===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260115 #1 Not tainted ------------------------------------- syz-executor.6/10176 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.6/10176: #0: ffff88800f7623f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff8880496d4698 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f766950 (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: 10176 Comm: syz-executor.6 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: 0033:0x7fbb13b03427 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:00007ffca65c7088 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbb13b03427 RDX: 00007ffca65c7163 RSI: 00007fbb13b5e022 RDI: 00007ffca65c7150 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffca65c6f20 R10: 00007ffca65c6dd7 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffca65c7150 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.6/10176 Modules linked in: CPU: 1 UID: 0 PID: 10176 Comm: syz-executor.6 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:ffff88804d0779a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88804a541b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88804a541f7c RBP: ffff88804a541b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88804a541b80 R13: 0000000000000001 R14: ffffffff85c0f220 R15: ffff8880496d3c48 FS: 000055556bd7c400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005635b387dfd8 CR3: 000000004e062000 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: 0033:0x7fbb13b03427 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:00007ffca65c7088 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fbb13b03427 RDX: 00007ffca65c7163 RSI: 00007fbb13b5e022 RDI: 00007ffca65c7150 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffca65c6f20 R10: 00007ffca65c6dd7 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffca65c7150 irq event stamp: 825 hardirqs last enabled at (825): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (824): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (820): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (818): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop6: detected capacity change from 0 to 64 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 2048 EXT4-fs (loop5): unsupported descriptor size 0 loop2: detected capacity change from 0 to 2048 EXT4-fs (loop2): stripe (8) is not aligned with cluster size (16), stripe is disabled EXT4-fs warning (device loop2): read_mmp_block:110: Error -117 while reading MMP block 0 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop6: detected capacity change from 0 to 64 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 loop5: detected capacity change from 0 to 2048 CPU: 1 UID: 0 PID: 10209 Comm: syz-executor.2 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 Call Trace: dump_stack_lvl+0xfa/0x120 should_fail_ex+0x4d7/0x5e0 should_failslab+0xc2/0x120 kmem_cache_alloc_noprof+0x80/0x760 __kernfs_new_node+0xd3/0x940 kernfs_new_node+0x13c/0x1e0 __kernfs_create_file+0x55/0x360 sysfs_add_file_mode_ns+0x21c/0x430 internal_create_group+0x662/0xeb0 loop_configure+0xc46/0x15a0 lo_ioctl+0x674/0x1cb0 blkdev_ioctl+0x365/0x6d0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff9ab00f8d7 Code: 3c 1c 48 f7 d8 49 39 c4 72 b8 e8 a4 54 02 00 85 c0 78 bd 48 83 c4 08 4c 89 e0 5b 41 5c c3 0f 1f 44 00 00 b8 10 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:00007ff9a8584f48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff9ab059970 RCX: 00007ff9ab00f8d7 RDX: 0000000000000004 RSI: 0000000000004c00 RDI: 0000000000000005 RBP: 0000000000000005 R08: 0000000000000000 R09: ffffffffffffffff R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004 R13: 0000000000000004 R14: 0000000020000278 R15: 0000000000000005 EXT4-fs (loop5): unsupported descriptor size 0 loop2: detected capacity change from 0 to 2048 EXT4-fs (loop2): stripe (8) is not aligned with cluster size (16), stripe is disabled EXT4-fs warning (device loop2): read_mmp_block:110: Error -117 while reading MMP block 0 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) loop5: detected capacity change from 0 to 2048 EXT4-fs (loop5): unsupported descriptor size 0 loop6: detected capacity change from 0 to 64 FAT-fs (loop6): invalid media value (0x01) FAT-fs (loop6): Can't find a valid FAT filesystem loop6: detected capacity change from 0 to 64 FAT-fs (loop6): invalid media value (0x01) FAT-fs (loop6): Can't find a valid FAT filesystem loop2: detected capacity change from 0 to 2048 loop5: detected capacity change from 0 to 2048 EXT4-fs (loop2): stripe (8) is not aligned with cluster size (16), stripe is disabled EXT4-fs warning (device loop2): read_mmp_block:110: Error -117 while reading MMP block 0 EXT4-fs (loop5): unsupported descriptor size 0 cgroup2: Unknown parameter 'smackfshat' loop6: detected capacity change from 0 to 64 FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)