INFO: task syz-executor.0:32378 blocked for more than 143 seconds. Not tainted 5.15.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:27792 pid:32378 ppid: 20170 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 __fdget_pos+0x24e/0x2f0 fs/file.c:990 fdget_pos include/linux/file.h:75 [inline] __do_sys_getdents64 fs/readdir.c:365 [inline] __se_sys_getdents64+0x1bb/0x4e0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fe056c7c8d9 RSP: 002b:00007fe0541d2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fe056d81020 RCX: 00007fe056c7c8d9 RDX: 0000000000000034 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007fe056cd6cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbbd10ecf R14: 00007fe0541d2300 R15: 0000000000022000 INFO: task syz-executor.5:32396 blocked for more than 144 seconds. Not tainted 5.15.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:27792 pid:32396 ppid: 676 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 __fdget_pos+0x24e/0x2f0 fs/file.c:990 fdget_pos include/linux/file.h:75 [inline] __do_sys_getdents64 fs/readdir.c:365 [inline] __se_sys_getdents64+0x1bb/0x4e0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f53285d08d9 RSP: 002b:00007f5325b26188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f53286d5020 RCX: 00007f53285d08d9 RDX: 0000000000000034 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f532862acb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff5597509f R14: 00007f5325b26300 R15: 0000000000022000 INFO: task syz-executor.4:32750 blocked for more than 145 seconds. Not tainted 5.15.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27792 pid:32750 ppid: 6437 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xc8d/0x1270 kernel/sched/core.c:6287 schedule+0x14b/0x210 kernel/sched/core.c:6366 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6425 __mutex_lock_common+0xdff/0x2550 kernel/locking/mutex.c:669 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:743 __fdget_pos+0x24e/0x2f0 fs/file.c:990 fdget_pos include/linux/file.h:75 [inline] __do_sys_getdents64 fs/readdir.c:365 [inline] __se_sys_getdents64+0x1bb/0x4e0 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f8f0301f8d9 RSP: 002b:00007f8f00575188 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007f8f03124020 RCX: 00007f8f0301f8d9 RDX: 0000000000000034 RSI: 0000000000000000 RDI: 0000000000000006 RBP: 00007f8f03079cb4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe8407a03f R14: 00007f8f00575300 R15: 0000000000022000 Showing all locks held in the system: 4 locks held by kworker/u4:0/8: 1 lock held by khungtaskd/26: #0: ffffffff8c91c1c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 1 lock held by in:imklog/6217: #0: ffff8880205af270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by agetty/6240: #0: ffff8880129c0098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc9000112c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6c5/0x1c60 drivers/tty/n_tty.c:2113 3 locks held by kworker/0:5/28858: #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:474 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock kernel/sched/sched.h:1317 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: rq_lock kernel/sched/sched.h:1620 [inline] #0: ffff8880b9c31558 (&rq->__lock){-.-.}-{2:2}, at: __schedule+0x188/0x1270 kernel/sched/core.c:6201 #1: ffff8880b9c1f888 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x4c1/0x780 kernel/sched/psi.c:880 #2: ffffffff8c91c1c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266 2 locks held by syz-executor.0/32374: 1 lock held by syz-executor.0/32378: #0: ffff888053d1cd70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by syz-executor.5/32390: 1 lock held by syz-executor.5/32396: #0: ffff88801fe454f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by syz-executor.4/32710: 1 lock held by syz-executor.4/32750: #0: ffff88805cf73770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by syz-executor.3/805: 1 lock held by syz-executor.3/817: #0: ffff88806c7f74f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by syz-executor.2/837: 1 lock held by syz-executor.2/866: #0: ffff88807bfe3770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 2 locks held by syz-executor.1/1023: 1 lock held by syz-executor.1/1028: #0: ffff8880592adc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:990 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 26 Comm: khungtaskd Not tainted 5.15.0-rc4-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+0x1dc/0x2d8 lib/dump_stack.c:106 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x16a/0x280 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+0xc54/0xca0 kernel/hung_task.c:295 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 14 Comm: rcu_preempt Not tainted 5.15.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:lookup_object lib/debugobjects.c:198 [inline] RIP: 0010:__debug_object_init+0x12b/0x1860 lib/debugobjects.c:571 Code: 45 31 f6 eb 10 66 2e 0f 1f 84 00 00 00 00 00 41 ff c6 48 8b 1b 48 85 db 74 3b 4c 8d 7b 18 4c 89 f8 48 c1 e8 03 42 80 3c 28 00 <74> 08 4c 89 ff e8 6b 44 b8 fd 4d 39 27 0f 84 9b 01 00 00 48 89 d8 RSP: 0018:ffffc90000d37a60 EFLAGS: 00000046 RAX: 1ffff1100953b6ce RBX: ffff88804a9db658 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: ffffc90000d37940 RBP: ffffc90000d37c30 R08: dffffc0000000000 R09: 0000000000000003 R10: fffff520001a6f29 R11: 0000000000000004 R12: ffffc90000d37c60 R13: dffffc0000000000 R14: 0000000000000005 R15: ffff88804a9db670 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000c0049bd0b0 CR3: 000000000c68e000 CR4: 00000000003506f0 DR0: 0000000000000005 DR1: 00000000000000ff DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: init_timer_on_stack_key kernel/time/timer.c:752 [inline] schedule_timeout+0x11d/0x300 kernel/time/timer.c:1879 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1957 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2130 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 ---------------- Code disassembly (best guess): 0: 45 31 f6 xor %r14d,%r14d 3: eb 10 jmp 0x15 5: 66 2e 0f 1f 84 00 00 nopw %cs:0x0(%rax,%rax,1) c: 00 00 00 f: 41 ff c6 inc %r14d 12: 48 8b 1b mov (%rbx),%rbx 15: 48 85 db test %rbx,%rbx 18: 74 3b je 0x55 1a: 4c 8d 7b 18 lea 0x18(%rbx),%r15 1e: 4c 89 f8 mov %r15,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) * 2a: 74 08 je 0x34 <-- trapping instruction 2c: 4c 89 ff mov %r15,%rdi 2f: e8 6b 44 b8 fd callq 0xfdb8449f 34: 4d 39 27 cmp %r12,(%r15) 37: 0f 84 9b 01 00 00 je 0x1d8 3d: 48 89 d8 mov %rbx,%rax