EXT4-fs (loop0): 1 truncate cleaned up EXT4-fs (loop0): mounted filesystem without journal. Opts: jqfmt=vfsold,resgid=0x000000000000ee00,bh,noload,data_err=ignore,usrjquota=,,errors=continue. Quota mode: none. ===================================== WARNING: bad unlock balance detected! syzkaller #0 Not tainted ------------------------------------- syz.0.17/4364 is trying to release lock (&type->i_mutex_dir_key) at: [] swap_inode_boot_loader+0x310/0x10f0 fs/ext4/ioctl.c:262 but there are no more locks to release! other info that might help us debug this: 1 lock held by syz.0.17/4364: #0: ffff888076094460 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write_file+0x5c/0x200 fs/namespace.c:430 stack backtrace: CPU: 1 PID: 4364 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106 __lock_release kernel/locking/lockdep.c:5302 [inline] lock_release+0x52f/0x870 kernel/locking/lockdep.c:5643 up_write+0x29/0x420 kernel/locking/rwsem.c:1603 swap_inode_boot_loader+0x310/0x10f0 fs/ext4/ioctl.c:262 __ext4_ioctl fs/ext4/ioctl.c:1056 [inline] ext4_ioctl+0x18f3/0x3590 fs/ext4/ioctl.c:1282 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc8fa677749 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd0f7b3c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc8fa8cdfa0 RCX: 00007fc8fa677749 RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004 RBP: 00007fc8fa6fbf91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8fa8cdfa0 R14: 00007fc8fa8cdfa0 R15: 0000000000000003 ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON((rwsem_owner(sem) != current) && !rwsem_test_oflags(sem, RWSEM_NONSPINNABLE)): count = 0x0, magic = 0xffff88805d1fa168, owner = 0x0, curr 0xffff888025afbb80, list empty WARNING: CPU: 1 PID: 4364 at kernel/locking/rwsem.c:1350 __up_write kernel/locking/rwsem.c:1349 [inline] WARNING: CPU: 1 PID: 4364 at kernel/locking/rwsem.c:1350 up_write+0x3a1/0x420 kernel/locking/rwsem.c:1604 Modules linked in: CPU: 1 PID: 4364 Comm: syz.0.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 RIP: 0010:__up_write kernel/locking/rwsem.c:1349 [inline] RIP: 0010:up_write+0x3a1/0x420 kernel/locking/rwsem.c:1604 Code: 44 d0 48 c7 c7 60 0f 0b 8a 48 c7 c6 20 12 0b 8a 48 8b 14 24 4c 89 f1 4d 89 e0 4c 8b 4c 24 08 41 52 e8 c3 d0 3b 08 48 83 c4 08 <0f> 0b e9 6b fd ff ff 48 c7 c1 48 69 69 8d 80 e1 07 80 c1 03 38 c1 RSP: 0018:ffffc9000302f950 EFLAGS: 00010296 RAX: 1a3902a8fe7d9e00 RBX: ffff88805d1fa168 RCX: ffff888025afbb80 RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: dffffc0000000000 R09: ffffed10172267b0 R10: ffffed10172267b0 R11: 1ffff110172267af R12: 0000000000000000 R13: ffff88805d1fa1c0 R14: ffff88805d1fa168 R15: 1ffff1100ba3f42e FS: 000055557bcf6500(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000001e7f8000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: swap_inode_boot_loader+0x310/0x10f0 fs/ext4/ioctl.c:262 __ext4_ioctl fs/ext4/ioctl.c:1056 [inline] ext4_ioctl+0x18f3/0x3590 fs/ext4/ioctl.c:1282 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fc8fa677749 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd0f7b3c38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc8fa8cdfa0 RCX: 00007fc8fa677749 RDX: 0000000000000000 RSI: 0000000000006611 RDI: 0000000000000004 RBP: 00007fc8fa6fbf91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fc8fa8cdfa0 R14: 00007fc8fa8cdfa0 R15: 0000000000000003