BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled ====================================================== WARNING: possible circular locking dependency detected BTRFS info (device loop3): has skinny extents 4.19.211-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/26000 is trying to acquire lock: 000000001bad78cd (&p->lock){+.+.}, at: seq_read+0x6b/0x11c0 fs/seq_file.c:164 but task is already holding lock: 000000001ec26ca8 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] 000000001ec26ca8 (sb_writers#3){.+.+}, 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#3){.+.+}: sb_start_write include/linux/fs.h:1579 [inline] mnt_want_write+0x3a/0xb0 fs/namespace.c:360 ovl_fix_origin fs/overlayfs/namei.c:796 [inline] ovl_lookup+0x1109/0x1a00 fs/overlayfs/namei.c:915 __lookup_slow+0x246/0x4a0 fs/namei.c:1672 lookup_slow fs/namei.c:1689 [inline] walk_component+0x7ac/0xda0 fs/namei.c:1811 lookup_last fs/namei.c:2274 [inline] path_lookupat+0x1ff/0x8d0 fs/namei.c:2319 filename_lookup+0x1ac/0x5a0 fs/namei.c:2349 user_path include/linux/namei.h:62 [inline] do_mount+0x147/0x2f50 fs/namespace.c:2762 ksys_mount+0xcf/0x130 fs/namespace.c:3038 __do_sys_mount fs/namespace.c:3052 [inline] __se_sys_mount fs/namespace.c:3049 [inline] __x64_sys_mount+0xba/0x150 fs/namespace.c:3049 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]#2){++++}: 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){+.+.}: 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 __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 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 other info that might help us debug this: Chain exists of: &p->lock --> &ovl_i_mutex_dir_key[depth]#2 --> sb_writers#3 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(sb_writers#3); lock(&ovl_i_mutex_dir_key[depth]#2); lock(sb_writers#3); lock(&p->lock); *** DEADLOCK *** 1 lock held by syz-executor.0/26000: #0: 000000001ec26ca8 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000001ec26ca8 (sb_writers#3){.+.+}, at: do_sendfile+0x97d/0xc30 fs/read_write.c:1446 stack backtrace: CPU: 1 PID: 26000 Comm: syz-executor.0 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 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 RIP: 0033:0x7f0e2e399109 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:00007f0e2cd0e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f0e2e4abf60 RCX: 00007f0e2e399109 RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000004 RBP: 00007f0e2e3f30ed R08: 0000000000000000 R09: 0000000000000000 R10: 4000000000010046 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffeba24bbdf R14: 00007f0e2cd0e300 R15: 0000000000022000 BTRFS error (device loop3): open_ctree failed BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 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 5292032 wanted EDC5BD3 found 1110B6F3 level 0 xt_CT: You must specify a L4 protocol and not use inversions on it BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents xt_CT: You must specify a L4 protocol and not use inversions on it BTRFS warning (device loop3): loop3 checksum verify failed on 5292032 wanted EDC5BD3 found E091B85E level 0 xt_CT: You must specify a L4 protocol and not use inversions on it BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 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 5292032 wanted EDC5BD3 found E091B85E level 0 netlink: 'syz-executor.1': attribute type 1 has an invalid length. netlink: 232 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 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 5292032 wanted EDC5BD3 found E091B85E level 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 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 5292032 wanted EDC5BD3 found EB6927C1 level 0 netlink: 'syz-executor.1': attribute type 1 has an invalid length. netlink: 232 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents netlink: 'syz-executor.1': attribute type 1 has an invalid length. netlink: 232 bytes leftover after parsing attributes in process `syz-executor.1'. netlink: 8 bytes leftover after parsing attributes in process `syz-executor.1'. BTRFS warning (device loop3): loop3 checksum verify failed on 5292032 wanted EDC5BD3 found EB6927C1 level 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 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 5292032 wanted EDC5BD3 found EB6927C1 level 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS error (device loop3): bad tree block start, want 5292032 have 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS error (device loop3): bad tree block start, want 5292032 have 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0 BTRFS info (device loop3): disk space caching is enabled BTRFS info (device loop3): has skinny extents BTRFS error (device loop3): bad tree block start, want 5292032 have 0 BTRFS info (device loop3): setting 8 feature flag BTRFS info (device loop3): force lzo compression, level 0