program: bpf$PROG_LOAD(0x5, &(0x7f00000004c0)={0xa, 0xc, &(0x7f0000000440)=ANY=[@ANYBLOB, @ANYRES32], 0x0, 0xffffffff, 0x0, 0x0, 0x0, 0x2, '\x00', 0x0, @fallback=0x2b, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, 0x94) syz_mount_image$erofs(&(0x7f0000000040), &(0x7f0000000080)='./file2\x00', 0x0, &(0x7f0000000000)=ANY=[], 0x1, 0x1db, &(0x7f0000000380)="$eJzslb+qE0EUxr+ZjbuJiA9gY2HAa+Fmd6Nic+Ha2GghRI0WgsFsQnRjJNnCBER8AjsLOwsfQ4itDyFR8A+INmo9Mn92M4ZESMyawvODnHyzM3vmzBn4FgRB/Le8f/dzJn7sfyoDOIIqPPP8swPgQGturX9b/vbo9eWLzae3Xr7xZn7l92ze2vuXAEwvOEjNWAgh7Pmq+b8Kjio+Kn0NHKfM8yYYfKNvg+O60TEYbhp919IDud73O70k9u8MkrYUgQyhDJEM9cX6vj5haFv1MWt+NJ7cayVJPCxQLO/c9EteXxnYt+qz78uHrjZQ/dOE4AiNroOhYfR5eFlvdEus8x8rzfM7fzy/i7889gcA8yedIjvryq02eh1g/+TuCxYOlMhudOf1bF2gtLWEwgM2fr1x49ml4k76yjh1XupjPV4vz8GKKXfNPKbzuX+KFwwnLX/SVvJcfSxqaf9BbTSenO71W924G9+Povq54EwQnI1qyoh0XG6BKn9F+dPho3n+yqq1LnPxsJWmw1DHfBzpuMxxufI/jr0TOCTH0k3dhbzfAWSbMvPj6l+qPWdl8QRBEDvkOJjyZOXLmTBfk3xCiOjKjuskCIIgCIIgCIIgCGJzfgUAAP//K0NgKg==") socket$packet(0x11, 0x3, 0x300) bpf$MAP_CREATE(0x0, &(0x7f0000000300)=ANY=[@ANYBLOB="0a0000000b000000020000000600000042000000", @ANYRES32, @ANYBLOB="0000000100"/20, @ANYRES32=0x0, @ANYRES32], 0x50) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x8, 0x8b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f0000000080)=0x8) r0 = getpid() sched_setscheduler(r0, 0x2, &(0x7f0000000200)=0x7) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x2) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0xb635773f06ebbeee, 0x8031, 0xffffffffffffffff, 0x6770c000) socketpair$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$PROG_BIND_MAP(0xa, &(0x7f00000004c0)={r3}, 0xc) sched_setaffinity(0x0, 0x8, &(0x7f0000000240)=0x6) bpf$MAP_LOOKUP_ELEM(0x1, &(0x7f00000002c0)={0xffffffffffffffff, &(0x7f0000000240), 0x0}, 0x20) [ 152.335270][ T45] Bluetooth: hci0: command tx timeout [ 152.424509][ T5331] loop0: detected capacity change from 0 to 16 [ 152.445176][ T5331] erofs (device loop0): mounted with root inode @ nid 36. [ 152.769885][ T5333] [ 152.771085][ T5333] ============================= [ 152.773216][ T5333] WARNING: suspicious RCU usage [ 152.775448][ T5333] syzkaller #0 Not tainted [ 152.777432][ T5333] ----------------------------- [ 152.779661][ T5333] kernel/events/callchain.c:163 suspicious rcu_dereference_check() usage! [ 152.783117][ T5333] [ 152.783117][ T5333] other info that might help us debug this: [ 152.783117][ T5333] [ 152.787289][ T5333] [ 152.787289][ T5333] rcu_scheduler_active = 2, debug_locks = 1 [ 152.790534][ T5333] 1 lock held by syz.0.0/5333: [ 152.792662][ T5333] #0: ffffffff8e7604d8 (rcu_tasks_trace_srcu_struct){....}-{0:0}, at: rcu_read_lock_trace+0x25/0x110 [ 152.797699][ T5333] [ 152.797699][ T5333] stack backtrace: [ 152.800323][ T5333] CPU: 0 UID: 0 PID: 5333 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 152.800342][ T5333] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 152.800350][ T5333] Call Trace: [ 152.800359][ T5333] [ 152.800380][ T5333] dump_stack_lvl+0xe8/0x150 [ 152.800401][ T5333] lockdep_rcu_suspicious+0x13f/0x1d0 [ 152.800422][ T5333] get_callchain_entry+0x2b6/0x3c0 [ 152.800441][ T5333] get_perf_callchain+0xd5/0x880 [ 152.800462][ T5333] ? __pfx_get_perf_callchain+0x10/0x10 [ 152.800477][ T5333] ? futex_unqueue+0x22/0x240 [ 152.800499][ T5333] ? futex_unqueue+0x22/0x240 [ 152.800510][ T5333] ? futex_unqueue+0x22/0x240 [ 152.800526][ T5333] __bpf_get_stack+0x445/0xab0 [ 152.800544][ T5333] ? __pfx___bpf_get_stack+0x10/0x10 [ 152.800564][ T5333] bpf_get_stack+0x33/0x50 [ 152.800583][ T5333] ? bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 152.800596][ T5333] bpf_get_stack_raw_tp+0x1a9/0x220 [ 152.800618][ T5333] bpf_prog_42db8cfdf50901c9+0x46/0x4e [ 152.800628][ T5333] bpf_prog_run_pin_on_cpu+0x142/0x470 [ 152.800647][ T5333] bpf_prog_test_run_syscall+0x318/0x4c0 [ 152.800663][ T5333] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 152.800676][ T5333] ? __fget_files+0x2a/0x420 [ 152.800696][ T5333] ? __pfx_bpf_prog_test_run_syscall+0x10/0x10 [ 152.800710][ T5333] bpf_prog_test_run+0x2c7/0x340 [ 152.800725][ T5333] __sys_bpf+0x643/0x950 [ 152.800743][ T5333] ? __pfx___sys_bpf+0x10/0x10 [ 152.800774][ T5333] ? rcu_is_watching+0x15/0xb0 [ 152.800795][ T5333] __x64_sys_bpf+0x7c/0x90 [ 152.800811][ T5333] do_syscall_64+0x14d/0xf80 [ 152.801058][ T5333] ? trace_irq_disable+0x3b/0x150 [ 152.801074][ T5333] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 152.801086][ T5333] ? clear_bhb_loop+0x40/0x90 [ 152.801099][ T5333] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 152.801111][ T5333] RIP: 0033:0x7f227359c629 [ 152.801124][ T5333] 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 [ 152.801132][ T5333] RSP: 002b:00007f22744b3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 [ 152.801146][ T5333] RAX: ffffffffffffffda RBX: 00007f2273816180 RCX: 00007f227359c629 [ 152.801154][ T5333] RDX: 000000000000000c RSI: 00002000000004c0 RDI: 000000000000000a [ 152.801160][ T5333] RBP: 00007f2273632b39 R08: 0000000000000000 R09: 0000000000000000 [ 152.801172][ T5333] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 152.801179][ T5333] R13: 00007f2273816218 R14: 00007f2273816180 R15: 00007fff708e80b8 [ 152.801199][ T5333]