sd 0:0:1:0: [sg0] tag#4608 CDB[10]: 92 1b da 40 b8 58 5b a8 d4 7d 34 f3 90 4c f1 2d sd 0:0:1:0: [sg0] tag#4538 CDB[20]: ba sd 0:0:1:0: [sg0] tag#4608 CDB[20]: ba Bearer rejected, not supported in standalone mode INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=1504, c=1503, q=139) All QSes seen, last rcu_preempt kthread activity 10502 (4294960853-4294950351), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.5 R running task 27848 9594 8007 0x00000000 Call Trace: sched_show_task.cold+0x333/0x39a kernel/sched/core.c:5168 print_other_cpu_stall kernel/rcu/tree.c:1501 [inline] check_cpu_stall kernel/rcu/tree.c:1616 [inline] __rcu_pending kernel/rcu/tree.c:3390 [inline] rcu_pending kernel/rcu/tree.c:3452 [inline] rcu_check_callbacks.cold+0xd29/0xd8d kernel/rcu/tree.c:2792 update_process_times+0x29/0x60 kernel/time/timer.c:1591 tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165 tick_sched_timer+0x92/0x200 kernel/time/tick-sched.c:1223 __run_hrtimer kernel/time/hrtimer.c:1223 [inline] __hrtimer_run_queues+0x30b/0xc80 kernel/time/hrtimer.c:1287 hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1079 [inline] smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1104 apic_timer_interrupt+0x93/0xa0 arch/x86/entry/entry_64.S:793 RIP: 0010:memcmp+0x4f/0xb0 lib/string.c:918 RSP: 0018:ffff8880559ff6a8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10 RAX: 0000000000000086 RBX: ffff8880559ff772 RCX: ffff8880a3eefc22 RDX: ffff8880a3eefc22 RSI: ffff8880a3eefc22 RDI: ffff8880559ff748 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880559f2300 R12: ffff8880559ff7a0 R13: 000000000000000b R14: ffff8880559ff748 R15: ffff8880a3eefbe0 find_stack lib/stackdepot.c:180 [inline] depot_save_stack+0x10d/0x3f0 lib/stackdepot.c:229 save_stack mm/kasan/kasan.c:453 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0x139/0x160 mm/kasan/kasan.c:551 slab_post_alloc_hook mm/slab.h:442 [inline] slab_alloc mm/slab.c:3390 [inline] kmem_cache_alloc_trace+0x11b/0x3d0 mm/slab.c:3616 kmalloc include/linux/slab.h:488 [inline] tty_alloc_file drivers/tty/tty_io.c:186 [inline] tty_open+0x11a/0x8b0 drivers/tty/tty_io.c:2015 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fd8826d4049 RSP: 002b:00007fd881049168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fd8827e6f60 RCX: 00007fd8826d4049 RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007fd88272e08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffef24c69bf R14: 00007fd881049300 R15: 0000000000022000 rcu_preempt kthread starved for 10502 jiffies! g1504 c1503 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x402 ->cpu=1 rcu_preempt I30008 8 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:3511 ___preempt_schedule+0x16/0x18 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline] _raw_spin_unlock_irqrestore+0xaf/0xe0 kernel/locking/spinlock.c:192 prepare_to_swait+0x115/0x2a0 kernel/sched/swait.c:84 prepare_to_swait_event+0x40/0xb0 kernel/sched/swait.c:93 rcu_gp_kthread+0xc1d/0x1e60 kernel/rcu/tree.c:2255 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404