====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/29553 is trying to acquire lock: 00000000b5cb5854 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2750 [inline] 00000000b5cb5854 (&sig->cred_guard_mutex){+.+.}, at: proc_tgid_io_accounting+0x1cf/0x7f0 fs/proc/base.c:2799 but task is already holding lock: 000000007c4937e4 (&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){+.+.}: 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 -> #2 (sb_writers#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_xattr_set+0x53/0x600 fs/overlayfs/inode.c:338 __vfs_setxattr+0x10e/0x170 fs/xattr.c:149 __vfs_setxattr_noperm+0x11a/0x420 fs/xattr.c:180 __vfs_setxattr_locked+0x176/0x250 fs/xattr.c:238 vfs_setxattr+0xe5/0x270 fs/xattr.c:255 setxattr+0x23d/0x330 fs/xattr.c:520 path_setxattr+0x170/0x190 fs/xattr.c:539 __do_sys_setxattr fs/xattr.c:554 [inline] __se_sys_setxattr fs/xattr.c:550 [inline] __x64_sys_setxattr+0xc0/0x160 fs/xattr.c:550 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] do_last fs/namei.c:3326 [inline] path_openat+0x17ec/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 -> #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 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.3/29553: #0: 0000000028320868 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 000000007c4937e4 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 1 PID: 29553 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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 __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 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: 0033:0x7f899eef3109 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:00007f899d868168 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 00007f899f005f60 RCX: 00007f899eef3109 RDX: 0000000000002020 RSI: 0000000020004a00 RDI: 0000000000000005 RBP: 00007f899ef4d05d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd29138e5f R14: 00007f899d868300 R15: 0000000000022000 FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) kauditd_printk_skb: 150 callbacks suppressed audit: type=1800 audit(1657123435.479:19213): pid=29946 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14987 res=0 audit: type=1800 audit(1657123435.479:19214): pid=29946 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14987 res=0 audit: type=1800 audit(1657123435.509:19215): pid=29949 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15004 res=0 FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value audit: type=1800 audit(1657123435.509:19216): pid=29949 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15004 res=0 audit: type=1800 audit(1657123435.509:19217): pid=29950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14992 res=0 audit: type=1800 audit(1657123435.509:19218): pid=29950 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14992 res=0 audit: type=1800 audit(1657123435.529:19219): pid=29948 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=15001 res=0 audit: type=1800 audit(1657123435.529:19220): pid=29948 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=15001 res=0 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) audit: type=1800 audit(1657123435.659:19221): pid=29983 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14943 res=0 audit: type=1800 audit(1657123435.659:19222): pid=29983 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=14943 res=0 FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 1 PID: 30412 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 fail_dump lib/fault-inject.c:51 [inline] should_fail.cold+0xa/0xf lib/fault-inject.c:149 __should_failslab+0x115/0x180 mm/failslab.c:32 should_failslab+0x5/0x10 mm/slab_common.c:1590 slab_pre_alloc_hook mm/slab.h:424 [inline] slab_alloc mm/slab.c:3383 [inline] kmem_cache_alloc+0x277/0x370 mm/slab.c:3557 kmem_cache_zalloc include/linux/slab.h:699 [inline] cred_alloc_blank+0x19/0xd0 kernel/cred.c:214 keyctl_session_to_parent+0x51/0xa20 security/keys/keyctl.c:1576 __do_sys_keyctl security/keys/keyctl.c:1783 [inline] __se_sys_keyctl+0x186/0x3f0 security/keys/keyctl.c:1701 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f899eef3109 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:00007f899d868168 EFLAGS: 00000246 ORIG_RAX: 00000000000000fa RAX: ffffffffffffffda RBX: 00007f899f005f60 RCX: 00007f899eef3109 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000012 RBP: 00007f899d8681d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007ffd29138e5f R14: 00007f899d868300 R15: 0000000000022000 BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value BFS-fs: bfs_fill_super(): No BFS filesystem on loop5 (magic=26574c49) FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value FAT-fs (loop5): Unrecognized mount option "appraise_type=imasig" or missing value kauditd_printk_skb: 218 callbacks suppressed audit: type=1800 audit(1657123440.489:19441): pid=30653 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14950 res=0 audit: type=1800 audit(1657123440.489:19442): pid=30653 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14950 res=0 audit: type=1800 audit(1657123440.489:19443): pid=30659 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15233 res=0 audit: type=1800 audit(1657123440.489:19444): pid=30656 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15233 res=0 audit: type=1800 audit(1657123440.629:19445): pid=30669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=15003 res=0 audit: type=1800 audit(1657123440.629:19446): pid=30669 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.2" name="bus" dev="sda1" ino=15003 res=0 audit: type=1800 audit(1657123440.639:19447): pid=30667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=14971 res=0 audit: type=1800 audit(1657123440.639:19448): pid=30667 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.5" name="bus" dev="sda1" ino=14971 res=0 audit: type=1800 audit(1657123440.649:19449): pid=30674 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15035 res=0 audit: type=1800 audit(1657123440.649:19450): pid=30670 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="bus" dev="sda1" ino=15035 res=0