IPVS: ftp: loaded support on port[0] = 21 INFO: task kworker/u4:2:55 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D25704 55 2 0x80000000 Workqueue: writeback wb_workfn (flush-7:1) Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 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 NILFS (loop3): invalid segment: Checksum error in segment payload 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 NILFS (loop3): trying rollback from an earlier position 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 NILFS (loop3): recovery complete kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 NILFS (loop3): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds Showing all locks held in the system: 4 locks held by kworker/u4:2/55: #0: 000000007c7d9fc2 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000432e9c56 ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000f2c1d6e7 (&type->s_umount_key#56){++++}, at: trylock_super+0x1d/0x100 fs/super.c:412 #3: 0000000090fe0d76 (&sbi->gc_mutex){+.+.}, at: f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 1 lock held by khungtaskd/1570: #0: 000000009f96b1ec (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7799: #0: 000000000f930f69 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor.5/8110: #0: 000000000aa69d2f (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: 000000000aa69d2f (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 2 locks held by kworker/0:3/9313: #0: 00000000491d4543 ((wq_completion)"rcu_gp"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 000000005bd61537 ((work_completion)(&rew.rew_work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 2 locks held by syz-executor.1/10417: 3 locks held by kworker/u4:11/10982: 1 lock held by syz-executor.0/16576: #0: 000000000aa69d2f (rcu_preempt_state.exp_mutex){+.+.}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: 000000000aa69d2f (rcu_preempt_state.exp_mutex){+.+.}, at: _synchronize_rcu_expedited+0x256/0x6f0 kernel/rcu/tree_exp.h:667 3 locks held by syz-executor.1/16565: #0: 0000000048200b83 (&mousedev->mutex/1){+.+.}, at: mixdev_close_devices+0x21/0x1f0 drivers/input/mousedev.c:489 #1: 00000000f06ca63e (&mousedev->mutex#2){+.+.}, at: mousedev_close_device drivers/input/mousedev.c:444 [inline] #1: 00000000f06ca63e (&mousedev->mutex#2){+.+.}, at: mixdev_close_devices+0x111/0x1f0 drivers/input/mousedev.c:497 #2: 00000000bd47e7ee (&dev->mutex#2){+.+.}, at: input_close_device+0x42/0x150 drivers/input/input.c:658 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4692 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 RIP: 0010:___bpf_prog_run+0x3283/0x4e80 kernel/bpf/core.c:1233 Code: e2 07 0f b6 04 18 38 d0 7f 08 84 c0 0f 85 ff 12 00 00 41 0f b6 46 01 83 e0 0f 4c 8d 7c c5 00 4c 89 f8 48 c1 e8 03 80 3c 18 00 <0f> 85 fe 09 00 00 49 8d 7e 04 49 8b 17 48 89 f8 48 c1 e8 03 0f b6 RSP: 0018:ffff8880a1397a30 EFLAGS: 00000246 RAX: 1ffff11014272f60 RBX: dffffc0000000000 RCX: ffffffff816c6963 RDX: 0000000000000001 RSI: ffffffff816c68ea RDI: ffffc90001ad4111 RBP: ffff8880a1397b00 R08: 0000000000000000 R09: 0000000000000027 R10: 0000000000000006 R11: 0000000000000000 R12: ffffffff886fb460 R13: ffffed1014272f62 R14: ffffc90001ad4110 R15: ffff8880a1397b00 FS: 00007fe0679c18c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f683155b1b8 CR3: 00000000a1450000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: