program: mkdirat(0xffffffffffffff9c, &(0x7f0000000040)='./cgroup.cpu/test\x00', 0x777) r0 = openat(0xffffffffffffff9c, &(0x7f0000000140)='./cgroup.cpu/test/memory.limit_in_bytes\x00', 0x2, 0x0) write(r0, &(0x7f0000000380)='10000', 0x5) r1 = openat(0xffffffffffffff9c, &(0x7f00000001c0)='./cgroup.cpu/test/memory.oom_control\x00', 0x2, 0x0) write(r1, &(0x7f0000000200)='1', 0x1) r2 = openat(0xffffffffffffff9c, &(0x7f0000000240)='./cgroup.cpu/test/cgroup.procs\x00', 0x2, 0x0) write(r2, &(0x7f0000000280)='0', 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000000)='./tracing\x00', 0x17f) mount(0x0, &(0x7f00000002c0)='./tracing\x00', &(0x7f00000000c0)='tracefs\x00', 0x0, 0x0) bpf$MAP_CREATE_CONST_STR(0x0, &(0x7f0000002380)=ANY=[@ANYBLOB="020000000400feff4e489146889241dd80000000", @ANYRES32=0x0, @ANYBLOB='\x00'/20, @ANYRES32=0x0, @ANYRES32=0x0, @ANYBLOB='\x00'/28], 0x50) syz_open_dev$video(&(0x7f0000000000), 0x485, 0x40000) socket$inet_tcp(0x2, 0x1, 0x0) socket$inet_tcp(0x2, 0x1, 0x0) r3 = openat$nullb(0xffffffffffffff9c, 0x0, 0x400000000a882, 0x0) r4 = dup(r3) openat2(0xffffffffffffffff, 0x0, 0x0, 0x0) mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x3000002, 0x28011, r4, 0x0) ioctl$TIOCGSID(r2, 0x5429, &(0x7f0000000080)=0x0) ptrace$peek(0x2, r5, &(0x7f0000000180)) madvise(&(0x7f0000000000/0xc00000)=nil, 0xc00000, 0x1) mkdirat(0xffffffffffffff9c, &(0x7f0000000100)='./tracing/instances/inst1\x00', 0x1ff) [ 101.336408][ T5316] oom_control is deprecated and will be removed. Please report your usecase to linux-mm-@kvack.org if you depend on this functionality. [ 101.462616][ T5316] Could not create tracefs 'show_event_triggers' entry [ 101.477199][ T5316] Could not create tracefs 'set_event_pid' entry [ 101.491219][ T5316] Could not create tracefs 'set_event_notrace_pid' entry [ 101.505326][ T5316] ------------[ cut here ]------------ [ 101.508432][ T5316] !list_empty(&ei->children) [ 101.508445][ T5316] WARNING: fs/tracefs/event_inode.c:128 at free_ei+0x284/0x340, CPU#0: syz.0.0/5316 [ 101.515131][ T5316] Modules linked in: [ 101.517707][ T5316] CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 101.521631][ T5316] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 101.525995][ T5316] RIP: 0010:free_ei+0x284/0x340 [ 101.528121][ T5316] Code: 48 c7 c7 80 e3 11 8f 48 89 de 48 c7 c2 10 7b da 83 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 32 dd d0 fd e8 5d 93 ec fd 90 <0f> 0b 90 e9 c7 fd ff ff e8 4f 93 ec fd 90 0f 0b 90 48 b8 00 00 00 [ 101.536988][ T5316] RSP: 0018:ffffc9000f28fa88 EFLAGS: 00010287 [ 101.539790][ T5316] RAX: ffffffff83da7ea3 RBX: ffff88801fbfe090 RCX: 0000000000100000 [ 101.543092][ T5316] RDX: ffffc9000e8d2000 RSI: 0000000000084dd3 RDI: 0000000000084dd4 [ 101.546396][ T5316] RBP: ffff88801fbfe080 R08: 00000000ffffffff R09: 1ffffffff20af686 [ 101.549712][ T5316] R10: dffffc0000000000 R11: fffffbfff20af687 R12: 0000000000000000 [ 101.553304][ T5316] R13: ffff88801fad7000 R14: ffff88801fbfe080 R15: 0000000000000003 [ 101.556675][ T5316] FS: 00007f90978276c0(0000) GS:ffff88808c53e000(0000) knlGS:0000000000000000 [ 101.560409][ T5316] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 101.563357][ T5316] CR2: 00007f9097830230 CR3: 0000000012b7c000 CR4: 0000000000352ef0 [ 101.566889][ T5316] Call Trace: [ 101.568417][ T5316] [ 101.569712][ T5316] ? new_inode+0x13a/0x170 [ 101.571652][ T5316] ? tracefs_get_inode+0x11/0x80 [ 101.573623][ T5316] eventfs_create_events_dir+0x7c4/0x9f0 [ 101.576025][ T5316] create_event_toplevel_files+0x11e/0x1a0 [ 101.578580][ T5316] event_trace_add_tracer+0x8a/0x3b0 [ 101.580815][ T5316] trace_array_create_dir+0x77/0x160 [ 101.583100][ T5316] trace_array_create_systems+0xb3c/0xe60 [ 101.585339][ T5316] instance_mkdir+0xd5/0x140 [ 101.587172][ T5316] tracefs_syscall_mkdir+0x11a/0x190 [ 101.589383][ T5316] ? __pfx_tracefs_syscall_mkdir+0x10/0x10 [ 101.591962][ T5316] ? generic_permission+0x2bf/0x670 [ 101.594181][ T5316] ? bpf_lsm_inode_mkdir+0x9/0x20 [ 101.596338][ T5316] vfs_mkdir+0x406/0x620 [ 101.598146][ T5316] filename_mkdirat+0x285/0x510 [ 101.600250][ T5316] ? __pfx_filename_mkdirat+0x10/0x10 [ 101.602419][ T5316] ? do_getname+0x151/0x250 [ 101.604276][ T5316] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.606959][ T5316] __se_sys_mkdirat+0x35/0x150 [ 101.609065][ T5316] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.611511][ T5316] do_syscall_64+0x174/0x580 [ 101.614978][ T5316] ? trace_irq_disable+0x3b/0x140 [ 101.617107][ T5316] ? clear_bhb_loop+0x70/0xc0 [ 101.619324][ T5316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.622136][ T5316] RIP: 0033:0x7f909699e0d9 [ 101.624298][ T5316] 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 [ 101.633482][ T5316] RSP: 002b:00007f9097826fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 101.637314][ T5316] RAX: ffffffffffffffda RBX: 00007f9096c25fa0 RCX: 00007f909699e0d9 [ 101.640540][ T5316] RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c [ 101.644459][ T5316] RBP: 00007f9096a35024 R08: 0000000000000000 R09: 0000000000000000 [ 101.648213][ T5316] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 101.651594][ T5316] R13: 00007f9096c26038 R14: 00007f9096c25fa0 R15: 00007fff15a910c8 [ 101.654877][ T5316] [ 101.656125][ T5316] Kernel panic - not syncing: kernel: panic_on_warn set ... [ 101.659194][ T5316] CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) [ 101.662705][ T5316] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 101.666858][ T5316] Call Trace: [ 101.668199][ T5316] [ 101.669487][ T5316] vpanic+0x56c/0xa60 [ 101.671102][ T5316] ? __pfx__printk+0x10/0x10 [ 101.673161][ T5316] ? __pfx_vpanic+0x10/0x10 [ 101.675156][ T5316] ? is_bpf_text_address+0x292/0x2b0 [ 101.677414][ T5316] ? is_bpf_text_address+0x26/0x2b0 [ 101.679778][ T5316] panic+0xc5/0xd0 [ 101.681482][ T5316] ? __pfx_panic+0x10/0x10 [ 101.683486][ T5316] __warn+0x315/0x4c0 [ 101.685202][ T5316] ? free_ei+0x284/0x340 [ 101.687011][ T5316] ? free_ei+0x284/0x340 [ 101.688702][ T5316] __report_bug+0x276/0x570 [ 101.690687][ T5316] ? free_ei+0x284/0x340 [ 101.692526][ T5316] ? __pfx___report_bug+0x10/0x10 [ 101.694702][ T5316] ? kasan_quarantine_put+0xbb/0x1f0 [ 101.696995][ T5316] ? free_ei+0x284/0x340 [ 101.698848][ T5316] report_bug+0x16a/0x220 [ 101.700788][ T5316] ? free_ei+0x284/0x340 [ 101.702560][ T5316] ? free_ei+0x286/0x340 [ 101.704395][ T5316] handle_bug+0x9c/0x200 [ 101.706231][ T5316] exc_invalid_op+0x1a/0x50 [ 101.708207][ T5316] asm_exc_invalid_op+0x1a/0x20 [ 101.710310][ T5316] RIP: 0010:free_ei+0x284/0x340 [ 101.712403][ T5316] Code: 48 c7 c7 80 e3 11 8f 48 89 de 48 c7 c2 10 7b da 83 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 32 dd d0 fd e8 5d 93 ec fd 90 <0f> 0b 90 e9 c7 fd ff ff e8 4f 93 ec fd 90 0f 0b 90 48 b8 00 00 00 [ 101.720274][ T5316] RSP: 0018:ffffc9000f28fa88 EFLAGS: 00010287 [ 101.722691][ T5316] RAX: ffffffff83da7ea3 RBX: ffff88801fbfe090 RCX: 0000000000100000 [ 101.725820][ T5316] RDX: ffffc9000e8d2000 RSI: 0000000000084dd3 RDI: 0000000000084dd4 [ 101.728956][ T5316] RBP: ffff88801fbfe080 R08: 00000000ffffffff R09: 1ffffffff20af686 [ 101.732226][ T5316] R10: dffffc0000000000 R11: fffffbfff20af687 R12: 0000000000000000 [ 101.735572][ T5316] R13: ffff88801fad7000 R14: ffff88801fbfe080 R15: 0000000000000003 [ 101.738943][ T5316] ? free_ei+0x283/0x340 [ 101.740755][ T5316] ? free_ei+0x283/0x340 [ 101.742341][ T5316] ? new_inode+0x13a/0x170 [ 101.744142][ T5316] ? tracefs_get_inode+0x11/0x80 [ 101.746107][ T5316] eventfs_create_events_dir+0x7c4/0x9f0 [ 101.748392][ T5316] create_event_toplevel_files+0x11e/0x1a0 [ 101.750803][ T5316] event_trace_add_tracer+0x8a/0x3b0 [ 101.753012][ T5316] trace_array_create_dir+0x77/0x160 [ 101.755218][ T5316] trace_array_create_systems+0xb3c/0xe60 [ 101.757488][ T5316] instance_mkdir+0xd5/0x140 [ 101.759318][ T5316] tracefs_syscall_mkdir+0x11a/0x190 [ 101.761468][ T5316] ? __pfx_tracefs_syscall_mkdir+0x10/0x10 [ 101.763675][ T5316] ? generic_permission+0x2bf/0x670 [ 101.765560][ T5316] ? bpf_lsm_inode_mkdir+0x9/0x20 [ 101.767456][ T5316] vfs_mkdir+0x406/0x620 [ 101.769079][ T5316] filename_mkdirat+0x285/0x510 [ 101.770852][ T5316] ? __pfx_filename_mkdirat+0x10/0x10 [ 101.772832][ T5316] ? do_getname+0x151/0x250 [ 101.774546][ T5316] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.776981][ T5316] __se_sys_mkdirat+0x35/0x150 [ 101.778873][ T5316] ? entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.781409][ T5316] do_syscall_64+0x174/0x580 [ 101.783241][ T5316] ? trace_irq_disable+0x3b/0x140 [ 101.785259][ T5316] ? clear_bhb_loop+0x70/0xc0 [ 101.787011][ T5316] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 101.789257][ T5316] RIP: 0033:0x7f909699e0d9 [ 101.791113][ T5316] 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 [ 101.798889][ T5316] RSP: 002b:00007f9097826fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 [ 101.802387][ T5316] RAX: ffffffffffffffda RBX: 00007f9096c25fa0 RCX: 00007f909699e0d9 [ 101.805643][ T5316] RDX: 00000000000001ff RSI: 0000200000000100 RDI: ffffffffffffff9c [ 101.808975][ T5316] RBP: 00007f9096a35024 R08: 0000000000000000 R09: 0000000000000000 [ 101.812192][ T5316] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [ 101.815665][ T5316] R13: 00007f9096c26038 R14: 00007f9096c25fa0 R15: 00007fff15a910c8 [ 101.819021][ T5316] [ 101.820793][ T5316] Kernel Offset: disabled [ 101.822703][ T5316] Rebooting in 86400 seconds..