atomic_op 000000007b22c8c6 conn xmit_atomic (null) ====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.3/13813 is trying to acquire lock: 0000000040e2d176 (&sig->cred_guard_mutex){+.+.}, at: lock_trace fs/proc/base.c:402 [inline] 0000000040e2d176 (&sig->cred_guard_mutex){+.+.}, at: proc_pid_stack+0x160/0x350 fs/proc/base.c:452 but task is already holding lock: 0000000053faf470 (&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_lsetxattr fs/xattr.c:561 [inline] __se_sys_lsetxattr fs/xattr.c:557 [inline] __x64_sys_lsetxattr+0xbd/0x150 fs/xattr.c:557 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 link_path_walk.part.0+0x901/0x1230 fs/namei.c:2142 link_path_walk fs/namei.c:2073 [inline] path_openat+0x1db/0x2df0 fs/namei.c:3536 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_stack+0x160/0x350 fs/proc/base.c:452 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 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.3/13813: #0: 0000000053faf470 (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 stack backtrace: CPU: 1 PID: 13813 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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 lock_trace fs/proc/base.c:402 [inline] proc_pid_stack+0x160/0x350 fs/proc/base.c:452 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 RIP: 0033:0x7f79c1b03279 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:00007f79c0478168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f79c1c15f80 RCX: 00007f79c1b03279 RDX: 0000000000000218 RSI: 00000000200017c0 RDI: 0000000000000004 RBP: 00007f79c1b5d2e9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff2a93464f R14: 00007f79c0478300 R15: 0000000000022000 befs: Unrecognized mount option "^-x'%x@" or missing value NILFS (loop4): couldn't find nilfs on the device befs: (loop3): cannot parse mount options audit: type=1804 audit(1661927744.295:617): pid=13853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3413125851/syzkaller.hPrhZx/902/bus" dev="sda1" ino=14942 res=1 audit: type=1800 audit(1661927744.295:618): pid=13853 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=14942 res=0 NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop3): cannot parse mount options audit: type=1804 audit(1661927745.145:619): pid=13943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3413125851/syzkaller.hPrhZx/903/bus" dev="sda1" ino=13967 res=1 audit: type=1800 audit(1661927745.145:620): pid=13943 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=13967 res=0 NILFS (loop4): couldn't find nilfs on the device audit: type=1804 audit(1661927745.335:621): pid=13967 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2971394251/syzkaller.hbpyEL/991/bus" dev="sda1" ino=13962 res=1 audit: type=1800 audit(1661927745.335:622): pid=13967 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=13962 res=0 audit: type=1804 audit(1661927746.065:623): pid=13995 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.1" name="/root/syzkaller-testdir3413125851/syzkaller.hPrhZx/904/bus" dev="sda1" ino=13958 res=1 audit: type=1800 audit(1661927746.065:624): pid=13995 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.1" name="bus" dev="sda1" ino=13958 res=0 NILFS (loop4): couldn't find nilfs on the device audit: type=1804 audit(1661927746.265:625): pid=14027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.3" name="/root/syzkaller-testdir2971394251/syzkaller.hbpyEL/992/bus" dev="sda1" ino=13961 res=1 audit: type=1800 audit(1661927746.265:626): pid=14027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.3" name="bus" dev="sda1" ino=13961 res=0 NILFS (loop4): couldn't find nilfs on the device f2fs_msg: 158 callbacks suppressed F2FS-fs (loop5): Magic Mismatch, valid(0xf2f52010) - read(0x0) NILFS (loop4): couldn't find nilfs on the device F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): Small segment_count (30 < 2 * 18) F2FS-fs (loop5): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop2): Invalid segment/section count (30, 18443 x 2) F2FS-fs (loop2): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop3): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value NILFS (loop4): couldn't find nilfs on the device befs: (loop1): cannot parse mount options befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop3): cannot parse mount options befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value NILFS (loop4): couldn't find nilfs on the device befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device f2fs_msg: 350 callbacks suppressed F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0) NILFS (loop4): couldn't find nilfs on the device F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop2): Invalid segment/section count (30, 1245195 x 2) F2FS-fs (loop2): Can't find valid F2FS filesystem in 2th superblock F2FS-fs (loop2): Magic Mismatch, valid(0xf2f52010) - read(0x0) F2FS-fs (loop5): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): Small segment_count (30 < 2 * 18) F2FS-fs (loop2): Can't find valid F2FS filesystem in 1th superblock F2FS-fs (loop5): Can't find valid F2FS filesystem in 2th superblock befs: Unrecognized mount option "^-x'%x@" or missing value NILFS (loop4): couldn't find nilfs on the device befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options befs: Unrecognized mount option "^-x'%x@" or missing value NILFS (loop4): couldn't find nilfs on the device befs: (loop1): cannot parse mount options befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options NILFS (loop4): couldn't find nilfs on the device befs: Unrecognized mount option "^-x'%x@" or missing value befs: (loop1): cannot parse mount options