============================= WARNING: suspicious RCU usage 4.15.0+ #10 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-executor5/7677: #0: (&ctx->mutex){+.+.}, at: [<000000007b58e844>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1253 #1: (bpf_event_mutex){+.+.}, at: [<000000000e61e24f>] perf_event_query_prog_array+0x10e/0x280 kernel/trace/bpf_trace.c:876 #2: (rcu_read_lock){....}, at: [<000000009767f564>] bpf_prog_array_copy_to_user+0x0/0x4d0 kernel/bpf/core.c:1568 stack backtrace: CPU: 0 PID: 7677 Comm: syz-executor5 Not tainted 4.15.0+ #10 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:4532 _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:00007f6d4fd9dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000020106000 RSI: 00000000c008240a RDI: 0000000000000013 RBP: 000000000000027a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2c10 R13: 00000000ffffffff R14: 00007f6d4fd9e6d4 R15: 0000000000000000 BUG: sleeping function called from invalid context at lib/usercopy.c:25 in_atomic(): 1, irqs_disabled(): 0, pid: 7677, name: syz-executor5 3 locks held by syz-executor5/7677: #0: (&ctx->mutex){+.+.}, at: [<000000007b58e844>] perf_event_ctx_lock_nested+0x21b/0x450 kernel/events/core.c:1253 #1: (bpf_event_mutex){+.+.}, at: [<000000000e61e24f>] perf_event_query_prog_array+0x10e/0x280 kernel/trace/bpf_trace.c:876 #2: (rcu_read_lock){....}, at: [<000000009767f564>] bpf_prog_array_copy_to_user+0x0/0x4d0 kernel/bpf/core.c:1568 CPU: 0 PID: 7677 Comm: syz-executor5 Not tainted 4.15.0+ #10 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:4532 _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:00007f6d4fd9dc58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000071bea0 RCX: 0000000000453299 RDX: 0000000020106000 RSI: 00000000c008240a RDI: 0000000000000013 RBP: 000000000000027a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f2c10 R13: 00000000ffffffff R14: 00007f6d4fd9e6d4 R15: 0000000000000000 IPVS: ftp: loaded support on port[0] = 21 autofs4:pid:7794:autofs4_fill_super: called with bogus options autofs4:pid:7795:autofs4_fill_super: called with bogus options cgroup: cgroup2: unknown option "" cgroup: cgroup2: unknown option "" IPVS: ftp: loaded support on port[0] = 21 IPVS: ftp: loaded support on port[0] = 21 syz-executor6[8052] is installing a program with bpf_probe_write_user helper that may corrupt user memory! overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' syz-executor6[8052] is installing a program with bpf_probe_write_user helper that may corrupt user memory! EXT4-fs (sda1): re-mounted. Opts: overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' EXT4-fs (sda1): re-mounted. Opts: IPVS: ftp: loaded support on port[0] = 21 xprt_adjust_timeout: rq_timeout = 0! audit: type=1400 audit(1517569895.673:19): avc: denied { ioctl } for pid=8363 comm="syz-executor3" path="socket:[22218]" dev="sockfs" ino=22218 ioctlcmd=0x89e2 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=sock_file permissive=1 9pnet_virtio: no channels available for device ./file0