===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.4/4060 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.4/4060: #0: ffff88800f64e3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff8880481459a8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f5fa950 (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: 4060 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: 0033:0x7fc313fc2427 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:00007ffcbd0c2418 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc313fc2427 RDX: 00007ffcbd0c24f7 RSI: 00007fc31401d019 RDI: 00007ffcbd0c24e0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcbd0c22b0 R10: 00007ffcbd0c2167 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffcbd0c24e0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.4/4060 Modules linked in: CPU: 0 UID: 0 PID: 4060 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:ffff88801e0779a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888015d01b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888015d01f7c RBP: ffff888015d01b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888015d01b80 R13: 0000000000000001 R14: ffffffff85c0dc40 R15: ffff88801b7d2938 FS: 000055555f7d5400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc314042544 CR3: 000000000d865000 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: 0033:0x7fc313fc2427 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:00007ffcbd0c2418 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fc313fc2427 RDX: 00007ffcbd0c24f7 RSI: 00007fc31401d019 RDI: 00007ffcbd0c24e0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffcbd0c22b0 R10: 00007ffcbd0c2167 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffcbd0c24e0 irq event stamp: 203 hardirqs last enabled at (203): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (202): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (196): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (194): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop2: detected capacity change from 0 to 64 FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) audit: type=1400 audit(1768849220.148:11): avc: denied { tracepoint } for pid=4061 comm="syz-executor.6" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 loop1: detected capacity change from 0 to 1304 audit: type=1400 audit(1768849220.253:12): avc: denied { watch_reads } for pid=4080 comm="syz-executor.0" path="/syzkaller-testdir310460810/syzkaller.kDeuRZ/5" dev="sda" ino=15981 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:unlabeled_t:s0 tclass=dir permissive=1 loop3: detected capacity change from 0 to 16383 FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) vfat: Unknown parameter '0x0000000000000000ÿÿÿÿÿÿÿÿ' loop3: detected capacity change from 0 to 16383 vfat: Unknown parameter '0x0000000000000000ÿÿÿÿÿÿÿÿ' loop7: detected capacity change from 0 to 2048 loop0: detected capacity change from 0 to 6 loop6: detected capacity change from 0 to 512 loop2: detected capacity change from 0 to 64 EXT4-fs error (device loop6): __ext4_fill_super:5560: inode #2: comm syz-executor.6: iget: special inode unallocated vfat: Bad value for 'check' FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) EXT4-fs (loop6): get root inode failed EXT4-fs (loop6): mount failed FAT-fs (loop2): error, invalid access to FAT (entry 0x000000f8) FAT-fs (loop2): Filesystem has been set read-only EXT4-fs error (device loop7): ext4_ext_check_inode:528: inode #2: comm syz-executor.7: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs (loop7): get root inode failed loop0: detected capacity change from 0 to 6 vfat: Bad value for 'check' EXT4-fs (loop7): mount failed loop2: detected capacity change from 0 to 264192 loop2: detected capacity change from 0 to 64 FAT-fs (loop2): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop2): error, invalid access to FAT (entry 0x000000f8) FAT-fs (loop2): Filesystem has been set read-only loop6: detected capacity change from 0 to 512 audit: type=1400 audit(1768849228.619:13): avc: denied { watch } for pid=4153 comm="syz-executor.4" path="/proc/4153/task" dev="proc" ino=5889 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=dir permissive=1 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.0'. workqueue: Failed to create a rescuer kthread for wq "ext4-rsv-conversion": -EINTR EXT4-fs: failed to create workqueue EXT4-fs (loop6): mount failed