====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/14535 is trying to acquire lock: 00000000b42c8c20 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2750 [inline] 00000000b42c8c20 (&sig->cred_guard_mutex){+.+.}, at: proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 but task is already holding lock: 00000000e07b062c (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: cgroup: cgroup2: unknown option "memory_recursiveprot" seq_read+0x6b/0x11c0 fs/seq_file.c:164 proc_reg_read+0x1bd/0x2d0 fs/proc/inode.c:231 do_loop_readv_writev fs/read_write.c:701 [inline] do_loop_readv_writev fs/read_write.c:688 [inline] do_iter_read+0x471/0x630 fs/read_write.c:925 vfs_readv+0xe5/0x150 fs/read_write.c:987 kernel_readv fs/splice.c:362 [inline] default_file_splice_read+0x457/0xa00 fs/splice.c:417 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1502 [inline] __se_sys_sendfile64+0xc4/0x160 fs/read_write.c:1494 IPVS: ftp: loaded support on port[0] = 21 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_do_remove+0xf0/0xdb0 fs/overlayfs/dir.c:845 vfs_rmdir.part.0+0x10f/0x3d0 fs/namei.c:3882 vfs_rmdir fs/namei.c:3868 [inline] do_rmdir+0x3fd/0x490 fs/namei.c:3943 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: inode_lock_shared include/linux/fs.h:758 [inline] lookup_slow fs/namei.c:1688 [inline] walk_component+0x798/0xda0 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat+0x1ff/0x8d0 fs/namei.c:2319 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 create_local_trace_uprobe+0x82/0x490 kernel/trace/trace_uprobe.c:1356 perf_uprobe_init+0x128/0x200 kernel/trace/trace_event_perf.c:317 perf_uprobe_event_init+0xf8/0x190 kernel/events/core.c:8613 perf_try_init_event+0x124/0x2e0 kernel/events/core.c:9884 perf_init_event kernel/events/core.c:9915 [inline] perf_event_alloc.part.0+0x1b16/0x2eb0 kernel/events/core.c:10189 perf_event_alloc kernel/events/core.c:10559 [inline] __do_sys_perf_event_open kernel/events/core.c:10660 [inline] __se_sys_perf_event_open+0x550/0x2720 kernel/events/core.c:10549 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sig->cred_guard_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 cgroup: cgroup2: unknown option "memory_recursiveprot" vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#3); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 2 locks held by syz-executor.5/14535: #0: 0000000037d1272f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 00000000e07b062c (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 0 PID: 14535 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1222 check_prev_add kernel/locking/lockdep.c:1866 [inline] check_prevs_add kernel/locking/lockdep.c:1979 [inline] validate_chain kernel/locking/lockdep.c:2420 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3416 IPVS: ftp: loaded support on port[0] = 21 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 cgroup: cgroup2: unknown option "memory_recursiveprot" do_io_accounting fs/proc/base.c:2750 [inline] proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 __vfs_read+0xf7/0x750 fs/read_write.c:416 vfs_read+0x194/0x3c0 fs/read_write.c:452 ksys_read+0x12b/0x2a0 fs/read_write.c:579 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fa2814e20f9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa27fa54168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007fa281601f80 RCX: 00007fa2814e20f9 cgroup: cgroup2: unknown option "memory_recursiveprot" RDX: 0000000000002020 RSI: 0000000020000840 RDI: 0000000000000003 RBP: 00007fa28153dae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc7a87baaf R14: 00007fa27fa54300 R15: 0000000000022000 cgroup: cgroup2: unknown option "memory_recursiveprot" IPVS: ftp: loaded support on port[0] = 21 cgroup: cgroup2: unknown option "memory_recursiveprot" IPVS: ftp: loaded support on port[0] = 21 cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" netlink: 7820 bytes leftover after parsing attributes in process `syz-executor.0'. audit: type=1804 audit(1677432378.706:3103): pid=14822 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="file0" dev="sda1" ino=14124 res=1 cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" IPVS: ftp: loaded support on port[0] = 21 cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" IPVS: ftp: loaded support on port[0] = 21 cgroup: cgroup2: unknown option "memory_recursiveprot" cgroup: cgroup2: unknown option "memory_recursiveprot" IPVS: ftp: loaded support on port[0] = 21