============================= WARNING: suspicious RCU usage 4.15.0+ #11 Not tainted ----------------------------- ./include/linux/rcupdate.h:302 Illegal context switch in RCU read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 3 locks held by syz-executor1/10957: #0: (&ctx->mutex){+.+.}, at: [<00000000351a161b>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1253 #1: (bpf_event_mutex){+.+.}, at: [<000000002b7ba0cb>] perf_event_query_prog_array+0x10e/0x280 kernel/trace/bpf_trace.c:876 #2: (rcu_read_lock){....}, at: [<000000008f89e887>] bpf_prog_array_copy_to_user+0x0/0x4d0 kernel/bpf/core.c:1568 stack backtrace: CPU: 1 PID: 10957 Comm: syz-executor1 Not tainted 4.15.0+ #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 lockdep_rcu_suspicious+0x123/0x170 kernel/locking/lockdep.c:4592 rcu_preempt_sleep_check include/linux/rcupdate.h:301 [inline] ___might_sleep+0x385/0x470 kernel/sched/core.c:6079 __might_sleep+0x95/0x190 kernel/sched/core.c:6067 __might_fault+0xab/0x1d0 mm/memory.c:4558 _copy_to_user+0x2c/0xc0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] bpf_prog_array_copy_to_user+0x217/0x4d0 kernel/bpf/core.c:1587 bpf_prog_array_copy_info+0x17b/0x1c0 kernel/bpf/core.c:1685 perf_event_query_prog_array+0x196/0x280 kernel/trace/bpf_trace.c:877 _perf_ioctl kernel/events/core.c:4737 [inline] perf_ioctl+0x3e1/0x1480 kernel/events/core.c:4757 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007fe0f158cc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe0f158d700 RCX: 0000000000453299 RDX: 000000002024f000 RSI: 00000000c008240a RDI: 0000000000000012 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 00007ffd7c9467cf R14: 00007fe0f158d9c0 R15: 0000000000000000 BUG: sleeping function called from invalid context at lib/usercopy.c:25 in_atomic(): 1, irqs_disabled(): 0, pid: 10957, name: syz-executor1 3 locks held by syz-executor1/10957: #0: (&ctx->mutex){+.+.}, at: [<00000000351a161b>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1253 #1: (bpf_event_mutex){+.+.}, at: [<000000002b7ba0cb>] perf_event_query_prog_array+0x10e/0x280 kernel/trace/bpf_trace.c:876 #2: (rcu_read_lock){....}, at: [<000000008f89e887>] bpf_prog_array_copy_to_user+0x0/0x4d0 kernel/bpf/core.c:1568 CPU: 1 PID: 10957 Comm: syz-executor1 Not tainted 4.15.0+ #11 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6114 __might_sleep+0x95/0x190 kernel/sched/core.c:6067 __might_fault+0xab/0x1d0 mm/memory.c:4558 _copy_to_user+0x2c/0xc0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] bpf_prog_array_copy_to_user+0x217/0x4d0 kernel/bpf/core.c:1587 bpf_prog_array_copy_info+0x17b/0x1c0 kernel/bpf/core.c:1685 perf_event_query_prog_array+0x196/0x280 kernel/trace/bpf_trace.c:877 _perf_ioctl kernel/events/core.c:4737 [inline] perf_ioctl+0x3e1/0x1480 kernel/events/core.c:4757 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x453299 RSP: 002b:00007fe0f158cc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe0f158d700 RCX: 0000000000453299 RDX: 000000002024f000 RSI: 00000000c008240a RDI: 0000000000000012 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 00007ffd7c9467cf R14: 00007fe0f158d9c0 R15: 0000000000000000 EXT4-fs (sda1): re-mounted. Opts: IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 cgroup: cgroup2: unknown option "" cgroup: cgroup2: unknown option "" overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' devpts: called with bogus options devpts: called with bogus options overlayfs: unrecognized mount option "—>”y/%FN²+yŸ@úXÌFÏ\%" or missing value overlayfs: unrecognized mount option "—>”y/%FN²+yŸ@úXÌFÏ\%" or missing value audit: type=1400 audit(1517981049.036:23): avc: denied { create } for pid=11620 comm="syz-executor5" scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=netlink_generic_socket permissive=1 IPVS: ftp: loaded support on port[0] = 21 9pnet_virtio: no channels available for device ./file0 9pnet_virtio: no channels available for device ./file0 can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. syz-executor3[11890] is installing a program with bpf_probe_write_user helper that may corrupt user memory! overlayfs: missing 'lowerdir' syz-executor3[11906] is installing a program with bpf_probe_write_user helper that may corrupt user memory! overlayfs: missing 'lowerdir' can: request_module (can-proto-0) failed. can: request_module (can-proto-0) failed. xprt_adjust_timeout: rq_timeout = 0! xprt_adjust_timeout: rq_timeout = 0!