------------[ cut here ]------------ WARNING: CPU: 1 PID: 7 at lib/percpu-refcount.c:113 __percpu_ref_exit+0x78/0x7c lib/percpu-refcount.c:113 Modules linked in: Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 5.12.0-rc3-syzkaller #0 Hardware name: ARM-Versatile Express Workqueue: events_unbound io_ring_exit_work Backtrace: [<81802550>] (dump_backtrace) from [<818027c4>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:252) r7:00000080 r6:60000093 r5:00000000 r4:82b58344 [<818027ac>] (show_stack) from [<81809e98>] (__dump_stack lib/dump_stack.c:79 [inline]) [<818027ac>] (show_stack) from [<81809e98>] (dump_stack+0xb8/0xe8 lib/dump_stack.c:120) [<81809de0>] (dump_stack) from [<81803358>] (panic+0x130/0x378 kernel/panic.c:231) r7:81f48198 r6:82a390a4 r5:00000000 r4:82c6b0d0 [<81803228>] (panic) from [<802446f4>] (__warn+0xb0/0x164 kernel/panic.c:605) r3:82a2248c r2:00000000 r1:821137b8 r0:81f48198 r7:00000071 [<80244644>] (__warn) from [<81803608>] (warn_slowpath_fmt+0x68/0xd4 kernel/panic.c:628) r7:807f3158 r6:00000071 r5:81fa0208 r4:00000000 [<818035a4>] (warn_slowpath_fmt) from [<807f3158>] (__percpu_ref_exit+0x78/0x7c lib/percpu-refcount.c:113) r8:86bf7b40 r7:81f744cc r6:86c940c0 r5:a40693b0 r4:86c94000 [<807f30e0>] (__percpu_ref_exit) from [<807f3174>] (percpu_ref_exit+0x18/0x64 lib/percpu-refcount.c:134) r5:86bf75c0 r4:86c94000 [<807f315c>] (percpu_ref_exit) from [<80561c8c>] (io_ring_ctx_free fs/io_uring.c:8419 [inline]) [<807f315c>] (percpu_ref_exit) from [<80561c8c>] (io_ring_exit_work+0x304/0x4cc fs/io_uring.c:8565) r5:86c94544 r4:86c94318 [<80561988>] (io_ring_exit_work) from [<80269484>] (process_one_work+0x2d4/0x998 kernel/workqueue.c:2275) r10:00000088 r9:82a22498 r8:82bfd34e r7:83416000 r6:83420000 r5:8348e780 r4:86c94544 [<802691b0>] (process_one_work) from [<80269bac>] (worker_thread+0x64/0x54c kernel/workqueue.c:2421) r10:00000088 r9:8350a000 r8:82a06d00 r7:83420038 r6:8348e794 r5:83420000 r4:8348e780 [<80269b48>] (worker_thread) from [<80271d20>] (kthread+0x184/0x1a4 kernel/kthread.c:292) r10:834dfe34 r9:8348e780 r8:80269b48 r7:00000000 r6:8350a000 r5:834a3e40 r4:8348e800 [<80271b9c>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:158) Exception stack(0x8350bfb0 to 0x8350bff8) bfa0: 00000000 00000000 00000000 00000000 bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80271b9c r4:834a3e40 Rebooting in 86400 seconds..