program: r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000002240), 0x80040, 0x0) ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000080)=0xd) openat(0xffffffffffffff9c, 0x0, 0x0, 0x72) sched_setscheduler(0x0, 0x1, &(0x7f0000000240)=0x7) r1 = getpid() sched_setscheduler(r1, 0x2, &(0x7f0000000200)=0x7) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xb635773f06ebbee6, 0x8031, 0xffffffffffffffff, 0x0) socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0xffffffffffffffff, 0xffffffffffffffff}) connect$unix(r2, &(0x7f000057eff8)=@abs, 0x6e) sendmmsg$unix(r3, &(0x7f0000000000), 0x40001e0, 0x0) recvmmsg(r2, &(0x7f00000000c0), 0x10106, 0x2, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f0000000000)=0x6) r4 = bpf$MAP_CREATE(0x0, &(0x7f00000000c0)=@base={0x1b, 0x0, 0x0, 0x8000}, 0x48) bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x10, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="1800000000000000000000000000000018120000", @ANYRES32=r4, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b7040000f6000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r5 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x12, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x90) bpf$BPF_GET_PROG_INFO(0xa, &(0x7f0000000740)={r5, 0x0, 0x0}, 0x10) [ 76.772802][ T5336] Bluetooth: hci0: command tx timeout [ 76.776635][ T1314] ieee802154 phy0 wpan0: encryption failed: -22 [ 76.779159][ T1314] ieee802154 phy1 wpan1: encryption failed: -22 [ 77.075621][ T5359] [ 77.076870][ T5359] ============================= [ 77.079115][ T5359] WARNING: suspicious RCU usage [ 77.081825][ T5359] syzkaller #0 Not tainted [ 77.084025][ T5359] ----------------------------- [ 77.086345][ T5359] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 77.090015][ T5359] [ 77.090015][ T5359] other info that might help us debug this: [ 77.090015][ T5359] [ 77.094776][ T5359] [ 77.094776][ T5359] rcu_scheduler_active = 2, debug_locks = 1 [ 77.098482][ T5359] 1 lock held by syz.0.0/5359: [ 77.101368][ T5359] #0: ffffffff8e33a2c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 77.106931][ T5359] [ 77.106931][ T5359] stack backtrace: [ 77.110197][ T5359] CPU: 0 UID: 0 PID: 5359 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 77.110225][ T5359] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 77.110236][ T5359] Call Trace: [ 77.110245][ T5359] [ 77.110253][ T5359] dump_stack_lvl+0x189/0x250 [ 77.110280][ T5359] ? __pfx_dump_stack_lvl+0x10/0x10 [ 77.110297][ T5359] ? __pfx__printk+0x10/0x10 [ 77.110323][ T5359] lockdep_rcu_suspicious+0x140/0x1d0 [ 77.110398][ T5359] get_callchain_entry+0x2b6/0x3c0 [ 77.110420][ T5359] get_perf_callchain+0xa1/0x6b0 [ 77.110436][ T5359] ? rcu_read_lock_sched_held+0x89/0x100 [ 77.110453][ T5359] ? __pfx_get_perf_callchain+0x10/0x10 [ 77.110474][ T5359] ? preempt_schedule+0xae/0xc0 [ 77.110545][ T5359] __bpf_get_stack+0x3fc/0xa60 [ 77.110566][ T5359] ? __pfx___bpf_get_stack+0x10/0x10 [ 77.110579][ T5359] ? __lock_acquire+0xab9/0xd20 [ 77.110604][ T5359] bpf_get_stack+0x33/0x50 [ 77.110617][ T5359] ? bpf_prog_d43750871481577d+0x46/0x4e [ 77.110628][ T5359] bpf_get_stack_raw_tp+0x1a9/0x220 [ 77.110649][ T5359] bpf_prog_d43750871481577d+0x46/0x4e [ 77.110660][ T5359] bpf_prog_run_pin_on_cpu+0x6a/0x150 [ 77.110693][ T5359] bpf_prog_test_run_syscall+0x312/0x4b0 [ 77.110708][ T5359] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 77.110719][ T5359] ? __fget_files+0x2a/0x420 [ 77.110735][ T5359] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 77.110746][ T5359] bpf_prog_test_run+0x2c7/0x340 [ 77.110764][ T5359] __sys_bpf+0x581/0x870 [ 77.110781][ T5359] ? __pfx___sys_bpf+0x10/0x10 [ 77.110795][ T5359] ? rcu_is_watching+0x15/0xb0 [ 77.110819][ T5359] ? rcu_is_watching+0x15/0xb0 [ 77.110835][ T5359] __x64_sys_bpf+0x7c/0x90 [ 77.110851][ T5359] do_syscall_64+0xfa/0x3b0 [ 77.110864][ T5359] ? lockdep_hardirqs_on+0x9c/0x150 [ 77.110884][ T5359] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.110896][ T5359] ? clear_bhb_loop+0x60/0xb0 [ 77.110910][ T5359] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 77.110919][ T5359] RIP: 0033:0x7fc2af18eba9 [ 77.110930][ T5359] Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 [ 77.110941][ T5359] RSP: 002b:00007fc2b00e4038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 77.110957][ T5359] RAX: ffffffffffffffda RBX: 00007fc2af3d5fa0 RCX: 00007fc2af18eba9 [ 77.110965][ T5359] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 77.110972][ T5359] RBP: 00007fc2af211e19 R08: 0000000000000000 R09: 0000000000000000 [ 77.110979][ T5359] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 77.110988][ T5359] R13: 00007fc2af3d6038 R14: 00007fc2af3d5fa0 R15: 00007ffe3c858f78 [ 77.111006][ T5359]