EXT4-fs (loop4): unable to read superblock ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.6/4162 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.6/4162: #0: ffff88800fa923f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801c3e6cb8 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fa96950 (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: 4162 Comm: syz-executor.6 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: 0033:0x7f56d6756427 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:00007ffc94eb3b48 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f56d6756427 RDX: 00007ffc94eb3c23 RSI: 00007f56d67b1022 RDI: 00007ffc94eb3c10 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc94eb39e0 R10: 00007ffc94eb3897 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc94eb3c10 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.6/4162 Modules linked in: CPU: 0 UID: 0 PID: 4162 Comm: syz-executor.6 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: ffff88800ecad280 RCX: ffffffff81893bc4 RDX: 0000000000000000 RSI: ffffffff81893bdb RDI: ffff88800ecad67c RBP: ffff88800ecad280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000002fa R12: ffff88800ecad280 R13: 0000000000000000 R14: ffff88806ce379c0 R15: ffff88806ce37a20 FS: 00005555851ac400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2d52f000 CR3: 000000001e65f000 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:write_comp_data+0x12/0xa0 Code: 03 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 65 8b 05 76 64 38 06 65 48 8b 15 56 64 38 06 00 01 ff 00 74 27 f6 c4 01 74 1d a9 00 00 0f 00 75 16 a9 00 00 RSP: 0018:ffff888015ebf748 EFLAGS: 00000283 RAX: 0000000000000002 RBX: ffffffff86680ef0 RCX: ffffffff84c54bdf RDX: ffff88800ecad280 RSI: ffffffff815d742f RDI: 0000000000000006 RBP: ffffffff84d127e6 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff84d127e6 R11: 0000000000000000 R12: ffffffff815d742f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b __report_bug+0x4cf/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:ffff888015ebf9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88800ecad280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88800ecad67c RBP: ffff88800ecad280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88800ecad280 R13: 0000000000000001 R14: ffffffff85c0ed70 R15: ffff888048198ca0 __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: 0033:0x7f56d6756427 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:00007ffc94eb3b48 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f56d6756427 RDX: 00007ffc94eb3c23 RSI: 00007f56d67b1022 RDI: 00007ffc94eb3c10 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc94eb39e0 R10: 00007ffc94eb3897 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc94eb3c10 irq event stamp: 609 hardirqs last enabled at (609): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (607): [] handle_softirqs+0x65e/0x7d0 softirqs last enabled at (608): [] __irq_exit_rcu+0xc4/0x100 softirqs last disabled at (599): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- hugetlbfs: Unknown parameter 'trusted.overlay.opaque' hugetlbfs: Unknown parameter 'trusted.overlay.opaque' EXT4-fs (loop4): unable to read superblock loop0: detected capacity change from 0 to 6 loop2: detected capacity change from 0 to 512 FAT-fs (loop0): Directory bread(block 6) failed EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. loop0: detected capacity change from 0 to 6 EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. syz-executor.3 (4142) used greatest stack depth: 23992 bytes left loop2: detected capacity change from 0 to 512 tmpfs: Unknown parameter ')Ë' EXT4-fs (loop2): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. loop4: detected capacity change from 0 to 264192 loop4: detected capacity change from 0 to 264192 tmpfs: Unknown parameter ')Ë' EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000. cgroup: release_agent respecified cgroup: release_agent respecified audit: type=1400 audit(1768758507.774:12): avc: denied { tracepoint } for pid=4250 comm="syz-executor.5" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 loop5: detected capacity change from 0 to 64 FAT-fs (loop5): bogus number of FAT structure FAT-fs (loop5): Can't find a valid FAT filesystem loop6: detected capacity change from 0 to 4 loop5: detected capacity change from 0 to 64 loop6: detected capacity change from 0 to 4 FAT-fs (loop5): bogus number of FAT structure FAT-fs (loop5): Can't find a valid FAT filesystem ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 7: 90 nop 8: 90 nop 9: 90 nop a: 90 nop b: 90 nop c: 90 nop d: 90 nop e: 90 nop f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 49 89 d2 mov %rdx,%r10 1a: 65 8b 05 76 64 38 06 mov %gs:0x6386476(%rip),%eax # 0x6386497 21: 65 48 8b 15 56 64 38 mov %gs:0x6386456(%rip),%rdx # 0x638647f 28: 06 * 29: a9 00 01 ff 00 test $0xff0100,%eax <-- trapping instruction 2e: 74 27 je 0x57 30: f6 c4 01 test $0x1,%ah 33: 74 1d je 0x52 35: a9 00 00 0f 00 test $0xf0000,%eax 3a: 75 16 jne 0x52 3c: a9 .byte 0xa9