.c:5727 ext4_new_meta_blocks+0x1ac/0x430 fs/ext4/balloc.c:739 ext4_ext_grow_indepth fs/ext4/extents.c:1331 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1437 [inline] ext4_ext_insert_extent+0xb30/0x47b4 fs/ext4/extents.c:2105 ext4_split_extent_at+0x694/0xea4 fs/ext4/extents.c:3235 ext4_force_split_extent_at fs/ext4/extents.c:338 [inline] ext4_swap_extents+0xe60/0x1a34 fs/ext4/extents.c:5770 move_extent_per_page+0x17f0/0x2b48 fs/ext4/move_extent.c:367 ext4_move_extents+0x770/0xb28 fs/ext4/move_extent.c:678 __ext4_ioctl fs/ext4/ioctl.c:1358 [inline] ext4_ioctl+0x3ee0/0x6afc fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 -> #0 (&ei->i_data_sem/1){+.+.}-{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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem+0x3c/0x4c ext4_move_extents+0x2ac/0xb28 fs/ext4/move_extent.c:615 __ext4_ioctl fs/ext4/ioctl.c:1358 [inline] ext4_ioctl+0x3ee0/0x6afc fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 other info that might help us debug this: Chain exists of: &ei->i_data_sem/1 --> &s->s_dquot.dqio_sem --> &ei->i_data_sem/2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&ei->i_data_sem/2); lock(&s->s_dquot.dqio_sem); lock(&ei->i_data_sem/2); lock(&ei->i_data_sem/1); *** DEADLOCK *** 4 locks held by syz.2.1614/9207: #0: ffff0000d7b60460 (sb_writers#3){.+.+}-{0:0}, at: mnt_want_write_file+0x64/0x1e8 fs/namespace.c:437 #1: ffff0000f4f58400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline] #1: ffff0000f4f58400 (&sb->s_type->i_mutex_key#9){++++}-{3:3}, at: lock_two_nondirectories+0xd4/0x120 fs/inode.c:1204 #2: ffff0000f4f59810 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:793 [inline] #2: ffff0000f4f59810 (&sb->s_type->i_mutex_key#9/4){+.+.}-{3:3}, at: lock_two_nondirectories+0xc4/0x120 fs/inode.c:1206 #3: ffff0000f4f58288 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_double_down_write_data_sem+0x30/0x4c stack backtrace: CPU: 1 PID: 9207 Comm: syz.2.1614 Not tainted 6.1.119-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 print_circular_bug+0x150/0x1b8 kernel/locking/lockdep.c:2048 check_noncircular+0x2cc/0x378 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+0x3338/0x7680 kernel/locking/lockdep.c:5049 lock_acquire+0x26c/0x7cc kernel/locking/lockdep.c:5662 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1689 ext4_double_down_write_data_sem+0x3c/0x4c ext4_move_extents+0x2ac/0xb28 fs/ext4/move_extent.c:615 __ext4_ioctl fs/ext4/ioctl.c:1358 [inline] ext4_ioctl+0x3ee0/0x6afc fs/ext4/ioctl.c:1614 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:856 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585