EXT4-fs (loop2): mount failed ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.4/8857 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.4/8857: #0: ffff88800fa3c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b3b3d10 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f518950 (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: 8857 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_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: 0033:0x7fbee2a9d427 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:00007ffea591cfd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbee2a9d427 RDX: ffffffffffffffbc RSI: 00007fbee2af800e RDI: 00007fbee2af71dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffea591ca50 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffea591d0a0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.4/8857 Modules linked in: CPU: 1 UID: 0 PID: 8857 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:ffff88806cf08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff88804ceed280 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffffffff85e25fc0 RDI: ffff88804ceed67c RBP: ffff88804ceed280 R08: ffffffff81893b1d R09: ffffffff84e98ac0 R10: 0000000000000000 R11: 00000000000002d3 R12: ffff88804ceed280 R13: 0000000000000001 R14: ffff88806cf379c0 R15: ffff88806cf37a20 FS: 000055558659e400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558659e708 CR3: 000000003430b000 CR4: 0000000000350ef0 Call Trace: sched_tick+0x232/0x6e0 update_process_times+0x116/0x210 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:__report_bug+0x4dd/0x5b0 Code: d0 7c 08 84 d2 0f 85 b0 00 00 00 48 63 2b 4c 89 e7 48 01 dd 48 89 ee e8 11 31 b0 fc 49 39 ec 74 22 e8 77 36 b0 fc 48 83 c3 10 <48> 81 fb 20 8b 6c 86 72 b2 e8 65 36 b0 fc 4c 89 e7 e8 9d f7 ff ff RSP: 0018:ffff88804d71f750 EFLAGS: 00000286 RAX: 0000000000000000 RBX: ffffffff8667bb60 RCX: ffffffff84c54bdf RDX: ffff88804ceed280 RSI: ffffffff84c54be9 RDI: 0000000000000006 RBP: ffffffff813e5fa0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff813e5fa0 R11: 0000000000000000 R12: ffffffff815d742f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b report_bug+0x7c/0x120 handle_bug+0x2e8/0x4f0 exc_invalid_op+0x35/0x80 asm_exc_invalid_op+0x1a/0x20 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:ffff88804d71f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88804ceed280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88804ceed67c RBP: ffff88804ceed280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804ceed280 R13: 0000000000000001 R14: ffffffff85c0dab0 R15: ffff88801b161fb0 __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: 0033:0x7fbee2a9d427 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:00007ffea591cfd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbee2a9d427 RDX: ffffffffffffffbc RSI: 00007fbee2af800e RDI: 00007fbee2af71dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffea591ca50 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffea591d0a0 irq event stamp: 1525 hardirqs last enabled at (1525): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (1524): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (1520): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (1518): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop2: detected capacity change from 0 to 2048 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 rfkill: input handler disabled rfkill: input handler enabled rfkill: input handler disabled rfkill: input handler enabled loop2: detected capacity change from 0 to 2048 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 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 9128 Comm: syz-executor.1 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 kmem_cache_alloc_noprof+0x80/0x760 alloc_empty_file+0x58/0x1e0 path_openat+0xee/0x2d60 do_file_open_root+0x2f9/0x5d0 file_open_root+0x2e4/0x470 do_handle_open+0x380/0xd10 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9b43cd8b19 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:00007f9b4124e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000130 RAX: ffffffffffffffda RBX: 00007f9b43debf60 RCX: 00007f9b43cd8b19 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007f9b4124e1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffd4dd3416f R14: 00007f9b4124e300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: d0 7c 08 84 sarb -0x7c(%rax,%rcx,1) 4: d2 0f rorb %cl,(%rdi) 6: 85 b0 00 00 00 48 test %esi,0x48000000(%rax) c: 63 2b movslq (%rbx),%ebp e: 4c 89 e7 mov %r12,%rdi 11: 48 01 dd add %rbx,%rbp 14: 48 89 ee mov %rbp,%rsi 17: e8 11 31 b0 fc callq 0xfcb0312d 1c: 49 39 ec cmp %rbp,%r12 1f: 74 22 je 0x43 21: e8 77 36 b0 fc callq 0xfcb0369d 26: 48 83 c3 10 add $0x10,%rbx * 2a: 48 81 fb 20 8b 6c 86 cmp $0xffffffff866c8b20,%rbx <-- trapping instruction 31: 72 b2 jb 0xffffffe5 33: e8 65 36 b0 fc callq 0xfcb0369d 38: 4c 89 e7 mov %r12,%rdi 3b: e8 9d f7 ff ff callq 0xfffff7dd