syzbot

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WARNING: CPU: 0 PID: 0 at kernel/context_tracking.c:335 ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335

=============================
WARNING: suspicious RCU usage
5.19.0-rc3-next-20220620-syzkaller #0 Not tainted
-----------------------------
include/trace/events/lock.h:24 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
no locks held by swapper/0/0.

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-next-20220620-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 trace_lock_acquire include/trace/events/lock.h:24 [inline]
 lock_acquire.cold+0x1f/0x40 kernel/locking/lockdep.c:5636
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
 down_trylock+0xe/0x60 kernel/locking/semaphore.c:139
 __down_trylock_console_sem+0xfb/0x120 kernel/printk/printk.c:276
 console_trylock+0x13/0xd0 kernel/printk/printk.c:2731
 console_trylock_spinning kernel/printk/printk.c:2003 [inline]
 vprintk_emit+0x127/0x680 kernel/printk/printk.c:2403
 vprintk+0x80/0x90 kernel/printk/printk_safe.c:52
 _printk+0xba/0xed kernel/printk/printk.c:2425
 __warn+0x91/0x190 kernel/panic.c:611
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7bfca0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>

=============================
WARNING: suspicious RCU usage
5.19.0-rc3-next-20220620-syzkaller #0 Not tainted
-----------------------------
include/trace/events/lock.h:69 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0: ffffffff8bd75ed8 ((console_sem).lock){....}-{2:2}, at: down_trylock+0xe/0x60 kernel/locking/semaphore.c:139

stack backtrace:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-next-20220620-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 trace_lock_release include/trace/events/lock.h:69 [inline]
 lock_release.cold+0x1f/0x4e kernel/locking/lockdep.c:5676
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:149 [inline]
 _raw_spin_unlock_irqrestore+0x16/0x70 kernel/locking/spinlock.c:194
 down_trylock+0x45/0x60 kernel/locking/semaphore.c:143
 __down_trylock_console_sem+0xfb/0x120 kernel/printk/printk.c:276
 console_trylock+0x13/0xd0 kernel/printk/printk.c:2731
 console_trylock_spinning kernel/printk/printk.c:2003 [inline]
 vprintk_emit+0x127/0x680 kernel/printk/printk.c:2403
 vprintk+0x80/0x90 kernel/printk/printk_safe.c:52
 _printk+0xba/0xed kernel/printk/printk.c:2425
 __warn+0x91/0x190 kernel/panic.c:611
 report_bug+0x1bc/0x210 lib/bug.c:198
 handle_bug+0x3c/0x60 arch/x86/kernel/traps.c:316
 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:336
 asm_exc_invalid_op+0x1b/0x20 arch/x86/include/asm/idtentry.h:568
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7bfca0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.19.0-rc3-next-20220620-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:ct_idle_exit+0x34/0x40 kernel/context_tracking.c:335
Code: 00 02 00 00 31 ff 48 89 de 0f 1f 44 00 00 48 85 db 75 12 0f 1f 44 00 00 5b be 03 00 00 00 31 ff e9 01 fe ff ff 0f 1f 44 00 00 <0f> 0b eb e5 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 41 89 f4 55
RSP: 0018:ffffffff8ba07d90 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 0000000000000200 RCX: 0000000000000000
RDX: ffffffff8babc980 RSI: 0000000000000200 RDI: 0000000000000000
RBP: ffffffff8c7bfca0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000c000c1d000 CR3: 0000000016db0000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 cpuidle_enter_state+0x6f7/0xc80 drivers/cpuidle/cpuidle.c:240
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:352
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:236 [inline]
 do_idle+0x3e8/0x590 kernel/sched/idle.c:303
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:400
 rest_init+0x169/0x270 init/main.c:729
 arch_call_rest_init+0xf/0x14 init/main.c:886
 start_kernel+0x473/0x494 init/main.c:1142
 secondary_startup_64_no_verify+0xce/0xdb
 </TASK>