EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260115 #1 Not tainted ------------------------------------- syz-executor.3/5606 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.3/5606: #0: ffff88800f9c23f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff888009580d68 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f9c6950 (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: 5606 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260115 #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_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1a7f6c8427 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 58 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:00007ffd1ca1fa58 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1a7f6c8427 RDX: ffffffffffffffbc RSI: 00007f1a7f72300e RDI: 00007f1a7f7221dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd1ca1f4d0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd1ca1fb20 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.3/5606 Modules linked in: CPU: 1 UID: 0 PID: 5606 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260115 #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:ffff88804a4979a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801af55280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801af5567c RBP: ffff88801af55280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801af55280 R13: 0000000000000001 R14: ffffffff85c0cca0 R15: ffff888020cc45d0 FS: 000055557751f400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b05579544 CR3: 000000000d87f000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1a7f6c8427 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 58 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:00007ffd1ca1fa58 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1a7f6c8427 RDX: ffffffffffffffbc RSI: 00007f1a7f72300e RDI: 00007f1a7f7221dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd1ca1f4d0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd1ca1fb20 irq event stamp: 605 hardirqs last enabled at (605): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (604): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (600): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (598): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop4: detected capacity change from 0 to 512 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:823 at rcu_sched_clock_irq+0x1431/0x2e50, CPU#1: syz-executor.3/5606 Modules linked in: CPU: 1 UID: 0 PID: 5606 Comm: syz-executor.3 Tainted: G W 6.19.0-rc5-next-20260115 #1 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:rcu_sched_clock_irq+0x1431/0x2e50 Code: d1 f4 ff ff e8 90 dd 55 00 e9 12 f2 ff ff 48 c7 c7 b4 f3 66 86 e8 df dd 55 00 e9 07 ef ff ff e8 95 a2 c2 ff e9 1e f6 ff ff 90 <0f> 0b 90 e9 fa ee ff ff f3 48 0f bc c0 89 c3 83 f8 3f 0f 86 a3 fa RSP: 0018:ffff88806cf08b68 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: 0000000000000000 RCX: ffffffff815ddf6f RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88801af5567c RBP: ffff88801af55280 R08: 0000000000000000 R09: fffffbfff0ccdd2a R10: ffffffff8666e957 R11: ffff88806cf08ff8 R12: ffff88801af55280 R13: 0000000000000000 R14: ffffffff8666f3b4 R15: dffffc0000000000 FS: 000055557751f400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7b05579544 CR3: 000000000d87f000 CR4: 0000000000350ef0 Call Trace: update_process_times+0xf2/0x210 tick_nohz_handler+0x4ff/0x8c0 __hrtimer_run_queues+0x654/0xbb0 hrtimer_interrupt+0x369/0x830 __sysvec_apic_timer_interrupt+0xbb/0x300 sysvec_apic_timer_interrupt+0x6b/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 RIP: 0010:schedule+0x17/0x390 Code: 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 c7 c0 b4 f3 66 86 41 55 48 ba 00 00 00 00 00 fc ff df <48> 89 c1 41 54 83 e0 07 48 c1 e9 03 55 83 c0 03 53 0f b6 14 11 65 RSP: 0018:ffff88804a4979c0 EFLAGS: 00000246 RAX: ffffffff8666f3b4 RBX: 0000000000000001 RCX: ffffffff81532d93 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffffff85c16880 RBP: ffff88804a497a08 R08: 0000000000000000 R09: fffffbfff0b82d10 R10: ffffffff85c16883 R11: 0000000000000001 R12: 1ffff11009492f3a R13: 0000000000000001 R14: ffffffff85c0cca0 R15: ffff888020cc45d0 __wait_on_freeing_inode+0x2e7/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 vfs_symlink+0x44b/0x840 filename_symlinkat+0x158/0x440 __x64_sys_symlink+0x82/0x110 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1a7f6c8427 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 58 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:00007ffd1ca1fa58 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1a7f6c8427 RDX: ffffffffffffffbc RSI: 00007f1a7f72300e RDI: 00007f1a7f7221dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffd1ca1f4d0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffd1ca1fb20 irq event stamp: 605 hardirqs last enabled at (605): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (604): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (600): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (598): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- 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 loop3: detected capacity change from 0 to 512 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 00 90 90 90 90 90 add %dl,-0x6f6f6f70(%rax) 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: f3 0f 1e fa endbr64 17: 48 c7 c0 b4 f3 66 86 mov $0xffffffff8666f3b4,%rax 1e: 41 55 push %r13 20: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 27: fc ff df * 2a: 48 89 c1 mov %rax,%rcx <-- trapping instruction 2d: 41 54 push %r12 2f: 83 e0 07 and $0x7,%eax 32: 48 c1 e9 03 shr $0x3,%rcx 36: 55 push %rbp 37: 83 c0 03 add $0x3,%eax 3a: 53 push %rbx 3b: 0f b6 14 11 movzbl (%rcx,%rdx,1),%edx 3f: 65 gs