FAT-fs (loop3): bogus number of FAT structure FAT-fs (loop3): Can't find a valid FAT filesystem isofs_fill_super: bread failed, dev=loop7, iso_blknum=16, block=32 kworker/dying (7) used greatest stack depth: 23608 bytes left INFO: task syz-executor.1:6065 blocked for more than 143 seconds. Not tainted 5.10.188 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:27952 pid: 6065 ppid: 284 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:3800 [inline] __schedule+0x824/0x1ea0 kernel/sched/core.c:4548 schedule+0xcb/0x270 kernel/sched/core.c:4626 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4685 __mutex_lock_common kernel/locking/mutex.c:1047 [inline] __mutex_lock+0x7a8/0x10b0 kernel/locking/mutex.c:1109 perf_event_init_context kernel/events/core.c:12906 [inline] perf_event_init_task+0x25a/0x800 kernel/events/core.c:12981 copy_process+0x180b/0x6740 kernel/fork.c:2092 kernel_clone+0xe7/0x980 kernel/fork.c:2503 __do_sys_clone+0xc8/0x110 kernel/fork.c:2620 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fb8387a6f41 RSP: 002b:00007ffe520dfd48 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb835cd9700 RCX: 00007fb8387a6f41 RDX: 00007fb835cd99d0 RSI: 00007fb835cd92f0 RDI: 00000000003d0f00 RBP: 00007ffe520dff80 R08: 00007fb835cd9700 R09: 00007fb835cd9700 R10: 00007fb835cd99d0 R11: 0000000000000206 R12: 00007ffe520dfdfe R13: 00007ffe520dfdff R14: 00007fb835cd9300 R15: 0000000000022000 INFO: task syz-executor.1:6073 blocked for more than 143 seconds. Not tainted 5.10.188 #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:29496 pid: 6073 ppid: 284 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:3800 [inline] __schedule+0x824/0x1ea0 kernel/sched/core.c:4548 schedule+0xcb/0x270 kernel/sched/core.c:4626 schedule_preempt_disabled+0xc/0x20 kernel/sched/core.c:4685 __mutex_lock_common kernel/locking/mutex.c:1047 [inline] __mutex_lock+0x7a8/0x10b0 kernel/locking/mutex.c:1109 mutex_lock_double kernel/events/core.c:11598 [inline] __perf_event_ctx_lock_double kernel/events/core.c:11742 [inline] __do_sys_perf_event_open+0x1248/0x2d50 kernel/events/core.c:12015 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xc6 RIP: 0033:0x7fb8387a5b19 RSP: 002b:00007fb835cfa188 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007fb8388b9020 RCX: 00007fb8387a5b19 RDX: 0000000000000000 RSI: 00000000000000e0 RDI: 0000000020000000 RBP: 00007fb8387fff6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe520dfdff R14: 00007fb835cfa300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/22: #0: ffffffff84ff7ca0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x27b kernel/locking/lockdep.c:6390 1 lock held by in:imklog/178: #0: ffff88800ca55770 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xed/0x110 fs/file.c:1018 1 lock held by syz-executor.1/6065: #0: ffff8880483ed0b0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_init_context kernel/events/core.c:12906 [inline] #0: ffff8880483ed0b0 (&ctx->mutex){+.+.}-{3:3}, at: perf_event_init_task+0x25a/0x800 kernel/events/core.c:12981 3 locks held by syz-executor.1/6073: #0: ffff88800bf11fd8 (&sig->exec_update_lock){++++}-{3:3}, at: __do_sys_perf_event_open+0xfc5/0x2d50 kernel/events/core.c:11997 #1: ffff8880483ed0b0 (&ctx->mutex){+.+.}-{3:3}, at: mutex_lock_double kernel/events/core.c:11597 [inline] #1: ffff8880483ed0b0 (&ctx->mutex){+.+.}-{3:3}, at: __perf_event_ctx_lock_double kernel/events/core.c:11742 [inline] #1: ffff8880483ed0b0 (&ctx->mutex){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x123b/0x2d50 kernel/events/core.c:12015 #2: ffff8880483ed0b0 (&ctx->mutex/1){+.+.}-{3:3}, at: mutex_lock_double kernel/events/core.c:11598 [inline] #2: ffff8880483ed0b0 (&ctx->mutex/1){+.+.}-{3:3}, at: __perf_event_ctx_lock_double kernel/events/core.c:11742 [inline] #2: ffff8880483ed0b0 (&ctx->mutex/1){+.+.}-{3:3}, at: __do_sys_perf_event_open+0x1248/0x2d50 kernel/events/core.c:12015 =============================================