EXT4-fs error (device loop4): ext4_free_inode:350: comm syz-executor.4: bit already cleared for inode 15
audit: type=1800 audit(1675593447.851:1935): pid=333 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="loop2" ino=4782 res=0
INFO: task syz-executor.2:25057 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  D28392 25057  21781 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: 0033:0x7f03d58580c9
Code: Bad RIP value.
RSP: 002b:00007f03d3d88168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f03d5978120 RCX: 00007f03d58580c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f03d58b3ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc6bcb5a9f R14: 00007f03d3d88300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1569:
 #0: 000000001c5842e0 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
2 locks held by agetty/8020:
 #0: 000000007e755f6b (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272
 #1: 00000000d2524038 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x1950 drivers/tty/n_tty.c:2154
1 lock held by syz-executor.1/23022:
 #0: 00000000e87cfbb7 (&type->s_umount_key#50/1){+.+.}, at: alloc_super fs/super.c:226 [inline]
 #0: 00000000e87cfbb7 (&type->s_umount_key#50/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519
1 lock held by syz-executor.4/23462:
 #0: 0000000034f48297 (&type->s_umount_key#50/1){+.+.}, at: alloc_super fs/super.c:226 [inline]
 #0: 0000000034f48297 (&type->s_umount_key#50/1){+.+.}, at: sget_userns+0x20b/0xcd0 fs/super.c:519
1 lock held by syz-executor.2/25057:
 #0: 00000000e87cfbb7 (&type->s_umount_key#84){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631
2 locks held by kworker/u4:7/28270:
 #0: 00000000c0c0caf1 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9702 [inline]
 #0: 00000000c0c0caf1 (&rq->lock){-.-.}, at: pick_next_task_fair+0x556/0x1570 kernel/sched/fair.c:6841
 #1: 000000001c5842e0 (rcu_read_lock){....}, at: cpu_of kernel/sched/sched.h:923 [inline]
 #1: 000000001c5842e0 (rcu_read_lock){....}, at: __update_idle_core+0x39/0x3e0 kernel/sched/fair.c:6057
1 lock held by syz-executor.1/32763:
 #0: 00000000e87cfbb7 (&type->s_umount_key#84){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631
1 lock held by syz-executor.1/302:
 #0: 00000000e87cfbb7 (&type->s_umount_key#84){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631
1 lock held by syz-executor.1/314:
 #0: 00000000e87cfbb7 (&type->s_umount_key#84){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631
1 lock held by syz-executor.1/373:
 #0: 00000000e87cfbb7 (&type->s_umount_key#84){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1569 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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 4688 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:qlink_to_object mm/kasan/quarantine.c:136 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:141 [inline]
RIP: 0010:qlist_free_all+0x32/0x140 mm/kasan/quarantine.c:166
Code: 55 53 48 8b 1f 48 85 db 0f 84 08 01 00 00 48 89 f5 49 89 fd 48 85 ed 49 89 ee 0f 84 8b 00 00 00 49 63 86 fc 00 00 00 4c 8b 23 <48> 29 c3 48 83 3d 93 10 59 08 00 0f 84 e6 00 00 00 9c 58 0f 1f 44
RSP: 0018:ffff8880a0c97b18 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88809cd29a10 RCX: ffffea000118e987
RDX: 0000000000000000 RSI: ffffffff812b5eca RDI: 0000000000000007
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000000 R12: ffff8880a0c3d850
R13: ffff8880a0c97b50 R14: ffff88823b833640 R15: 0000000000000286
FS:  00007f6c667268c0(0000) GS:ffff8880ba100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6c62238000 CR3: 00000000a2c44000 CR4: 00000000003406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x1a9/0x230 mm/kasan/quarantine.c:259
 kasan_kmalloc+0xa2/0x160 mm/kasan/kasan.c:538
 slab_post_alloc_hook mm/slab.h:445 [inline]
 slab_alloc mm/slab.c:3397 [inline]
 kmem_cache_alloc+0x110/0x370 mm/slab.c:3557
 getname_flags+0xce/0x590 fs/namei.c:140
 do_sys_open+0x26c/0x520 fs/open.c:1079
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f6c65cb585d
Code: bb 20 00 00 75 10 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 67 f6 ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffe6b017c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007ffe6b017f70 RCX: 00007f6c65cb585d
RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005572e1d45d20
RBP: 000000000000000d R08: 0000000000000000 R09: 00000000ffffffff
R10: 0000000000000069 R11: 0000000000000293 R12: 00000000ffffffff
R13: 00005572e1d42040 R14: 00007ffe6b017f30 R15: 00005572e1d4f510