====================================================== WARNING: possible circular locking dependency detected 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.1/5692 is trying to acquire lock: 0000000009c57dff (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 but task is already holding lock: 00000000332e1016 (sb_writers#7){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] 00000000332e1016 (sb_writers#7){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (sb_writers#7){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_create_object+0x96/0x290 fs/overlayfs/dir.c:602 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (&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 -> #1 (&sig->cred_guard_mutex){+.+.}: 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 -> #0 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:937 [inline] __mutex_lock+0xd7/0x1190 kernel/locking/mutex.c:1078 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 other info that might help us debug this: Chain exists of: &p->lock --> &ovl_i_mutex_dir_key[depth] --> sb_writers#7 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#7); lock(&ovl_i_mutex_dir_key[depth]); lock(sb_writers#7); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor.1/5692: #0: 00000000332e1016 (sb_writers#7){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 00000000332e1016 (sb_writers#7){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 stack backtrace: CPU: 0 PID: 5692 Comm: syz-executor.1 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/18/2022 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 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 RIP: 0033:0x7f06500a4109 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:00007f064e9f8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f06501b7030 RCX: 00007f06500a4109 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007f06500fe05d R08: 0000000000000000 R09: 0000000000000000 R10: 00000000fffffffe R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff806b08af R14: 00007f064e9f8300 R15: 0000000000022000 overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' kauditd_printk_skb: 93 callbacks suppressed audit: type=1800 audit(1656684396.679:4114): pid=5718 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name="file0" dev="sda1" ino=15712 res=0 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' tmpfs: Bad value '0xffffffffffffffff' for mount option 'gid' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' overlayfs: missing 'lowerdir' qnx4: no qnx4 filesystem (no root dir). audit: type=1326 audit(1656684397.689:4116): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 tmpfs: Bad value '0xffffffffffffffff' for mount option 'gid' audit: type=1326 audit(1656684397.689:4117): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4118): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4119): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4120): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4121): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4122): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 audit: type=1326 audit(1656684397.689:4123): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 vhci_hcd: Failed attach request for unsupported USB speed: UNKNOWN audit: type=1326 audit(1656684397.689:4124): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5773 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=3 compat=0 ip=0x7f0650056d4b code=0x50000 qnx4: no qnx4 filesystem (no root dir). tmpfs: Bad value '0xffffffffffffffff' for mount option 'gid' qnx4: no qnx4 filesystem (no root dir). tmpfs: Bad value '0xffffffffffffffff' for mount option 'gid' qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir). kauditd_printk_skb: 5396 callbacks suppressed audit: type=1326 audit(1656684401.679:9521): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.669:9461): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9522): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9523): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9524): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9525): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9526): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9527): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9528): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 audit: type=1326 audit(1656684401.689:9529): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=5960 comm="syz-executor.1" exe="/root/syz-executor.1" sig=0 arch=c000003e syscall=202 compat=0 ip=0x7f06500a4109 code=0x50000 qnx4: no qnx4 filesystem (no root dir). qnx4: no qnx4 filesystem (no root dir).