INFO: task syz-executor:6498 blocked for more than 143 seconds. Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:0 pid:6498 tgid:6498 ppid:1 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x414/0x834 arch/arm64/kernel/process.c:735 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x13b0/0x28d4 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xb4/0x230 kernel/sched/core.c:6860 wb_wait_for_completion+0x150/0x280 fs/fs-writeback.c:216 sync_inodes_sb+0x184/0x870 fs/fs-writeback.c:2833 sync_filesystem+0x160/0x218 fs/sync.c:64 generic_shutdown_super+0x70/0x2b8 fs/super.c:621 kill_block_super+0x44/0x90 fs/super.c:1710 ext4_kill_sb+0x68/0xa4 fs/ext4/super.c:7393 deactivate_locked_super+0xc4/0x12c fs/super.c:473 deactivate_super+0xe0/0x100 fs/super.c:506 cleanup_mnt+0x31c/0x3ac fs/namespace.c:1431 __cleanup_mnt+0x20/0x30 fs/namespace.c:1438 task_work_run+0x1dc/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] do_notify_resume+0x16c/0x1ec arch/arm64/kernel/entry-common.c:151 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xb4/0x17c arch/arm64/kernel/entry-common.c:768 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 3 locks held by kworker/u8:0/12: #0: ffff0000c0031148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff800097657bc0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 3 locks held by kworker/u8:1/14: #0: ffff0000d32db148 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff800097677bc0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 1 lock held by khungtaskd/32: #0: ffff80008f508920 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 2 locks held by pr/ttyAMA0/46: 3 locks held by kworker/u8:8/635: #0: ffff0000c0031948 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x658/0x156c kernel/workqueue.c:3212 #1: ffff80009ca47bc0 ((reg_check_chans).work){+.+.}-{0:0}, at: process_one_work+0x6ec/0x156c kernel/workqueue.c:3212 #2: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 4 locks held by kworker/u8:9/654: 2 locks held by dhcpcd/6161: #0: ffff800092473368 (vlan_ioctl_mutex){+.+.}-{4:4}, at: sock_ioctl+0x5b4/0x84c net/socket.c:1273 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 2 locks held by getty/6254: #0: ffff0000d79fa0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009b60b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x34c/0xfa0 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/6498: #0: ffff0000d4c5a0e0 (&type->s_umount_key#31){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff0000d4c5a0e0 (&type->s_umount_key#31){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff0000d4c5a0e0 (&type->s_umount_key#31){++++}-{4:4}, at: deactivate_super+0xd8/0x100 fs/super.c:505 #1: ffff0000ca5b47d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:387 [inline] #1: ffff0000ca5b47d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x16c/0x870 fs/fs-writeback.c:2831 4 locks held by kworker/u8:12/6859: 4 locks held by syz-executor/7836: #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x244/0x97c fs/read_write.c:680 #1: ffff0000d2330088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x488 fs/kernfs/file.c:325 #2: ffff0000cd565698 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1d0/0x488 fs/kernfs/file.c:326 #3: ffff800091543d68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:216 7 locks held by syz-executor/7843: #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x244/0x97c fs/read_write.c:680 #1: ffff0000c5e2ac88 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x488 fs/kernfs/file.c:325 #2: ffff0000cd5655a8 (kn->active#50){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1d0/0x488 fs/kernfs/file.c:326 #3: ffff800091543d68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: new_device_store+0x128/0x594 drivers/net/netdevsim/bus.c:166 #4: ffff0000f22d40e8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:922 [inline] #4: ffff0000f22d40e8 (&dev->mutex){....}-{4:4}, at: __device_attach+0x8c/0x388 drivers/base/dd.c:1004 #5: ffff0000cceef250 (&devlink->lock_key#12){+.+.}-{4:4}, at: devl_lock+0x24/0x34 net/devlink/core.c:276 #6: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 4 locks held by syz-executor/7850: #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3041 [inline] #0: ffff0000d87ee420 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x244/0x97c fs/read_write.c:680 #1: ffff0000c61be088 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1b4/0x488 fs/kernfs/file.c:325 #2: ffff0000cd565698 (kn->active#49){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x1d0/0x488 fs/kernfs/file.c:326 #3: ffff800091543d68 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd4/0x31c drivers/net/netdevsim/bus.c:216 2 locks held by syz-executor/7944: #0: ffff800092481e50 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x288/0x4a4 net/core/net_namespace.c:514 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock_killable+0x20/0x2c net/core/rtnetlink.c:91 2 locks held by syz-executor/7949: #0: ffff800092481e50 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x288/0x4a4 net/core/net_namespace.c:514 #1: ffff80009248e928 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock+0x20/0x2c net/core/rtnetlink.c:80 =============================================