INFO: task syz-executor.4:8652 can't die for more than 143 seconds. task:syz-executor.4 state:D stack:29800 pid: 8652 ppid: 6868 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:00007fc5b10dbbf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020ffb000 RSI: 0000000020000040 RDI: 0000000000004e24 RBP: 000000000118cf98 R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000020ffb000 R13: 0000000020ffc000 R14: 0000000020000100 R15: 00000000200000c0 INFO: task syz-executor.4:8652 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.4 state:D stack:29800 pid: 8652 ppid: 6868 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:00007fc5b10dbbf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020ffb000 RSI: 0000000020000040 RDI: 0000000000004e24 RBP: 000000000118cf98 R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000020ffb000 R13: 0000000020ffc000 R14: 0000000020000100 R15: 00000000200000c0 INFO: task syz-executor.4:8714 can't die for more than 143 seconds. task:syz-executor.4 state:D stack:29096 pid: 8714 ppid: 6868 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:00007fc5b1099bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020ffb000 RSI: 0000000020000040 RDI: 0000000000004e24 RBP: 000000000118d0d8 R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000020ffb000 R13: 0000000020ffc000 R14: 0000000020000100 R15: 00000000200000c0 INFO: task syz-executor.4:8714 blocked for more than 144 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.4 state:D stack:29096 pid: 8714 ppid: 6868 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:00007fc5b1099bf8 EFLAGS: 00000206 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 0000000020000040 RCX: 000000000045d5b9 RDX: 0000000020ffb000 RSI: 0000000020000040 RDI: 0000000000004e24 RBP: 000000000118d0d8 R08: 0000000020000100 R09: 0000000020000100 R10: 00000000200000c0 R11: 0000000000000206 R12: 0000000020ffb000 R13: 0000000020ffc000 R14: 0000000020000100 R15: 00000000200000c0 INFO: task io_uring-sq:8657 blocked for more than 144 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: 8657 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 INFO: task io_uring-sq:8718 blocked for more than 144 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: 8718 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: 1 lock held by khungtaskd/1174: #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/6562: #0: ffff88809a2808b0 (&f->f_pos_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:354 [inline] #0: ffff88809a2808b0 (&f->f_pos_lock){+.+.}-{3:3}, at: double_lock_hb kernel/futex.c:1559 [inline] #0: ffff88809a2808b0 (&f->f_pos_lock){+.+.}-{3:3}, at: double_lock_hb kernel/futex.c:1556 [inline] #0: ffff88809a2808b0 (&f->f_pos_lock){+.+.}-{3:3}, at: futex_wake_op kernel/futex.c:1697 [inline] #0: ffff88809a2808b0 (&f->f_pos_lock){+.+.}-{3:3}, at: do_futex+0xd3d/0x1a50 kernel/futex.c:3760 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1174 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 3893 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:__lock_acquire+0xd4a/0x5570 kernel/locking/lockdep.c:4300 Code: fe 01 0f 87 c3 f3 ff ff 48 b8 00 00 00 00 00 fc ff df 89 f5 48 8d 7c eb 08 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 7d 2d 00 00 <48> 8b 44 eb 08 48 85 c0 0f 85 ae f3 ff ff e9 8e f3 ff ff 48 8b 6c RSP: 0018:ffffc90001197900 EFLAGS: 00000046 RAX: dffffc0000000000 RBX: ffffffff89c67500 RCX: 1ffff92000232f32 RDX: 1ffffffff138cea1 RSI: 0000000000000000 RDI: ffffffff89c67508 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: fffffbfff15796c1 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888094b441c0 R15: 0000000000000002 FS: 00007f996176b8c0(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f995eab4000 CR3: 00000000949a3000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1f3/0xae0 kernel/locking/lockdep.c:5006 rcu_lock_acquire include/linux/rcupdate.h:248 [inline] rcu_read_lock include/linux/rcupdate.h:641 [inline] path_init+0x851/0x13c0 fs/namei.c:2212 path_parentat+0x22/0x1b0 fs/namei.c:2384 filename_parentat+0x188/0x560 fs/namei.c:2407 filename_create+0x9e/0x490 fs/namei.c:3449 user_path_create fs/namei.c:3524 [inline] do_mkdirat+0xa0/0x2d0 fs/namei.c:3664 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9960a27687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fffe29d5168 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fffe29d8080 RCX: 00007f9960a27687 RDX: 00007f9961498a00 RSI: 00000000000001ed RDI: 00005603de2018a0 RBP: 00007fffe29d51a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fffe29d8080 R15: 00007fffe29d5690