INFO: task syz.5.671:7602 blocked for more than 143 INFO: task syz.5.671:7602 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.5.671 state:D stack:0 pid:7602 tgid:7601 ppid:5148 task_flags:0x400140 flags:0x00000011 Call trace: __switch_to+0x2b0/0x6e0 arch/arm64/kernel/process.c:775 (T) context_switch kernel/sched/core.c:5510 [inline] __schedule+0x1370/0x2d80 kernel/sched/core.c:7234 __schedule_loop kernel/sched/core.c:7311 [inline] schedule+0x13c/0x20c kernel/sched/core.c:7326 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:7383 __mutex_lock_common kernel/locking/mutex.c:726 [inline] __mutex_lock+0x4ec/0xf14 kernel/locking/mutex.c:821 mutex_lock_nested+0x24/0x30 kernel/locking/mutex.c:874 sync_bdevs+0x214/0x3d4 block/bdev.c:1297 ksys_sync+0xc4/0x118 fs/sync.c:105 __arm64_sys_sync+0x14/0x24 fs/sync.c:111 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x64/0x260 arch/arm64/kernel/entry-common.c:736 el0t_64_sync_handler+0x48/0x148 arch/arm64/kernel/entry-common.c:755 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:594 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:840 [inline] #0: ffff800088cb6f20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x4c/0x188 kernel/locking/lockdep.c:6775 2 locks held by pr/ttyAMA-1/41: 2 locks held by kworker/u8:8/3402: 2 locks held by getty/4495: #0: ffff0000c9e0e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009248b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x348/0xf78 drivers/tty/n_tty.c:2211 1 lock held by udevd/5175: #0: ffff0000c7743350 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0xc4/0x880 block/bdev.c:948 1 lock held by syz.5.671/7602: #0: ffff0000c7743350 (&disk->open_mutex){+.+.}-{4:4}, at: sync_bdevs+0x214/0x3d4 block/bdev.c:1297 6 locks held by syz.7.1059/8979: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 #2: ffff0000c6b87a60 (&nbd->config_lock){+.+.}-{4:4}, at: nbd_genl_reconfigure+0x2e8/0x1430 drivers/block/nbd.c:2401 #3: ffff0000c77d0fd8 (&q->limits_lock){+.+.}-{4:4}, at: queue_limits_start_update include/linux/blkdev.h:1103 [inline] #3: ffff0000c77d0fd8 (&q->limits_lock){+.+.}-{4:4}, at: nbd_set_size+0x1e0/0x54c drivers/block/nbd.c:354 #4: ffff0000c77d09a8 (&q->q_usage_counter(io)#33){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x20/0x38 block/blk-mq.c:206 #5: ffff0000c77d09e0 (&q->q_usage_counter(queue)#17){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x20/0x38 block/blk-mq.c:206 2 locks held by syz.0.1062/8990: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz.1.1066/9004: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz.4.1071/9024: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz.6.1080/9060: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9063: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9080: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9097: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9283: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9400: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9491: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9508: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9525: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9542: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 2 locks held by syz-executor/9559: #0: ffff800089dfa488 (cb_lock){++++}-{4:4}, at: genl_rcv+0x28/0x50 net/netlink/genetlink.c:1217 #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_lock net/netlink/genetlink.c:35 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_op_lock net/netlink/genetlink.c:60 [inline] #1: ffff800089dfa2c0 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0xec/0x620 net/netlink/genetlink.c:1208 =============================================