===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.2/7647 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.2/7647: #0: ffff88800e5f03f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801b360d68 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800e5f4950 (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: 7647 Comm: syz-executor.2 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: 0033:0x7fd3d82f4427 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:00007fff678a11d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd3d82f4427 RDX: 00007fff678a12b3 RSI: 00007fd3d834f02f RDI: 00007fff678a12a0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff678a1070 R10: 00007fff678a0f27 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff678a12a0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.2/7647 Modules linked in: CPU: 0 UID: 0 PID: 7647 Comm: syz-executor.2 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:ffff88806ce08cb8 EFLAGS: 00010086 RAX: 00000000ffffffff RBX: ffff888048903700 RCX: ffffffff81893bc4 RDX: 0000000000000000 RSI: ffffffff81893bdb RDI: ffff888048903afc RBP: ffff888048903700 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000000027e R12: ffff888048903700 R13: 0000000000000000 R14: ffff88806ce379c0 R15: ffff88806ce37a20 FS: 000055558b3d4400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2ddd0243a4 CR3: 0000000050849000 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+0x8/0x80 Code: 5c 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 f3 0f 1e fa 48 8b 34 24 <65> 48 8b 15 a8 5d 38 06 65 8b 05 b9 5d 38 06 a9 00 01 ff 00 74 27 RSP: 0018:ffff88805088f748 EFLAGS: 00000202 RAX: 0000000000000000 RBX: ffffffff8667e480 RCX: ffffffff84c54bdf RDX: ffff888048903700 RSI: ffffffff84c54be9 RDI: 0000000000000006 RBP: ffffffff814d25d7 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff814d25d7 R11: 0000000000000000 R12: ffffffff815d742f 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 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:ffff88805088f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888048903700 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff888048903afc RBP: ffff888048903700 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff888048903700 R13: 0000000000000001 R14: ffffffff85c0d3d0 R15: ffff88801b3c58e0 __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: 0033:0x7fd3d82f4427 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:00007fff678a11d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fd3d82f4427 RDX: 00007fff678a12b3 RSI: 00007fd3d834f02f RDI: 00007fff678a12a0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007fff678a1070 R10: 00007fff678a0f27 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: 00007fff678a12a0 irq event stamp: 2537 hardirqs last enabled at (2537): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (2535): [] handle_softirqs+0x65e/0x7d0 softirqs last enabled at (2536): [] __irq_exit_rcu+0xc4/0x100 softirqs last disabled at (2527): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- loop3: detected capacity change from 0 to 131078 loop1: detected capacity change from 0 to 512 No source specified loop4: detected capacity change from 0 to 512 loop2: detected capacity change from 0 to 512 loop5: detected capacity change from 0 to 512 loop0: detected capacity change from 0 to 512 EXT4-fs error (device loop4): ext4_ext_check_inode:528: inode #2: comm syz-executor.4: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) EXT4-fs error (device loop2): ext4_quota_enable:7184: inode #3: comm syz-executor.2: iget: special inode unallocated EXT4-fs error (device loop2): ext4_quota_enable:7186: comm syz-executor.2: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop2): ext4_enable_quotas:7224: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs error (device loop0): ext4_quota_enable:7184: inode #3: comm syz-executor.0: iget: special inode unallocated EXT4-fs (loop2): mount failed EXT4-fs error (device loop0): ext4_quota_enable:7186: comm syz-executor.0: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop0): ext4_enable_quotas:7224: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop4): get root inode failed EXT4-fs (loop0): mount failed EXT4-fs error (device loop5): __ext4_fill_super:5560: inode #2: comm syz-executor.5: iget: special inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs (loop4): mount failed EXT4-fs (loop1): bad geometry: block count 256 exceeds size of device (70 blocks) set_capacity_and_notify: 3 callbacks suppressed loop0: detected capacity change from 0 to 512 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 UID: 0 PID: 7710 Comm: syz-executor.6 Tainted: G W 6.19.0-rc5-next-20260116 #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 vm_area_alloc+0x20/0x170 __mmap_region+0xc30/0x2770 mmap_region+0x314/0x3e0 do_mmap+0xa36/0x11d0 __do_sys_remap_file_pages+0x966/0xab0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2fbafdcb19 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:00007f2fb8552188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d8 RAX: ffffffffffffffda RBX: 00007f2fbb0eff60 RCX: 00007f2fbafdcb19 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000020ffc000 RBP: 00007f2fb85521d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fffe3ab734f R14: 00007f2fb8552300 R15: 0000000000022000 loop1: detected capacity change from 0 to 141 loop5: detected capacity change from 0 to 512 loop4: detected capacity change from 0 to 512 EXT4-fs (loop1): bad geometry: block count 256 exceeds size of device (70 blocks) EXT4-fs error (device loop0): ext4_quota_enable:7184: inode #3: comm syz-executor.0: iget: special inode unallocated EXT4-fs error (device loop0): ext4_quota_enable:7186: comm syz-executor.0: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop0): ext4_enable_quotas:7224: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop0): mount failed EXT4-fs error (device loop5): __ext4_fill_super:5560: inode #2: comm syz-executor.5: iget: special inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed EXT4-fs error (device loop4): ext4_ext_check_inode:528: inode #2: comm syz-executor.4: pblk 0 bad header/extent: invalid extent entries - magic f30a, entries 1, max 4(4), depth 0(0) loop2: detected capacity change from 0 to 512 loop1: detected capacity change from 0 to 141 loop3: detected capacity change from 0 to 131078 EXT4-fs (loop4): get root inode failed EXT4-fs error (device loop2): __ext4_fill_super:5560: inode #2: comm syz-executor.2: iget: special inode unallocated EXT4-fs (loop4): mount failed EXT4-fs (loop2): get root inode failed EXT4-fs (loop2): mount failed EXT4-fs (loop1): bad geometry: block count 256 exceeds size of device (70 blocks) loop0: detected capacity change from 0 to 512 loop5: detected capacity change from 0 to 512 EXT4-fs error (device loop0): ext4_quota_enable:7184: inode #3: comm syz-executor.0: iget: special inode unallocated EXT4-fs error (device loop0): ext4_quota_enable:7186: comm syz-executor.0: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop0): ext4_enable_quotas:7224: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop0): mount failed EXT4-fs error (device loop5): __ext4_fill_super:5560: inode #2: comm syz-executor.5: iget: special inode unallocated EXT4-fs (loop5): get root inode failed EXT4-fs (loop5): mount failed ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 48 c7 c0 f4 ff ff ff mov $0xfffffffffffffff4,%rax 7: eb 92 jmp 0xffffff9b 9: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: f3 0f 1e fa endbr64 24: 48 8b 34 24 mov (%rsp),%rsi * 28: 65 48 8b 15 a8 5d 38 mov %gs:0x6385da8(%rip),%rdx # 0x6385dd8 <-- trapping instruction 2f: 06 30: 65 8b 05 b9 5d 38 06 mov %gs:0x6385db9(%rip),%eax # 0x6385df0 37: a9 00 01 ff 00 test $0xff0100,%eax 3c: 74 27 je 0x65