INFO: task syz.4.2362:16364 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.2362 state:D stack:28728 pid:16364 tgid:16357 ppid:11827 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5520 [inline]
__schedule+0x1259/0x6920 kernel/sched/core.c:7270
__schedule_loop kernel/sched/core.c:7347 [inline]
schedule+0xdd/0x2c0 kernel/sched/core.c:7362
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7419
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0xcbf/0x1bc0 kernel/locking/mutex.c:821
tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
chrdev_open+0x234/0x6a0 fs/char_dev.c:411
do_dentry_open+0x6ab/0x14d0 fs/open.c:996
vfs_open+0x82/0x3f0 fs/open.c:1101
do_open fs/namei.c:4837 [inline]
path_openat+0x19fa/0x2440 fs/namei.c:5000
do_file_open+0x20e/0x430 fs/namei.c:5029
do_sys_openat2+0x10f/0x1e0 fs/open.c:1417
do_sys_open fs/open.c:1423 [inline]
__do_sys_openat fs/open.c:1439 [inline]
__se_sys_openat fs/open.c:1434 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1434
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6c9155e90e
RSP: 002b:00007f6c8f7d4b28 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f6c8f7d56c0 RCX: 00007f6c9155e90e
RDX: 0000000000000002 RSI: 00007f6c8f7d4c00 RDI: ffffffffffffff9c
RBP: 00007f6c91635024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6c91826128 R14: 00007f6c91826090 R15: 00007fffc67ff5a8
Showing all locks held in the system:
locks held by khungtaskd/31: 1, last CPU#0:
#0: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#0: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6793
locks held by kworker/u8:3/49: 3, last CPU#0:
#0: ffff88801c08c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc90000b97d08 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
#2: ffffffff90cc4740 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0x51/0xc0 net/core/link_watch.c:313
locks held by kworker/u8:7/438: 2, last CPU#0:
#0: ffff888029db3940 ((wq_completion)wg-kex-wg1#57){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc90003117d08 ((work_completion)(&peer->transmit_handshake_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
locks held by getty/5355: 2, on CPU#1:
#0: ffff888037bfd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x14e0 drivers/tty/n_tty.c:2211
locks held by kworker/0:6/5732: 3, last CPU#0:
#0: ffff88801c057140 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc90004aa7d08 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
#2: ffff88807f3d3250 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1b8/0x6330 drivers/net/netdevsim/fib.c:1490
locks held by kworker/u8:16/8855: 3, last CPU#0:
#0: ffff88801c08c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc90005167d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
#2: ffff88805211f258 (&devlink->lock_key#36){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/0:9/10926: 5, on CPU#0:
#0: ffff8880232f4140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc900057afd08 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
#2: ffff888027fd71d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
#2: ffff888027fd71d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x1bb/0x4420 drivers/usb/core/hub.c:5907
#3: ffff88804d2081d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
#3: ffff88804d2081d8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1073
#4: ffff88807e8d21a0 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
#4: ffff88807e8d21a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x7e/0x4d0 drivers/base/dd.c:1073
locks held by kworker/0:10/11651: 2, last CPU#0:
#0: ffff888054f54d40 ((wq_completion)wg-crypt-wg0#32){+.+.}-{0:0}, at: process_one_work+0x1466/0x1b10 kernel/workqueue.c:3362
#1: ffffc90005647d08 ((work_completion)(&peer->transmit_packet_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3363
locks held by syz.2.1522/12889: 1, last CPU#0:
#0: ffff88808c5b4690 (&ima_iint_mutex_key[depth]#2){+.+.}-{4:4}, at: process_measurement+0x5ab/0x2350 security/integrity/ima/ima_main.c:319
locks held by syz.9.2356/16332: 4, last CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
#1: ffff888025dd61b0 (&tty->legacy_mutex){+.+.}-{4:4}, at: tty_init_dev.part.0+0x39/0x470 drivers/tty/tty_io.c:1379
#2: ffffffff8edd6040 (console_lock){+.+.}-{0:0}, at: class_console_lock_constructor include/linux/console.h:734 [inline]
#2: ffffffff8edd6040 (console_lock){+.+.}-{0:0}, at: con_install+0x99/0x620 drivers/tty/vt/vt.c:3743
#3: ffffffff8edd60b8 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
#3: ffffffff8edd60b8 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
#3: ffffffff8edd60b8 (console_srcu){....}-{0:0}, at: console_srcu_read_lock kernel/printk/printk.c:291 [inline]
#3: ffffffff8edd60b8 (console_srcu){....}-{0:0}, at: console_flush_one_record+0xfd/0xf10 kernel/printk/printk.c:3246
locks held by syz.4.2362/16364: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.1.2450/16761: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.3.2472/17145: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.8.2468/17153: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.5.2528/17590: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.6.2540/17653: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.2.2576/17900: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.9.2600/18125: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.1.2605/18339: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz.7.2636/18342: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open_by_driver drivers/tty/tty_io.c:2010 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: tty_open+0x425/0xe20 drivers/tty/tty_io.c:2093
locks held by syz-executor/18476: 1, last CPU#0:
#0: ffffffff90cc4740 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:134 [inline]
#0: ffffffff90cc4740 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_newaddr+0x31c/0x18c0 net/ipv4/devinet.c:978
locks held by syz.4.2696/18618: 1, on CPU#0:
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: class_mutex_constructor include/linux/mutex.h:253 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: ptmx_open drivers/tty/pty.c:800 [inline]
#0: ffffffff8fba5f60 (tty_mutex){+.+.}-{4:4}, at: ptmx_open+0x11a/0x360 drivers/tty/pty.c:767
locks held by syz.8.2697/18631: 2, last CPU#0:
#0: ffff888020fb5cf8 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
#0: ffff888020fb5cf8 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x124/0xa00 mm/mmap.c:1299
#1: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
#1: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#1: ffffffff8ede9de0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290
locks held by syz.0.2700/18637: 1, on CPU#0:
#0: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#0: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
locks held by syz.0.2700/18638: 1, last CPU#0:
#0: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
#0: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: __mm_populate+0x229/0x3a0 mm/gup.c:1942
locks held by syz.0.2700/18639: 2, on CPU#0:
#0: ffffffff8ef3a830 (dup_mmap_sem){++++}-{0:0}, at: dup_mm kernel/fork.c:1542 [inline]
#0: ffffffff8ef3a830 (dup_mmap_sem){++++}-{0:0}, at: copy_mm kernel/fork.c:1595 [inline]
#0: ffffffff8ef3a830 (dup_mmap_sem){++++}-{0:0}, at: copy_process+0x4815/0x8370 kernel/fork.c:2307
#1: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
#1: ffff888027ca9078 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x127/0x2370 mm/mmap.c:1716
locks held by syz.0.2700/18643: 2, last CPU#0:
#0: ffff888032f92460 (sb_writers#6){.+.+}-{0:0}, at: get_signal+0x1f2a/0x21e0 kernel/signal.c:3024
#1: ffff88807dfdef18 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: inode_lock include/linux/fs.h:1025 [inline]
#1: ffff88807dfdef18 (&sb->s_type->i_mutex_key#15){++++}-{4:4}, at: shmem_file_write_iter+0x86/0x140 mm/shmem.c:3419
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x141/0x190 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xcb1/0x1030 kernel/hung_task.c:561
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245