BTRFS info (device loop3): disk space caching is enabled ====================================================== WARNING: possible circular locking dependency detected 4.19.172-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.5/21912 is trying to acquire lock: 000000007b822128 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting fs/proc/base.c:2737 [inline] 000000007b822128 (&sig->cred_guard_mutex){+.+.}, at: proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 but task is already holding lock: 000000006c0fc439 (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: seq_read+0x6b/0x1160 fs/seq_file.c:161 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 BTRFS info (device loop3): has skinny extents __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_create_object+0x96/0x290 fs/overlayfs/dir.c:600 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 BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found B71E2BE6 level 0 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 BTRFS warning (device loop3): failed to read tree root -> #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:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2737 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4be/0x1160 fs/seq_file.c:229 __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.5/21912: #0: 0000000093a5d30f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 #1: 000000006c0fc439 (&p->lock){+.+.}, at: seq_read+0x6b/0x1160 fs/seq_file.c:161 stack backtrace: CPU: 0 PID: 21912 Comm: syz-executor.5 Not tainted 4.19.172-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:1221 check_prev_add kernel/locking/lockdep.c:1865 [inline] check_prevs_add kernel/locking/lockdep.c:1978 [inline] validate_chain kernel/locking/lockdep.c:2419 [inline] __lock_acquire+0x30c9/0x3ff0 kernel/locking/lockdep.c:3415 lock_acquire+0x170/0x3c0 kernel/locking/lockdep.c:3907 __mutex_lock_common kernel/locking/mutex.c:925 [inline] __mutex_lock+0xd7/0x1260 kernel/locking/mutex.c:1072 do_io_accounting fs/proc/base.c:2737 [inline] proc_tid_io_accounting+0x184/0x2b0 fs/proc/base.c:2780 proc_single_show+0xeb/0x170 fs/proc/base.c:755 seq_read+0x4be/0x1160 fs/seq_file.c:229 __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: 0033:0x465b09 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa1662b4188 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465b09 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007ffcb082d4af R14: 00007fa1662b4300 R15: 0000000000022000 BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium x_tables: duplicate underflow at hook 2 BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 214789DD level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents csum_tree_block: 1 callbacks suppressed BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found A4C4D3BA level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents audit: type=1326 audit(1612432143.842:366): auid=4294967295 uid=0 gid=0 ses=4294967295 subj==unconfined pid=22608 comm="syz-executor.4" exe="/root/syz-executor.4" sig=31 arch=c000003e syscall=202 compat=0 ip=0x465b09 code=0x0 BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found A4C4D3BA level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found A4C4D3BA level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed mac80211_hwsim: wmediumd released netlink socket, switching to perfect channel medium BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 90ECB6A8 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 90ECB6A8 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 90ECB6A8 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 29086022 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 29086022 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 29086022 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 29086022 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): force clearing of disk cache BTRFS info (device loop3): turning on flush-on-commit BTRFS info (device loop3): disk space caching is enabled netlink: 116 bytes leftover after parsing attributes in process `syz-executor.5'. BTRFS info (device loop3): has skinny extents csum_tree_block: 2 callbacks suppressed BTRFS warning (device loop3): loop3 checksum verify failed on 5242880 wanted 42BCE6B8 found 9F023508 level 0 BTRFS warning (device loop3): failed to read tree root BTRFS error (device loop3): open_ctree failed