sd 0:0:1:0: [sg0] tag#2171 CDB: opcode=0xe5 (vendor) sd 0:0:1:0: [sg0] tag#2171 CDB[00]: e5 f4 32 73 2f 4e 09 6d 26 e2 c7 35 d1 35 12 1c sd 0:0:1:0: [sg0] tag#2171 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#2171 CDB[20]: ba rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=30797, q=393) rcu: All QSes seen, last rcu_preempt kthread activity 10492 (4294974889-4294964397), jiffies_till_next_fqs=1, root ->qsmask 0x0 syz-executor.2 R running task 26816 16149 8130 0x00000000 Call Trace: sched_show_task.cold+0x332/0x396 kernel/sched/core.c:5337 print_other_cpu_stall kernel/rcu/tree.c:1430 [inline] check_cpu_stall kernel/rcu/tree.c:1557 [inline] __rcu_pending kernel/rcu/tree.c:3293 [inline] rcu_pending kernel/rcu/tree.c:3336 [inline] rcu_check_callbacks.cold+0xb37/0xe19 kernel/rcu/tree.c:2682 update_process_times+0x2a/0x70 kernel/time/timer.c:1650 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:168 tick_sched_timer+0xfc/0x290 kernel/time/tick-sched.c:1278 __run_hrtimer kernel/time/hrtimer.c:1465 [inline] __hrtimer_run_queues+0x3f6/0xe60 kernel/time/hrtimer.c:1527 hrtimer_interrupt+0x326/0x9e0 kernel/time/hrtimer.c:1585 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1071 [inline] smp_apic_timer_interrupt+0x10c/0x550 arch/x86/kernel/apic/apic.c:1096 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:deref_stack_reg+0x17e/0x1d0 arch/x86/kernel/unwind_orc.c:336 Code: 00 00 48 ba 00 00 00 00 00 fc ff df 48 c7 04 13 00 00 00 00 48 8b 4c 24 60 65 48 2b 0c 25 28 00 00 00 75 47 48 83 c4 68 5b 5d <41> 5c 41 5d 41 5e c3 e8 26 e1 6e 00 e9 ec fe ff ff e8 ac e1 6e 00 RSP: 0018:ffff8880aa6f7498 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 1ffff110154deea0 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: ffff8880aa6f7448 RDI: ffff8880aa6f7f50 RBP: 0000000000000001 R08: ffffffff8b8cd908 R09: ffffffff8b8cd904 R10: ffff8880aa6f7647 R11: 0000000000074071 R12: ffff8880aa6f75e8 R13: ffff8880aa6f7630 R14: ffff8880aa6f0000 R15: ffffffff8b8cd904 unwind_next_frame+0x9fc/0x1400 arch/x86/kernel/unwind_orc.c:502 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 kmem_cache_alloc_trace+0x12f/0x380 mm/slab.c:3625 kmalloc include/linux/slab.h:515 [inline] tty_alloc_file drivers/tty/tty_io.c:187 [inline] tty_open+0x138/0x990 drivers/tty/tty_io.c:2023 chrdev_open+0x266/0x770 fs/char_dev.c:423 do_dentry_open+0x4aa/0x1160 fs/open.c:796 do_last fs/namei.c:3421 [inline] path_openat+0x793/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fbb2aa73049 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fbb293e8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fbb2ab85f60 RCX: 00007fbb2aa73049 RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c RBP: 00007fbb2aacd08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc5d1cbdbf R14: 00007fbb293e8300 R15: 0000000000022000 rcu: rcu_preempt kthread starved for 10492 jiffies! g30797 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29208 10 2 0x80000000 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 schedule_timeout+0x4cf/0xfe0 kernel/time/timer.c:1818 rcu_gp_kthread+0xdad/0x21c0 kernel/rcu/tree.c:2202 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 9: fc ff df c: 48 c7 04 13 00 00 00 movq $0x0,(%rbx,%rdx,1) 13: 00 14: 48 8b 4c 24 60 mov 0x60(%rsp),%rcx 19: 65 48 2b 0c 25 28 00 sub %gs:0x28,%rcx 20: 00 00 22: 75 47 jne 0x6b 24: 48 83 c4 68 add $0x68,%rsp 28: 5b pop %rbx 29: 5d pop %rbp * 2a: 41 5c pop %r12 <-- trapping instruction 2c: 41 5d pop %r13 2e: 41 5e pop %r14 30: c3 retq 31: e8 26 e1 6e 00 callq 0x6ee15c 36: e9 ec fe ff ff jmpq 0xffffff27 3b: e8 ac e1 6e 00 callq 0x6ee1ec