program: r0 = openat$ptmx(0xffffffffffffff9c, &(0x7f0000002240), 0x80040, 0x0) ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000080)=0xd) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x88}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000240)=0x7) r1 = getpid() sched_setscheduler(r1, 0x2, &(0x7f0000000200)=0x7) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xb635773f06ebbeee, 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$BPF_GET_PROG_INFO(0xa, &(0x7f0000000740)={r5, 0x0, 0x0}, 0x10) socketpair$unix(0x1, 0x3, 0x0, &(0x7f0000000080)={0xffffffffffffffff}) recvmmsg(r6, 0x0, 0x0, 0x2, 0x0) sendmsg$RDMA_NLDEV_CMD_NEWLINK(0xffffffffffffffff, 0x0, 0x20000000) syz_open_procfs(0x0, 0x0) syz_open_dev$loop(0x0, 0xfffffffffffff3b4, 0x800) r7 = openat$ocfs2_control(0xffffffffffffff9c, &(0x7f00000190c0), 0x208040, 0x0) ioctl$F2FS_IOC_RELEASE_VOLATILE_WRITE(r7, 0xf504, 0x0) [ 68.738539][ T4670] Bluetooth: hci0: command tx timeout [ 69.035963][ T5323] [ 69.037093][ T5323] ============================= [ 69.039224][ T5323] WARNING: suspicious RCU usage [ 69.041246][ T5323] syzkaller #0 Not tainted [ 69.042910][ T5323] ----------------------------- [ 69.044814][ T5323] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 69.048026][ T5323] [ 69.048026][ T5323] other info that might help us debug this: [ 69.048026][ T5323] [ 69.052389][ T5323] [ 69.052389][ T5323] rcu_scheduler_active = 2, debug_locks = 1 [ 69.056132][ T5323] 1 lock held by syz.0.0/5323: [ 69.058347][ T5323] #0: ffffffff8df3d4c0 (rcu_read_lock_trace){....}-{0:0}, at: rcu_read_lock_trace+0x38/0x80 [ 69.063068][ T5323] [ 69.063068][ T5323] stack backtrace: [ 69.065663][ T5323] CPU: 0 UID: 0 PID: 5323 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 69.065678][ T5323] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 [ 69.065686][ T5323] Call Trace: [ 69.065693][ T5323] [ 69.065698][ T5323] dump_stack_lvl+0x189/0x250 [ 69.065722][ T5323] ? __pfx_dump_stack_lvl+0x10/0x10 [ 69.065739][ T5323] ? __pfx__printk+0x10/0x10 [ 69.065758][ T5323] lockdep_rcu_suspicious+0x140/0x1d0 [ 69.065781][ T5323] get_callchain_entry+0x2b6/0x3c0 [ 69.065799][ T5323] get_perf_callchain+0xb3/0x6f0 [ 69.065812][ T5323] ? __pfx___schedule+0x10/0x10 [ 69.065826][ T5323] ? __pfx_get_perf_callchain+0x10/0x10 [ 69.065849][ T5323] __bpf_get_stack+0x3fa/0xa60 [ 69.065866][ T5323] ? __pfx___bpf_get_stack+0x10/0x10 [ 69.065883][ T5323] bpf_get_stack+0x33/0x50 [ 69.065897][ T5323] ? bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 69.065906][ T5323] bpf_get_stack_raw_tp+0x1a9/0x220 [ 69.065924][ T5323] bpf_prog_aa1f08ea8b241262+0x46/0x4e [ 69.065934][ T5323] bpf_prog_run_pin_on_cpu+0x143/0x470 [ 69.065954][ T5323] bpf_prog_test_run_syscall+0x312/0x4b0 [ 69.065971][ T5323] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 69.065986][ T5323] ? __fget_files+0x2a/0x420 [ 69.066003][ T5323] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 69.066018][ T5323] bpf_prog_test_run+0x2c7/0x340 [ 69.066032][ T5323] __sys_bpf+0x562/0x860 [ 69.066043][ T5323] ? __pfx___sys_bpf+0x10/0x10 [ 69.066052][ T5323] ? rcu_is_watching+0x15/0xb0 [ 69.066077][ T5323] ? rcu_is_watching+0x15/0xb0 [ 69.066094][ T5323] __x64_sys_bpf+0x7c/0x90 [ 69.066110][ T5323] do_syscall_64+0xfa/0xfa0 [ 69.066122][ T5323] ? lockdep_hardirqs_on+0x9c/0x150 [ 69.066135][ T5323] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 69.066145][ T5323] ? clear_bhb_loop+0x60/0xb0 [ 69.066158][ T5323] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 69.066169][ T5323] RIP: 0033:0x7f506b38efc9 [ 69.066182][ T5323] 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 [ 69.066190][ T5323] RSP: 002b:00007f506c286038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 69.066204][ T5323] RAX: ffffffffffffffda RBX: 00007f506b5e6180 RCX: 00007f506b38efc9 [ 69.066212][ T5323] RDX: 0000000000000010 RSI: 0000200000000740 RDI: 000000000000000a [ 69.066218][ T5323] RBP: 00007f506b411f91 R08: 0000000000000000 R09: 0000000000000000 [ 69.066223][ T5323] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 69.066229][ T5323] R13: 00007f506b5e6218 R14: 00007f506b5e6180 R15: 00007ffcdb8909e8 [ 69.066246][ T5323]