tmpfs: No value for mount option ' sájÜ5’Ð)%ßúè^œÒ9Œlgȵ±&ñE´„¾E‘)fè·âö`iÅm×lÁ<:kMé™ÍÍÈ…Zî47ÜÈu€Ï¾To»ûÀëVØ»¾¢J|sÂ' netlink: 8 bytes leftover after parsing attributes in process `syz-executor0'. tmpfs: No value for mount option ' sájÜ5’Ð)%ßúè^œÒ9Œlgȵ±&ñE´„¾E‘)fè·âö`iÅm×lÁ<:kMé™ÍÍÈ…Zî47ÜÈu€Ï¾To»ûÀëVØ»¾¢J|sÂ' INFO: task syz-executor4:23769 blocked for more than 140 seconds. Not tainted 4.18.0-rc8+ #180 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D24216 23769 16901 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x95d/0x1630 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:715 [inline] chown_common+0x3a9/0x730 fs/open.c:640 do_fchownat+0x16e/0x250 fs/open.c:673 __do_sys_chown fs/open.c:693 [inline] __se_sys_chown fs/open.c:691 [inline] __x64_sys_chown+0x7b/0xc0 fs/open.c:691 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456cb9 Code: 18 85 c0 75 12 48 8b 44 24 20 48 89 08 48 8b 6c 24 28 48 83 c4 30 c3 48 8b 44 24 20 48 89 04 24 48 89 4c 24 08 e8 e7 ac fb ff e1 e8 f0 31 00 00 e9 7b ff ff ff cc cc cc cc cc cc cc cc cc cc RSP: 002b:00007f5473ce6c78 EFLAGS: 00000246 ORIG_RAX: 000000000000005c RAX: ffffffffffffffda RBX: 00007f5473ce76d4 RCX: 0000000000456cb9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000140 RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cacc0 R14: 00000000004c72d2 R15: 0000000000000003 Showing all locks held in the system: 1 lock held by khungtaskd/773: #0: 000000003696689c (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 2 locks held by rs:main Q:Reg/4262: #0: 000000007c315b9f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 00000000f002b19c (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2738 [inline] #1: 00000000f002b19c (sb_writers#6){.+.+}, at: vfs_write+0x452/0x560 fs/read_write.c:548 1 lock held by rsyslogd/4264: #0: 0000000018842159 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4354: #0: 00000000b55fad6a (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ad65799d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4355: #0: 0000000059584a31 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000edc2f8a1 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4356: #0: 000000003bb919f5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000080d0b7fe (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4357: #0: 000000002a6519a8 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000004e2b929a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4358: #0: 00000000395c30ad (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000051be9234 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4359: #0: 0000000055d6745b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000cac59454 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4360: #0: 00000000927dddd5 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000003841550c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-executor4/23704: #0: 0000000032142f18 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 0000000032142f18 (sb_writers#14){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000ac5e164d (&sb->s_type->i_mutex_key#17){++++}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000ac5e164d (&sb->s_type->i_mutex_key#17){++++}, at: chown_common+0x3a9/0x730 fs/open.c:640 2 locks held by syz-executor4/23769: #0: 0000000032142f18 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 0000000032142f18 (sb_writers#14){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000ac5e164d (&sb->s_type->i_mutex_key#17){++++}, at: inode_lock include/linux/fs.h:715 [inline] #1: 00000000ac5e164d (&sb->s_type->i_mutex_key#17){++++}, at: chown_common+0x3a9/0x730 fs/open.c:640 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 773 Comm: khungtaskd Not tainted 4.18.0-rc8+ #180 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54