INFO: task syz.4.156:6889 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-04744-gbdf56c7580d2 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.156 state:D stack:20016 pid:6889 tgid:6838 ppid:6100 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 io_schedule+0x8d/0x110 kernel/sched/core.c:7401 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189 __filemap_fdatawait_range+0x181/0x410 mm/filemap.c:532 filemap_write_and_wait_range+0x1e9/0x290 mm/filemap.c:694 bch2_rename2+0x217/0x1ac0 fs/bcachefs/fs.c:686 vfs_rename+0xbdb/0xf00 fs/namei.c:5013 do_renameat2+0xd94/0x13f0 fs/namei.c:5170 __do_sys_rename fs/namei.c:5217 [inline] __se_sys_rename fs/namei.c:5215 [inline] __x64_sys_rename+0x82/0x90 fs/namei.c:5215 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: 0033:0x7f0258f7def9 RSP: 002b:00007f02589ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052 RAX: ffffffffffffffda RBX: 00007f0259136058 RCX: 00007f0258f7def9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000020000000 RBP: 00007f0258ff0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0259136058 R15: 00007fff90c5d508 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: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 1 lock held by khungtaskd/30: #0: ffffffff8e938aa0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e938aa0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e938aa0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 2 locks held by kworker/u8:4/61: 3 locks held by kworker/u8:7/1301: #0: ffff88814b0f1148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88814b0f1148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc900045afd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900045afd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xd0/0x16f0 net/ipv6/addrconf.c:4196 1 lock held by dhcpcd/4887: #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643 2 locks held by getty/4971: #0: ffff88802f0a20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:3/5221: 2 locks held by kworker/0:5/5267: 1 lock held by syz.4.156/6841: #0: ffff8880616a8420 (sb_writers#35){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff8880616a8420 (sb_writers#35){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062 4 locks held by syz.4.156/6889: #0: ffff8880616a8420 (sb_writers#35){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff888060130148 (&type->i_mutex_dir_key#24/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:850 [inline] #1: ffff888060130148 (&type->i_mutex_dir_key#24/1){+.+.}-{3:3}, at: lock_rename fs/namei.c:3161 [inline] #1: ffff888060130148 (&type->i_mutex_dir_key#24/1){+.+.}-{3:3}, at: do_renameat2+0x62c/0x13f0 fs/namei.c:5105 #2: ffff888060131008 (&sb->s_type->i_mutex_key#44){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #2: ffff888060131008 (&sb->s_type->i_mutex_key#44){+.+.}-{3:3}, at: lock_two_nondirectories+0xe1/0x170 fs/inode.c:1217 #3: ffff8880603088a8 (&sb->s_type->i_mutex_key#44/4){+.+.}-{3:3}, at: vfs_rename+0x6a2/0xf00 fs/namei.c:4984 3 locks held by bch-reclaim/loo/6868: 2 locks held by syz.0.226/7572: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.4.268/7887: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.3.273/8015: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 3 locks held by syz.4.304/8198: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88805b0842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #1: ffff88805b0842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #1: ffff88805b0842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3200 #2: ffff88805b0a6690 (&c->gc_lock){.+.+}-{3:3}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197 2 locks held by syz.3.315/8261: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.3.315/8262: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.3.315/8292: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.4.372/8633: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 1 lock held by syz-executor/8668: #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643 1 lock held by syz-executor/8705: #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643 2 locks held by syz.3.396/8710: #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff8880616a80e0 (&type->s_umount_key#123){.+.+}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff8880616a8938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 1 lock held by syz-executor/8721: #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6643 8 locks held by syz-executor/8798: #0: ffff88802cf8c420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff88802cf8c420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 #1: ffff888032925088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1ea/0x500 fs/kernfs/file.c:325 #2: ffff8880278e7e18 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20e/0x500 fs/kernfs/file.c:326 #3: ffffffff8f54c0c8 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 #4: ffff888054b560e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff888054b560e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff888054b560e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292 #5: ffff888054b57250 (&devlink->lock_key#29){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672 #6: ffffffff8fcaf388 (rtnl_mutex){+.+.}-{3:3}, at: nsim_destroy+0x71/0x5c0 drivers/net/netdevsim/netdev.c:773 #7: ffffffff8e93e038 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #7: ffffffff8e93e038 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-04744-gbdf56c7580d2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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: 3447 Comm: kworker/u8:10 Not tainted 6.11.0-syzkaller-04744-gbdf56c7580d2 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:lockdep_softirqs_on+0x8/0x5a0 kernel/locking/lockdep.c:4518 Code: 48 c7 c7 70 d2 1a 90 e8 d6 51 88 00 e9 23 fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 48 89 e5 <41> 57 41 56 41 55 41 54 53 48 83 e4 e0 48 81 ec 80 00 00 00 49 89 RSP: 0018:ffffc9000aef79f0 EFLAGS: 00000046 RAX: 0000000000000200 RBX: 1ffff920015def44 RCX: ffffffff819b2cbc RDX: 0000000000000000 RSI: ffffffff8c5fda60 RDI: ffffffff8b7f7b72 RBP: ffffc9000aef79f0 R08: ffffffff901aa02f R09: 1ffffffff2035405 R10: dffffc0000000000 R11: fffffbfff2035406 R12: dffffc0000000000 R13: 1ffff920015def48 R14: ffffc9000aef7a40 R15: 0000000000000201 FS: 0000000000000000(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0409f8f866 CR3: 000000007f07e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __local_bh_enable_ip+0x123/0x200 kernel/softirq.c:370 spin_unlock_bh include/linux/spinlock.h:396 [inline] batadv_nc_purge_paths+0x312/0x3b0 net/batman-adv/network-coding.c:471 batadv_nc_worker+0x328/0x610 net/batman-adv/network-coding.c:720 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 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