program: bpf$PROG_LOAD(0x5, &(0x7f00000004c0)={0xa, 0xc, 0x0, 0x0, 0xffffffff, 0x0, 0x0, 0x0, 0x2, '\x00', 0x0, @fallback=0x2b, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) syz_mount_image$erofs(&(0x7f0000000040), &(0x7f0000000080)='./file2\x00', 0x0, &(0x7f0000000000)=ANY=[], 0x1, 0x1db, &(0x7f0000000380)="$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") socket$packet(0x11, 0x3, 0x300) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f0000000080)=0x8) r0 = getpid() sched_setscheduler(r0, 0x2, &(0x7f0000000200)=0x7) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x2) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xb635773f06ebbeee, 0x8031, 0xffffffffffffffff, 0x6770c000) socketpair$unix(0x1, 0x2, 0x0, &(0x7f0000000200)={0xffffffffffffffff, 0xffffffffffffffff}) connect$unix(r1, &(0x7f000057eff8)=@abs, 0x6e) sendmmsg$unix(r2, &(0x7f0000000000), 0x651, 0x0) recvmmsg(r1, &(0x7f00000000c0), 0x10106, 0x2, 0x0) bpf$PROG_LOAD(0x5, &(0x7f0000000c40)={0x6, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB="180000000000000000000000fdffffde18000000", @ANYRES32, @ANYBLOB="0000000000000000b7080000000000007b8af8ff00000000bfa200000000000007020000f8ffffffb703000008000000b704000000000000850000004300000095"], 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, @fallback=0x2d, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) r3 = bpf$PROG_LOAD(0x5, &(0x7f00000000c0)={0x1f, 0xc, &(0x7f0000000440)=ANY=[], &(0x7f0000000240)='GPL\x00', 0x0, 0x0, 0x0, 0x0, 0x1a, '\x00', 0x0, @fallback, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x90) bpf$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r3}, 0xc) bpf$MAP_LOOKUP_ELEM(0x1, &(0x7f00000002c0)={0xffffffffffffffff, &(0x7f0000000240), 0x0}, 0x20) r4 = ioctl$KVM_CREATE_VM(0xffffffffffffffff, 0xae01, 0x0) r5 = ioctl$KVM_CREATE_VCPU(r4, 0xae41, 0x1) syz_kvm_setup_cpu$x86(0xffffffffffffffff, r5, &(0x7f0000016000/0x18000)=nil, 0x0, 0x0, 0x4e, 0x0, 0x0) getsockopt$XDP_STATISTICS(0xffffffffffffffff, 0x11b, 0x7, 0x0, &(0x7f0000000200)) r6 = syz_genetlink_get_family_id$tipc(&(0x7f0000000080), 0xffffffffffffffff) sendmsg$TIPC_CMD_SHOW_LINK_STATS(0xffffffffffffffff, &(0x7f00000001c0)={&(0x7f0000000040)={0x10, 0x0, 0x0, 0x20800}, 0xc, &(0x7f0000000100)={&(0x7f00000000c0)={0x28, r6, 0x100, 0x70bd28, 0x25dfdbfe, {{}, {}, {0xc, 0x14, 'syz0\x00'}}, ["", "", "", "", "", ""]}, 0x28}}, 0x40000) [ 86.645992][ T5294] Bluetooth: hci0: command tx timeout [ 86.833609][ T5315] loop0: detected capacity change from 0 to 16 [ 86.902831][ T5315] erofs (device loop0): mounted with root inode @ nid 36. [ 87.242730][ T5325] [ 87.244021][ T5325] ============================= [ 87.246172][ T5325] WARNING: suspicious RCU usage [ 87.248638][ T5325] syzkaller #0 Not tainted [ 87.250696][ T5325] ----------------------------- [ 87.252782][ T5325] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 87.256337][ T5325] [ 87.256337][ T5325] other info that might help us debug this: [ 87.256337][ T5325] [ 87.260960][ T5325] [ 87.260960][ T5325] rcu_scheduler_active = 2, debug_locks = 1 [ 87.264341][ T5325] 1 lock held by syz.0.0/5325: [ 87.266609][ T5325] #0: ffffffff8e7604d8 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 87.271730][ T5325] [ 87.271730][ T5325] stack backtrace: [ 87.274391][ T5325] CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 87.274406][ T5325] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 87.274413][ T5325] Call Trace: [ 87.274421][ T5325] [ 87.274447][ T5325] dump_stack_lvl+0xe8/0x150 [ 87.274496][ T5325] lockdep_rcu_suspicious+0x13f/0x1d0 [ 87.274533][ T5325] get_callchain_entry+0x2b6/0x3c0 [ 87.274564][ T5325] get_perf_callchain+0xd5/0x880 [ 87.274582][ T5325] ? __pfx_get_perf_callchain+0x10/0x10 [ 87.274614][ T5325] ? futex_unqueue+0x22/0x240 [ 87.274626][ T5325] ? futex_unqueue+0x22/0x240 [ 87.274635][ T5325] ? futex_unqueue+0x22/0x240 [ 87.274649][ T5325] __bpf_get_stack+0x445/0xab0 [ 87.274667][ T5325] ? __pfx___bpf_get_stack+0x10/0x10 [ 87.274685][ T5325] bpf_get_stack+0x33/0x50 [ 87.274703][ T5325] ? bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 87.274715][ T5325] bpf_get_stack_raw_tp+0x1a9/0x220 [ 87.274734][ T5325] bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 87.274747][ T5325] bpf_prog_run_pin_on_cpu+0x142/0x470 [ 87.274765][ T5325] bpf_prog_test_run_syscall+0x318/0x4c0 [ 87.274780][ T5325] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 87.274792][ T5325] ? __fget_files+0x2a/0x420 [ 87.274824][ T5325] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 87.274838][ T5325] bpf_prog_test_run+0x2c7/0x340 [ 87.274852][ T5325] __sys_bpf+0x643/0x950 [ 87.274869][ T5325] ? __pfx___sys_bpf+0x10/0x10 [ 87.274899][ T5325] ? rcu_is_watching+0x15/0xb0 [ 87.274920][ T5325] __x64_sys_bpf+0x7c/0x90 [ 87.274935][ T5325] do_syscall_64+0x14d/0xf80 [ 87.275076][ T5325] ? trace_irq_disable+0x3b/0x150 [ 87.275092][ T5325] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.275106][ T5325] ? clear_bhb_loop+0x40/0x90 [ 87.275122][ T5325] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 87.275134][ T5325] RIP: 0033:0x7fd482d9c629 [ 87.275163][ T5325] Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 [ 87.275174][ T5325] RSP: 002b:00007fd483c94028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 87.275203][ T5325] RAX: ffffffffffffffda RBX: 00007fd483016180 RCX: 00007fd482d9c629 [ 87.275212][ T5325] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 87.275220][ T5325] RBP: 00007fd482e32b39 R08: 0000000000000000 R09: 0000000000000000 [ 87.275228][ T5325] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 87.275234][ T5325] R13: 00007fd483016218 R14: 00007fd483016180 R15: 00007ffc5b0a4948 [ 87.275255][ T5325]