===================================== WARNING: bad unlock balance detected! 6.19.0-rc5-next-20260114 #1 Not tainted ------------------------------------- syz-executor.2/4110 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.2/4110: #0: ffff88800f6b83f8 (sb_writers#3){.+.+}-{0:0}, at: filename_create+0xf7/0x400 #1: ffff8880506903e0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1b1/0x400 #2: ffff88800f6bc950 (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: 4110 Comm: syz-executor.2 Not tainted 6.19.0-rc5-next-20260114 #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 do_symlinkat+0x153/0x440 __x64_sys_symlink+0x79/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9acfce1427 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:00007ffc0ff9bc38 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9acfce1427 RDX: 00007ffc0ff9bd13 RSI: 00007f9acfd3c022 RDI: 00007ffc0ff9bd00 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc0ff9bad0 R10: 00007ffc0ff9b987 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc0ff9bd00 ------------[ cut here ]------------ WARNING: kernel/rcu/tree_plugin.h:443 at __rcu_read_unlock+0x25f/0x5c0, CPU#0: syz-executor.2/4110 Modules linked in: CPU: 0 UID: 0 PID: 4110 Comm: syz-executor.2 Not tainted 6.19.0-rc5-next-20260114 #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 16 c0 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 24 74 03 e8 bc 5c 56 00 e9 RSP: 0018:ffff88804d7779a0 EFLAGS: 00010286 RAX: 00000000ffffffff RBX: ffff888044d70000 RCX: ffffffff81565a27 RDX: 0000000000000000 RSI: ffffffff81565a30 RDI: ffff888044d703fc RBP: ffff888044d70000 R08: 0000000000000000 R09: fffffbfff0ba6ffc R10: 0000000000000000 R11: 0000000000000001 R12: ffff888044d70000 R13: 0000000000000001 R14: ffffffff85c0e5a0 R15: ffff888050690ca0 FS: 000055558096b400(0000) GS:ffff8880e5343000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558096b708 CR3: 000000004bbd1000 CR4: 0000000000350ef0 Call Trace: __wait_on_freeing_inode+0x10f/0x350 insert_inode_locked+0x25f/0x890 __ext4_new_inode+0x223d/0x4cd0 ext4_symlink+0x623/0xb40 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: 0033:0x7f9acfce1427 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:00007ffc0ff9bc38 EFLAGS: 00000202 ORIG_RAX: 0000000000000058 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f9acfce1427 RDX: 00007ffc0ff9bd13 RSI: 00007f9acfd3c022 RDI: 00007ffc0ff9bd00 RBP: 0000000000000000 R08: 0000000000000000 R09: 00007ffc0ff9bad0 R10: 00007ffc0ff9b987 R11: 0000000000000202 R12: 0000000000000001 R13: 0000000000000001 R14: 0000000000000001 R15: 00007ffc0ff9bd00 irq event stamp: 301 hardirqs last enabled at (301): [] irqentry_exit+0x17b/0x650 hardirqs last disabled at (300): [] sysvec_apic_timer_interrupt+0xf/0x80 softirqs last enabled at (294): [] kernel_fpu_end+0x59/0x70 softirqs last disabled at (292): [] kernel_fpu_begin_mask+0x1bb/0x300 ---[ end trace 0000000000000000 ]--- ======================================================= WARNING: The mand mount option has been deprecated and and is ignored by this kernel. Remove the mand option from the mount to silence this warning. ======================================================= EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. 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 EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. 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 EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. 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 EXT4-fs (sda): re-mounted 7b5d9a40-9011-49ec-8035-27953f97a4d8. 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 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 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 loop2: detected capacity change from 0 to 4 EXT4-fs (loop2): couldn't mount RDWR because of unsupported optional features (660000) loop2: detected capacity change from 0 to 4 EXT4-fs (loop2): couldn't mount RDWR because of unsupported optional features (660000) loop2: detected capacity change from 0 to 4 EXT4-fs (loop2): couldn't mount RDWR because of unsupported optional features (660000) loop2: detected capacity change from 0 to 4 EXT4-fs (loop2): couldn't mount RDWR because of unsupported optional features (660000) loop2: detected capacity change from 0 to 4 EXT4-fs (loop2): couldn't mount RDWR because of unsupported optional features (660000) syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: entered allmulticast mode syz_tun: entered allmulticast mode syz_tun: left allmulticast mode syz_tun: left allmulticast mode netlink: 204 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 204 bytes leftover after parsing attributes in process `syz-executor.1'. audit: type=1400 audit(1768380803.412:10): avc: denied { read } for pid=4517 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 netlink: 204 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 204 bytes leftover after parsing attributes in process `syz-executor.1'. syz-executor.0 uses obsolete (PF_INET,SOCK_PACKET) audit: type=1326 audit(1768380804.008:11): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4594 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f9acfce1b19 code=0x0 audit: type=1326 audit(1768380804.008:12): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=4594 comm="syz-executor.2" exe="/syz-executor.2" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7f9acfce1b19 code=0x0 audit: type=1400 audit(1768380804.524:13): avc: denied { watch_reads } for pid=4672 comm="syz-executor.2" path="/syzkaller-testdir710935971/syzkaller.GSI2cZ/50/file0" dev="tmpfs" ino=1 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:tmpfs_t:s0 tclass=dir permissive=1 audit: type=1400 audit(1768380805.475:14): avc: denied { tracepoint } for pid=4737 comm="syz-executor.4" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 syz-executor.5 (4721) used greatest stack depth: 24120 bytes left syz-executor.0 (4767) used greatest stack depth: 23408 bytes left 9p: Unknown Cache mode or invalid value n 9p: Unknown Cache mode or invalid value n loop6: detected capacity change from 0 to 240 9p: Unknown Cache mode or invalid value n ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: root inode is unusable. Disabling Rock Ridge and switching to Joliet. ISOFS: changing to secondary root 9p: Unknown Cache mode or invalid value n loop6: detected capacity change from 0 to 240 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: root inode is unusable. Disabling Rock Ridge and switching to Joliet. ISOFS: changing to secondary root loop6: detected capacity change from 0 to 240 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: root inode is unusable. Disabling Rock Ridge and switching to Joliet. ISOFS: changing to secondary root loop6: detected capacity change from 0 to 240 ISO 9660 Extensions: Microsoft Joliet Level 3 ISOFS: root inode is unusable. Disabling Rock Ridge and switching to Joliet. ISOFS: changing to secondary root netlink: 340 bytes leftover after parsing attributes in process `syz-executor.2'. sr 1:0:0:0: [sr0] CDROM not ready. Make sure there is a disc in the drive. netlink: 340 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 340 bytes leftover after parsing attributes in process `syz-executor.2'. netlink: 340 bytes leftover after parsing attributes in process `syz-executor.2'. loop0: detected capacity change from 0 to 16 EXT4-fs (loop0): #clusters per group too big: 32803 loop0: detected capacity change from 0 to 16 EXT4-fs (loop0): #clusters per group too big: 32803 loop4: detected capacity change from 0 to 512 loop0: detected capacity change from 0 to 16 EXT4-fs (loop0): #clusters per group too big: 32803 EXT4-fs (loop4): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: writeback. ext4 filesystem being mounted at /syzkaller-testdir741138893/syzkaller.fBi39g/68/file0 supports timestamps until 2038-01-19 (0x7fffffff) EXT4-fs (loop4): unmounting filesystem 00000000-0000-0000-0000-000000000000. loop0: detected capacity change from 0 to 16 EXT4-fs (loop0): #clusters per group too big: 32803