INFO: task syz.0.54:5661 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.54 state:D stack:22424 pid:5661 tgid:5632 ppid:5216 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6674 __schedule_loop kernel/sched/core.c:6751 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6766 io_schedule+0x8d/0x110 kernel/sched/core.c:7551 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189 truncate_inode_pages_range+0xafd/0xfc0 mm/truncate.c:398 truncate_inode_pages mm/truncate.c:423 [inline] truncate_pagecache mm/truncate.c:727 [inline] truncate_setsize+0xcf/0xf0 mm/truncate.c:752 bchfs_truncate+0x6aa/0xc70 fs/bcachefs/fs-io.c:460 notify_change+0xbca/0xe90 fs/attr.c:503 do_truncate+0x220/0x310 fs/open.c:65 handle_truncate fs/namei.c:3395 [inline] do_open fs/namei.c:3778 [inline] path_openat+0x2e1e/0x3590 fs/namei.c:3933 do_filp_open+0x235/0x490 fs/namei.c:3960 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415 do_sys_open fs/open.c:1430 [inline] __do_sys_openat fs/open.c:1446 [inline] __se_sys_openat fs/open.c:1441 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1441 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: 0033:0x7f2ee7f7def9 RSP: 002b:00007f2ee8d51038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f2ee8136058 RCX: 00007f2ee7f7def9 RDX: 0000000000040282 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007f2ee7ff0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2ee8136058 R15: 00007ffe653a3378 Showing all locks held in the system: 3 locks held by kworker/u8:1/12: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000117d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000117d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb97c8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 1 lock held by khungtaskd/30: #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 2 locks held by kworker/u8:10/3051: 2 locks held by getty/4974: #0: ffff88814c62a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:4/5267: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90004027d00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90004027d00 (free_ipc_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #2: ffffffff8e93d478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 1 lock held by syz.0.54/5633: #0: ffff888021f16420 (sb_writers#27){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff888021f16420 (sb_writers#27){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 2 locks held by syz.0.54/5661: #0: ffff888021f16420 (sb_writers#27){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff888060009ec8 (&sb->s_type->i_mutex_key#34){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff888060009ec8 (&sb->s_type->i_mutex_key#34){+.+.}-{3:3}, at: do_truncate+0x20c/0x310 fs/open.c:63 1 lock held by syz.0.54/5662: #0: ffff888021f16420 (sb_writers#27){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff888021f16420 (sb_writers#27){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062 1 lock held by bch-reclaim/loo/5651: 2 locks held by syz.3.44/5844: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 1 lock held by syz-executor/5948: 2 locks held by syz.2.99/6159: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.0.134/6435: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.2.166/6666: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 3 locks held by syz.0.202/6915: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88806fe042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #1: ffff88806fe042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #1: ffff88806fe042c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3200 #2: ffff88806fe26690 (&c->gc_lock){.+.+}-{3:3}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197 2 locks held by syz.1.204/6923: #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff888021f160e0 (&type->s_umount_key#101){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff888021f16938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 7 locks held by syz-executor/6973: #0: ffff88802e010420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff88802e010420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 #1: ffff888069d3c888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325 #2: ffff8881437644b8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326 #3: ffffffff8f5571e8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 #4: ffff88803105f0e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #4: ffff88803105f0e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff88803105f0e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292 #5: ffff88805bc22250 (&devlink->lock_key#16){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672 #6: ffffffff8fcb97c8 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773 4 locks held by syz-executor/6992: #0: ffff88802e010420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff88802e010420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 #1: ffff888046ea4888 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325 #2: ffff8881437644b8 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326 #3: ffffffff8f5571e8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 3 locks held by syz.2.231/7037: #0: ffff8880514c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_dev_do_close net/bluetooth/hci_core.c:481 [inline] #0: ffff8880514c4d80 (&hdev->req_lock){+.+.}-{3:3}, at: hci_unregister_dev+0x203/0x510 net/bluetooth/hci_core.c:2698 #1: ffff8880514c4078 (&hdev->lock){+.+.}-{3:3}, at: hci_dev_close_sync+0x572/0x11a0 net/bluetooth/hci_sync.c:5183 #2: ffffffff8fe25fa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_disconn_cfm include/net/bluetooth/hci_core.h:1972 [inline] #2: ffffffff8fe25fa8 (hci_cb_list_lock){+.+.}-{3:3}, at: hci_conn_hash_flush+0xa6/0x240 net/bluetooth/hci_conn.c:2589 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 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:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5651 Comm: bch-reclaim/loo Not tainted 6.11.0-syzkaller-08833-gde5cb0dcb74c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:hlock_class kernel/locking/lockdep.c:228 [inline] RIP: 0010:check_wait_context kernel/locking/lockdep.c:4824 [inline] RIP: 0010:__lock_acquire+0x5e7/0x2050 kernel/locking/lockdep.c:5149 Code: 41 8b 1f 81 e3 ff 1f 00 00 48 89 d8 48 c1 e8 06 48 8d 3c c5 c0 57 22 94 be 08 00 00 00 e8 01 25 8b 00 48 0f a3 1d 49 30 b2 12 <73> 26 48 69 c3 c8 00 00 00 48 8d 98 c0 d6 be 93 48 ba 00 00 00 00 RSP: 0018:ffffc900031df0f0 EFLAGS: 00000057 RAX: 0000000000000001 RBX: 0000000000000aa7 RCX: ffffffff8170276f RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff94225910 RBP: 0000000000000000 R08: ffffffff94225917 R09: 1ffffffff2844b22 R10: dffffc0000000000 R11: fffffbfff2844b23 R12: ffff88803245bc00 R13: 0000000000000aa7 R14: 1ffff1100648b8ea R15: ffff88803245c750 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f21e92656c0 CR3: 000000000e734000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822 trans_set_locked fs/bcachefs/btree_locking.h:194 [inline] bch2_trans_begin+0x9bd/0x1a50 fs/bcachefs/btree_iter.c:3097 bch2_btree_write_buffer_flush_locked+0x15e/0x59f0 fs/bcachefs/btree_write_buffer.c:281 btree_write_buffer_flush_seq+0x1a43/0x1bc0 fs/bcachefs/btree_write_buffer.c:510 bch2_btree_write_buffer_journal_flush+0x4e/0x80 fs/bcachefs/btree_write_buffer.c:525 journal_flush_pins+0x5f7/0xb20 fs/bcachefs/journal_reclaim.c:565 __bch2_journal_reclaim+0x77d/0xe40 fs/bcachefs/journal_reclaim.c:697 bch2_journal_reclaim_thread+0x174/0x560 fs/bcachefs/journal_reclaim.c:739 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244