syz-executor.4 (11547): drop_caches: 1 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/11692 is trying to acquire lock: 000000004e9bb6ec (&ovl_i_mutex_key[depth]#2){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] 000000004e9bb6ec (&ovl_i_mutex_key[depth]#2){+.+.}, at: process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 but task is already holding lock: 0000000097615964 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] 0000000097615964 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&sig->cred_guard_mutex){+.+.}: do_io_accounting fs/proc/base.c:2750 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2793 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4e0/0x11c0 fs/seq_file.c:232 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+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&p->lock){+.+.}: 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:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (sb_writers#3){.+.+}: file_start_write include/linux/fs.h:2779 [inline] ovl_write_iter+0x932/0xb40 fs/overlayfs/file.c:282 call_write_iter include/linux/fs.h:1821 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x51b/0x770 fs/read_write.c:487 vfs_write+0x1f3/0x540 fs/read_write.c:549 ksys_write+0x12b/0x2a0 fs/read_write.c:599 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&ovl_i_mutex_key[depth]#2){+.+.}: down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 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+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 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: &ovl_i_mutex_key[depth]#2 --> &p->lock --> &sig->cred_guard_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sig->cred_guard_mutex); lock(&p->lock); lock(&sig->cred_guard_mutex); lock(&ovl_i_mutex_key[depth]#2); *** DEADLOCK *** 1 lock held by syz-executor.2/11692: #0: 0000000097615964 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1419 [inline] #0: 0000000097615964 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file+0x38c/0x2360 fs/exec.c:1762 stack backtrace: CPU: 0 PID: 11692 Comm: syz-executor.2 Not tainted 4.19.211-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+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 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3908 down_write+0x34/0x90 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:748 [inline] process_measurement+0x926/0x1440 security/integrity/ima/ima_main.c:205 ima_file_check+0xb9/0x100 security/integrity/ima/ima_main.c:391 do_last fs/namei.c:3425 [inline] path_openat+0x7e4/0x2df0 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+0x1a8b/0x2360 fs/exec.c:1770 do_execveat_common fs/exec.c:1879 [inline] do_execve+0x35/0x50 fs/exec.c:1896 __do_sys_execve fs/exec.c:1977 [inline] __se_sys_execve fs/exec.c:1972 [inline] __x64_sys_execve+0x7c/0xa0 fs/exec.c:1972 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f69df6740e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f69ddfc8168 EFLAGS: 00000246 ORIG_RAX: 000000000000003b RAX: ffffffffffffffda RBX: 00007f69df787030 RCX: 00007f69df6740e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000180 RBP: 00007f69df6ce08d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe36fa007f R14: 00007f69ddfc8300 R15: 0000000000022000 Invalid argument reading file caps for ./file0 audit: type=1804 audit(1653295484.646:1729): pid=11715 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir1331060208/syzkaller.TUoZX0/866/bus" dev="sda1" ino=14307 res=1 syz-executor.4 (11696): drop_caches: 1 BTRFS error (device loop5): superblock checksum mismatch BTRFS error (device loop5): open_ctree failed Invalid argument reading file caps for ./file0 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) overlayfs: filesystem on './bus' not supported as upperdir syz-executor.4 (11694): drop_caches: 1 overlayfs: filesystem on './bus' not supported as upperdir Invalid argument reading file caps for ./file0 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 syz-executor.4 (11696): drop_caches: 1 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 syz-executor.4 (11694): drop_caches: 1 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=00000000) overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 Invalid argument reading file caps for ./file0 overlayfs: failed to resolve './bus': -40 syz-executor.4 (11830): drop_caches: 1 syz-executor.4 (11831): drop_caches: 1 syz-executor.4 (11830): drop_caches: 1 syz-executor.4 (11831): drop_caches: 1 nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead. Invalid argument reading file caps for ./file0 Invalid argument reading file caps for ./file0 FS-Cache: Duplicate cookie detected FS-Cache: O-cookie c=00000000b68c609b [p=00000000e5852d68 fl=222 nc=0 na=1] FS-Cache: O-cookie d=000000007f36e962 n=00000000356a4de2 FS-Cache: O-key=[10] '34323935303532323636' FS-Cache: N-cookie c=000000006b94df1c [p=00000000e5852d68 fl=2 nc=0 na=1] FS-Cache: N-cookie d=000000007f36e962 n=0000000051b13856 FS-Cache: N-key=[10] '34323935303532323636' FS-Cache: Duplicate cookie detected FS-Cache: O-cookie c=000000004a4faccf [p=00000000e5852d68 fl=222 nc=0 na=1] FS-Cache: O-cookie d=000000007f36e962 n=000000005f321045 FS-Cache: O-key=[10] '34323935303532323835' FS-Cache: N-cookie c=00000000399b0e8b [p=00000000e5852d68 fl=2 nc=0 na=1] FS-Cache: N-cookie d=000000007f36e962 n=00000000631305a3 FS-Cache: N-key=[10] '34323935303532323835' 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd netlink: 'syz-executor.2': attribute type 3 has an invalid length. 9pnet: Insufficient options for proto=fd netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. netlink: 'syz-executor.2': attribute type 3 has an invalid length. 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd 9pnet: Insufficient options for proto=fd