INFO: task syz-executor.0:6002 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:23592 pid:6002 tgid:6002 ppid:1 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
rwsem_down_read_slowpath+0x64b/0xbf0 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1261 [inline]
__down_read kernel/locking/rwsem.c:1274 [inline]
down_read+0xef/0x480 kernel/locking/rwsem.c:1539
inode_lock_shared include/linux/fs.h:995 [inline]
lookup_slow fs/namei.c:1832 [inline]
walk_component+0x345/0x5b0 fs/namei.c:2151
link_path_walk+0x627/0xe20 fs/namei.c:2519
path_openat+0x1b0/0x2cb0 fs/namei.c:4130
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff32967c311
RSP: 002b:00007ffe90cb0d50 EFLAGS: 00000287 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007ff32967c311
RDX: 0000000000090800 RSI: 00007ff3296d7b46 RDI: 00000000ffffff9c
RBP: 00007ffe90cb0e1c R08: 0000000000000000 R09: 00007ff32a3e9000
R10: 0000000000000000 R11: 0000000000000287 R12: 0000000000000000
R13: 0000000000015df4 R14: 0000000000015aa9 R15: 0000000000000009
INFO: task syz-executor.0:6062 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:25832 pid:6062 tgid:6061 ppid:6002 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
request_wait_answer+0x553/0x7d0 fs/fuse/dev.c:585
__fuse_request_send fs/fuse/dev.c:599 [inline]
__fuse_simple_request+0x4d9/0xe10 fs/fuse/dev.c:693
fuse_simple_request fs/fuse/fuse_i.h:1250 [inline]
fuse_lookup_name+0x2ad/0x780 fs/fuse/dir.c:381
fuse_lookup+0x26a/0x560 fs/fuse/dir.c:428
__lookup_slow+0x24e/0x460 fs/namei.c:1816
lookup_slow fs/namei.c:1833 [inline]
walk_component+0x353/0x5b0 fs/namei.c:2151
link_path_walk+0x627/0xe20 fs/namei.c:2519
path_openat+0x1b0/0x2cb0 fs/namei.c:4130
do_filp_open+0x20b/0x470 fs/namei.c:4161
do_sys_openat2+0x11b/0x1d0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x174/0x210 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff32967c859
RSP: 002b:00007ff32a3e80c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff32979bf80 RCX: 00007ff32967c859
RDX: 0000000000000042 RSI: 0000000020002080 RDI: ffffffffffffff9c
RBP: 00007ff3296d8ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff32979bf80 R15: 00007ffe90cb0aa8
INFO: task syz-executor.0:6067 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0 state:D stack:28928 pid:6067 tgid:6061 ppid:6002 task_flags:0x400140 flags:0x00080003
Call Trace:
context_switch kernel/sched/core.c:5325 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6929
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083
rwsem_down_write_slowpath+0x521/0x1310 kernel/locking/rwsem.c:1185
__down_write_common kernel/locking/rwsem.c:1317 [inline]
__down_write kernel/locking/rwsem.c:1326 [inline]
down_write_nested+0x1da/0x210 kernel/locking/rwsem.c:1707
inode_lock_nested include/linux/fs.h:1025 [inline]
fuse_reverse_inval_entry+0x59/0x580 fs/fuse/dir.c:1400
fuse_notify_delete fs/fuse/dev.c:1753 [inline]
fuse_notify fs/fuse/dev.c:2114 [inline]
fuse_dev_do_write+0x1d91/0x3a50 fs/fuse/dev.c:2204
fuse_dev_write+0x16a/0x200 fs/fuse/dev.c:2288
new_sync_write fs/read_write.c:593 [inline]
vfs_write+0x7d0/0x11d0 fs/read_write.c:686
ksys_write+0x12a/0x250 fs/read_write.c:738
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff32967c859
RSP: 002b:00007ff32a3c70c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007ff32979c050 RCX: 00007ff32967c859
RDX: 000000000000002c RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00007ff3296d8ad0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007ff32979c050 R15: 00007ffe90cb0aa8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e3c44a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c44a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline]
#0: ffffffff8e3c44a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
2 locks held by getty/5569:
#0: ffff88814e0880a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz-executor.0/6002:
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline]
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow fs/namei.c:1832 [inline]
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: walk_component+0x345/0x5b0 fs/namei.c:2151
2 locks held by syz-executor.0/6062:
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:995 [inline]
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: lookup_slow fs/namei.c:1832 [inline]
#0: ffff888071d80148 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: walk_component+0x345/0x5b0 fs/namei.c:2151
#1: ffff888071d805f8 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd2/0x110 fs/fuse/inode.c:604
2 locks held by syz-executor.0/6067:
#0: ffff88807f7d1328 (&fc->killsb){.+.+}-{4:4}, at: fuse_notify_delete fs/fuse/dev.c:1752 [inline]
#0: ffff88807f7d1328 (&fc->killsb){.+.+}-{4:4}, at: fuse_notify fs/fuse/dev.c:2114 [inline]
#0: ffff88807f7d1328 (&fc->killsb){.+.+}-{4:4}, at: fuse_dev_do_write+0x1d71/0x3a50 fs/fuse/dev.c:2204
#1: ffff888071d80148 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1025 [inline]
#1: ffff888071d80148 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: fuse_reverse_inval_entry+0x59/0x580 fs/fuse/dir.c:1400
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline]
watchdog+0xf3f/0x1170 kernel/hung_task.c:495
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x672/0x7d0 arch/x86/kernel/process.c:158
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: 37 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: 0x0 (events_unbound)
RIP: 0010:check_preemption_disabled+0x2/0xe0 lib/smp_processor_id.c:13
Code: 0f 65 8b 05 4c 24 3f 08 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 <55> 53 48 83 ec 08 65 8b 1d c5 e5 3e 08 65 8b 05 ba e5 3e 08 a9 ff
RSP: 0018:ffffc90000ad7960 EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8880b853a398 RCX: ffffc90000ad797c
RDX: 0000000000000000 RSI: ffffffff8dadcb18 RDI: ffffffff8bf1cfc0
RBP: 1ffff9200015af49 R08: 20fd2086fc07d626 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff818fb648
R13: 0000000000000087 R14: ffff88801ead0000 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888124adf000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005619fa38f660 CR3: 000000000e182000 CR4: 00000000003526f0
Call Trace:
lockdep_recursion_finish kernel/locking/lockdep.c:470 [inline]
lock_release+0x153/0x2f0 kernel/locking/lockdep.c:5891
__raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline]
_raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186
sched_balance_newidle+0x4f8/0x1470 kernel/sched/fair.c:12832
pick_next_task_fair+0x50/0x1010 kernel/sched/fair.c:8926
__pick_next_task+0xf1/0x6c0 kernel/sched/core.c:5969
pick_next_task kernel/sched/core.c:6067 [inline]
__schedule+0x5d3/0x5de0 kernel/sched/core.c:6870
__schedule_loop kernel/sched/core.c:7011 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7026
worker_thread+0x2e5/0xf10 kernel/workqueue.c:3442
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x672/0x7d0 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245