INFO: task syz.0.16:6589 blocked for more than 143 seconds. Not tainted 6.16.0-syzkaller-00684-ge5cf61fa6e2f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.16 state:D stack:25672 pid:6589 tgid:6588 ppid:6447 task_flags:0x400140 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5397 [inline] __schedule+0x16aa/0x4c90 kernel/sched/core.c:6786 __schedule_loop kernel/sched/core.c:6864 [inline] schedule+0x165/0x360 kernel/sched/core.c:6879 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6936 rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write_nested+0x1b5/0x200 kernel/locking/rwsem.c:1694 inode_lock_nested include/linux/fs.h:914 [inline] lock_two_directories+0x16b/0x220 fs/namei.c:3243 lock_rename fs/namei.c:3277 [inline] do_renameat2+0x36f/0xa80 fs/namei.c:5224 __do_sys_renameat2 fs/namei.c:5312 [inline] __se_sys_renameat2 fs/namei.c:5309 [inline] __x64_sys_renameat2+0xce/0xe0 fs/namei.c:5309 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa2c578e929 RSP: 002b:00007fa2c65bd038 EFLAGS: 00000246 ORIG_RAX: 000000000000013c RAX: ffffffffffffffda RBX: 00007fa2c59b5fa0 RCX: 00007fa2c578e929 RDX: ffffffffffffff9c RSI: 0000200000000580 RDI: ffffffffffffff9c RBP: 00007fa2c5810b39 R08: 0000000000000000 R09: 0000000000000000 R10: 00002000000005c0 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa2c59b5fa0 R15: 00007ffd2363d888 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e13f0e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by getty/5600: #0: ffff888034ada0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 4 locks held by syz.0.16/6589: #0: ffff888031f12428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888031f12738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff888031f12738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88807fa195f0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88807fa195f0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88807fa195f0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88807fa195f0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.1.17/6774: #0: ffff88805cbfe428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff88805cbfe738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff88805cbfe738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88807fa1b620 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88807fa1b620 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88807fa1b620 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88807fa1b620 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.2.18/6797: #0: ffff888030174428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888030174738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff888030174738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88805b49a940 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88805b49a940 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88805b49a940 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88805b49a940 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.3.19/6826: #0: ffff888033122428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888033122738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff888033122738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88805b49cfe0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88805b49cfe0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88805b49cfe0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88805b49cfe0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.4.20/6854: #0: ffff88805c802428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff88805c802738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff88805c802738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88807fa1cfe0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88807fa1cfe0 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88807fa1cfe0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88807fa1cfe0 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.5.21/6883: #0: ffff888058b84428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888058b84738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff888058b84738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88807fa1f680 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88807fa1f680 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88807fa1f680 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88807fa1f680 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.6.22/6912: #0: ffff88807d7d0428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff88807d7d0738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff88807d7d0738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88805b728910 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88805b728910 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88805b728910 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88805b728910 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.7.23/6947: #0: ffff8880576fe428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff8880576fe738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff8880576fe738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88805b4a1c60 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88805b4a1c60 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88805b4a1c60 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88805b4a1c60 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 4 locks held by syz.8.24/6975: #0: ffff888055850428 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557 #1: ffff888055850738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline] #1: ffff888055850738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x364/0xa80 fs/namei.c:5224 #2: ffff88805b4a4300 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #2: ffff88805b4a4300 (&sb->s_type->i_mutex_key#20/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242 #3: ffff88805b4a4300 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:914 [inline] #3: ffff88805b4a4300 (&sb->s_type->i_mutex_key#21/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-syzkaller-00684-ge5cf61fa6e2f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:470 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-syzkaller-00684-ge5cf61fa6e2f #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: 53 de 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 be 1d 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2 RAX: b90d15d66176af00 RBX: ffffffff81977958 RCX: b90d15d66176af00 RDX: 0000000000000001 RSI: ffffffff8d98713f RDI: ffffffff8be1f620 RBP: ffffc90000197f20 R08: ffff8880b8732f5b R09: 1ffff110170e65eb R10: dffffc0000000000 R11: ffffed10170e65ec R12: ffffffff8fa0caf0 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11003ad3b40 FS: 0000000000000000(0000) GS:ffff888125d3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000565539943a58 CR3: 00000000291d6000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:749 default_idle_call+0x74/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:185 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:325 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:423 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x147