INFO: task syz-executor.1:6246 blocked for more than 143 seconds.
Not tainted 6.8.0-rc1-syzkaller-00311-g3a5879d495b2 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1 state:D stack:27984 pid:6246 tgid:6245 ppid:6103 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x4960 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6874
rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
__super_lock fs/super.c:56 [inline]
super_lock+0x196/0x400 fs/super.c:120
super_lock_excl fs/super.c:145 [inline]
grab_super+0xaf/0x370 fs/super.c:534
sget_fc+0x1fa/0x770 fs/super.c:793
vfs_get_super fs/super.c:1268 [inline]
get_tree_single+0x2f/0x140 fs/super.c:1300
vfs_get_tree+0x8c/0x2a0 fs/super.c:1784
vfs_cmd_create+0xe4/0x230 fs/fsopen.c:230
__do_sys_fsconfig fs/fsopen.c:476 [inline]
__se_sys_fsconfig+0x967/0xec0 fs/fsopen.c:349
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f488fa7cda9
RSP: 002b:00007f48908770c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af
RAX: ffffffffffffffda RBX: 00007f488fbabf80 RCX: 00007f488fa7cda9
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003
RBP: 00007f488fac947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f488fbabf80 R15: 00007ffe96da3758
Showing all locks held in the system:
5 locks held by kworker/u4:1/12:
1 lock held by khungtaskd/29:
#0: ffffffff8d92ef20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8d92ef20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8d92ef20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u5:0/51:
#0: ffff88802b699d38 ((wq_completion)hci6){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff88802b699d38 ((wq_completion)hci6){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc90000bbfd20 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc90000bbfd20 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#2: ffff88802b3e9060 (&hdev->req_lock){+.+.}-{3:3}, at: hci_cmd_sync_work+0x1e0/0x400 net/bluetooth/hci_sync.c:305
2 locks held by getty/4814:
#0: ffff8880298ec0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.2/30522:
1 lock held by syz-executor.3/30841:
#0: ffffffff8d9348b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:324 [inline]
#0: ffffffff8d9348b8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x46c/0x890 kernel/rcu/tree_exp.h:995
2 locks held by syz-executor.1/5757:
2 locks held by kworker/1:5/6234:
#0: ffff88801308a938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff88801308a938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc900099f7d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc900099f7d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
2 locks held by syz-executor.1/6246:
#0: ffff88807b538c70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
#0: ffff88807b538c70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
2 locks held by syz-executor.1/6536:
#0: ffff888021ff1070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
#0: ffff888021ff1070 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
2 locks held by syz-executor.1/6928:
#0: ffff888078a1fc70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline]
#0: ffff888078a1fc70 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#1: ffff888023b260e0 (&type->s_umount_key#132){+.+.}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120
5 locks held by syz-executor.0/7732:
1 lock held by syz-executor.2/7749:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc1-syzkaller-00311-g3a5879d495b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2d3/0x370 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5757 Comm: syz-executor.1 Not tainted 6.8.0-rc1-syzkaller-00311-g3a5879d495b2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:mark_held_locks kernel/locking/lockdep.c:4266 [inline]
RIP: 0010:__trace_hardirqs_on_caller kernel/locking/lockdep.c:4292 [inline]
RIP: 0010:lockdep_hardirqs_on_prepare+0x26e/0x780 kernel/locking/lockdep.c:4359
Code: 49 83 fd 31 0f 83 a5 00 00 00 4c 89 e0 48 c1 e8 03 0f b6 04 10 84 c0 75 54 8b 43 20 a9 00 00 04 00 74 2c 31 d2 a9 00 00 03 00 <0f> 94 c2 83 f2 03 48 8b 7c 24 10 48 89 de e8 2f a8 00 00 48 ba 00
RSP: 0018:ffffc9000339f9c0 EFLAGS: 00000046
RAX: 0000000000040cb5 RBX: ffff8880213a8ae8 RCX: ffffffff816dfaea
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90df9568
RBP: ffffc9000339fa68 R08: ffffffff90df956f R09: 1ffffffff21bf2ad
R10: dffffc0000000000 R11: fffffbfff21bf2ae R12: ffff8880213a8b08
R13: 0000000000000001 R14: ffff8880213a8ab8 R15: 1ffff11004275157
FS: 00005555559bd480(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6061fad988 CR3: 0000000059a92000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_hardirqs_on+0x28/0x40 kernel/trace/trace_preemptirq.c:61
seqcount_lockdep_reader_access include/linux/seqlock.h:74 [inline]
read_seqbegin+0x155/0x250 include/linux/seqlock.h:772
read_seqbegin_or_lock include/linux/seqlock.h:1076 [inline]
d_walk+0x4f/0x700 fs/dcache.c:1231
shrink_dcache_parent+0x144/0x3b0 fs/dcache.c:1487
do_one_tree+0x23/0xe0 fs/dcache.c:1538
shrink_dcache_for_umount+0x7d/0x130 fs/dcache.c:1555
generic_shutdown_super+0x6a/0x2c0 fs/super.c:624
kill_anon_super fs/super.c:1230 [inline]
kill_litter_super+0x76/0xb0 fs/super.c:1240
gadgetfs_kill_sb+0x26/0x110 drivers/usb/gadget/legacy/inode.c:2111
deactivate_locked_super+0xc1/0x130 fs/super.c:477
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x24a/0x300 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x167/0x370 kernel/entry/common.c:212
do_syscall_64+0x102/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f835c27bc9a
Code: 48 3d 00 f0 ff ff 77 48 c3 0f 1f 80 00 00 00 00 48 83 ec 18 89 7c 24 0c e8 03 7f 02 00 8b 7c 24 0c 89 c2 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 36 89 d7 89 44 24 0c e8 63 7f 02 00 8b 44 24
RSP: 002b:00007fff7c7adc80 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000005 RCX: 00007f835c27bc9a
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000032 R08: 0000001b2d020000 R09: 0000000000000019
R10: 0000000081c0e901 R11: 0000000000000293 R12: 00007f835be00240
R13: ffffffffffffffff R14: 00007f835be00000 R15: 0000000000191377