audit: type=1800 audit(1673203507.453:310): pid=24187 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=13866 res=0 Bluetooth: hci9: command 0x041b tx timeout Bluetooth: hci9: command 0x040f tx timeout Bluetooth: hci9: command 0x0419 tx timeout INFO: task kworker/u4:0:8232 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/u4:0 D25696 8232 2 0x80000000 Workqueue: writeback wb_workfn (flush-7:2) 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 queue_log_writer+0x27a/0x2d0 fs/reiserfs/journal.c:2990 do_journal_begin_r+0x97b/0x10b0 fs/reiserfs/journal.c:3113 journal_begin+0x162/0x400 fs/reiserfs/journal.c:3265 reiserfs_write_inode+0x1f0/0x2d0 fs/reiserfs/inode.c:1787 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 wb_writeback+0x28d/0xcc0 fs/fs-writeback.c:1820 wb_do_writeback fs/fs-writeback.c:1965 [inline] wb_workfn+0x29b/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 INFO: task syz-executor.0:22029 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 D28304 22029 8160 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7f20a86740c9 Code: Bad RIP value. RSP: 002b:00007f20a6be6168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f20a8793f80 RCX: 00007f20a86740c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f20a86cfae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaf5838df R14: 00007f20a6be6300 R15: 0000000000022000 INFO: task syz-executor.0:22151 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 D28296 22151 8160 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7f20a86740c9 Code: Bad RIP value. RSP: 002b:00007f209f7c5168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f20a8794050 RCX: 00007f20a86740c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f20a86cfae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaf5838df R14: 00007f209f7c5300 R15: 0000000000022000 INFO: task syz-executor.0:22163 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 D30080 22163 8160 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7f20a86740c9 Code: Bad RIP value. RSP: 002b:00007f209f7a4168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f20a8794120 RCX: 00007f20a86740c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f20a86cfae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaf5838df R14: 00007f209f7a4300 R15: 0000000000022000 INFO: task syz-executor.0:22170 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 D29472 22170 8160 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7f20a86740c9 Code: Bad RIP value. RSP: 002b:00007f209f783168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f20a87941f0 RCX: 00007f20a86740c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f20a86cfae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaf5838df R14: 00007f209f783300 R15: 0000000000022000 INFO: task syz-executor.0:22186 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 D24968 22186 8160 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7f20a86740c9 Code: Bad RIP value. RSP: 002b:00007f209f762168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f20a87942c0 RCX: 00007f20a86740c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f20a86cfae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffaf5838df R14: 00007f209f762300 R15: 0000000000022000 INFO: task syz-executor.5:22063 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 D25368 22063 8178 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7fbfdb9d90c9 Code: Bad RIP value. RSP: 002b:00007fbfd9f4b168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fbfdbaf8f80 RCX: 00007fbfdb9d90c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfdba34ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0174a3af R14: 00007fbfd9f4b300 R15: 0000000000022000 INFO: task syz-executor.5:22132 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 D26792 22132 8178 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7fbfdb9d90c9 Code: Bad RIP value. RSP: 002b:00007fbfd2b2a168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fbfdbaf9050 RCX: 00007fbfdb9d90c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfdba34ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0174a3af R14: 00007fbfd2b2a300 R15: 0000000000022000 INFO: task syz-executor.5:22146 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 D29920 22146 8178 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7fbfdb9d90c9 Code: Bad RIP value. RSP: 002b:00007fbfd2b09168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fbfdbaf9120 RCX: 00007fbfdb9d90c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfdba34ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0174a3af R14: 00007fbfd2b09300 R15: 0000000000022000 INFO: task syz-executor.5:22161 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 D29920 22161 8178 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 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 iterate_supers+0xdb/0x290 fs/super.c:631 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: 0033:0x7fbfdb9d90c9 Code: Bad RIP value. RSP: 002b:00007fbfd2ae8168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007fbfdbaf91f0 RCX: 00007fbfdb9d90c9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fbfdba34ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0174a3af R14: 00007fbfd2ae8300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1569: #0: 00000000d68ea3e5 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7840: #0: 00000000663bf1c8 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 2 locks held by kworker/u4:0/8232: #0: 0000000015162c1f ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x767/0x1570 kernel/workqueue.c:2124 #1: 0000000080d2711d ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x79c/0x1570 kernel/workqueue.c:2128 1 lock held by syz-executor.0/22029: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.0/22151: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.0/22163: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.0/22170: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.0/22186: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/22063: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/22132: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/22146: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/22161: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/22169: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 4 locks held by syz-executor.2/22077: #0: 0000000033c87883 (&type->s_umount_key#58/1){+.+.}, at: alloc_super fs/super.c:226 [inline] #0: 0000000033c87883 (&type->s_umount_key#58/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519 #1: 00000000497a2e5c (sb_writers#25){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #1: 00000000497a2e5c (sb_writers#25){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360 #2: 000000005ee99433 (&type->i_mutex_dir_key#13){++++}, at: inode_lock include/linux/fs.h:748 [inline] #2: 000000005ee99433 (&type->i_mutex_dir_key#13){++++}, at: vfs_removexattr+0xb2/0x240 fs/xattr.c:465 #3: 000000002dc7879a (&type->i_mutex_dir_key#13/3){+.+.}, at: inode_lock_nested include/linux/fs.h:783 [inline] #3: 000000002dc7879a (&type->i_mutex_dir_key#13/3){+.+.}, at: lookup_and_delete_xattr fs/reiserfs/xattr.c:484 [inline] #3: 000000002dc7879a (&type->i_mutex_dir_key#13/3){+.+.}, at: reiserfs_xattr_set_handle+0x7fd/0xb40 fs/reiserfs/xattr.c:527 2 locks held by syz-executor.2/22104: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: do_remount fs/namespace.c:2307 [inline] #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: do_mount+0xa5b/0x2f50 fs/namespace.c:2813 #1: 00000000f71ffbfd (&bdi->wb_switch_rwsem){+.+.}, at: bdi_down_write_wb_switch_rwsem fs/fs-writeback.c:338 [inline] #1: 00000000f71ffbfd (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0x9a0 fs/fs-writeback.c:2457 1 lock held by syz-executor.5/23792: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/23803: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/23808: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/23812: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/23823: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/23826: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24178: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24181: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24182: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24183: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24184: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 1 lock held by syz-executor.5/24187: #0: 00000000b6f4652a (&type->s_umount_key#77){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1569 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