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Wed, 18 Dec 2024 19:07:01 -0800 (PST) Date: Wed, 18 Dec 2024 19:07:01 -0800 In-Reply-To: <20241219025654.2644604-1-lizhi.xu@windriver.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67638dd5.050a0220.15da49.0004.GAE@google.com> Subject: Re: [syzbot] [jfs?] possible deadlock in diFree (2) From: syzbot To: linux-kernel@vger.kernel.org, lizhi.xu@windriver.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: possible deadlock in diFree ERROR: (device loop0): remounting filesystem as read-only ERROR: (device loop0): duplicateIXtree: ====================================================== WARNING: possible circular locking dependency detected 6.13.0-rc3-syzkaller-geabcdba3ad40-dirty #0 Not tainted ------------------------------------------------------ syz.0.15/5791 is trying to acquire lock: ffff88804f3e0920 (&(imap->im_aglock[index])){+.+.}-{4:4}, at: diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 but task is already holding lock: ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline] ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0x866/0x1ee0 fs/jfs/jfs_imap.c:1669 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&jfs_ip->rdwrlock/1){++++}-{4:4}: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 down_read_nested+0xb5/0xa50 kernel/locking/rwsem.c:1649 diAlloc+0x775/0x1630 fs/jfs/jfs_imap.c:1388 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_create+0x1be/0xbb0 fs/jfs/namei.c:92 lookup_open fs/namei.c:3649 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x1c03/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 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 -> #0 (&(imap->im_aglock[index])){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156 evict+0x4e8/0x9a0 fs/inode.c:796 diFreeSpecial fs/jfs/jfs_imap.c:552 [inline] duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3024 diNewIAG fs/jfs/jfs_imap.c:2598 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x1805/0x1ee0 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311 do_mkdirat+0x264/0x3a0 fs/namei.c:4334 __do_sys_mkdirat fs/namei.c:4349 [inline] __se_sys_mkdirat fs/namei.c:4347 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347 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 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&jfs_ip->rdwrlock/1); lock(&(imap->im_aglock[index])); lock(&jfs_ip->rdwrlock/1); lock(&(imap->im_aglock[index])); *** DEADLOCK *** 4 locks held by syz.0.15/5791: #0: ffff888000c70420 (sb_writers#13){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff8880420f3390 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:853 [inline] #1: ffff8880420f3390 (&type->i_mutex_dir_key#8/1){+.+.}-{4:4}, at: filename_create+0x260/0x540 fs/namei.c:4080 #2: ffff88804f3e0890 (&imap->im_freelock){+.+.}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2460 [inline] #2: ffff88804f3e0890 (&imap->im_freelock){+.+.}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #2: ffff88804f3e0890 (&imap->im_freelock){+.+.}-{4:4}, at: diAllocAG+0x49b/0x1ee0 fs/jfs/jfs_imap.c:1669 #3: ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diNewIAG fs/jfs/jfs_imap.c:2477 [inline] #3: ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocExt fs/jfs/jfs_imap.c:1905 [inline] #3: ffff8880420f2618 (&jfs_ip->rdwrlock/1){++++}-{4:4}, at: diAllocAG+0x866/0x1ee0 fs/jfs/jfs_imap.c:1669 stack backtrace: CPU: 0 UID: 0 PID: 5791 Comm: syz.0.15 Not tainted 6.13.0-rc3-syzkaller-geabcdba3ad40-dirty #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 print_circular_bug+0x13a/0x1b0 kernel/locking/lockdep.c:2074 check_noncircular+0x36a/0x4a0 kernel/locking/lockdep.c:2206 check_prev_add kernel/locking/lockdep.c:3161 [inline] check_prevs_add kernel/locking/lockdep.c:3280 [inline] validate_chain+0x18ef/0x5920 kernel/locking/lockdep.c:3904 __lock_acquire+0x1397/0x2100 kernel/locking/lockdep.c:5226 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 __mutex_lock_common kernel/locking/mutex.c:585 [inline] __mutex_lock+0x1ac/0xee0 kernel/locking/mutex.c:735 diFree+0x37c/0x2fb0 fs/jfs/jfs_imap.c:889 jfs_evict_inode+0x32d/0x440 fs/jfs/inode.c:156 evict+0x4e8/0x9a0 fs/inode.c:796 diFreeSpecial fs/jfs/jfs_imap.c:552 [inline] duplicateIXtree+0x3c6/0x550 fs/jfs/jfs_imap.c:3024 diNewIAG fs/jfs/jfs_imap.c:2598 [inline] diAllocExt fs/jfs/jfs_imap.c:1905 [inline] diAllocAG+0x1805/0x1ee0 fs/jfs/jfs_imap.c:1669 diAlloc+0x1d2/0x1630 fs/jfs/jfs_imap.c:1590 ialloc+0x8f/0x900 fs/jfs/jfs_inode.c:56 jfs_mkdir+0x1c5/0xba0 fs/jfs/namei.c:225 vfs_mkdir+0x2f9/0x4f0 fs/namei.c:4311 do_mkdirat+0x264/0x3a0 fs/namei.c:4334 __do_sys_mkdirat fs/namei.c:4349 [inline] __se_sys_mkdirat fs/namei.c:4347 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347 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: 0033:0x7f849617e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8496ecc038 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f8496335f80 RCX: 00007f849617e719 RDX: 0000000000000000 RSI: 00000000200005c0 RDI: ffffffffffffff9c RBP: 00007f84961f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f8496335f80 R15: 00007ffec77ff6a8 Tested on: commit: eabcdba3 Merge tag 'for-6.13-rc3-tag' of git://git.ker.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=12b5b7e8580000 kernel config: https://syzkaller.appspot.com/x/.config?x=f339dc38531e69a7 dashboard link: https://syzkaller.appspot.com/bug?extid=355da3b3a74881008e8f compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=15e5b7e8580000