cgroup: Need name or subsystem set ===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260116 #1 Not tainted ------------------------------------- syz-executor.0/3987 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.0/3987: #0: ffff88800fb483f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff88801c2a96f0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800fb4c950 (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: 3987 Comm: syz-executor.0 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: 0033:0x7f0ea3721427 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:00007ffe29e9c7e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0ea3721427 RDX: 00007ffe29e9c8c7 RSI: 00007f0ea377c019 RDI: 00007ffe29e9c8b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe29e9c680 R10: 00007ffe29e9c537 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe29e9c8b0 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.0/3987 Modules linked in: CPU: 0 UID: 0 PID: 3987 Comm: syz-executor.0 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: ffff88801b98d280 RCX: ffffffff81893bc4 RDX: 0000000000000000 RSI: ffffffff81893bdb RDI: ffff88801b98d67c RBP: ffff88801b98d280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 00000000000002d5 R12: ffff88801b98d280 R13: 0000000000000000 R14: ffff88806ce379c0 R15: ffff88806ce37a20 FS: 000055555d73d400(0000) GS:ffff8880e5342000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0ea37a1540 CR3: 0000000048814000 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:__report_bug+0x4d9/0x5b0 Code: 83 c0 03 38 d0 7c 08 84 d2 0f 85 b0 00 00 00 48 63 2b 4c 89 e7 48 01 dd 48 89 ee e8 11 31 b0 fc 49 39 ec 74 22 e8 77 36 b0 fc <48> 83 c3 10 48 81 fb 20 8b 6c 86 72 b2 e8 65 36 b0 fc 4c 89 e7 e8 RSP: 0018:ffff88801fd7f750 EFLAGS: 00000293 RAX: 0000000000000000 RBX: ffffffff8667f1c0 RCX: ffffffff84c54bdf RDX: ffff88801b98d280 RSI: ffffffff84c54be9 RDI: 0000000000000006 RBP: ffffffff8151b53a R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8151b53a R11: 0000000000000000 R12: ffffffff815d742f R13: dffffc0000000000 R14: 0000000000000002 R15: 000000000000000b 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:ffff88801fd7f9a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff88801b98d280 RCX: ffffffff815660f7 RDX: 0000000000000000 RSI: ffffffff81566100 RDI: ffff88801b98d67c RBP: ffff88801b98d280 R08: 0000000000000000 R09: fffffbfff0ba7040 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801b98d280 R13: 0000000000000001 R14: ffffffff85c0e730 R15: ffff88801c1ba938 __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: 0033:0x7f0ea3721427 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:00007ffe29e9c7e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0ea3721427 RDX: 00007ffe29e9c8c7 RSI: 00007f0ea377c019 RDI: 00007ffe29e9c8b0 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffe29e9c680 R10: 00007ffe29e9c537 R11: 0000000000000206 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffe29e9c8b0 irq event stamp: 213 hardirqs last enabled at (213): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (211): [] handle_softirqs+0x65e/0x7d0 softirqs last enabled at (212): [] __irq_exit_rcu+0xc4/0x100 softirqs last disabled at (203): [] __irq_exit_rcu+0xc4/0x100 ---[ end trace 0000000000000000 ]--- loop4: detected capacity change from 0 to 20 tmpfs: Bad value for 'mpol' cgroup: Need name or subsystem set loop4: detected capacity change from 0 to 20 tmpfs: Unknown parameter 'nl80211' EXT4-fs (loop1): unable to read superblock loop5: detected capacity change from 0 to 144 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop5): mounted filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09 r/w without journal. Quota mode: none. ext4 filesystem being mounted at /syzkaller-testdir000802638/syzkaller.VB6kZx/2/mnt supports timestamps until 2038-01-19 (0x7fffffff) UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 netlink: 4 bytes leftover after parsing attributes in process `syz-executor.3'. EXT4-fs (loop5): unmounting filesystem 76b65be2-f6da-4727-8c75-0525a5b65a09. UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 misc raw-gadget: fail, usb_gadget_register_driver returned -16 ---------------- Code disassembly (best guess): 0: 83 c0 03 add $0x3,%eax 3: 38 d0 cmp %dl,%al 5: 7c 08 jl 0xf 7: 84 d2 test %dl,%dl 9: 0f 85 b0 00 00 00 jne 0xbf f: 48 63 2b movslq (%rbx),%rbp 12: 4c 89 e7 mov %r12,%rdi 15: 48 01 dd add %rbx,%rbp 18: 48 89 ee mov %rbp,%rsi 1b: e8 11 31 b0 fc callq 0xfcb03131 20: 49 39 ec cmp %rbp,%r12 23: 74 22 je 0x47 25: e8 77 36 b0 fc callq 0xfcb036a1 * 2a: 48 83 c3 10 add $0x10,%rbx <-- trapping instruction 2e: 48 81 fb 20 8b 6c 86 cmp $0xffffffff866c8b20,%rbx 35: 72 b2 jb 0xffffffe9 37: e8 65 36 b0 fc callq 0xfcb036a1 3c: 4c 89 e7 mov %r12,%rdi 3f: e8 .byte 0xe8