INFO: task syz-executor.3:11713 blocked for more than 140 seconds. Not tainted 4.19.128-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.3 D27200 11713 6673 0x00000004 Call Trace: context_switch kernel/sched/core.c:2826 [inline] __schedule+0x8a2/0x1fc0 kernel/sched/core.c:3515 schedule+0x8d/0x1b0 kernel/sched/core.c:3559 request_wait_answer+0x3d9/0x740 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1c0 fs/fuse/dev.c:505 fuse_simple_request+0x2db/0x6f0 fs/fuse/dev.c:576 create_new_entry.constprop.0+0x17a/0x5a0 fs/fuse/dir.c:564 fuse_mknod+0x225/0x2c0 fs/fuse/dir.c:622 vfs_create+0x388/0x5d0 fs/namei.c:2913 do_mknodat fs/namei.c:3768 [inline] do_mknodat+0x3cf/0x450 fs/namei.c:3745 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45ca59 Code: Bad RIP value. RSP: 002b:00007f1385a47c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000085 RAX: ffffffffffffffda RBX: 00000000004f65e0 RCX: 000000000045ca59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000750 R14: 00000000004ca3e2 R15: 00007f1385a486d4 Showing all locks held in the system: 1 lock held by khungtaskd/1079: #0: 000000008e552540 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4440 2 locks held by agetty/6361: #0: 000000002b0535bf (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 0000000085cc849c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1a50 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.3/11713: #0: 000000008fe0dc08 (sb_writers#22){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000008fe0dc08 (sb_writers#22){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #1: 000000009b8f3185 (&type->i_mutex_dir_key#8/1){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #1: 000000009b8f3185 (&type->i_mutex_dir_key#8/1){+.+.}, at: filename_create+0x15a/0x490 fs/namei.c:3638 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1079 Comm: khungtaskd Not tainted 4.19.128-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+0x1fc/0x2fe lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x962/0xe40 kernel/hung_task.c:287 kthread+0x30b/0x410 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3678 Comm: systemd-journal Not tainted 4.19.128-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_next_frame+0xc/0x1b10 arch/x86/kernel/unwind_orc.c:404 Code: b8 01 00 00 00 eb a4 e8 22 99 0e 00 4c 89 e7 e8 ba 32 6f 00 eb e5 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 41 57 <49> 89 ff 41 56 41 55 41 54 55 53 48 81 ec a0 00 00 00 48 c7 44 24 RSP: 0018:ffff888094b07ae8 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffff888094b07b90 RCX: 0000000000000004 RDX: ffff888094b07ba8 RSI: ffffffff81a683c8 RDI: ffff888094b07af8 RBP: ffff888094b07b80 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000027569 R11: 0000000000064061 R12: 0000000000000000 R13: 0000000000000000 R14: ffff888094af8640 R15: 0000000000000282 FS: 00007f484eecc8c0(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f484c53c000 CR3: 000000009491f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x83/0x100 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc.part.0+0x4f/0xd0 mm/kasan/kasan.c:553 kmem_cache_alloc+0x124/0x370 mm/slab.c:3559 getname_flags+0xce/0x590 fs/namei.c:140 user_path_at_empty+0x2a/0x50 fs/namei.c:2609 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x248/0x7a0 fs/open.c:397 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f484e1889c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffdeab08778 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffdeab0b690 RCX: 00007f484e1889c7 RDX: 00007f484ebf9a00 RSI: 0000000000000000 RDI: 000056302cc6a9a3 RBP: 00007ffdeab087b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffdeab0b690 R15: 00007ffdeab08ca0