Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
---|---|---|---|---|---|---|---|---|
possible deadlock in ovl_copy_up_one overlayfs | C | 4 | 83d | 79d | 0/27 | closed as dup on 2024/06/14 07:11 |
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Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
---|---|---|---|---|---|---|---|---|
possible deadlock in ovl_copy_up_one overlayfs | C | 4 | 83d | 79d | 0/27 | closed as dup on 2024/06/14 07:11 |
Title | Replies (including bot) | Last reply |
---|---|---|
[syzbot] [btrfs?] [overlayfs?] possible deadlock in ovl_copy_up_flags | 2 (4) | 2024/05/27 21:36 |
Created | Duration | User | Patch | Repo | Result |
---|---|---|---|---|---|
2024/05/27 13:51 | 30m | miklos@szeredi.hu | git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git f74ee925761ead1a07a5e42e1cb1f2d59ab75b8c | OK log |
============================================ WARNING: possible recursive locking detected 6.10.0-rc2-syzkaller-00366-g771ed66105de #0 Not tainted -------------------------------------------- syz-executor122/5081 is trying to acquire lock: ffff88802f7a2420 (sb_writers#4){.+.+}-{0:0}, at: ovl_do_copy_up fs/overlayfs/copy_up.c:967 [inline] ffff88802f7a2420 (sb_writers#4){.+.+}-{0:0}, at: ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline] ffff88802f7a2420 (sb_writers#4){.+.+}-{0:0}, at: ovl_copy_up_flags+0x1110/0x4470 fs/overlayfs/copy_up.c:1223 but task is already holding lock: ffff88802f7a2420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(sb_writers#4); lock(sb_writers#4); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syz-executor122/5081: #0: ffff888022d3a420 (sb_writers#9){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #1: ffff88802f7a2420 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409 #2: ffff88807d238528 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_inode_lock_interruptible fs/overlayfs/overlayfs.h:657 [inline] #2: ffff88807d238528 (&ovl_i_lock_key[depth]){+.+.}-{3:3}, at: ovl_copy_up_start+0x53/0x310 fs/overlayfs/util.c:719 stack backtrace: CPU: 1 PID: 5081 Comm: syz-executor122 Not tainted 6.10.0-rc2-syzkaller-00366-g771ed66105de #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 check_deadlock kernel/locking/lockdep.c:3062 [inline] validate_chain+0x15d3/0x5900 kernel/locking/lockdep.c:3856 __lock_acquire+0x1346/0x1fd0 kernel/locking/lockdep.c:5137 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 percpu_down_read include/linux/percpu-rwsem.h:51 [inline] __sb_start_write include/linux/fs.h:1655 [inline] sb_start_write include/linux/fs.h:1791 [inline] ovl_start_write+0x11d/0x290 fs/overlayfs/util.c:31 ovl_do_copy_up fs/overlayfs/copy_up.c:967 [inline] ovl_copy_up_one fs/overlayfs/copy_up.c:1168 [inline] ovl_copy_up_flags+0x1110/0x4470 fs/overlayfs/copy_up.c:1223 ovl_create_tmpfile fs/overlayfs/dir.c:1317 [inline] ovl_tmpfile+0x262/0x6d0 fs/overlayfs/dir.c:1373 vfs_tmpfile+0x396/0x510 fs/namei.c:3701 do_tmpfile+0x156/0x340 fs/namei.c:3764 path_openat+0x2ab8/0x3280 fs/namei.c:3798 do_filp_open+0x235/0x490 fs/namei.c:3834 do_sys_openat2+0x13e/0x1d0 fs/open.c:1405 do_sys_open fs/open.c:1420 [inline] __do_sys_open fs/open.c:1428 [inline] __se_sys_open fs/open.c:1424 [inline] __x64_sys_open+0x225/0x270 fs/open.c:1424 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4cddd5ef49 Code: 48 83 c4 28 c3 e8 67 17 00 00 0f 1f 80 00 00 00 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:00007ffc02708338 EFLAGS: 00000246 ORIG_RAX: 000000000
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2024/06/09 23:43 | upstream | 771ed66105de | 82c05ab8 | .config | strace log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in ovl_copy_up_flags | |
2024/06/08 07:58 | upstream | 96e09b8f8166 | 82c05ab8 | .config | strace log | report | syz / log | C | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in ovl_copy_up_flags | |
2024/05/19 11:11 | linux-next | c75962170e49 | c0f1611a | .config | strace log | report | syz | C | [disk image] [vmlinux] [kernel image] [mounted in repro] | ci-upstream-linux-next-kasan-gce-root | possible deadlock in ovl_copy_up_flags | |
2024/06/13 12:05 | upstream | 2ccbdf43d5e7 | 2aa5052f | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in ovl_copy_up_flags | ||
2024/06/09 23:02 | upstream | 771ed66105de | 82c05ab8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in ovl_copy_up_flags | ||
2024/06/09 22:56 | upstream | 771ed66105de | 82c05ab8 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | possible deadlock in ovl_copy_up_flags | ||
2024/05/19 10:03 | linux-next | c75962170e49 | c0f1611a | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-linux-next-kasan-gce-root | possible deadlock in ovl_copy_up_flags |