===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260113 #1 Not tainted ------------------------------------- syz-executor.3/6716 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.3/6716: #0: ffff88800fa6c3f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff888049a3bd10 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f978950 (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: 6716 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260113 #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+0x406/0xb40 vfs_symlink+0x44b/0x840 do_symlinkat+0x153/0x440 __x64_sys_symlink+0x79/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa99bc06427 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:00007fffd032f678 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa99bc06427 RDX: ffffffffffffffbc RSI: 00007fa99bc6100e RDI: 00007fa99bc601dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffd032f0f0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffd032f740 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#1: syz-executor.3/6716 Modules linked in: CPU: 1 UID: 0 PID: 6716 Comm: syz-executor.3 Not tainted 6.19.0-rc5-next-20260113 #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 a6 bb de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 89 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 61 f9 73 03 e8 0c 88 56 00 e9 RSP: 0018:ffff88806cf08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff88801dd9b700 RCX: ffffffff81893b34 RDX: 0000000000000000 RSI: ffffffff81893b4b RDI: ffff88801dd9bafc RBP: ffff88801dd9b700 R08: ffffffff81893a8d R09: 0000000000000000 R10: 0000000000000000 R11: ffff88806cf08ff8 R12: ffff88801dd9b700 R13: 0000000000000001 R14: ffff88806cf379c0 R15: ffff88806cf37a20 FS: 0000555566df1400(0000) GS:ffff8880e5442000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2cf30000 CR3: 000000001df5e000 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:__sanitizer_cov_trace_pc+0x0/0x80 Code: 5d 41 5c 41 5d e9 e0 ef 5b 03 48 c7 c0 f4 ff ff ff eb 92 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 34 24 65 48 8b 15 48 5e 38 06 65 8b 05 59 5e 38 RSP: 0018:ffff88804af0f748 EFLAGS: 00000206 RAX: 0000000000000000 RBX: ffffffff86683440 RCX: ffffffff84c4fbdf RDX: ffff88801dd9b700 RSI: ffffffff815d780f RDI: 0000000000000006 RBP: ffffffff815d0efd R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff815d0efd R11: 0000000000000000 R12: ffffffff815d780f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b __report_bug+0x4d9/0x5b0 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 a6 bb de ff 4d 85 f6 0f 84 73 fe ff ff e8 38 89 20 00 fb e9 68 fe ff ff 90 <0f> 0b 90 5b 5d 41 5c 41 5d 41 5e e9 61 f9 73 03 e8 0c 88 56 00 e9 RSP: 0018:ffff88804af0f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801dd9b700 RCX: ffffffff815664c7 RDX: 0000000000000000 RSI: ffffffff815664d0 RDI: ffff88801dd9bafc RBP: ffff88801dd9b700 R08: 0000000000000000 R09: fffffbfff0ba6ff4 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801dd9b700 R13: 0000000000000001 R14: ffffffff85c0fe50 R15: ffff88801b7a32c0 __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x406/0xb40 vfs_symlink+0x44b/0x840 do_symlinkat+0x153/0x440 __x64_sys_symlink+0x79/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa99bc06427 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:00007fffd032f678 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa99bc06427 RDX: ffffffffffffffbc RSI: 00007fa99bc6100e RDI: 00007fa99bc601dd RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fffd032f0f0 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffd032f740 irq event stamp: 697 hardirqs last enabled at (697): [] _raw_spin_unlock_irqrestore+0x2c/0x50 hardirqs last disabled at (696): [] _raw_spin_lock_irqsave+0x53/0x60 softirqs last enabled at (692): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (690): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- loop5: detected capacity change from 0 to 256 loop3: detected capacity change from 0 to 256 FAT-fs (loop3): bogus number of FAT structure FAT-fs (loop3): Can't find a valid FAT filesystem FAT-fs (loop5): bogus logical sector size 25964 FAT-fs (loop5): Can't find a valid FAT filesystem FAT-fs (loop4): bogus number of FAT structure FAT-fs (loop4): Can't find a valid FAT filesystem set_capacity_and_notify: 2 callbacks suppressed loop2: detected capacity change from 0 to 256 loop3: detected capacity change from 0 to 256 loop5: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 48 loop6: detected capacity change from 0 to 256 FAT-fs (loop5): bogus logical sector size 25964 FAT-fs (loop4): FAT read failed (blocknr 32) FAT-fs (loop5): Can't find a valid FAT filesystem loop6: detected capacity change from 0 to 264192 loop1: detected capacity change from 0 to 264192 loop3: detected capacity change from 0 to 256 loop5: detected capacity change from 0 to 256 loop4: detected capacity change from 0 to 48 FAT-fs (loop0): bogus logical sector size 25964 FAT-fs (loop0): Can't find a valid FAT filesystem FAT-fs (loop4): FAT read failed (blocknr 32) FAT-fs (loop5): bogus logical sector size 25964 FAT-fs (loop5): Can't find a valid FAT filesystem FAULT_INJECTION: forcing a failure. name fail_usercopy, interval 1, probability 0, space 0, times 1 CPU: 0 UID: 0 PID: 6788 Comm: syz-executor.6 Tainted: G W 6.19.0-rc5-next-20260113 #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_from_user+0x30/0xd0 clear_refs_write+0x102/0xbf0 vfs_write+0x2b7/0x1150 ksys_write+0x121/0x240 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff09f676b19 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:00007ff09cbec188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ff09f789f60 RCX: 00007ff09f676b19 RDX: 0000000000000031 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00007ff09cbec1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd17d830af R14: 00007ff09cbec300 R15: 0000000000022000 ---------------- Code disassembly (best guess): 0: 5d pop %rbp 1: 41 5c pop %r12 3: 41 5d pop %r13 5: e9 e0 ef 5b 03 jmpq 0x35befea a: 48 c7 c0 f4 ff ff ff mov $0xfffffffffffffff4,%rax 11: eb 92 jmp 0xffffffa5 13: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop 28: 90 nop 29: 90 nop * 2a: f3 0f 1e fa endbr64 <-- trapping instruction 2e: 48 8b 34 24 mov (%rsp),%rsi 32: 65 48 8b 15 48 5e 38 mov %gs:0x6385e48(%rip),%rdx # 0x6385e82 39: 06 3a: 65 gs 3b: 8b .byte 0x8b 3c: 05 .byte 0x5 3d: 59 pop %rcx 3e: 5e pop %rsi 3f: 38 .byte 0x38