I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x800000 phys_seg 1 prio class 2 ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.7/284 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.7/284: #0: ffff88800f7603f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b813388 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f764950 (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: 1 UID: 0 PID: 284 Comm: syz-executor.7 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: 0033:0x7f9962d38c27 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:00007fff4d18ca88 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff4d18cb10 RCX: 00007f9962d38c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff4d18cb10 RBP: 00007fff4d18caec R08: 0000000000000000 R09: 0000000000000003 R10: 00007fff4d18c827 R11: 0000000000000206 R12: 0000000000000032 R13: 0000000000025405 R14: 0000000000000009 R15: 00007fff4d18cb50 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.7/284 Modules linked in: CPU: 1 UID: 0 PID: 284 Comm: syz-executor.7 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:ffff88801b3379e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888013d21b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888013d21f7c RBP: ffff888013d21b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888013d21b80 R13: 0000000000000001 R14: ffffffff85c0c700 R15: ffff8880498ae268 FS: 000055557f4c3400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c010f67000 CR3: 000000001ca67000 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: 0033:0x7f9962d38c27 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:00007fff4d18ca88 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff4d18cb10 RCX: 00007f9962d38c27 RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007fff4d18cb10 RBP: 00007fff4d18caec R08: 0000000000000000 R09: 0000000000000003 R10: 00007fff4d18c827 R11: 0000000000000206 R12: 0000000000000032 R13: 0000000000025405 R14: 0000000000000009 R15: 00007fff4d18cb50 irq event stamp: 180309 hardirqs last enabled at (180309): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (180308): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (180304): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (180302): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop3: detected capacity change from 0 to 264192 vfat: Unknown parameter 'iocherset' ext4: Unknown parameter 'syzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallers' proc: Unknown parameter 'g?*ڶid' loop3: detected capacity change from 0 to 264192 ext4: Unknown parameter 'syzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallersyzkallers' proc: Unknown parameter 'g?*ڶid' vfat: Unknown parameter 'iocherset' loop4: detected capacity change from 0 to 4 ext4: Unknown parameter 'd^5 ta' loop4: detected capacity change from 0 to 4 ext4: Unknown parameter 'd^5 ta' loop5: detected capacity change from 0 to 512 loop4: detected capacity change from 0 to 256 journal_path: Non-blockdev passed as './file0' EXT4-fs: error: could not find journal device path EXT4-fs (loop5): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. EXT4-fs (loop5): unmounting filesystem 00000000-0000-0000-0000-000000000000. random: crng reseeded on system resumption Restarting kernel threads ... vfat: Unknown parameter 'iocherset' Done restarting kernel threads. random: crng reseeded on system resumption Restarting kernel threads ... Done restarting kernel threads.