INFO: task syz-executor.5:10615 blocked for more than 144 seconds. Not tainted 5.16.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28712 pid:10615 ppid: 6749 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 ptmx_open drivers/tty/pty.c:833 [inline] ptmx_open+0x103/0x360 drivers/tty/pty.c:800 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f8e61b96ae9 RSP: 002b:00007f8e5f0ca188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f8e61caa0e0 RCX: 00007f8e61b96ae9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 00007f8e61bf0f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca64c2d9f R14: 00007f8e5f0ca300 R15: 0000000000022000 INFO: task syz-executor.4:10632 blocked for more than 144 seconds. Not tainted 5.16.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:28296 pid:10632 ppid: 6591 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6385 __mutex_lock_common kernel/locking/mutex.c:680 [inline] __mutex_lock+0xa32/0x12f0 kernel/locking/mutex.c:740 ptmx_open drivers/tty/pty.c:833 [inline] ptmx_open+0x103/0x360 drivers/tty/pty.c:800 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4c8/0x1250 fs/open.c:822 do_open fs/namei.c:3426 [inline] path_openat+0x1cad/0x2750 fs/namei.c:3559 do_filp_open+0x1aa/0x400 fs/namei.c:3586 do_sys_openat2+0x16d/0x4d0 fs/open.c:1212 do_sys_open fs/open.c:1228 [inline] __do_sys_openat fs/open.c:1244 [inline] __se_sys_openat fs/open.c:1239 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1239 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7ffa171d8ae9 RSP: 002b:00007ffa1474e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007ffa172ebf60 RCX: 00007ffa171d8ae9 RDX: 0000000000000000 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 00007ffa17232f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff3906270f R14: 00007ffa1474e300 R15: 0000000000022000 Showing all locks held in the system: 3 locks held by ksoftirqd/1/19: 1 lock held by khungtaskd/27: #0: ffffffff8bb81120 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6440: #0: ffff88801dd65430 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 3 locks held by syz-executor.5/10611: 1 lock held by syz-executor.5/10615: #0: ffffffff8c5a5d88 (tty_mutex){+.+.}-{3:3}, at: ptmx_open drivers/tty/pty.c:833 [inline] #0: ffffffff8c5a5d88 (tty_mutex){+.+.}-{3:3}, at: ptmx_open+0x103/0x360 drivers/tty/pty.c:800 1 lock held by syz-executor.4/10632: #0: ffffffff8c5a5d88 (tty_mutex){+.+.}-{3:3}, at: ptmx_open drivers/tty/pty.c:833 [inline] #0: ffffffff8c5a5d88 (tty_mutex){+.+.}-{3:3}, at: ptmx_open+0x103/0x360 drivers/tty/pty.c:800 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:perf_trace_lock+0x19/0x4d0 include/trace/events/lock.h:39 Code: 08 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 ba 00 00 00 00 00 fc ff df 55 48 89 e5 41 57 48 8d 85 58 ff ff ff 41 56 <49> 89 f6 41 55 4c 8d 7d d8 48 c1 e8 03 49 89 fd 41 54 53 48 81 ec RSP: 0018:ffffc90000fafb38 EFLAGS: 00000246 RAX: ffffc90000fafaa0 RBX: ffff88807f777290 RCX: ffffffff815be5b7 RDX: dffffc0000000000 RSI: ffffc90000fafc58 RDI: ffffffff8ba7e420 RBP: ffffc90000fafb48 R08: 0000000000000000 R09: ffffffff8d90e4d7 R10: fffffbfff1b21c9a R11: 0000000000000000 R12: ffffc90000fafc58 R13: 1ffff920001f5f85 R14: ffffffff8747a450 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f10df46f000 CR3: 000000000b88e000 CR4: 00000000003526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4a8/0x720 kernel/locking/lockdep.c:5648 call_timer_fn+0x227/0x6b0 kernel/time/timer.c:1424 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 run_ksoftirqd kernel/softirq.c:920 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 08 c3 or %al,%bl 2: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 9: 00 00 00 00 d: 0f 1f 40 00 nopl 0x0(%rax) 11: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 18: fc ff df 1b: 55 push %rbp 1c: 48 89 e5 mov %rsp,%rbp 1f: 41 57 push %r15 21: 48 8d 85 58 ff ff ff lea -0xa8(%rbp),%rax 28: 41 56 push %r14 * 2a: 49 89 f6 mov %rsi,%r14 <-- trapping instruction 2d: 41 55 push %r13 2f: 4c 8d 7d d8 lea -0x28(%rbp),%r15 33: 48 c1 e8 03 shr $0x3,%rax 37: 49 89 fd mov %rdi,%r13 3a: 41 54 push %r12 3c: 53 push %rbx 3d: 48 rex.W 3e: 81 .byte 0x81 3f: ec in (%dx),%al