INFO: task syz.8.691:12392 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.691 state:D stack:25384 pid:12392 tgid:12391 ppid:9789 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6781
__schedule_loop kernel/sched/core.c:6859 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6874
request_wait_answer fs/fuse/dev.c:564 [inline]
__fuse_request_send fs/fuse/dev.c:578 [inline]
__fuse_simple_request+0xf12/0x18d0 fs/fuse/dev.c:672
fuse_simple_request fs/fuse/fuse_i.h:1237 [inline]
fuse_lookup_name+0x34c/0x860 fs/fuse/dir.c:383
fuse_lookup+0x13e/0x5a0 fs/fuse/dir.c:426
lookup_one_qstr_excl_raw+0x118/0x280 fs/namei.c:1689
lookup_one_qstr_excl fs/namei.c:1711 [inline]
filename_create+0x225/0x470 fs/namei.c:4140
do_mknodat+0x184/0x4d0 fs/namei.c:4272
__do_sys_mknodat fs/namei.c:4313 [inline]
__se_sys_mknodat fs/namei.c:4310 [inline]
__x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4310
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: 0033:0x7f990578e969
RSP: 002b:00007f990661d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 00007f99059b5fa0 RCX: 00007f990578e969
RDX: 0000000000000008 RSI: 0000200000000980 RDI: ffffffffffffff9c
RBP: 00007f9905810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000008c R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f99059b5fa0 R15: 00007fffee578f58
INFO: task syz.8.691:12394 blocked for more than 144 seconds.
Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.691 state:D stack:25160 pid:12394 tgid:12391 ppid:9789 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6781
__schedule_loop kernel/sched/core.c:6859 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6874
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6931
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+0x1ab/0x1f0 kernel/locking/rwsem.c:1578
inode_lock include/linux/fs.h:867 [inline]
do_lock_mount+0x200/0x510 fs/namespace.c:2828
lock_mount fs/namespace.c:2873 [inline]
do_new_mount_fc fs/namespace.c:3793 [inline]
do_new_mount+0x389/0xa40 fs/namespace.c:3858
do_mount fs/namespace.c:4193 [inline]
__do_sys_mount fs/namespace.c:4404 [inline]
__se_sys_mount+0x317/0x410 fs/namespace.c:4381
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: 0033:0x7f990579010a
RSP: 002b:00007f99065fbe68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f99065fbef0 RCX: 00007f990579010a
RDX: 0000200000000100 RSI: 0000200000000f00 RDI: 00007f99065fbeb0
RBP: 0000200000000100 R08: 00007f99065fbef0 R09: 0000000000014444
R10: 0000000000014444 R11: 0000000000000246 R12: 0000200000000f00
R13: 00007f99065fbeb0 R14: 0000000000000c22 R15: 0000200000001140
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
4 locks held by kworker/u8:7/4578:
1 lock held by dhcpcd/5483:
#0: ffff8880b873b798 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:606
2 locks held by getty/5581:
#0: ffff88803570a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by kworker/1:3/5813:
3 locks held by syz.8.691/12392:
#0: ffff88807e762428 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff888054cb9e48 (&type->i_mutex_dir_key#27/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#1: ffff888054cb9e48 (&type->i_mutex_dir_key#27/1){+.+.}-{4:4}, at: filename_create+0x1f9/0x470 fs/namei.c:4139
#2: ffff888054cba310 (&fi->mutex){+.+.}-{4:4}, at: fuse_lock_inode+0xd3/0x120 fs/fuse/inode.c:590
1 lock held by syz.8.691/12394:
#0: ffff888054cb9e48 (&type->i_mutex_dir_key#27){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888054cb9e48 (&type->i_mutex_dir_key#27){+.+.}-{4:4}, at: do_lock_mount+0x200/0x510 fs/namespace.c:2828
2 locks held by dhcpcd/15238:
#0: ffff888054f25608 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline]
#0: ffff888054f25608 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff888054f25608 (&sb->s_type->i_mutex_key#10){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1391
#1: ffffffff8e142bb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:304 [inline]
#1: ffffffff8e142bb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f4/0x730 kernel/rcu/tree_exp.h:998
1 lock held by dhcpcd/15356:
#0: ffff888026272258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1667 [inline]
#0: ffff888026272258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x32/0xcd0 net/packet/af_packet.c:3252
1 lock held by sed/15360:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
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+0x711/0x8a0 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: 7983 Comm: kworker/1:10 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_power_efficient gc_worker
RIP: 0010:match_held_lock+0x2/0xc0 kernel/locking/lockdep.c:5308
Code: 41 5f e9 41 cb 02 00 cc e8 fb f8 ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 56 <53> bb 01 00 00 00 48 39 77 10 74 6a 81 7f 20 00 00 20 00 72 5f 48
RSP: 0018:ffffc9000475f7a8 EFLAGS: 00000083
RAX: 0000000000000002 RBX: ffff88802c852918 RCX: 593026400c7fd000
RDX: 0000000000000000 RSI: ffffffff8e13d140 RDI: ffff88802c852918
RBP: 00000000ffffffff R08: ffffffff8f9f92f7 R09: 1ffffffff1f3f25e
R10: dffffc0000000000 R11: fffffbfff1f3f25f R12: 0000000000000246
R13: ffff88802c851e00 R14: ffffffff8e13d140 R15: 0000000000000001
FS: 0000000000000000(0000) GS:ffff888125d95000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24e960ca90 CR3: 0000000041fc6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_is_held kernel/locking/lockdep.c:5604 [inline]
lock_is_held_type+0xa8/0x190 kernel/locking/lockdep.c:5943
lock_is_held include/linux/lockdep.h:249 [inline]
__might_resched+0xf5/0x610 kernel/sched/core.c:8757
gc_worker+0xbbe/0x1380 net/netfilter/nf_conntrack_core.c:1607
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
kthread+0x711/0x8a0 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