===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260115 #1 Not tainted ------------------------------------- syz-executor.6/4699 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.6/4699: #0: ffff88800f83c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801afe5020 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f880950 (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: 4699 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: 0033:0x7f7f7d435427 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:00007ffc72307818 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7f7d435427 RDX: ffffffffffffffbc RSI: 00007f7f7d49000e RDI: 00007f7f7d48f1dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc72307290 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc723078e0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.6/4699 Modules linked in: CPU: 0 UID: 0 PID: 4699 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:ffff88804ec1f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801e0d9b80 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801e0d9f7c RBP: ffff88801e0d9b80 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801e0d9b80 R13: 0000000000000001 R14: ffffffff85c0f130 R15: ffff88803b521fb0 FS: 00005555611a8400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc72306cb8 CR3: 000000001a874000 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: 0033:0x7f7f7d435427 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:00007ffc72307818 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7f7d435427 RDX: ffffffffffffffbc RSI: 00007f7f7d49000e RDI: 00007f7f7d48f1dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc72307290 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc723078e0 irq event stamp: 663 hardirqs last enabled at (663): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (662): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (658): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (656): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 UID: 0 PID: 4701 Comm: syz-executor.5 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 prepare_creds+0x2c/0x840 set_current_groups+0x16/0xe0 __do_sys_setgroups+0x3d0/0x4e0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f84111a8b19 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:00007f840e6fd188 EFLAGS: 00000246 ORIG_RAX: 0000000000000074 RAX: ffffffffffffffda RBX: 00007f84112bc020 RCX: 00007f84111a8b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f840e6fd1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1a7f2dff R14: 00007f840e6fd300 R15: 0000000000022000 loop2: detected capacity change from 0 to 512 loop3: detected capacity change from 0 to 512 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 EXT4-fs error (device loop3): __ext4_fill_super:5560: inode #2: comm syz-executor.3: iget: special inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop3): mount failed loop3: detected capacity change from 0 to 512 loop2: detected capacity change from 0 to 512 FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 CPU: 0 UID: 0 PID: 4745 Comm: syz-executor.6 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 _copy_to_user+0x32/0xd0 simple_read_from_buffer+0xe0/0x180 proc_fail_nth_read+0x18a/0x240 vfs_read+0x1eb/0xc70 ksys_read+0x121/0x240 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7f7d3e869c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 fc ff ff 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 2f fd ff ff 48 RSP: 002b:00007f7f7a9ab170 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f7f7d3e869c RDX: 000000000000000f RSI: 00007f7f7a9ab1e0 RDI: 0000000000000004 RBP: 00007f7f7a9ab1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc723075cf R14: 00007f7f7a9ab300 R15: 0000000000022000 EXT4-fs error (device loop3): __ext4_fill_super:5560: inode #2: comm syz-executor.3: iget: special inode unallocated EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop3): get root inode failed EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed EXT4-fs (loop3): mount failed loop4: detected capacity change from 0 to 64 FAT-fs (loop4): bogus number of FAT structure FAT-fs (loop4): Can't find a valid FAT filesystem loop2: detected capacity change from 0 to 512 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 loop3: detected capacity change from 0 to 512 loop7: detected capacity change from 0 to 512 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 UID: 0 PID: 4772 Comm: syz-executor.5 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 __kmalloc_noprof+0xd6/0x830 security_prepare_creds+0x101/0x160 prepare_creds+0x562/0x840 set_current_groups+0x16/0xe0 __do_sys_setgroups+0x3d0/0x4e0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f84111a8b19 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:00007f840e71e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000074 RAX: ffffffffffffffda RBX: 00007f84112bbf60 RCX: 00007f84111a8b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f840e71e1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffc1a7f2dff R14: 00007f840e71e300 R15: 0000000000022000 EXT4-fs error (device loop7): __ext4_fill_super:5560: inode #2: comm syz-executor.7: iget: special inode unallocated EXT4-fs (loop7): get root inode failed EXT4-fs (loop7): mount failed loop2: detected capacity change from 0 to 512 EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated loop7: detected capacity change from 0 to 512 loop0: detected capacity change from 0 to 512 loop3: detected capacity change from 0 to 512 EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed EXT4-fs error (device loop7): __ext4_fill_super:5560: inode #2: comm syz-executor.7: iget: special inode unallocated