loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): VFS: Can't find ext4 filesystem ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.6/283 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.6/283: #0: ffff88800fac63f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801c0d3388 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fab2950 (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: 283 Comm: syz-executor.6 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: 0033:0x7f510ed74c27 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:00007ffffe7413b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffffe741440 RCX: 00007f510ed74c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffffe741440 RBP: 00007ffffe74141c R08: 0000000000000000 R09: 0000000000000004 R10: 00007ffffe741156 R11: 0000000000000206 R12: 0000000000000032 R13: 000000000003c159 R14: 0000000000000010 R15: 00007ffffe741480 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.6/283 Modules linked in: CPU: 0 UID: 0 PID: 283 Comm: syz-executor.6 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:ffff8880166bf9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88800f688000 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88800f6883fc RBP: ffff88800f688000 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800f688000 R13: 0000000000000001 R14: ffffffff85c0c700 R15: ffff888049942938 FS: 000055555ece3400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000557d6a312180 CR3: 000000000f1ad000 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: 0033:0x7f510ed74c27 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:00007ffffe7413b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffffe741440 RCX: 00007f510ed74c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffffe741440 RBP: 00007ffffe74141c R08: 0000000000000000 R09: 0000000000000004 R10: 00007ffffe741156 R11: 0000000000000206 R12: 0000000000000032 R13: 000000000003c159 R14: 0000000000000010 R15: 00007ffffe741480 irq event stamp: 263727 hardirqs last enabled at (263727): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (263726): [] sysvec_call_function_single+0x18/0xc0 softirqs last enabled at (263720): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (263718): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- EXT4-fs (loop1): bad geometry: block count 128 exceeds size of device (1 blocks) loop2: detected capacity change from 0 to 512 EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop1: detected capacity change from 0 to 5 EXT4-fs (loop1): bad geometry: block count 128 exceeds size of device (1 blocks) loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): VFS: Can't find ext4 filesystem process 'syz-executor.4' launched './file1' with NULL argv: empty string added loop0: detected capacity change from 0 to 6 FAT-fs (loop0): Directory bread(block 6) failed loop0: detected capacity change from 0 to 6 FAT-fs (loop0): Directory bread(block 6) failed loop1: detected capacity change from 0 to 5 loop7: detected capacity change from 0 to 512 EXT4-fs (loop1): bad geometry: block count 128 exceeds size of device (1 blocks) EXT4-fs (loop7): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs error (device loop7): __ext4_get_inode_loc:4828: comm syz-executor.7: Invalid inode table block 0 in block_group 0 EXT4-fs (loop7): get root inode failed EXT4-fs (loop7): mount failed No source specified loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs error (device loop7): __ext4_get_inode_loc:4828: comm syz-executor.7: Invalid inode table block 0 in block_group 0 EXT4-fs (loop7): get root inode failed EXT4-fs (loop7): mount failed No source specified loop2: detected capacity change from 0 to 512 EXT4-fs (loop2): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop2): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock EXT4-fs (loop2): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs error (device loop2): __ext4_get_inode_loc:4828: comm syz-executor.2: Invalid inode table block 0 in block_group 0 EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed loop7: detected capacity change from 0 to 512 EXT4-fs (loop7): ext4_check_descriptors: Block bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode bitmap for group 0 overlaps superblock EXT4-fs (loop7): ext4_check_descriptors: Inode table for group 0 overlaps superblock EXT4-fs error (device loop7): __ext4_get_inode_loc:4828: comm syz-executor.7: Invalid inode table block 0 in block_group 0 EXT4-fs (loop7): get root inode failed EXT4-fs (loop7): mount failed loop5: detected capacity change from 0 to 32640 FAT-fs (loop5): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)