loop1: detected capacity change from 0 to 512 ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260114 #1 Not tainted ------------------------------------- syz-executor.1/5136 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.1/5136: #0: ffff88800f7123f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88804990bd10 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f716950 (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: 5136 Comm: syz-executor.1 Not tainted 6.19.0-rc5-next-20260114 #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 do_mkdirat+0x11a/0x440 __x64_sys_mkdir+0x65/0x80 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8085086c27 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:00007f80825fcfa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f8085086c27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f80825fd040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f80825fd000 R15: 0000000020013c00 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.1/5136 Modules linked in: CPU: 1 UID: 0 PID: 5136 Comm: syz-executor.1 Not tainted 6.19.0-rc5-next-20260114 #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 16 c0 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 24 74 03 e8 bc 5c 56 00 e9 RSP: 0018:ffff88806cf08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff88804a3f3700 RCX: 0000000000000005 RDX: 0000000000000000 RSI: ffffffff85e25d80 RDI: ffff88804a3f3afc RBP: ffff88804a3f3700 R08: ffffffff8189345d R09: ffffffff84e98ac0 R10: 0000000000000000 R11: ffff88806cf08ff8 R12: ffff88804a3f3700 R13: 0000000000000001 R14: ffff88806cf379c0 R15: ffff88806cf37a20 FS: 00007f80825fd700(0000) GS:ffff8880e5443000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3362835018 CR3: 0000000007173000 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:handle_bug+0x209/0x4f0 Code: 83 db ff 0f 1f 44 00 00 90 4c 8b ad 90 00 00 00 31 ff 41 81 e5 00 02 00 00 4c 89 ee 0f 1f 44 00 00 4d 85 ed 0f 85 3d 01 00 00 <0f> 1f 44 00 00 48 63 fb 48 c7 c6 60 2a e2 84 0f 1f 44 00 00 81 fb RSP: 0018:ffff88804c51f8d0 EFLAGS: 00000206 RAX: ffff88804c51f938 RBX: 000000000000fffe RCX: ffffffff810016ca RDX: 0000000000000000 RSI: 0000000000000200 RDI: 0000000000000000 RBP: ffff88804c51f938 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff815d6d6f R13: 0000000000000200 R14: 0000000000000002 R15: 000000000000000b 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 16 c0 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 24 74 03 e8 bc 5c 56 00 e9 RSP: 0018:ffff88804c51f9e0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88804a3f3700 RCX: ffffc900007e5000 RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff88804a3f3afc RBP: ffff88804a3f3700 R08: 0000000000000000 R09: fffffbfff0ba6ffc R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804a3f3700 R13: 0000000000000001 R14: ffffffff85c0fe00 R15: ffff88801bcc58e0 __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_mkdir+0x331/0xb30 vfs_mkdir+0x6d8/0xc00 do_mkdirat+0x11a/0x440 __x64_sys_mkdir+0x65/0x80 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f8085086c27 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:00007f80825fcfa8 EFLAGS: 00000213 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 00007f8085086c27 RDX: 0000000000000003 RSI: 00000000000001ff RDI: 0000000020000100 RBP: 00007f80825fd040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000213 R12: 0000000020000000 R13: 0000000020000100 R14: 00007f80825fd000 R15: 0000000020013c00 irq event stamp: 603 hardirqs last enabled at (603): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (601): [] handle_softirqs+0x65e/0x7d0 softirqs last enabled at (602): [] __irq_exit_rcu+0xc4/0x100 softirqs last disabled at (571): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- EXT4-fs (loop1): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir690539973/syzkaller.cXBJ7Q/51/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop1): unmounting filesystem 00000000-0000-0000-0000-000000000000. ---------------- Code disassembly (best guess): 0: 83 db ff sbb $0xffffffff,%ebx 3: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 8: 90 nop 9: 4c 8b ad 90 00 00 00 mov 0x90(%rbp),%r13 10: 31 ff xor %edi,%edi 12: 41 81 e5 00 02 00 00 and $0x200,%r13d 19: 4c 89 ee mov %r13,%rsi 1c: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 21: 4d 85 ed test %r13,%r13 24: 0f 85 3d 01 00 00 jne 0x167 * 2a: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) <-- trapping instruction 2f: 48 63 fb movslq %ebx,%rdi 32: 48 c7 c6 60 2a e2 84 mov $0xffffffff84e22a60,%rsi 39: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 3e: 81 .byte 0x81 3f: fb sti