EXT4-fs error (device loop1): ext4_orphan_get:1404: comm syz.1.1847: couldn't read orphan inode 11 (err -117) EXT4-fs (loop1): mounted filesystem without journal. Quota mode: writeback. ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.1847/9712 is trying to acquire lock: ffff0000f52a1698 (&ei->i_data_sem/2){++++}-{3:3}, at: ext4_map_blocks+0x7c4/0x1778 fs/ext4/inode.c:672 but task is already holding lock: ffff0000f7706208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x114/0x180 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+0x64/0x300 kernel/locking/rwsem.c:1520 v2_read_dquot+0x4c/0x118 fs/quota/quota_v2.c:335 dquot_acquire+0x120/0x4d8 fs/quota/dquot.c:463 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6831 dqget+0x654/0xcc4 fs/quota/dquot.c:988 __dquot_initialize+0x2fc/0xacc fs/quota/dquot.c:1517 dquot_initialize+0x24/0x34 fs/quota/dquot.c:1579 ext4_process_orphan+0x5c/0x2b4 fs/ext4/orphan.c:327 ext4_orphan_cleanup+0x920/0x1060 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x6188/0x660c fs/ext4/super.c:5687 get_tree_bdev+0x358/0x544 fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5717 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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+0x190/0x1f60 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+0x50/0x1c4 fs/quota/dquot.c:507 ext4_write_dquot+0x1b4/0x31c fs/ext4/super.c:6811 ext4_mark_dquot_dirty+0xe8/0x140 fs/ext4/super.c:6888 mark_dquot_dirty fs/quota/dquot.c:372 [inline] mark_all_dquot_dirty+0x108/0x424 fs/quota/dquot.c:412 __dquot_free_space+0x73c/0xa78 fs/quota/dquot.c:1942 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:6153 [inline] ext4_free_blocks+0x1888/0x2390 fs/ext4/mballoc.c:6283 ext4_remove_blocks fs/ext4/extents.c:2537 [inline] ext4_ext_rm_leaf fs/ext4/extents.c:2703 [inline] ext4_ext_remove_space+0x1878/0x3ac4 fs/ext4/extents.c:2951 ext4_ext_truncate+0x134/0x1d0 fs/ext4/extents.c:4527 ext4_truncate+0x9f4/0x1084 fs/ext4/inode.c:4291 ext4_process_orphan+0x17c/0x2b4 fs/ext4/orphan.c:337 ext4_orphan_cleanup+0x920/0x1060 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5556 [inline] ext4_fill_super+0x6188/0x660c fs/ext4/super.c:5687 get_tree_bdev+0x358/0x544 fs/super.c:1366 ext4_get_tree+0x28/0x38 fs/ext4/super.c:5717 vfs_get_tree+0x90/0x274 fs/super.c:1573 do_new_mount+0x228/0x810 fs/namespace.c:3078 path_mount+0x5bc/0xe80 fs/namespace.c:3408 do_mount fs/namespace.c:3421 [inline] __do_sys_mount fs/namespace.c:3629 [inline] __se_sys_mount fs/namespace.c:3606 [inline] __arm64_sys_mount+0x49c/0x59c fs/namespace.c:3606 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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/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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x7c4/0x1778 fs/ext4/inode.c:672 ext4_getblk+0x178/0x664 fs/ext4/inode.c:890 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:946 ext4_quota_write+0x204/0x534 fs/ext4/super.c:7222 write_blk fs/quota/quota_tree.c:70 [inline] find_free_dqentry+0x548/0xa68 fs/quota/quota_tree.c:318 do_insert_tree+0x574/0xc34 fs/quota/quota_tree.c:400 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3d4/0x4f0 fs/quota/quota_tree.c:451 v2_write_dquot+0xf0/0x180 fs/quota/quota_v2.c:361 dquot_acquire+0x2a8/0x4d8 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6831 dqget+0x654/0xcc4 fs/quota/dquot.c:988 dquot_set_dqblk+0x40/0xe28 fs/quota/dquot.c:2833 quota_setquota+0x41c/0x4cc fs/quota/quota.c:310 do_quotactl+0x65c/0x738 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:960 [inline] __se_sys_quotactl fs/quota/quota.c:916 [inline] __arm64_sys_quotactl+0x2cc/0x77c fs/quota/quota.c:916 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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/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.1.1847/9712: #0: ffff0000f77060e0 (&type->s_umount_key#30){++++}-{3:3}, at: user_get_super+0x118/0x234 fs/super.c:889 #1: ffff0000f5122968 (&dquot->dq_lock){+.+.}-{3:3}, at: dquot_acquire+0x60/0x4d8 fs/quota/dquot.c:460 #2: ffff0000f7706208 (&s->s_dquot.dqio_sem){++++}-{3:3}, at: v2_write_dquot+0x114/0x180 fs/quota/quota_v2.c:357 stack backtrace: CPU: 1 PID: 9712 Comm: syz.1.1847 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 Call trace: dump_backtrace+0x1c0/0x1ec arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf4/0x15c lib/dump_stack.c:106 dump_stack+0x1c/0x5c lib/dump_stack.c:113 print_circular_bug+0x148/0x1b0 kernel/locking/lockdep.c:2048 check_noncircular+0x264/0x2f8 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+0x2880/0x6800 kernel/locking/lockdep.c:5049 lock_acquire+0x20c/0x63c kernel/locking/lockdep.c:5662 down_write+0x5c/0x88 kernel/locking/rwsem.c:1573 ext4_map_blocks+0x7c4/0x1778 fs/ext4/inode.c:672 ext4_getblk+0x178/0x664 fs/ext4/inode.c:890 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:946 ext4_quota_write+0x204/0x534 fs/ext4/super.c:7222 write_blk fs/quota/quota_tree.c:70 [inline] find_free_dqentry+0x548/0xa68 fs/quota/quota_tree.c:318 do_insert_tree+0x574/0xc34 fs/quota/quota_tree.c:400 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 do_insert_tree+0x790/0xc34 fs/quota/quota_tree.c:402 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3d4/0x4f0 fs/quota/quota_tree.c:451 v2_write_dquot+0xf0/0x180 fs/quota/quota_v2.c:361 dquot_acquire+0x2a8/0x4d8 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6831 dqget+0x654/0xcc4 fs/quota/dquot.c:988 dquot_set_dqblk+0x40/0xe28 fs/quota/dquot.c:2833 quota_setquota+0x41c/0x4cc fs/quota/quota.c:310 do_quotactl+0x65c/0x738 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:960 [inline] __se_sys_quotactl fs/quota/quota.c:916 [inline] __arm64_sys_quotactl+0x2cc/0x77c fs/quota/quota.c:916 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 EXT4-fs error (device loop1): ext4_read_block_bitmap_nowait:477: comm syz.1.1847: Invalid block bitmap block 0 in block_group 0 Unable to handle kernel paging request at virtual address ffffffffffffff93 KASAN: maybe wild-memory-access in range [0x0003fffffffffc98-0x0003fffffffffc9f] Mem abort info: ESR = 0x0000000096000004 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault Data abort info: ISV = 0, ISS = 0x00000004 CM = 0, WnR = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=000000020dfcc000 [ffffffffffffff93] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 0000000096000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 9712 Comm: syz.1.1847 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/26/2026 pstate: 62400005 (nZCv daif +PAN -UAO +TCO -DIT -SSBS BTYPE=--) pc : ext4_ext_drop_refs fs/ext4/extents.c:119 [inline] pc : ext4_free_ext_path fs/ext4/extents.c:128 [inline] pc : ext4_ext_map_blocks+0x2a70/0x570c fs/ext4/extents.c:4497 lr : ext4_ext_map_blocks+0x1654/0x570c fs/ext4/extents.c:4427 sp : ffff8000214e6ea0 x29: ffff8000214e7120 x28: dfff800000000000 x27: 0000000000000001 x26: ffff8000214e7360 x25: 0000000000000001 x24: 0000000000000001 x23: 0000000000000001 x22: ffff0000f52a16c0 x21: 0000000000000001 x20: ffff8000214e7360 x19: ffffffffffffff8b x18: ffff800011b9bf60 x17: 1fffe00033eaa57e x16: ffff80000804309c x15: ffff800008b8089c x14: 0000000000000001 x13: 1ffff00002b4e732 x12: 0000000000080000 x11: 000000000007ffff x10: ffff800025c2a000 x9 : ffff800008d259ac x8 : 0000000000000000 x7 : ffff80000805983c x6 : ffff800008059a4c x5 : ffff0000c3718778 x4 : ffff8000214e69a0 x3 : 0000000000000000 x2 : ffff8000214e6a00 x1 : 0000000000000000 x0 : ffffffffffffff93 Call trace: ext4_ext_drop_refs fs/ext4/extents.c:119 [inline] ext4_free_ext_path fs/ext4/extents.c:128 [inline] ext4_ext_map_blocks+0x2a70/0x570c fs/ext4/extents.c:4497 ext4_map_blocks+0x860/0x1778 fs/ext4/inode.c:679 ext4_getblk+0x178/0x664 fs/ext4/inode.c:890 ext4_bread+0x3c/0x1a8 fs/ext4/inode.c:946 ext4_quota_write+0x204/0x534 fs/ext4/super.c:7222 write_blk+0xf8/0x204 fs/quota/quota_tree.c:70 do_insert_tree+0x80c/0xc34 fs/quota/quota_tree.c:407 dq_insert_tree fs/quota/quota_tree.c:432 [inline] qtree_write_dquot+0x3d4/0x4f0 fs/quota/quota_tree.c:451 v2_write_dquot+0xf0/0x180 fs/quota/quota_v2.c:361 dquot_acquire+0x2a8/0x4d8 fs/quota/dquot.c:472 ext4_acquire_dquot+0x270/0x428 fs/ext4/super.c:6831 dqget+0x654/0xcc4 fs/quota/dquot.c:988 dquot_set_dqblk+0x40/0xe28 fs/quota/dquot.c:2833 quota_setquota+0x41c/0x4cc fs/quota/quota.c:310 do_quotactl+0x65c/0x738 fs/quota/quota.c:802 __do_sys_quotactl fs/quota/quota.c:960 [inline] __se_sys_quotactl fs/quota/quota.c:916 [inline] __arm64_sys_quotactl+0x2cc/0x77c fs/quota/quota.c:916 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b4 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x58/0x130 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x128 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 Code: 2a1803fb d343fc08 38fc6908 35006ba8 (79401276) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 2a1803fb mov w27, w24 4: d343fc08 lsr x8, x0, #3 8: 38fc6908 ldrsb w8, [x8, x28] c: 35006ba8 cbnz w8, 0xd80 * 10: 79401276 ldrh w22, [x19, #8] <-- trapping instruction