audit: type=1804 audit(1647005563.743:290): pid=30183 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/274/bus" dev="sda1" ino=13959 res=1
======================================================
WARNING: possible circular locking dependency detected
4.19.211-syzkaller #0 Not tainted
------------------------------------------------------
syz-executor.1/30183 is trying to acquire lock:
00000000fc0a2a5b (&sig->cred_guard_mutex){+.+.}, at: lock_trace fs/proc/base.c:402 [inline]
00000000fc0a2a5b (&sig->cred_guard_mutex){+.+.}, at: proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
but task is already holding lock:
000000008b349abe (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164
ptrace attach of "/root/syz-executor.5 exec"[8132] was attempted by "/root/syz-executor.5 exec"[30192]
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
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_setattr+0xdd/0x920 fs/overlayfs/inode.c:30
notify_change+0x70b/0xfc0 fs/attr.c:334
chown_common+0x4a9/0x550 fs/open.c:651
do_fchownat+0x126/0x1e0 fs/open.c:681
__do_sys_chown fs/open.c:701 [inline]
__se_sys_chown fs/open.c:699 [inline]
__x64_sys_chown+0x77/0xb0 fs/open.c:699
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
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
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
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
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.1/30183:
#0: 000000000b71dc29 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline]
#0: 000000000b71dc29 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446
#1: 000000008b349abe (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164
stack backtrace:
CPU: 0 PID: 30183 Comm: syz-executor.1 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
__mutex_lock_common kernel/locking/mutex.c:937 [inline]
__mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078
lock_trace fs/proc/base.c:402 [inline]
proc_pid_personality+0x4a/0x170 fs/proc/base.c:2938
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
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
RIP: 0033:0x7f69b79b2049
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:00007f69b6327168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f69b7ac4f60 RCX: 00007f69b79b2049
RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000004
RBP: 00007f69b7a0c08d R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000f6c4 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe170e41cf R14: 00007f69b6327300 R15: 0000000000022000
audit: type=1804 audit(1647005564.743:291): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:292): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:293): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:294): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:295): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:296): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
tmpfs: No value for mount option '0xffffffffffffffffbu'
audit: type=1804 audit(1647005564.743:297): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
audit: type=1804 audit(1647005564.743:298): pid=30231 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3435445604/syzkaller.CglP3n/275/bus" dev="sda1" ino=13944 res=1
ptrace attach of "/root/syz-executor.5 exec"[8132] was attempted by "/root/syz-executor.5 exec"[30264]
tmpfs: No value for mount option '0xffffffffffffffffbu'
tmpfs: No value for mount option '0xffffffffffffffffbu'
ptrace attach of "/root/syz-executor.5 exec"[8132] was attempted by "/root/syz-executor.5 exec"[30325]
tmpfs: No value for mount option '0xffffffffffffffffbu'
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.
kauditd_printk_skb: 58 callbacks suppressed
audit: type=1800 audit(1647005565.673:357): pid=30448 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.4" name="SYSV00000000" dev="hugetlbfs" ino=0 res=0
audit: type=1800 audit(1647005565.783:358): pid=30465 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=13871 res=0
audit: type=1800 audit(1647005566.064:359): pid=30513 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=65536 res=0
audit: type=1800 audit(1647005566.204:360): pid=30530 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.4" name="SYSV00000000" dev="hugetlbfs" ino=32768 res=0
audit: type=1800 audit(1647005566.244:361): pid=30537 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=98306 res=0
audit: type=1800 audit(1647005566.574:362): pid=30550 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed comm="syz-executor.3" name="SYSV00000000" dev="hugetlbfs" ino=131075 res=0
audit: type=1800 audit(1647005566.704:363): pid=30571 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14321 res=0
audit: type=1800 audit(1647005566.784:364): pid=30588 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14321 res=0
IPVS: ftp: loaded support on port[0] = 21
audit: type=1800 audit(1647005567.254:365): pid=30630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14705 res=0
audit: type=1800 audit(1647005567.294:366): pid=30630 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14705 res=0
new mount options do not match the existing superblock, will be ignored
IPVS: ftp: loaded support on port[0] = 21
new mount options do not match the existing superblock, will be ignored
new mount options do not match the existing superblock, will be ignored
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
team0: Port device bridge4 added
team0: Port device bridge5 added
team0: Port device bridge6 added
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
IPVS: ftp: loaded support on port[0] = 21
raw_sendmsg: syz-executor.5 forgot to set AF_INET. Fix it!
kauditd_printk_skb: 30 callbacks suppressed
audit: type=1800 audit(1647005572.254:397): pid=31273 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=14577 res=0
audit: type=1800 audit(1647005572.914:398): pid=31312 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.0" name="bus" dev="sda1" ino=15270 res=0