INFO: task kworker/u4:3:92 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:3 state:D stack:0 pid:92 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:0) Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5257 [inline] __schedule+0xdb4/0x1aa4 kernel/sched/core.c:6584 schedule+0xc4/0x170 kernel/sched/core.c:6660 rwsem_down_write_slowpath+0xbd4/0x1324 kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 f2fs_write_inode+0x404/0x5a8 fs/f2fs/inode.c:748 write_inode fs/fs-writeback.c:1536 [inline] __writeback_single_inode+0x5e0/0x157c fs/fs-writeback.c:1753 writeback_sb_inodes+0x870/0x1470 fs/fs-writeback.c:1979 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2050 wb_writeback+0x420/0xfdc fs/fs-writeback.c:2155 wb_check_background_flush fs/fs-writeback.c:2221 [inline] wb_do_writeback fs/fs-writeback.c:2309 [inline] wb_workfn+0xb40/0xe18 fs/fs-writeback.c:2336 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 INFO: task kworker/u4:6:4555 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:0 pid:4555 ppid:2 flags:0x00000008 Workqueue: writeback wb_workfn (flush-7:1) Call trace: __switch_to+0x2f4/0x550 arch/arm64/kernel/process.c:555 context_switch kernel/sched/core.c:5257 [inline] __schedule+0xdb4/0x1aa4 kernel/sched/core.c:6584 schedule+0xc4/0x170 kernel/sched/core.c:6660 rwsem_down_write_slowpath+0xbd4/0x1324 kernel/locking/rwsem.c:1189 __down_write_common kernel/locking/rwsem.c:1314 [inline] __down_write kernel/locking/rwsem.c:1323 [inline] down_write+0x84/0x88 kernel/locking/rwsem.c:1574 f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 f2fs_write_inode+0x404/0x5a8 fs/f2fs/inode.c:748 write_inode fs/fs-writeback.c:1536 [inline] __writeback_single_inode+0x5e0/0x157c fs/fs-writeback.c:1753 writeback_sb_inodes+0x870/0x1470 fs/fs-writeback.c:1979 __writeback_inodes_wb+0x104/0x370 fs/fs-writeback.c:2050 wb_writeback+0x420/0xfdc fs/fs-writeback.c:2155 wb_check_background_flush fs/fs-writeback.c:2221 [inline] wb_do_writeback fs/fs-writeback.c:2309 [inline] wb_workfn+0xb40/0xe18 fs/fs-writeback.c:2336 process_one_work+0x7e4/0x13bc kernel/workqueue.c:2292 worker_thread+0x8cc/0xfe8 kernel/workqueue.c:2439 kthread+0x254/0x2e0 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:854 Showing all locks held in the system: 4 locks held by kworker/u4:0/9: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff80001dbb7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000da9680e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000eef45240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000eef45240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 4 locks held by kworker/u4:1/11: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff80001dbd7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000d1dea0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000d2091240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000d2091240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 1 lock held by rcu_tasks_kthre/12: #0: ffff8000165b7ed0 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc64 kernel/rcu/tasks.h:543 1 lock held by rcu_tasks_trace/13: #0: ffff8000165b8710 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x40/0xc64 kernel/rcu/tasks.h:543 1 lock held by khungtaskd/28: #0: ffff8000165b7580 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0xc/0x44 include/linux/rcupdate.h:349 4 locks held by kworker/u4:2/39: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff80001f047c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000f21f60e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000f0615240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000f0615240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 4 locks held by kworker/u4:3/92: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800021037c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000d324c0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000d300d240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000d300d240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 4 locks held by kworker/u4:4/1604: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff8000264a7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000db1d00e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000c3a19240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000c3a19240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 4 locks held by kworker/u4:5/1616: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800026527c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000ee6aa0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000f1a2d240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000f1a2d240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 2 locks held by getty/4087: #0: ffff0000d7264098 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80001fa732f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x2e8/0xffc drivers/tty/n_tty.c:2198 4 locks held by kworker/u4:6/4555: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800022047c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000cb1100e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000ef141240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000ef141240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 5 locks held by syz.0.17/4588: 4 locks held by syz.1.18/4619: 5 locks held by syz.2.19/4638: 7 locks held by syz.3.20/4657: 4 locks held by kworker/u4:7/4668: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800022307c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000de25a0e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000caa31240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000caa31240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 6 locks held by syz.4.21/4693: 5 locks held by syz.5.22/4721: 4 locks held by kworker/u4:10/4733: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800022a27c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000dd9920e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000ce0a9240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000ce0a9240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 3 locks held by kworker/u4:11/4738: 5 locks held by syz.6.23/4752: 4 locks held by kworker/u4:12/4787: #0: ffff0000c0c28938 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x69c/0x13bc kernel/workqueue.c:-1 #1: ffff800022bd7c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x6e8/0x13bc kernel/workqueue.c:2267 #2: ffff0000d2eb20e0 (&type->s_umount_key#51){.+.+}-{3:3}, at: trylock_super+0x24/0xf4 fs/super.c:415 #3: ffff0000df6c9240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2206 [inline] #3: ffff0000df6c9240 (&sbi->gc_lock){+.+.}-{3:3}, at: f2fs_balance_fs+0x3c0/0x5b0 fs/f2fs/segment.c:435 5 locks held by syz.7.24/4788: 7 locks held by syz.8.25/4817: 5 locks held by syz.9.26/4846: =============================================