NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.2:24973 blocked for more than 140 seconds. Not tainted 4.14.184-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27968 24973 6356 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x8a6/0x1d70 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 xlog_grant_head_wait+0x136/0xc10 fs/xfs/xfs_log.c:274 xlog_grant_head_check+0x34c/0x390 fs/xfs/xfs_log.c:336 xfs_log_reserve+0x2fb/0x9f0 fs/xfs/xfs_log.c:465 xfs_log_unmount_write+0x22e/0xa80 fs/xfs/xfs_log.c:869 xfs_log_unmount+0x1d/0xb0 fs/xfs/xfs_log.c:1009 xfs_log_mount_cancel+0x40/0x50 fs/xfs/xfs_log.c:812 xfs_mountfs+0x117d/0x1f20 fs/xfs/xfs_mount.c:1031 xfs_fs_fill_super+0xb7a/0x1380 fs/xfs/xfs_super.c:1688 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x25e0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x45f5fa RSP: 002b:00007feea4aa9a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 000000000050b640 RCX: 000000000045f5fa RDX: 00007feea4aa9ae0 RSI: 0000000020000000 RDI: 00007feea4aa9b00 RBP: 000000000078bf00 R08: 00007feea4aa9b40 R09: 00007feea4aa9ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000c65 R14: 00000000004cead7 R15: 00007feea4aaa6d4 Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by in:imklog/6000: #0: (&f->f_pos_lock){+.+.}, at: [] __fdget_pos+0xa6/0xc0 fs/file.c:769 1 lock held by syz-executor.2/24973: #0: (&type->s_umount_key#62/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#62/1){+.+.}, at: [] sget_userns+0x556/0xc30 fs/super.c:516 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 4.14.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x283 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x17f lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 2386 Comm: kworker/u4:4 Not tainted 4.14.184-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker task: ffff8880a154c200 task.stack: ffff8880a1558000 RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:360 [inline] RIP: 0010:rcu_is_watching+0x39/0xb0 kernel/rcu/tree.c:1130 RSP: 0018:ffff8880a155fcf8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000023980 RCX: 1ffffffff0f00bac RDX: dffffc0000000000 RSI: ffffffff86c449a0 RDI: ffffffff87805d60 RBP: ffff88805a04e300 R08: 0000000000000000 R09: 0000000000020012 R10: ffff8880a154cad8 R11: ffff8880a154c200 R12: ffff88805a04ecb0 R13: 00000000000000e0 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880aec00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f52372d2000 CR3: 0000000094c34000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rcu_read_unlock include/linux/rcupdate.h:681 [inline] batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:420 [inline] batadv_nc_worker+0x403/0x6d0 net/batman-adv/network-coding.c:726 process_one_work+0x7c0/0x14c0 kernel/workqueue.c:2116 worker_thread+0x5d7/0x1080 kernel/workqueue.c:2250 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 79 b2 01 48 c7 c3 80 39 02 00 48 ba 00 00 00 00 00 fc ff df 89 c0 48 8d 3c c5 60 5d 80 87 48 89 f9 48 c1 e9 03 80 3c 11 00 75 5b <48> 03 1c c5 60 5d 80 87 48 b8 00 00 00 00 00 fc ff df 48 8d 7b