------------[ cut here ]------------
WARNING: CPU: 1 PID: 13007 at kernel/events/core.c:3752 ctx_sched_in+0x12e/0x3ee kernel/events/core.c:3752
Modules linked in:
CPU: 1 PID: 13007 Comm: syz-executor.0 Not tainted 5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0
Hardware name: riscv-virtio,qemu (DT)
epc : ctx_sched_in+0x12e/0x3ee kernel/events/core.c:3752
 ra : ctx_sched_in+0x12e/0x3ee kernel/events/core.c:3752
epc : ffffffe00027a674 ra : ffffffe00027a674 sp : ffffffe0216138b0
 gp : ffffffe0045883c0 tp : ffffffe00576df00 t0 : 0000000000000000
 t1 : 0000000000000001 t2 : 00000000000f4240 s0 : ffffffe021613920
 s1 : ffffffe025640000 a0 : ffffffe066d76fa8 a1 : 00000000000f0000
 a2 : 0000000000000002 a3 : ffffffe00027a674 a4 : ffffffe00576ef00
 a5 : 0000000040000002 a6 : 0000000000f00000 a7 : ffffffe000281354
 s2 : 0000000000000007 s3 : ffffffe025640140 s4 : ffffffe00576df00
 s5 : 0000000000000002 s6 : ffffffe00458c0d0 s7 : ffffffe066d76e00
 s8 : 0000000000000007 s9 : ffffffe066d76fa8 s10: ffffffe025640000
 s11: ffffffe025640008 t3 : 93263327a8204c00 t4 : 0000000000000584
 t5 : ffffffc404a34efd t6 : 0000000000000003
status: 0000000000000100 badaddr: 0000000000000000 cause: 0000000000000003
Call Trace:
[<ffffffe00027a674>] ctx_sched_in+0x12e/0x3ee kernel/events/core.c:3752
[<ffffffe00027a96c>] perf_event_sched_in+0x38/0x74 kernel/events/core.c:2680
[<ffffffe00028142e>] perf_event_context_sched_in kernel/events/core.c:3817 [inline]
[<ffffffe00028142e>] __perf_event_task_sched_in+0x4ea/0x680 kernel/events/core.c:3860
[<ffffffe0000850ce>] perf_event_task_sched_in include/linux/perf_event.h:1210 [inline]
[<ffffffe0000850ce>] finish_task_switch.isra.0+0x284/0x318 kernel/sched/core.c:4189
[<ffffffe002a932b0>] context_switch kernel/sched/core.c:4325 [inline]
[<ffffffe002a932b0>] __schedule+0x484/0xe8c kernel/sched/core.c:5073
[<ffffffe002a945d4>] preempt_schedule_irq+0x4a/0x13e kernel/sched/core.c:5530
[<ffffffe00000563a>] resume_kernel+0x16/0x18
irq event stamp: 160
hardirqs last  enabled at (159): [<ffffffe002a945ca>] preempt_schedule_irq+0x40/0x13e kernel/sched/core.c:5529
hardirqs last disabled at (160): [<ffffffe002a93338>] __schedule+0x50c/0xe8c kernel/sched/core.c:4972
softirqs last  enabled at (146): [<ffffffe002a9b578>] __do_softirq+0x5e0/0x8c4 kernel/softirq.c:372
softirqs last disabled at (141): [<ffffffe00003507e>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline]
softirqs last disabled at (141): [<ffffffe00003507e>] invoke_softirq kernel/softirq.c:228 [inline]
softirqs last disabled at (141): [<ffffffe00003507e>] __irq_exit_rcu kernel/softirq.c:422 [inline]
softirqs last disabled at (141): [<ffffffe00003507e>] irq_exit+0x1a0/0x1b6 kernel/softirq.c:446
---[ end trace b8b0f0192fc31827 ]---

=============================
WARNING: suspicious RCU usage
5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0 Tainted: G        W        
-----------------------------
kernel/sched/core.c:8294 Illegal context switch in RCU-bh read-side critical section!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 0
3 locks held by syz-executor.0/13007:
 #0: ffffffe066d76e20 (&cpuctx_lock){-.-.}-{2:2}, at: perf_ctx_lock kernel/events/core.c:165 [inline]
 #0: ffffffe066d76e20 (&cpuctx_lock){-.-.}-{2:2}, at: perf_event_context_sched_in kernel/events/core.c:3798 [inline]
 #0: ffffffe066d76e20 (&cpuctx_lock){-.-.}-{2:2}, at: __perf_event_task_sched_in+0x406/0x680 kernel/events/core.c:3860
 #1: ffffffe025640020 (&ctx->lock){-...}-{2:2}, at: perf_ctx_lock kernel/events/core.c:167 [inline]
 #1: ffffffe025640020 (&ctx->lock){-...}-{2:2}, at: perf_event_context_sched_in kernel/events/core.c:3798 [inline]
 #1: ffffffe025640020 (&ctx->lock){-...}-{2:2}, at: __perf_event_task_sched_in+0x410/0x680 kernel/events/core.c:3860
 #2: ffffffe004249f18 (console_lock){+.+.}-{0:0}, at: vprintk_default+0x22/0x2e kernel/printk/printk.c:2115

stack backtrace:
CPU: 1 PID: 13007 Comm: syz-executor.0 Tainted: G        W         5.12.0-rc8-syzkaller-00011-g18a3c5f7abfd #0
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
[<ffffffe000009708>] walk_stackframe+0x0/0x23c arch/riscv/kernel/traps.c:202
[<ffffffe002a5dd2a>] dump_backtrace+0x40/0x4e arch/riscv/kernel/stacktrace.c:113
[<ffffffe002a5dd5a>] show_stack+0x22/0x2e arch/riscv/kernel/stacktrace.c:118
[<ffffffe002a67574>] __dump_stack lib/dump_stack.c:79 [inline]
[<ffffffe002a67574>] dump_stack+0x148/0x1d8 lib/dump_stack.c:120
[<ffffffe002a5f69c>] lockdep_rcu_suspicious+0xcc/0xdc kernel/locking/lockdep.c:6429
[<ffffffe000084458>] ___might_sleep+0x132/0x2c0 kernel/sched/core.c:8294
[<ffffffe000084640>] __might_sleep+0x5a/0x8a kernel/sched/core.c:8282
[<ffffffe002a95e22>] __mutex_lock_common kernel/locking/mutex.c:928 [inline]
[<ffffffe002a95e22>] __mutex_lock+0x56/0x99e kernel/locking/mutex.c:1096
[<ffffffe002a9677e>] mutex_lock_nested+0x14/0x1c kernel/locking/mutex.c:1111
[<ffffffe000270f60>] perf_event_ctx_lock_nested+0x18c/0x332 kernel/events/core.c:1360
[<ffffffe00028a98e>] perf_event_ctx_lock kernel/events/core.c:1373 [inline]
[<ffffffe00028a98e>] perf_ioctl+0x4c/0x84 kernel/events/core.c:5596
[<ffffffe000424a2e>] vfs_ioctl fs/ioctl.c:48 [inline]
[<ffffffe000424a2e>] __do_sys_ioctl fs/ioctl.c:753 [inline]
[<ffffffe000424a2e>] sys_ioctl+0x5c2/0xd56 fs/ioctl.c:739
[<ffffffe000005578>] ret_from_syscall+0x0/0x2