EXT4-fs (loop3): VFS: Found ext4 filesystem with unknown checksum algorithm.
EXT4-fs warning (device loop3): ext4_fill_super:4097: metadata_csum and uninit_bg are redundant flags; please run fsck.
EXT4-fs (loop3): VFS: Found ext4 filesystem with unknown checksum algorithm.
INFO: task syz-executor.5:6128 blocked for more than 143 seconds.
      Not tainted 5.10.60 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:27904 pid: 6128 ppid:   285 flags:0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x84b/0x1e90 kernel/sched/core.c:4523
 schedule+0xcb/0x270 kernel/sched/core.c:4601
 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4660
 __mutex_lock_common kernel/locking/mutex.c:1046 [inline]
 __mutex_lock+0x828/0x12e0 kernel/locking/mutex.c:1114
 perf_event_init_context kernel/events/core.c:12799 [inline]
 perf_event_init_task+0x24d/0x7c0 kernel/events/core.c:12874
 copy_process+0x1751/0x64e0 kernel/fork.c:2078
 kernel_clone+0xe7/0xa20 kernel/fork.c:2465
 __do_sys_clone+0xc8/0x110 kernel/fork.c:2582
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x467a31
RSP: 002b:00007ffe150f3258 EFLAGS: 00000206 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007f1dc7190700 RCX: 0000000000467a31
RDX: 00007f1dc71909d0 RSI: 00007f1dc71902f0 RDI: 00000000003d0f00
RBP: 00007ffe150f3490 R08: 00007f1dc7190700 R09: 00007f1dc7190700
R10: 00007f1dc71909d0 R11: 0000000000000206 R12: 00007ffe150f330e
R13: 00007ffe150f330f R14: 00007f1dc7190300 R15: 0000000000022000
INFO: task syz-executor.5:6130 blocked for more than 143 seconds.
      Not tainted 5.10.60 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.5  state:D stack:27872 pid: 6130 ppid:   285 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:3774 [inline]
 __schedule+0x84b/0x1e90 kernel/sched/core.c:4523
 schedule+0xcb/0x270 kernel/sched/core.c:4601
 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4660
 __mutex_lock_common kernel/locking/mutex.c:1046 [inline]
 __mutex_lock+0x828/0x12e0 kernel/locking/mutex.c:1114
 mutex_lock_double kernel/events/core.c:11593 [inline]
 __perf_event_ctx_lock_double kernel/events/core.c:11652 [inline]
 __do_sys_perf_event_open+0x1234/0x2c80 kernel/events/core.c:11922
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x466609
RSP: 002b:00007f1dc71f4188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 0000000000466609
RDX: 0000000000000000 RSI: 00000000000000b8 RDI: 0000000020001d80
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffe150f330f R14: 00007f1dc71f4300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/22:
 #0: ffffffff84df66e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6377
2 locks held by in:imklog/179:
 #0: ffff88800c8a79f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:930
 #1: ffffffff84df66e0 (rcu_read_lock){....}-{1:2}, at: __is_insn_slot_addr+0x0/0x250 kernel/kprobes.c:280
1 lock held by syz-executor.5/6128:
 #0: ffff888043ea9cb0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_init_context kernel/events/core.c:12799 [inline]
 #0: ffff888043ea9cb0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_init_task+0x24d/0x7c0 kernel/events/core.c:12874
3 locks held by syz-executor.5/6130:
 #0: ffff88801e942cd8 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open+0xfbf/0x2c80 kernel/events/core.c:11904
 #1: ffff888043ea9cb0 (&ctx->mutex){+.+.}-{3:3}, at: mutex_lock_double kernel/events/core.c:11592 [inline]
 #1: ffff888043ea9cb0 (&ctx->mutex){+.+.}-{3:3}, at: __perf_event_ctx_lock_double kernel/events/core.c:11652 [inline]
 #1: ffff888043ea9cb0 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x1227/0x2c80 kernel/events/core.c:11922
 #2: ffff888043ea9cb0 (&ctx->mutex/1){+.+.}-{3:3}, at: mutex_lock_double kernel/events/core.c:11593 [inline]
 #2: ffff888043ea9cb0 (&ctx->mutex/1){+.+.}-{3:3}, at: __perf_event_ctx_lock_double kernel/events/core.c:11652 [inline]
 #2: ffff888043ea9cb0 (&ctx->mutex/1){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x1234/0x2c80 kernel/events/core.c:11922

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