F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 INFO: task syz-executor.5:29179 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. syz-executor.5 D29072 29179 8128 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f8ce9af0639 Code: Bad RIP value. RSP: 002b:00007f8ce8042168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f8ce9c11050 RCX: 00007f8ce9af0639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f8ce9b4bae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff8e25c83f R14: 00007f8ce8042300 R15: 0000000000022000 INFO: task syz-executor.0:29184 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. syz-executor.0 D29072 29184 8134 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f1f8b712639 Code: Bad RIP value. RSP: 002b:00007f1f89c64168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f1f8b833050 RCX: 00007f1f8b712639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f1f8b76dae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdbe4c2a3f R14: 00007f1f89c64300 R15: 0000000000022000 INFO: task syz-executor.2:29190 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. syz-executor.2 D29072 29190 22232 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f15a0738639 Code: Bad RIP value. RSP: 002b:00007f159ec8a168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f15a0859050 RCX: 00007f15a0738639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f15a0793ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc04c4ef2f R14: 00007f159ec8a300 R15: 0000000000022000 INFO: task syz-executor.3:29201 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. syz-executor.3 D29072 29201 8161 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f383a4ec639 Code: Bad RIP value. RSP: 002b:00007f3838a3e168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f383a60d050 RCX: 00007f383a4ec639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f383a547ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5631194f R14: 00007f3838a3e300 R15: 0000000000022000 INFO: task syz-executor.3:29202 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. syz-executor.3 D29072 29202 8161 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f383a4ec639 Code: Bad RIP value. RSP: 002b:00007f3838a1d168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f383a60d120 RCX: 00007f383a4ec639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f383a547ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5631194f R14: 00007f3838a1d300 R15: 0000000000022000 INFO: task syz-executor.3:29204 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. syz-executor.3 D29072 29204 8161 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 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_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 sync_fs_one_sb fs/sync.c:80 [inline] sync_fs_one_sb+0xbe/0xf0 fs/sync.c:77 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0xa8/0x150 fs/sync.c:115 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f383a4ec639 Code: Bad RIP value. RSP: 002b:00007f38389fc168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f383a60d1f0 RCX: 00007f383a4ec639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f383a547ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5631194f R14: 00007f38389fc300 R15: 0000000000022000 INFO: task syz-executor.3:29211 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. syz-executor.3 D30024 29211 8161 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 wb_wait_for_completion+0x175/0x1f0 fs/fs-writeback.c:222 sync_inodes_sb+0x19d/0x9a0 fs/fs-writeback.c:2459 sync_inodes_one_sb+0x4d/0x60 fs/sync.c:74 iterate_supers+0x13c/0x290 fs/super.c:633 ksys_sync+0x86/0x150 fs/sync.c:113 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f383a4ec639 Code: Bad RIP value. RSP: 002b:00007f38389ba168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f383a60d390 RCX: 00007f383a4ec639 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f383a547ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5631194f R14: 00007f38389ba300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1571: #0: 00000000c405ea10 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7806: #0: 000000000e0ece02 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 3 locks held by kworker/u4:8/9508: #0: 000000003aa51f94 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline] #0: 000000003aa51f94 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841 #1: 00000000df3199fc ((work_completion)(&(&bat_priv->nc.work)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 000000003aa51f94 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1826 [inline] #2: 000000003aa51f94 (&rq->lock){-.-.}, at: __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 5 locks held by kworker/u4:10/9900: #0: 0000000091162327 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 00000000501aa23c ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 #2: 00000000da776982 (&type->s_umount_key#71){++++}, at: trylock_super+0x1d/0x100 fs/super.c:412 #3: 00000000659328b8 (&sbi->writepages){+.+.}, at: __f2fs_write_data_pages fs/f2fs/data.c:2212 [inline] #3: 00000000659328b8 (&sbi->writepages){+.+.}, at: f2fs_write_data_pages+0x478/0x1060 fs/f2fs/data.c:2244 #4: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_balance_fs+0x709/0xd80 fs/f2fs/segment.c:512 2 locks held by agetty/18277: #0: 000000000c19d72f (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 000000006afd593c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.5/29179: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.0/29184: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.2/29190: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.3/29201: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.3/29202: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.3/29204: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 00000000c813a83d (&sbi->gc_mutex){+.+.}, at: f2fs_sync_fs+0x278/0x530 fs/f2fs/super.c:1108 2 locks held by syz-executor.3/29211: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.0/30243: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.0/30257: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.0/30264: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 f2fs_msg: 4451 callbacks suppressed F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 2 locks held by syz-executor.0/30281: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 2 locks held by syz-executor.2/30295: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 2 locks held by syz-executor.2/30303: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.2/30304: F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 2 locks held by syz-executor.2/30307: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 F2FS-fs (loop2): sanity_check_inode: inode (ino=8) has corrupted i_extra_isize: 36, max: 24 2 locks held by syz-executor.5/30317: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.5/30318: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.5/30319: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.5/30323: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.2/31059: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.2/31060: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.2/31061: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 2 locks held by syz-executor.2/31063: #0: 00000000da776982 (&type->s_umount_key#71){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 0000000028cf2139 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 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 skipped: idling at native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:60