INFO: task syz-executor.1:16701 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:25600 pid:16701 ppid: 6895 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4526 schedule+0xd0/0x2a0 kernel/sched/core.c:4601 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1855 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x163/0x260 kernel/sched/completion.c:138 io_sq_thread_stop fs/io_uring.c:6906 [inline] io_finish_async fs/io_uring.c:6920 [inline] io_sq_offload_create fs/io_uring.c:7595 [inline] io_uring_create fs/io_uring.c:8671 [inline] io_uring_setup+0x1495/0x29a0 fs/io_uring.c:8744 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: Bad RIP value. RSP: 002b:00007f970cde6bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 00000000200006c0 RCX: 000000000045d5b9 RDX: 0000000020ffc000 RSI: 00000000200006c0 RDI: 000000000000709f RBP: 000000000118cf98 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020000640 R11: 0000000000000206 R12: 0000000020ffc000 R13: 0000000020ffa000 R14: 0000000000000000 R15: 0000000020000640 INFO: task io_uring-sq:16748 blocked for more than 143 seconds. Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:io_uring-sq state:D stack:31120 pid:16748 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:3777 [inline] __schedule+0xea9/0x2230 kernel/sched/core.c:4526 schedule+0xd0/0x2a0 kernel/sched/core.c:4601 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4660 kthread+0x2ac/0x4a0 kernel/kthread.c:285 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 3 locks held by kworker/u4:5/240: #0: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: newidle_balance+0x77f/0xe30 kernel/sched/fair.c:10555 #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: cpu_of kernel/sched/sched.h:1072 [inline] #1: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: __update_idle_core+0x39/0x3e0 kernel/sched/fair.c:6014 #2: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1292 [inline] #2: ffff8880ae635fd8 (&rq->lock){-.-.}-{2:2}, at: __schedule+0x270/0x2230 kernel/sched/core.c:4444 1 lock held by khungtaskd/1175: #0: ffffffff89c67500 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5829 1 lock held by in:imklog/6564: #0: ffff888097a9a170 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 2 locks held by rs:main Q:Reg/6565: #0: ffff8880a1dbf630 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930 #1: ffff888214a6e460 (sb_writers#4){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2793 [inline] #1: ffff888214a6e460 (sb_writers#4){.+.+}-{0:0}, at: vfs_write+0x54f/0x730 fs/read_write.c:574 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1175 Comm: khungtaskd Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x198/0x1fd lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd89/0xf30 kernel/hung_task.c:339 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3900 Comm: systemd-journal Not tainted 5.9.0-rc3-next-20200903-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlock_class kernel/locking/lockdep.c:191 [inline] RIP: 0010:mark_lock+0xca/0x1710 kernel/locking/lockdep.c:3983 Code: 0f b7 db be 08 00 00 00 48 89 d8 48 c1 f8 06 48 8d 3c c5 a0 b9 6a 8c e8 f4 37 5b 00 48 0f a3 1d 1c c8 10 0b 0f 83 c1 00 00 00 <48> 69 db b8 00 00 00 48 81 c3 c0 bd 6a 8c 48 8d 7b 50 48 b8 00 00 RSP: 0018:ffffc90000ef7a28 EFLAGS: 00000047 RAX: 0000000000000001 RBX: 00000000000000a0 RCX: ffffffff8159f17c RDX: fffffbfff18d5737 RSI: 0000000000000008 RDI: ffffffff8c6ab9b0 RBP: ffff888093e5c340 R08: 0000000000000000 R09: ffffffff8c6ab9b7 R10: fffffbfff18d5736 R11: 0000000000000000 R12: 0000000000000008 R13: ffff888093e5cc72 R14: ffff888093e5cc50 R15: ffffffff8c6b30c0 FS: 00007f06357a98c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0632bd9000 CR3: 000000009391c000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: mark_usage kernel/locking/lockdep.c:3931 [inline] __lock_acquire+0x88e/0x5570 kernel/locking/lockdep.c:4380 lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006 __fs_reclaim_acquire mm/page_alloc.c:4220 [inline] fs_reclaim_acquire+0xc1/0xf0 mm/page_alloc.c:4231 slab_pre_alloc_hook.constprop.0+0x20/0x200 mm/slab.h:494 slab_alloc mm/slab.c:3298 [inline] kmem_cache_alloc+0x46/0x3a0 mm/slab.c:3482 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138 getname_flags include/linux/audit.h:320 [inline] getname+0x8e/0xd0 fs/namei.c:209 do_sys_openat2+0xf5/0x420 fs/open.c:1162 do_sys_open fs/open.c:1184 [inline] __do_sys_open fs/open.c:1192 [inline] __se_sys_open fs/open.c:1188 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1188 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f0634d39840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fffb0d8c6c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fffb0d8c9d0 RCX: 00007f0634d39840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055b92adf8060 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055b92adf4040 R14: 00007fffb0d8c990 R15: 000055b92ae006d0