INFO: task syz-executor.0:24037 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:29216 pid:24037 ppid: 8528 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x8eb/0x21b0 kernel/sched/core.c:5078 schedule+0xcf/0x270 kernel/sched/core.c:5157 rwsem_down_read_slowpath+0x4ca/0x980 kernel/locking/rwsem.c:992 __down_read_common kernel/locking/rwsem.c:1213 [inline] __down_read kernel/locking/rwsem.c:1222 [inline] down_read+0xdf/0x460 kernel/locking/rwsem.c:1355 inode_lock_shared include/linux/fs.h:783 [inline] lookup_slow fs/namei.c:1560 [inline] walk_component+0x409/0x6a0 fs/namei.c:1861 lookup_last fs/namei.c:2310 [inline] path_lookupat+0x1ba/0x830 fs/namei.c:2334 do_o_path fs/namei.c:3340 [inline] path_openat+0x183d/0x27a0 fs/namei.c:3362 do_filp_open+0x17e/0x3c0 fs/namei.c:3396 do_sys_openat2+0x16d/0x420 fs/open.c:1172 do_sys_open fs/open.c:1188 [inline] __do_sys_openat fs/open.c:1204 [inline] __se_sys_openat fs/open.c:1199 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1199 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e149 RSP: 002b:00007f09367abc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045e149 RDX: 0000000000280440 RSI: 0000000020004280 RDI: ffffffffffffff9c RBP: 000000000119c118 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c0dc R13: 00000000016afb7f R14: 00007f09367ac9c0 R15: 000000000119c0dc Showing all locks held in the system: 1 lock held by khungtaskd/1660: #0: ffffffff8b78e1e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x28c kernel/locking/lockdep.c:6254 1 lock held by khugepaged/1667: 1 lock held by in:imklog/8180: #0: ffff888016c02d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:947 2 locks held by agetty/8408: #0: ffff88801529a098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:266 #1: ffffc90000f7c2e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x21d/0x1ac0 drivers/tty/n_tty.c:2158 3 locks held by syz-executor.0/24035: 1 lock held by syz-executor.0/24037: #0: ffff88807143b750 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:783 [inline] #0: ffff88807143b750 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow fs/namei.c:1560 [inline] #0: ffff88807143b750 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: walk_component+0x409/0x6a0 fs/namei.c:1861 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1660 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x3c/0xef lib/nmi_backtrace.c:105 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:209 [inline] watchdog+0xe36/0x10b0 kernel/hung_task.c:294 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4900 Comm: systemd-journal Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:pid_nr_ns kernel/pid.c:477 [inline] RIP: 0010:__task_pid_nr_ns+0x1b3/0x500 kernel/pid.c:500 Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e8 02 00 00 45 8b 6c 24 04 89 ef 44 89 ee e8 4d 7e 28 00 <44> 39 ed 0f 86 cb 00 00 00 45 31 e4 e8 9c 78 28 00 e8 d7 5a ce 07 RSP: 0018:ffffc9000133ff18 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffffffff8b64cc40 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffff888012375040 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff8149a4d3 R11: 0000000000000000 R12: ffff88802616e640 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 00007f44882338c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f44857de740 CR3: 0000000011947000 CR4: 00000000001526e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: task_tgid_vnr include/linux/sched.h:1470 [inline] __do_sys_getpid+0x1a/0x20 kernel/sys.c:908 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f44874ccf17 Code: ff ff ff 48 8b 4d a0 0f b7 51 fe 48 8b 4d a8 66 89 54 08 fe e9 1a ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 b8 27 00 00 00 0f 05 0f 1f 84 00 00 00 00 00 b8 6e 00 00 00 0f 05 c3 0f 1f 84 00 00 RSP: 002b:00007ffcf794adc8 EFLAGS: 00000202 ORIG_RAX: 0000000000000027 RAX: ffffffffffffffda RBX: 000055f459ffe1e0 RCX: 00007f44874ccf17 RDX: 00007ffcf794ae80 RSI: 0000000000000000 RDI: 000055f459ffe1e0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000202 R12: 00007ffcf794ae80 R13: 0000000000001324 R14: 00007ffcf794dc70 R15: 00007ffcf794b280