netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 76 bytes leftover after parsing attributes in process `syz-executor.1'. INFO: task kworker/u4:9:14024 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.5'. "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. netlink: 76 bytes leftover after parsing attributes in process `syz-executor.5'. kworker/u4:9 D24944 14024 2 0x80000000 Workqueue: writeback wb_workfn (flush-7:0) netlink: 28 bytes leftover after parsing attributes in process `syz-executor.3'. Call Trace: netlink: 76 bytes leftover after parsing attributes in process `syz-executor.3'. context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 netlink: 28 bytes leftover after parsing attributes in process `syz-executor.4'. netlink: 28 bytes leftover after parsing attributes in process `syz-executor.1'. schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3619 __mutex_lock_common kernel/locking/mutex.c:1016 [inline] __mutex_lock+0x5f0/0x1190 kernel/locking/mutex.c:1078 f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 f2fs_write_inode+0x500/0x600 fs/f2fs/inode.c:630 write_inode fs/fs-writeback.c:1244 [inline] __writeback_single_inode+0x733/0x11d0 fs/fs-writeback.c:1442 writeback_sb_inodes+0x537/0xef0 fs/fs-writeback.c:1647 __writeback_inodes_wb+0xc6/0x280 fs/fs-writeback.c:1716 wb_writeback+0x841/0xcc0 fs/fs-writeback.c:1822 wb_check_old_data_flush fs/fs-writeback.c:1924 [inline] wb_do_writeback fs/fs-writeback.c:1977 [inline] wb_workfn+0x8ba/0x1250 fs/fs-writeback.c:2006 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000007e4b7992 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7796: 2 locks held by agetty/7823: #0: 00000000b831c47d (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000dbe65e06 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 4 locks held by kworker/u4:9/14024: #0: 0000000024facc54 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000022b11e0 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000000bb38e57 (&type->s_umount_key#49){++++}, at: trylock_super+0x1d/0x100 fs/super.c:412 #3: 0000000059545db7 (&sbi->gc_mutex){+.+.}, at: f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 4 locks held by syz-executor.0/19352: 2 locks held by syz-executor.0/21895: #0: 000000000bb38e57 (&type->s_umount_key#49){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000fa005c5c (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000fa005c5c (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 1 lock held by syz-executor.0/24209: #0: 00000000b123d9cf (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #0: 00000000b123d9cf (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 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+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8170 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 RIP: 0010:copy_user_generic_unrolled+0x8c/0xc0 arch/x86/lib/copy_user_64.S:68 Code: 47 20 4c 89 4f 28 4c 89 57 30 4c 89 5f 38 48 8d 76 40 48 8d 7f 40 ff c9 75 b6 89 d1 83 e2 07 c1 e9 03 74 12 4c 8b 06 4c 89 07 <48> 8d 76 08 48 8d 7f 08 ff c9 75 ee 21 d2 74 10 89 d1 8a 06 88 07 RSP: 0018:ffff88808f7b7da8 EFLAGS: 00040202 RAX: ffffed1011ef6fc3 RBX: 0000000000000010 RCX: 0000000000000002 RDX: 0000000000000000 RSI: 00007fff531b7290 RDI: ffff88808f7b7e08 RBP: 00007fff531b7290 R08: 0000000000000000 R09: ffffed1011ef6fc2 R10: ffff88808f7b7e17 R11: 0000000000000000 R12: 00007fff531b72a0 R13: ffff88808f7b7e08 R14: 00007ffffffff000 R15: 0000000000000000 FS: 0000555555ada400(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000056288c519bc0 CR3: 00000000912f9000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: copy_user_generic arch/x86/include/asm/uaccess_64.h:37 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:71 [inline] _copy_from_user+0xfc/0x130 lib/usercopy.c:13 copy_from_user include/linux/uaccess.h:147 [inline] get_timespec64+0x75/0x120 kernel/time/time.c:862 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1221 [inline] __se_sys_clock_nanosleep+0x128/0x360 kernel/time/posix-timers.c:1209 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fb7b521de21 Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f RSP: 002b:00007fff531b7250 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 RAX: ffffffffffffffda RBX: 00000000000014ae RCX: 00007fb7b521de21 RDX: 00007fff531b7290 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fff531b731c R08: 0000000000000000 R09: 000000fb253e2275 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 R13: 00000000000ee955 R14: 0000000000000000 R15: 00007fff531b7380