===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Not tainted ----------------------------------------------------- syz-executor.4/6335 [HC0[0]:SC0[2]:HE0:SE0] is trying to acquire: ffff88807e527020 (&htab->buckets[i].lock){+...}-{2:2}, at: spin_lock_bh include/linux/spinlock.h:356 [inline] ffff88807e527020 (&htab->buckets[i].lock){+...}-{2:2}, at: sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 and this task is already holding: ffff8880b943d5d8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 which would create a new lock dependency: (&pool->lock){-.-.}-{2:2} -> (&htab->buckets[i].lock){+...}-{2:2} but this new dependency connects a HARDIRQ-irq-safe lock: (&pool->lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 queue_work_on+0xf4/0x120 kernel/workqueue.c:2435 tick_nohz_activate kernel/time/tick-sched.c:1491 [inline] tick_setup_sched_timer+0x47c/0x790 kernel/time/tick-sched.c:1592 hrtimer_switch_to_hres kernel/time/hrtimer.c:750 [inline] hrtimer_run_queues+0x33c/0x450 kernel/time/hrtimer.c:1918 run_local_timers kernel/time/timer.c:2453 [inline] update_process_times+0xcf/0x220 kernel/time/timer.c:2475 tick_periodic+0x7e/0x230 kernel/time/tick-common.c:100 tick_handle_periodic+0x45/0x120 kernel/time/tick-common.c:112 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:401 [inline] rcu_sync_dtor+0xb7/0x180 kernel/rcu/sync.c:184 percpu_free_rwsem kernel/locking/percpu-rwsem.c:42 [inline] percpu_free_rwsem+0x33/0xa0 kernel/locking/percpu-rwsem.c:33 destroy_super_work+0xf2/0x160 fs/super.c:281 destroy_unused_super fs/super.c:302 [inline] destroy_unused_super fs/super.c:293 [inline] sget+0x4da/0x760 fs/super.c:834 mount_single+0x39/0x200 fs/super.c:1742 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 fc_mount fs/namespace.c:1125 [inline] vfs_kern_mount.part.0+0xcf/0x170 fs/namespace.c:1155 vfs_kern_mount+0x3f/0x60 fs/namespace.c:1142 simple_pin_fs+0xf2/0x190 fs/libfs.c:1016 tracefs_start_creating+0x3b/0x2a0 fs/tracefs/inode.c:462 tracefs_create_file+0x9d/0x810 fs/tracefs/inode.c:567 trace_create_file+0x33/0x70 kernel/trace/trace.c:9167 event_trace_init+0xe5/0x1f0 kernel/trace/trace_events.c:4097 tracer_init_tracefs_work_func+0x12/0x3c0 kernel/trace/trace.c:10175 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 to a HARDIRQ-irq-unsafe lock: (&htab->buckets[i].lock){+...}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420 trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter+0x1c5/0x210 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0x1f6/0x260 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x6d/0x75 other info that might help us debug this: Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&htab->buckets[i].lock); local_irq_disable(); lock(&pool->lock); lock(&htab->buckets[i].lock); lock(&pool->lock); *** DEADLOCK *** 4 locks held by syz-executor.4/6335: #0: ffff88807c5ae0e0 (&type->s_umount_key#96){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807c5ae0e0 (&type->s_umount_key#96){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807c5ae0e0 (&type->s_umount_key#96){+.+.}-{3:3}, at: deactivate_super+0xd6/0x100 fs/super.c:504 #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #1: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __queue_work+0xf2/0x1170 kernel/workqueue.c:2324 #2: ffff8880b943d5d8 (&pool->lock){-.-.}-{2:2}, at: __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline] #3: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: bpf_trace_run1+0xdc/0x410 kernel/trace/bpf_trace.c:2419 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&pool->lock){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 queue_work_on+0xf4/0x120 kernel/workqueue.c:2435 tick_nohz_activate kernel/time/tick-sched.c:1491 [inline] tick_setup_sched_timer+0x47c/0x790 kernel/time/tick-sched.c:1592 hrtimer_switch_to_hres kernel/time/hrtimer.c:750 [inline] hrtimer_run_queues+0x33c/0x450 kernel/time/hrtimer.c:1918 run_local_timers kernel/time/timer.c:2453 [inline] update_process_times+0xcf/0x220 kernel/time/timer.c:2475 tick_periodic+0x7e/0x230 kernel/time/tick-common.c:100 tick_handle_periodic+0x45/0x120 kernel/time/tick-common.c:112 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline] __sysvec_apic_timer_interrupt+0x10f/0x410 arch/x86/kernel/apic/apic.c:1049 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:202 spin_unlock_irq include/linux/spinlock.h:401 [inline] rcu_sync_dtor+0xb7/0x180 kernel/rcu/sync.c:184 percpu_free_rwsem kernel/locking/percpu-rwsem.c:42 [inline] percpu_free_rwsem+0x33/0xa0 kernel/locking/percpu-rwsem.c:33 destroy_super_work+0xf2/0x160 fs/super.c:281 destroy_unused_super fs/super.c:302 [inline] destroy_unused_super fs/super.c:293 [inline] sget+0x4da/0x760 fs/super.c:834 mount_single+0x39/0x200 fs/super.c:1742 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1779 fc_mount fs/namespace.c:1125 [inline] vfs_kern_mount.part.0+0xcf/0x170 fs/namespace.c:1155 vfs_kern_mount+0x3f/0x60 fs/namespace.c:1142 simple_pin_fs+0xf2/0x190 fs/libfs.c:1016 tracefs_start_creating+0x3b/0x2a0 fs/tracefs/inode.c:462 tracefs_create_file+0x9d/0x810 fs/tracefs/inode.c:567 trace_create_file+0x33/0x70 kernel/trace/trace.c:9167 event_trace_init+0xe5/0x1f0 kernel/trace/trace_events.c:4097 tracer_init_tracefs_work_func+0x12/0x3c0 kernel/trace/trace.c:10175 process_one_work+0x9a9/0x1a60 kernel/workqueue.c:3254 process_scheduled_works kernel/workqueue.c:3335 [inline] worker_thread+0x6c8/0xf70 kernel/workqueue.c:3416 kthread+0x2c1/0x3a0 kernel/kthread.c:388 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 call_timer_fn+0x1a0/0x5b0 kernel/time/timer.c:1792 expire_timers kernel/time/timer.c:1838 [inline] __run_timers+0x567/0xab0 kernel/time/timer.c:2408 __run_timer_base kernel/time/timer.c:2419 [inline] __run_timer_base kernel/time/timer.c:2412 [inline] run_timer_base+0x111/0x190 kernel/time/timer.c:2428 run_timer_softirq+0x1a/0x40 kernel/time/timer.c:2438 __do_softirq+0x218/0x8de kernel/softirq.c:554 invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:633 [inline] irq_exit_rcu+0xb9/0x120 kernel/softirq.c:645 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline] arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline] default_idle+0xf/0x20 arch/x86/kernel/process.c:742 default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117 cpuidle_idle_call kernel/sched/idle.c:191 [inline] do_idle+0x32c/0x3f0 kernel/sched/idle.c:332 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430 rest_init+0x16f/0x2b0 init/main.c:730 arch_call_rest_init+0x13/0x40 init/main.c:831 start_kernel+0x3a3/0x490 init/main.c:1077 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:509 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:490 common_startup_64+0x13e/0x148 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 __queue_work+0x39e/0x1170 kernel/workqueue.c:2360 queue_work_on+0xf4/0x120 kernel/workqueue.c:2435 queue_work include/linux/workqueue.h:605 [inline] start_poll_synchronize_rcu_expedited+0x147/0x180 kernel/rcu/tree_exp.h:1017 rcu_init+0x1625/0x20c0 kernel/rcu/tree.c:5240 start_kernel+0x19e/0x490 init/main.c:969 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:509 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:490 common_startup_64+0x13e/0x148 } ... key at: [] __key.17+0x0/0x40 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (&htab->buckets[i].lock){+...}-{2:2} { HARDIRQ-ON-W at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420 trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter+0x1c5/0x210 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0x1f6/0x260 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x6d/0x75 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run2+0x151/0x420 kernel/trace/bpf_trace.c:2420 trace_sys_enter include/trace/events/syscalls.h:18 [inline] syscall_trace_enter+0x1c5/0x210 kernel/entry/common.c:61 syscall_enter_from_user_mode_work include/linux/entry-common.h:168 [inline] syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline] do_syscall_64+0x1f6/0x260 arch/x86/entry/common.c:79 entry_SYSCALL_64_after_hwframe+0x6d/0x75 } ... key at: [] __key.0+0x0/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run1+0x149/0x410 kernel/trace/bpf_trace.c:2419 __bpf_trace_workqueue_activate_work+0x98/0xd0 include/trace/events/workqueue.h:59 trace_workqueue_activate_work include/trace/events/workqueue.h:59 [inline] __queue_work+0xd0d/0x1170 kernel/workqueue.c:2399 queue_work_on+0xf4/0x120 kernel/workqueue.c:2435 queue_work include/linux/workqueue.h:605 [inline] schedule_work include/linux/workqueue.h:666 [inline] p9_fd_request+0x2f8/0x390 net/9p/trans_fd.c:692 p9_client_rpc+0x33d/0xc10 net/9p/client.c:703 p9_client_clunk+0x93/0x170 net/9p/client.c:1438 p9_fid_put include/net/9p/client.h:278 [inline] v9fs_dentry_release+0x12f/0x1d0 fs/9p/vfs_dentry.c:55 __dentry_kill+0x23b/0x600 fs/dcache.c:608 dput.part.0+0x4b1/0x9b0 fs/dcache.c:845 dput fs/dcache.c:835 [inline] do_one_tree fs/dcache.c:1541 [inline] shrink_dcache_for_umount+0x131/0x390 fs/dcache.c:1555 generic_shutdown_super+0x76/0x3d0 fs/super.c:619 kill_anon_super+0x3a/0x60 fs/super.c:1225 v9fs_kill_super+0x3d/0xa0 fs/9p/vfs_super.c:220 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 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+0x275/0x2a0 kernel/entry/common.c:212 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 stack backtrace: CPU: 0 PID: 6335 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_bad_irq_dependency kernel/locking/lockdep.c:2626 [inline] check_irq_usage+0xe3c/0x1490 kernel/locking/lockdep.c:2865 check_prev_add kernel/locking/lockdep.c:3138 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x248e/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x33/0x40 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] sock_hash_delete_elem+0xcb/0x260 net/core/sock_map.c:939 ___bpf_prog_run+0x3e51/0xae80 kernel/bpf/core.c:1997 __bpf_prog_run32+0xc1/0x100 kernel/bpf/core.c:2236 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline] __bpf_prog_run include/linux/filter.h:657 [inline] bpf_prog_run include/linux/filter.h:664 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline] bpf_trace_run1+0x149/0x410 kernel/trace/bpf_trace.c:2419 __bpf_trace_workqueue_activate_work+0x98/0xd0 include/trace/events/workqueue.h:59 trace_workqueue_activate_work include/trace/events/workqueue.h:59 [inline] __queue_work+0xd0d/0x1170 kernel/workqueue.c:2399 queue_work_on+0xf4/0x120 kernel/workqueue.c:2435 queue_work include/linux/workqueue.h:605 [inline] schedule_work include/linux/workqueue.h:666 [inline] p9_fd_request+0x2f8/0x390 net/9p/trans_fd.c:692 p9_client_rpc+0x33d/0xc10 net/9p/client.c:703 p9_client_clunk+0x93/0x170 net/9p/client.c:1438 p9_fid_put include/net/9p/client.h:278 [inline] v9fs_dentry_release+0x12f/0x1d0 fs/9p/vfs_dentry.c:55 __dentry_kill+0x23b/0x600 fs/dcache.c:608 dput.part.0+0x4b1/0x9b0 fs/dcache.c:845 dput fs/dcache.c:835 [inline] do_one_tree fs/dcache.c:1541 [inline] shrink_dcache_for_umount+0x131/0x390 fs/dcache.c:1555 generic_shutdown_super+0x76/0x3d0 fs/super.c:619 kill_anon_super+0x3a/0x60 fs/super.c:1225 v9fs_kill_super+0x3d/0xa0 fs/9p/vfs_super.c:220 deactivate_locked_super+0xbe/0x1a0 fs/super.c:472 deactivate_super+0xde/0x100 fs/super.c:505 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 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+0x275/0x2a0 kernel/entry/common.c:212 do_syscall_64+0xe2/0x260 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7f7afbe7f197 Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007ffddae36fa8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7afbe7f197 RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffddae37060 RBP: 00007ffddae37060 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffddae38120 R13: 00007f7afbec93b9 R14: 00000000000393d1 R15: 000000000000000d