EXT4-fs error (device loop1): __ext4_fill_super:5560: inode #2: comm syz-executor.1: iget: special inode unallocated EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.4/284 is trying to release lock (rcu_read_lock) at: [] __wait_on_freeing_inode+0x105/0x350 but there are no more locks to release! other info that might help us debug this: 4 locks held by syz-executor.4/284: #0: ffff88800f6323f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff888017b7c698 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f636950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0xe32/0x12d0 #3: ffffffff85c16898 (inode_hash_lock){+.+.}-{3:3}, at: insert_inode_locked+0xf9/0x890 stack backtrace: CPU: 0 UID: 0 PID: 284 Comm: syz-executor.4 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 print_unlock_imbalance_bug+0x118/0x130 lock_release+0x1ee/0x270 __wait_on_freeing_inode+0x10a/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc7bf134c27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2e1ae938 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff2e1ae9c0 RCX: 00007fc7bf134c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff2e1ae9c0 RBP: 00007fff2e1ae99c R08: 0000000000000000 R09: 0000000000000004 R10: 00007fff2e1ae6d6 R11: 0000000000000202 R12: 0000000000000032 R13: 00000000000692ee R14: 0000000000000001 R15: 00007fff2e1aea00 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.4/284 Modules linked in: CPU: 0 UID: 0 PID: 284 Comm: syz-executor.4 Not tainted 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:__rcu_read_unlock+0x25f/0x5c0 Code: f2 02 00 00 c7 43 58 01 00 00 00 bf 09 00 00 00 e8 d6 b7 de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 8a 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 81 4d 74 03 e8 2c 5d 56 00 e9 RSP: 0018:ffff88801748f9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff8880166a9b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff8880166a9f7c RBP: ffff8880166a9b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880166a9b80 R13: 0000000000000001 R14: ffffffff85c0fcc0 R15: ffff88801f9e3c48 FS: 00005555614a4400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cc28000 CR3: 000000000d797000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 filename_mkdirat+0x118/0x430 __x64_sys_mkdir+0x6e/0xd0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc7bf134c27 Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2e1ae938 EFLAGS: 00000202 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff2e1ae9c0 RCX: 00007fc7bf134c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff2e1ae9c0 RBP: 00007fff2e1ae99c R08: 0000000000000000 R09: 0000000000000004 R10: 00007fff2e1ae6d6 R11: 0000000000000202 R12: 0000000000000032 R13: 00000000000692ee R14: 0000000000000001 R15: 00007fff2e1aea00 irq event stamp: 465899 hardirqs last enabled at (465899): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (465898): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (465892): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (465890): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop5: detected capacity change from 0 to 272 EXT4-fs (loop5): bad geometry: block count 128 exceeds size of device (68 blocks) loop1: detected capacity change from 0 to 512 loop7: detected capacity change from 0 to 512 loop5: detected capacity change from 0 to 272 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 loop4: detected capacity change from 0 to 512 EXT4-fs error (device loop1): __ext4_fill_super:5560: inode #2: comm syz-executor.1: iget: special inode unallocated CPU: 1 UID: 0 PID: 5672 Comm: syz-executor.2 Tainted: G W 6.19.0-rc5-next-20260116 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 __kmalloc_cache_noprof+0x80/0x730 bdi_split_work_to_wbs+0x2ba/0xce0 sync_inodes_sb+0x1cc/0xb90 sync_inodes_one_sb+0x51/0x60 __iterate_supers+0x21a/0x380 ksys_sync+0x87/0xf0 __do_sys_sync+0xe/0x20 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5568911b19 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5565e87188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f5568a24f60 RCX: 00007f5568911b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f5565e871d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffcc776aa3f R14: 00007f5565e87300 R15: 0000000000022000 EXT4-fs error (device loop7): __ext4_fill_super:5560: inode #2: comm syz-executor.7: iget: special inode unallocated EXT4-fs (loop1): get root inode failed EXT4-fs (loop1): mount failed EXT4-fs (loop7): get root inode failed EXT4-fs (loop7): mount failed EXT4-fs (loop5): bad geometry: block count 128 exceeds size of device (68 blocks) EXT4-fs error (device loop4): __ext4_fill_super:5560: inode #2: comm syz-executor.4: iget: special inode unallocated EXT4-fs (loop4): get root inode failed EXT4-fs (loop4): mount failed