syzbot


WARNING in scheduler_tick

Status: upstream: reported on 2024/03/30 13:19
Subsystems: kernel
[Documentation on labels]
Reported-by: syzbot+effa8aeb3d011d4d4c78@syzkaller.appspotmail.com
First crash: 21d, last: 21d
Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [kernel?] WARNING in scheduler_tick 0 (1) 2024/03/30 13:19

Sample crash report:
------------[ cut here ]------------
================================
WARNING: CPU: 2 PID: 0 at kernel/softirq.c:362 __local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
WARNING: inconsistent lock state
Modules linked in:
6.9.0-rc1-syzkaller-00005-g928a87efa423 #0 Not tainted
CPU: 2 PID: 0 Comm: swapper/2 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0
--------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
swapper/0/0 [HC0[0]:SC0[0]:HE0:SE1] takes:
ffff88802c23e718 (&rq->__lock){?.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
{IN-HARDIRQ-W} state was registered at:
  lock_acquire kernel/locking/lockdep.c:5754 [inline]
  lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
  _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378
RIP: 0010:__local_bh_enable_ip+0xc3/0x120 kernel/softirq.c:362
  raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
Code: 00 e8 21 56 0b 00 e8 bc 54 42 00 fb 65 8b 05 9c fd b0 7e 85 c0 74 52 5b 5d c3 cc cc cc cc 65 8b 05 9e b1 af 7e 85 c0 75 9e 90 <0f> 0b 90 eb 98 e8 c3 52 42 00 eb 99 48 89 ef e8 09 cf 19 00 eb a2
  raw_spin_rq_lock kernel/sched/sched.h:1385 [inline]
  rq_lock kernel/sched/sched.h:1699 [inline]
  scheduler_tick+0xa2/0x650 kernel/sched/core.c:5679
RSP: 0018:ffffc90000477b20 EFLAGS: 00010046
  update_process_times+0x199/0x220 kernel/time/timer.c:2491

  tick_periodic+0x7e/0x230 kernel/time/tick-common.c:100
RAX: 0000000000000000 RBX: 0000000000000201 RCX: 1ffffffff1f3f383
  tick_handle_periodic+0x45/0x120 kernel/time/tick-common.c:112
RDX: 0000000000000000 RSI: 0000000000000201 RDI: ffffffff88ce4ce8
  timer_interrupt+0x4e/0x80 arch/x86/kernel/time.c:57
RBP: ffffffff88ce4ce8 R08: 0000000000000000 R09: ffffed1008f71301
R10: ffff888047b8980b R11: 0000000000000002 R12: dffffc0000000000
  __handle_irq_event_percpu+0x22c/0x7c0 kernel/irq/handle.c:158
R13: ffff8880259f8c00 R14: 0000000000000000 R15: 0000000000000004
  handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
  handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
FS:  0000000000000000(0000) GS:ffff88802c400000(0000) knlGS:0000000000000000
  handle_level_irq+0x25d/0x6f0 kernel/irq/chip.c:648
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
  handle_irq arch/x86/kernel/irq.c:238 [inline]
  __common_interrupt+0xe1/0x250 arch/x86/kernel/irq.c:257
CR2: 0000000031a23000 CR3: 000000005da20000 CR4: 0000000000350ef0
  common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
  _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Call Trace:
  __setup_irq+0x1069/0x1e80 kernel/irq/manage.c:1818
 <TASK>
  request_threaded_irq+0x2b4/0x3e0 kernel/irq/manage.c:2202
  request_irq include/linux/interrupt.h:168 [inline]
  setup_default_timer_irq arch/x86/kernel/time.c:70 [inline]
  hpet_time_init+0x5b/0x90 arch/x86/kernel/time.c:82
  x86_late_time_init+0x51/0xc0 arch/x86/kernel/time.c:94
  start_kernel+0x317/0x490 init/main.c:1036
  x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507
  x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488
  common_startup_64+0x13e/0x148
irq event stamp: 622080
hardirqs last  enabled at (622077): [<ffffffff817fbbd1>] tick_nohz_idle_exit+0x1c1/0x2e0 kernel/time/tick-sched.c:1465
hardirqs last disabled at (622078): [<ffffffff8ad6c44a>] __schedule+0x290a/0x5d00 kernel/sched/core.c:6634
softirqs last  enabled at (622080): [<ffffffff88ce4ce8>] spin_unlock_bh include/linux/spinlock.h:396 [inline]
softirqs last  enabled at (622080): [<ffffffff88ce4ce8>] sock_hash_delete_elem+0x2b8/0x360 net/core/sock_map.c:947
softirqs last disabled at (622079): [<ffffffff88ce4b04>] spin_lock_bh include/linux/spinlock.h:356 [inline]
softirqs last disabled at (622079): [<ffffffff88ce4b04>] sock_hash_delete_elem+0xd4/0x360 net/core/sock_map.c:939
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 sock_hash_delete_elem+0x2b8/0x360 net/core/sock_map.c:947

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
 bpf_prog_2fe495d516d5c300+0x45/0x49
  lock(&rq->__lock);
 bpf_dispatcher_nop_func include/linux/bpf.h:1234 [inline]
 __bpf_prog_run include/linux/filter.h:657 [inline]
 bpf_prog_run include/linux/filter.h:664 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2381 [inline]
 bpf_trace_run4+0x176/0x460 kernel/trace/bpf_trace.c:2422
  <Interrupt>
    lock(&rq->__lock
);

 *** DEADLOCK ***

2 locks held by swapper/0/0:
 #0: ffff88802c23e718
 trace_sched_switch include/trace/events/sched.h:222 [inline]
 __schedule+0x252c/0x5d00 kernel/sched/core.c:6743
 (&rq->__lock){?.-.}-{2:2}
, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
 #1: ffffffff8d7b4b60
 (rcu_read_lock
){....}-{1:2}
, at: rcu_lock_acquire include/linux/rcupdate.h:329 [inline]
, at: rcu_read_lock include/linux/rcupdate.h:781 [inline]
, at: __bpf_trace_run kernel/trace/bpf_trace.c:2380 [inline]
, at: bpf_trace_run4+0x107/0x460 kernel/trace/bpf_trace.c:2422

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.9.0-rc1-syzkaller-00005-g928a87efa423 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
 schedule_idle+0x59/0x90 kernel/sched/core.c:6864
Call Trace:
 do_idle+0x287/0x3f0 kernel/sched/idle.c:360
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
 print_usage_bug kernel/locking/lockdep.c:3971 [inline]
 valid_state kernel/locking/lockdep.c:4013 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4216 [inline]
 mark_lock+0x923/0xc60 kernel/locking/lockdep.c:4678
 start_secondary+0x220/0x2b0 arch/x86/kernel/smpboot.c:313
 common_startup_64+0x13e/0x148
 </TASK>

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/03/26 13:08 upstream 928a87efa423 bcd9b39f .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 WARNING in scheduler_tick
* Struck through repros no longer work on HEAD.