INFO: task syz.4.4874:25506 blocked for more than 143 seconds. Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.4874 state:D stack:17920 pid:25506 tgid:25505 ppid:24514 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578 __super_lock fs/super.c:56 [inline] __super_lock_excl fs/super.c:71 [inline] deactivate_super+0xb5/0xf0 fs/super.c:505 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x251/0x310 kernel/task_work.c:239 exit_task_work include/linux/task_work.h:43 [inline] do_exit+0xa2a/0x28e0 kernel/exit.c:938 do_group_exit+0x207/0x2c0 kernel/exit.c:1087 get_signal+0x16b2/0x1750 kernel/signal.c:3017 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fed7fb85d29 RSP: 002b:00007fed80a88038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: fffffffffffffe00 RBX: 00007fed7fd75fa0 RCX: 00007fed7fb85d29 RDX: 0000000020000100 RSI: 00000000200000c0 RDI: 0000000000000000 RBP: 00007fed7fc01b08 R08: 0000000020000140 R09: 0000000000000000 R10: 0000000000000802 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fed7fd75fa0 R15: 00007ffdd9c24548 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 6 locks held by kworker/1:2/1204: #0: ffff8880212a2948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff8880212a2948 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc90004687d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90004687d00 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 #2: ffff888028e77190 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1014 [inline] #2: ffff888028e77190 (&dev->mutex){....}-{4:4}, at: hub_event+0x1fe/0x5150 drivers/usb/core/hub.c:5849 #3: ffff888144f62510 (&port_dev->status_lock){+.+.}-{4:4}, at: usb_lock_port drivers/usb/core/hub.c:3206 [inline] #3: ffff888144f62510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5418 [inline] #3: ffff888144f62510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] #3: ffff888144f62510 (&port_dev->status_lock){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5821 [inline] #3: ffff888144f62510 (&port_dev->status_lock){+.+.}-{4:4}, at: hub_event+0x25b9/0x5150 drivers/usb/core/hub.c:5903 #4: ffff888028bcd668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect drivers/usb/core/hub.c:5419 [inline] #4: ffff888028bcd668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_port_connect_change drivers/usb/core/hub.c:5661 [inline] #4: ffff888028bcd668 (hcd->address0_mutex){+.+.}-{4:4}, at: port_event drivers/usb/core/hub.c:5821 [inline] #4: ffff888028bcd668 (hcd->address0_mutex){+.+.}-{4:4}, at: hub_event+0x25f7/0x5150 drivers/usb/core/hub.c:5903 #5: ffffffff8f58f590 (ehci_cf_port_reset_rwsem){.+.+}-{4:4}, at: hub_port_reset+0x1f8/0x1b30 drivers/usb/core/hub.c:3021 3 locks held by kworker/u8:8/3464: #0: ffff88814329c148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88814329c148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc9000ca8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000ca8fd00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 #2: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562 2 locks held by syslogd/5183: #0: ffff8880b863e8d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606 #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: __bpf_trace_run kernel/trace/bpf_trace.c:2361 [inline] #1: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: bpf_trace_run4+0x244/0x590 kernel/trace/bpf_trace.c:2405 1 lock held by klogd/5190: 2 locks held by getty/5587: #0: ffff88814be190a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fd62f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 1 lock held by syz.4.4874/25506: #0: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 4 locks held by bch-reclaim/loo/25534: #0: ffff888092e4b0a8 (&j->reclaim_lock){+.+.}-{4:4}, at: bch2_journal_reclaim_thread+0x167/0x560 fs/bcachefs/journal_reclaim.c:739 #1: ffff888092e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:158 [inline] #1: ffff888092e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:249 [inline] #1: ffff888092e04398 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7e1/0xd30 fs/bcachefs/btree_iter.c:3228 #2: ffff888092e04740 (&wb->flushing.lock){+.+.}-{4:4}, at: btree_write_buffer_flush_seq+0x1b19/0x1cc0 fs/bcachefs/btree_write_buffer.c:516 #3: ffff888092e266d0 (&c->gc_lock){++++}-{4:4}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197 3 locks held by kworker/u8:15/26139: 2 locks held by kworker/u8:24/26149: 1 lock held by syz.5.5082/26427: #0: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88806ce840e0 (&type->s_umount_key#79){++++}-{4:4}, at: super_lock+0x27c/0x400 fs/super.c:120 2 locks held by syz.6.5364/27652: 1 lock held by syz.1.5379/27717: #0: ffff8880328b9f20 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:122 [inline] #0: ffff8880328b9f20 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x17c/0x3d0 mm/util.c:578 2 locks held by syz.1.5379/27718: 2 locks held by syz.0.5380/27723: 1 lock held by syz.0.5380/27725: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0xff6/0x1040 kernel/hung_task.c:397 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 26636 Comm: syz-executor Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__do_sys_wait4 kernel/exit.c:1880 [inline] RIP: 0010:__se_sys_wait4 kernel/exit.c:1874 [inline] RIP: 0010:__x64_sys_wait4+0x137/0x1e0 kernel/exit.c:1874 Code: 00 31 ff 48 89 de e8 18 1c 3e 00 48 85 db 4c 0f 44 fb 48 8b 7c 24 18 48 8b 74 24 10 44 89 ea 4c 89 f9 e8 2c f3 ff ff 49 89 c7 01 00 00 00 48 89 c6 e8 ec 1b 3e 00 48 85 db 74 37 4d 85 ff 7e RSP: 0018:ffffc9000d027d80 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff888062c25a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001 RBP: ffffc9000d027f00 R08: ffffffff816152b1 R09: 1ffffffff2032fce R10: dffffc0000000000 R11: fffffbfff2032fcf R12: 1ffff92001a04fb4 R13: 0000000040000001 R14: dffffc0000000000 R15: 0000000000000000 FS: 000055556b489500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd4336cbe8 CR3: 0000000037022000 CR4: 0000000000350ef0 Call Trace: do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f004977bf97 Code: 89 7c 24 10 48 89 4c 24 18 e8 45 1b 03 00 4c 8b 54 24 18 8b 54 24 14 41 89 c0 48 8b 74 24 08 8b 7c 24 10 b8 3d 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 89 44 24 10 e8 95 1b 03 00 8b 44 RSP: 002b:00007ffe309f70d0 EFLAGS: 00000293 ORIG_RAX: 000000000000003d RAX: ffffffffffffffda RBX: 00000000000000a6 RCX: 00007f004977bf97 RDX: 0000000040000001 RSI: 00007ffe309f712c RDI: 00000000ffffffff RBP: 00007ffe309f712c R08: 0000000000000000 R09: 7fffffffffffffff R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 000000000016e916 R14: 00007ffe309f7180 R15: 0000000000000bb8