INFO: task syz-executor.0:4507 blocked for more than 143 seconds.
Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:21824 pid: 4507 ppid: 1 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
schedule+0x11b/0x1e0 kernel/sched/core.c:6459
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
__mutex_lock_common+0xc71/0x2390 kernel/locking/mutex.c:669
__mutex_lock kernel/locking/mutex.c:729 [inline]
mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
fuse_lock_inode+0xcd/0x120 fs/fuse/inode.c:491
fuse_lookup+0xd4/0x5a0 fs/fuse/dir.c:427
__lookup_slow+0x27d/0x3d0 fs/namei.c:1663
lookup_slow+0x53/0x70 fs/namei.c:1680
walk_component+0x319/0x460 fs/namei.c:1976
link_path_walk+0x662/0xd40 fs/namei.c:-1
path_openat+0x27d/0x2f30 fs/namei.c:3738
do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
do_sys_openat2+0x142/0x4a0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1280
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: 0033:0x7f2583833581
RSP: 002b:00007ffca9ff9280 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f2583833581
RDX: 0000000000090800 RSI: 00007f258387e45d RDI: 00000000ffffff9c
RBP: 00007ffca9ff934c R08: 0000000000000000 R09: 002c77e593bb3b3f
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 00000000000108fa R14: 00000000000108ad R15: 0000000000000006
INFO: task syz-executor.0:4594 blocked for more than 143 seconds.
Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:25520 pid: 4594 ppid: 4507 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5030 [inline]
__schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
schedule+0x11b/0x1e0 kernel/sched/core.c:6459
request_wait_answer fs/fuse/dev.c:411 [inline]
__fuse_request_send fs/fuse/dev.c:430 [inline]
fuse_simple_request+0x10e7/0x19c0 fs/fuse/dev.c:515
fuse_lookup_name+0x279/0x700 fs/fuse/dir.c:383
fuse_lookup+0x13b/0x5a0 fs/fuse/dir.c:428
__lookup_slow+0x27d/0x3d0 fs/namei.c:1663
lookup_slow+0x53/0x70 fs/namei.c:1680
walk_component+0x319/0x460 fs/namei.c:1976
link_path_walk+0x662/0xd40 fs/namei.c:-1
path_openat+0x27d/0x2f30 fs/namei.c:3738
do_filp_open+0x1b3/0x3e0 fs/namei.c:3769
do_sys_openat2+0x142/0x4a0 fs/open.c:1253
do_sys_open fs/open.c:1269 [inline]
__do_sys_openat fs/open.c:1285 [inline]
__se_sys_openat fs/open.c:1280 [inline]
__x64_sys_openat+0x135/0x160 fs/open.c:1280
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: 0033:0x7f2583832720
RSP: 002b:00007f2582b93e20 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f2583832720
RDX: 0000000000000002 RSI: 00007f2582b93f40 RDI: 00000000ffffff9c
RBP: 00007f2582b93f40 R08: 0000000000000000 R09: 00000000000004a0
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000004
R13: 00007f2582b93f3c R14: 00007f2582b93f40 R15: 00007f257a774000
Showing all locks held in the system:
1 lock held by khungtaskd/27:
#0: ffffffff8c11c360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by getty/3946:
#0: ffff88802bf29098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
2 locks held by syz-executor.0/4507:
#0: ffff888071ba0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
#0: ffff888071ba0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
#1: ffff888071ba05b8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xcd/0x120 fs/fuse/inode.c:491
2 locks held by syz-executor.0/4594:
#0: ffff888071ba0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:797 [inline]
#0: ffff888071ba0150 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1679
#1: ffff888071ba05b8 (&fi->mutex){+.+.}-{3:3}, at: fuse_lock_inode+0xcd/0x120 fs/fuse/inode.c:491
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe0f/0xe50 kernel/hung_task.c:369
kthread+0x436/0x520 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:728