INFO: task syz-executor:5848 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 state:D stack:22488 pid:5848 tgid:5848 ppid:1 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
netfs_wait_for_outstanding_io include/linux/netfs.h:552 [inline]
v9fs_evict_inode+0x26f/0x300 fs/9p/vfs_inode.c:348
evict+0x3e3/0x920 fs/inode.c:810
iput_final fs/inode.c:1897 [inline]
iput fs/inode.c:1923 [inline]
iput+0x521/0x880 fs/inode.c:1909
dentry_unlink_inode+0x29c/0x480 fs/dcache.c:466
__dentry_kill+0x1d0/0x600 fs/dcache.c:669
dput.part.0+0x4b1/0x9b0 fs/dcache.c:911
dput fs/dcache.c:901 [inline]
do_one_tree fs/dcache.c:1607 [inline]
shrink_dcache_for_umount+0x159/0x3e0 fs/dcache.c:1621
generic_shutdown_super+0x6c/0x390 fs/super.c:621
kill_anon_super+0x3a/0x60 fs/super.c:1282
v9fs_kill_super+0x3d/0xa0 fs/9p/vfs_super.c:195
deactivate_locked_super+0xc1/0x1a0 fs/super.c:474
deactivate_super fs/super.c:507 [inline]
deactivate_super+0xde/0x100 fs/super.c:503
cleanup_mnt+0x225/0x450 fs/namespace.c:1375
task_work_run+0x150/0x240 kernel/task_work.c:227
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43
exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
do_syscall_64+0x41c/0x4e0 arch/x86/entry/syscall_64.c:100
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc77c38ff57
RSP: 002b:00007ffc47978778 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007fc77c411c2d RCX: 00007fc77c38ff57
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc47978830
RBP: 00007ffc47978830 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc479798c0
R13: 00007fc77c411c2d R14: 000000000005657c R15: 00007ffc47979900
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
#0: ffff88801b881148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc90000117d10 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:303
1 lock held by khungtaskd/31:
#0: ffffffff8e5c15a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c15a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c15a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
4 locks held by kworker/u8:5/1107:
#0: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:644 [inline]
#0: ffff8880b843a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:629
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline]
#1: ffff8880b8424088 (psi_seq){-.-.}-{0:0}, at: __schedule+0x1861/0x5de0 kernel/sched/core.c:6955
#2: ffff8880b8425b18 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x6b8/0xd30 kernel/time/timer.c:1117
#3: ffffffff9b0fef88 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x14c/0x4c0 lib/debugobjects.c:818
2 locks held by getty/5606:
#0: ffff888035f9e0a0 (&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/5848:
#0: ffff88802b8ae0e0 (&type->s_umount_key#77){+.+.}-{4:4}, at: __super_lock fs/super.c:57 [inline]
#0: ffff88802b8ae0e0 (&type->s_umount_key#77){+.+.}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline]
#0: ffff88802b8ae0e0 (&type->s_umount_key#77){+.+.}-{4:4}, at: deactivate_super fs/super.c:506 [inline]
#0: ffff88802b8ae0e0 (&type->s_umount_key#77){+.+.}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:503
2 locks held by syz.1.1252/11433:
#0: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:634 [inline]
#0: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3433
#1: ffffffff8e5ccb38 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x284/0x3c0 kernel/rcu/tree_exp.h:311
1 lock held by syz.3.1256/11457:
#0: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x255/0x48b0 drivers/net/tun.c:3075
2 locks held by syz.6.1259/11463:
#0: ffffffff8f7a53c8 (ppp_mutex){+.+.}-{4:4}, at: ppp_ioctl+0xc2/0x2670 drivers/net/ppp/ppp_generic.c:734
#1: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: ppp_create_interface drivers/net/ppp/ppp_generic.c:3365 [inline]
#1: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:1065 [inline]
#1: ffffffff90385548 (rtnl_mutex){+.+.}-{4:4}, at: ppp_ioctl+0x17cd/0x2670 drivers/net/ppp/ppp_generic.c:738
1 lock held by syz.6.1259/11466:
#0: ffffffff8f7a53c8 (ppp_mutex){+.+.}-{4:4}, at: ppp_ioctl+0xc2/0x2670 drivers/net/ppp/ppp_generic.c:734
=============================================
NMI backtrace for cpu 1
CPU: 1 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:328 [inline]
watchdog+0xf0e/0x1260 kernel/hung_task.c:491
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x56a/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 11462 Comm: syz.6.1259 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:__hrtimer_setup+0x2/0x280 kernel/time/hrtimer.c:1594
Code: 90 90 90 90 90 90 90 90 f3 0f 1e fa e8 17 66 13 00 31 ff e9 40 cd 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 57 <41> 56 49 89 f6 41 55 41 89 d5 41 54 41 89 cc 55 44 89 e5 53 83 e5
RSP: 0018:ffffc90003cbfd38 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff92000797fa9 RCX: 0000000000000001
RDX: 0000000000000000 RSI: ffffffff81a83a10 RDI: ffffc90003cbfd78
RBP: ffffc90003cbfd78 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000001 R14: 00000000000f4240 R15: dffffc0000000000
FS: 0000555570428500(0000) GS:ffff8881246b2000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555585a425c8 CR3: 000000001f72e000 CR4: 00000000003526f0
DR0: 0000000000000008 DR1: 0000000000000002 DR2: 0000000000000081
DR3: ffffffffefffff18 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
__hrtimer_setup_sleeper kernel/time/hrtimer.c:2054 [inline]
hrtimer_setup_sleeper_on_stack kernel/time/hrtimer.c:2068 [inline]
hrtimer_nanosleep+0xc3/0x380 kernel/time/hrtimer.c:2145
common_nsleep+0xa1/0xd0 kernel/time/posix-timers.c:1353
__do_sys_clock_nanosleep kernel/time/posix-timers.c:1399 [inline]
__se_sys_clock_nanosleep kernel/time/posix-timers.c:1376 [inline]
__x64_sys_clock_nanosleep+0x34a/0x4a0 kernel/time/posix-timers.c:1376
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4e0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f43d7dc14e5
Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 f6 54 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 4f 55 ff ff 48 8b 04 24 48 83 c4 28 f7 d8
RSP: 002b:00007ffc8a231650 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6
RAX: ffffffffffffffda RBX: 00007f43d7fd5fa0 RCX: 00007f43d7dc14e5
RDX: 00007ffc8a231690 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f43d7fd7da0 R08: 0000000000000000 R09: 00007f43d8be2000
R10: 0000000000000000 R11: 0000000000000293 R12: 000000000007e3ff
R13: 00007f43d7fd6180 R14: ffffffffffffffff R15: 00007ffc8a2317d0