netlink: 2 bytes leftover after parsing attributes in process `syz-executor5'. syz-executor3 (21658): /proc/21655/oom_adj is deprecated, please use /proc/21655/oom_score_adj instead. INFO: task syz-executor0:21631 blocked for more than 120 seconds. Not tainted 4.16.0+ #16 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D21608 21631 4519 0x00000004 Call Trace: context_switch kernel/sched/core.c:2848 [inline] __schedule+0x807/0x1e40 kernel/sched/core.c:3490 schedule+0xef/0x430 kernel/sched/core.c:3549 io_schedule+0x1c/0x70 kernel/sched/core.c:5169 bit_wait_io+0x18/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit+0xb3/0x130 kernel/sched/wait_bit.c:48 out_of_line_wait_on_bit+0x204/0x3a0 kernel/sched/wait_bit.c:63 wait_on_bit_io include/linux/wait_bit.h:101 [inline] __wait_on_buffer fs/buffer.c:118 [inline] wait_on_buffer include/linux/buffer_head.h:356 [inline] __bread_slow fs/buffer.c:1192 [inline] __bread_gfp+0x2bd/0x310 fs/buffer.c:1373 sb_bread include/linux/buffer_head.h:309 [inline] fat12_ent_bread+0x14e/0x3d0 fs/fat/fatent.c:75 fat_ent_read_block fs/fat/fatent.c:441 [inline] fat_alloc_clusters+0x8bf/0x16b0 fs/fat/fatent.c:489 fat_add_cluster+0x72/0x140 fs/fat/inode.c:101 __fat_get_block fs/fat/inode.c:148 [inline] fat_get_block+0x373/0xaf0 fs/fat/inode.c:177 __block_write_begin_int+0x505/0x1ad0 fs/buffer.c:1981 __block_write_begin fs/buffer.c:2031 [inline] block_write_begin+0xd2/0x350 fs/buffer.c:2090 cont_write_begin+0x531/0x820 fs/buffer.c:2440 fat_write_begin+0x8d/0x120 fs/fat/inode.c:223 generic_perform_write+0x39a/0x6a0 mm/filemap.c:3138 __generic_file_write_iter+0x3be/0x5e0 mm/filemap.c:3263 generic_file_write_iter+0x430/0x850 mm/filemap.c:3291 call_write_iter include/linux/fs.h:1784 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x5bc/0x880 fs/read_write.c:487 vfs_write+0x1f8/0x560 fs/read_write.c:549 ksys_write+0xf9/0x250 fs/read_write.c:598 SYSC_write fs/read_write.c:610 [inline] SyS_write+0x24/0x30 fs/read_write.c:607 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x455259 RSP: 002b:00007f49a7784c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f49a77856d4 RCX: 0000000000455259 RDX: 0000000000000110 RSI: 0000000020000040 RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000006bd R14: 00000000006fd258 R15: 0000000000000000 Showing all locks held in the system: 3 locks held by kworker/u4:0/6: #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:57 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000b4ac3211 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xaef/0x1b50 kernel/workqueue.c:2116 #1: 0000000004137fd5 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb46/0x1b50 kernel/workqueue.c:2120 #2: 00000000531e87cb (&type->s_umount_key#69){++++}, at: trylock_super+0x22/0x110 fs/super.c:395 2 locks held by khungtaskd/888: #0: 000000000f5a608d (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: 000000000f5a608d (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249 #1: 0000000033a85867 (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470 1 lock held by rsyslogd/4355: #0: 000000005c1e1d63 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 2 locks held by getty/4445: #0: 00000000f2800a33 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000ad9b919b (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4446: #0: 00000000fca83156 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000163e4a5e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4447: #0: 00000000dd8d83f6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000040d762b8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4448: #0: 000000006c45f455 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000009a51f7a8 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4449: #0: 00000000187ffc7c (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000002b409ced (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4450: #0: 000000007c4783b0 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000db9cfcba (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 2 locks held by getty/4451: #0: 00000000dbb4a656 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000d45af333 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131 4 locks held by syz-executor0/21631: #0: 00000000a674510c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 #1: 000000001d82e3d7 (sb_writers#20){.+.+}, at: file_start_write include/linux/fs.h:2712 [inline] #1: 000000001d82e3d7 (sb_writers#20){.+.+}, at: vfs_write+0x452/0x560 fs/read_write.c:548 #2: 00000000a0298fef (&sb->s_type->i_mutex_key#17){++++}, at: inode_lock include/linux/fs.h:713 [inline] #2: 00000000a0298fef (&sb->s_type->i_mutex_key#17){++++}, at: generic_file_write_iter+0xe5/0x850 mm/filemap.c:3288 #3: 00000000891d706f (&sbi->fat_lock){+.+.}, at: lock_fat fs/fat/fatent.c:278 [inline] #3: 00000000891d706f (&sbi->fat_lock){+.+.}, at: fat_alloc_clusters+0x1a4/0x16b0 fs/fat/fatent.c:473 2 locks held by syz-executor0/21663: #0: 000000001d82e3d7 (sb_writers#20){.+.+}, at: sb_start_write include/linux/fs.h:1550 [inline] #0: 000000001d82e3d7 (sb_writers#20){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000a0298fef (&sb->s_type->i_mutex_key#17){++++}, at: inode_lock include/linux/fs.h:713 [inline] #1: 00000000a0298fef (&sb->s_type->i_mutex_key#17){++++}, at: do_truncate+0x197/0x2a0 fs/open.c:61 1 lock held by syz-executor0/21664: #0: 00000000a674510c (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766 1 lock held by syz-executor6/21649: #0: 00000000531e87cb (&type->s_umount_key#69){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:596 1 lock held by syz-executor6/21666: #0: 00000000531e87cb (&type->s_umount_key#69){++++}, at: iterate_supers+0xe2/0x290 fs/super.c:596 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 888 Comm: khungtaskd Not tainted 4.16.0+ #16 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+0x1b9/0x294 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_task kernel/hung_task.c:132 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline] watchdog+0xc10/0xf60 kernel/hung_task.c:249 kthread+0x345/0x410 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:411 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.16.0+ #16 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:find_next_bit+0x1/0x130 lib/find_bit.c:73 RSP: 0018:ffff8801db007a50 EFLAGS: 00000006 RAX: 000000000000003a RBX: 000000010002f3ba RCX: ffffffff815c9f51 RDX: 000000000000003a RSI: 0000000000000040 RDI: ffff8801db0236d8 RBP: ffff8801db007aa0 R08: ffffed003b6046d1 R09: ffffed003b6046d0 R10: ffffed003b6046d0 R11: ffff8801db023683 R12: 0000000000000000 R13: 000000000000003a R14: 0000000000000040 R15: 000000010002f3be FS: 0000000000000000(0000) GS:ffff8801db000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000cb1000 CR3: 00000001b0c46000 CR4: 00000000001426f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: get_next_timer_interrupt+0x68/0x320 kernel/time/timer.c:1534 tick_nohz_stop_sched_tick kernel/time/tick-sched.c:693 [inline] __tick_nohz_idle_enter+0xd3d/0x1710 kernel/time/tick-sched.c:918 tick_nohz_irq_exit+0x66/0x80 kernel/time/tick-sched.c:971 tick_irq_exit kernel/softirq.c:387 [inline] irq_exit+0x1bb/0x200 kernel/softirq.c:407 scheduler_ipi+0x52b/0xa30 kernel/sched/core.c:1778 smp_reschedule_interrupt+0xed/0x660 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:886 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffffffff88a07c38 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffffffff1140f8a RCX: 0000000000000000 RDX: 1ffffffff1162f80 RSI: 0000000000000001 RDI: ffffffff88b17c00 RBP: ffffffff88a07c38 R08: ffffffff88a752c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff88a07cf0 R14: ffffffff88b17bf0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:94 [inline] default_idle+0xc2/0x440 arch/x86/kernel/process.c:354 arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:345 default_idle_call+0x6d/0x90 kernel/sched/idle.c:93 cpuidle_idle_call kernel/sched/idle.c:151 [inline] do_idle+0x2f4/0x3c0 kernel/sched/idle.c:241 cpu_startup_entry+0x104/0x120 kernel/sched/idle.c:346 rest_init+0xe1/0xe4 init/main.c:437 start_kernel+0x887/0x8ae init/main.c:717 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:443 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:424 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:242 Code: 7e 42 fe 48 8b 45 c8 48 83 c4 10 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 89 df e8 ac 29 7e fe eb b8 66 2e 0f 1f 84 00 00 00 00 00 55 <48> 89 e5 41 57 41 56 49 89 fe 41 55 49 89 f5 41 54 53 48 89 d3