====================================================== WARNING: possible circular locking dependency detected 4.19.146-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/4694 is trying to acquire lock: 00000000e510df13 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2738 [inline] 00000000e510df13 (&sig->cred_guard_mutex){+.+.}, at: proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2781 but task is already holding lock: 00000000e65342af (&p->lock){+.+.}, at: seq_read+0x6b/0x10c0 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: seq_read+0x6b/0x10c0 fs/seq_file.c:161 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+0x457/0xa10 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:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x670 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+0xf0/0xdd0 fs/overlayfs/dir.c:843 vfs_rmdir.part.0+0x161/0x430 fs/namei.c:3882 vfs_rmdir fs/namei.c:3865 [inline] do_rmdir+0x3af/0x420 fs/namei.c:3943 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]#2){++++}: inode_lock_shared include/linux/fs.h:758 [inline] do_last fs/namei.c:3326 [inline] path_openat+0x1863/0x2e90 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_open_execat+0x11d/0x5b0 fs/exec.c:853 __do_execve_file+0x1ad4/0x23c0 fs/exec.c:1757 do_execveat_common fs/exec.c:1866 [inline] do_execveat+0x3d/0x50 fs/exec.c:1894 __do_sys_execveat fs/exec.c:1975 [inline] __se_sys_execveat fs/exec.c:1967 [inline] __x64_sys_execveat+0xe1/0x120 fs/exec.c:1967 do_syscall_64+0xf9/0x670 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:925 [inline] __mutex_lock+0xd7/0x13f0 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2738 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2781 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4bc/0x10c0 fs/seq_file.c:229 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 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 do_syscall_64+0xf9/0x670 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 *** 1 lock held by syz-executor.2/4694: #0: 00000000e65342af (&p->lock){+.+.}, at: seq_read+0x6b/0x10c0 fs/seq_file.c:161 stack backtrace: CPU: 1 PID: 4694 Comm: syz-executor.2 Not tainted 4.19.146-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x22c/0x33e lib/dump_stack.c:118 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1865 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x37ad/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x13f0 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2738 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2781 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4bc/0x10c0 fs/seq_file.c:229 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 do_preadv fs/read_write.c:1071 [inline] __do_sys_preadv fs/read_write.c:1121 [inline] __se_sys_preadv fs/read_write.c:1116 [inline] __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45d5f9 Code: 5d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdc4f4f5c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000025900 RCX: 000000000045d5f9 RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000004 RBP: 000000000118cf90 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c R13: 00007ffda93fd33f R14: 00007fdc4f4f69c0 R15: 000000000118cf4c xt_nat: multiple ranges no longer supported f2fs_msg: 15 callbacks suppressed F2FS-fs (loop0): Invalid Fs Meta Ino: node(0) meta(0) root(0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock xt_nat: multiple ranges no longer supported F2FS-fs (loop0): invalid crc value xt_nat: multiple ranges no longer supported 9pnet: Insufficient options for proto=fd F2FS-fs (loop0): Mounted with checkpoint version = 79df1d6d 9pnet: Insufficient options for proto=fd xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported 9pnet: Insufficient options for proto=fd F2FS-fs (loop0): Invalid Fs Meta Ino: node(0) meta(0) root(0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop0): invalid crc value F2FS-fs (loop0): Mounted with checkpoint version = 79df1d6d xt_nat: multiple ranges no longer supported F2FS-fs (loop0): Invalid Fs Meta Ino: node(0) meta(0) root(0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd xt_nat_checkentry_v0: 7 callbacks suppressed xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported f2fs_msg: 22 callbacks suppressed F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop0): invalid crc value xt_nat: multiple ranges no longer supported xt_nat: multiple ranges no longer supported F2FS-fs (loop0): Mounted with checkpoint version = 79df1d6d xt_nat: multiple ranges no longer supported F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop0): invalid crc value F2FS-fs (loop0): Mounted with checkpoint version = 79df1d6d F2FS-fs (loop0): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop0): Can't find valid F2FS filesystem in 1th superblock xt_nat_checkentry_v0: 12 callbacks suppressed xt_nat: multiple ranges no longer supported