INFO: task syz-executor:4304 blocked for more than 143 seconds. Not tainted 6.1.135-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:4304 ppid:1 flags:0x00000009 Call trace: __switch_to+0x2f4/0x568 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5244 [inline] __schedule+0xdd4/0x1b2c kernel/sched/core.c:6561 schedule+0xc4/0x170 kernel/sched/core.c:6637 wb_wait_for_completion+0x150/0x298 fs/fs-writeback.c:191 sync_inodes_sb+0x188/0x824 fs/fs-writeback.c:2739 sync_filesystem+0x160/0x218 fs/sync.c:64 generic_shutdown_super+0x70/0x324 fs/super.c:474 kill_block_super+0x70/0xdc fs/super.c:1470 deactivate_locked_super+0xac/0x124 fs/super.c:332 deactivate_super+0xe8/0x108 fs/super.c:363 cleanup_mnt+0x37c/0x404 fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0x1ec/0x270 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x1f70/0x2b0c arch/arm64/kernel/signal.c:1137 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x98/0x138 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffff8000152476b0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 1 lock held by rcu_tasks_trace/13: #0: ffff800015247ed0 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xbb4 kernel/rcu/tasks.h:517 2 locks held by kworker/1:0/22: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff80001c8e7c20 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 1 lock held by khungtaskd/28: #0: ffff800015246d40 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 4 locks held by kworker/u4:3/176: #0: ffff0000c2e4d938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff8000207c7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff0000f67b6650 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1e0/0xd80 fs/xfs/libxfs/xfs_bmap.c:4512 #3: ffff0000f51f0118 (&xfs_nondir_ilock_class){++++}-{3:3}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline] #3: ffff0000f51f0118 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x210/0x484 fs/xfs/xfs_inode.c:211 4 locks held by kworker/u4:5/1590: #0: ffff0000c2e4d938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff8000253a7c20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff0000feb68650 (sb_internal#2){.+.+}-{0:0}, at: xfs_bmapi_convert_delalloc+0x1e0/0xd80 fs/xfs/libxfs/xfs_bmap.c:4512 #3: ffff0000f51f65d8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: mrupdate_nested fs/xfs/mrlock.h:36 [inline] #3: ffff0000f51f65d8 (&xfs_nondir_ilock_class){++++}-{3:3}, at: xfs_ilock+0x210/0x484 fs/xfs/xfs_inode.c:211 1 lock held by dhcpcd/3967: #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: __netlink_dump_start+0x104/0x6a4 net/netlink/af_netlink.c:2287 2 locks held by getty/4056: #0: ffff0000d664d098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001ce302f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2ec/0xf9c drivers/tty/n_tty.c:2198 2 locks held by syz-executor/4304: #0: ffff0000f67b60e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xe0/0x108 fs/super.c:362 #1: ffff0000ceb847d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000ceb847d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x170/0x824 fs/fs-writeback.c:2737 2 locks held by kworker/0:3/4343: 4 locks held by kworker/1:5/4348: 3 locks held by kworker/1:7/4402: #0: ffff0000d5dff538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff800020e67c20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 2 locks held by syz-executor/4744: #0: ffff0000feb680e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xe0/0x108 fs/super.c:362 #1: ffff0000cec847d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:362 [inline] #1: ffff0000cec847d0 (&bdi->wb_switch_rwsem){+.+.}-{3:3}, at: sync_inodes_sb+0x170/0x824 fs/fs-writeback.c:2737 4 locks held by kworker/u4:20/5390: #0: ffff0000c03dd138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff800021267c20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff8000176cb110 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x12c/0xa74 net/core/net_namespace.c:594 #3: ffff80001524c8c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x58/0x5d4 kernel/rcu/tree.c:4019 2 locks held by kworker/1:11/5536: #0: ffff0000c0020938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff800021567c20 ((work_completion)(&pwq->unbound_release_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 2 locks held by kworker/u4:21/5562: 2 locks held by kworker/u4:22/5708: #0: ffff0000c0029138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff8000234c7c20 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 1 lock held by syz-executor/5924: #0: ffff0000cd5b20e0 (&type->s_umount_key#68){++++}-{3:3}, at: deactivate_super+0xe0/0x108 fs/super.c:362 1 lock held by syz.0.452/5986: #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 1 lock held by syz-executor/6156: #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6ec/0xce4 net/core/rtnetlink.c:6150 3 locks held by kworker/0:12/6278: #0: ffff0000d5dff538 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x6b4/0x13a8 kernel/workqueue.c:2265 #1: ffff800023647c20 ( (work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6f8/0x13a8 kernel/workqueue.c:2267 #2: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:74 2 locks held by syz.3.508/6378: #0: ffff8000176cb110 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x298/0x588 net/core/net_namespace.c:504 #1: ffff80001524c8c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x58/0x5d4 kernel/rcu/tree.c:4019 1 lock held by syz-executor/6407: #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:74 [inline] #0: ffff8000176d7748 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6ec/0xce4 net/core/rtnetlink.c:6150 1 lock held by syz.6.562/6543: 1 lock held by syz.4.563/6549: #0: ffff00010bd8c0e0 (&type->s_umount_key#59/1){+.+.}-{3:3}, at: alloc_super+0x1a4/0x804 fs/super.c:228 =============================================