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AKwUvBzJMVoMU0c2yDj1l0PIWZdgSW31aEM1e1pq5uFlLqvIRj8pm5V0qgVGiM8w4bmj6s65TtRri9HE/zgtjBc=@vger.kernel.org X-Gm-Message-State: AFuF++n5UXlbuQrYUPvLotdMz0LHBPgIQ0UuQviGrDcaWQccv+FoPrq9 9w35rBtiKhUNc/asQbjeU02hozoOoPfBb90n4Tes87WoIil0tYWDE22YpQMZ4vcztgHTL+ljp3x VVG3ThTRpYYJkxIbHnsAAOcKd61AWVfWpz9HJpDD8EKtl+460U6weR8CYpr0= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:55d6:10b0:6b7:46e9:9705 with SMTP id 006d021491bc7-6c0bcea9081mr922646eaf.53.1789097161685; Thu, 10 Sep 2026 20:26:01 -0700 (PDT) Date: Thu, 10 Sep 2026 20:26:01 -0700 In-Reply-To: <20260911030325.842624-1-eadavis@sina.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6aa374c9.f2639fcc.29487d.0022.GAE@google.com> Subject: Re: [syzbot] [jffs2?] possible deadlock in jffs2_do_clear_inode (2) From: syzbot To: eadavis@sina.com, linux-kernel@vger.kernel.org, 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 jffs2_do_clear_inode ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ kswapd0/113 is trying to acquire lock: ffff888013a1ac60 (&f->sem){+.+.}-{4:4}, at: jffs2_do_clear_inode+0x5a/0x470 fs/jffs2/readinode.c:1419 but task is already holding lock: ffffffff8efc9a20 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xbce/0x1f00 mm/vmscan.c:7292 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (fs_reclaim){+.+.}-{0:0}: lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __fs_reclaim_acquire mm/page_alloc.c:4375 [inline] fs_reclaim_acquire+0xc4/0x100 mm/page_alloc.c:4389 might_alloc include/linux/sched/mm.h:316 [inline] slab_pre_alloc_hook mm/slub.c:4636 [inline] slab_alloc_node mm/slub.c:4974 [inline] __do_kmalloc_node mm/slub.c:5413 [inline] __kmalloc_noprof+0xce/0x840 mm/slub.c:5439 _kmalloc_noprof include/linux/slab.h:995 [inline] jffs2_get_inode_nodes fs/jffs2/readinode.c:997 [inline] jffs2_do_read_inode_internal+0x13d/0x4ac0 fs/jffs2/readinode.c:1160 jffs2_do_read_inode+0x1b3/0x520 fs/jffs2/readinode.c:1389 jffs2_iget+0x32b/0xe30 fs/jffs2/fs.c:277 jffs2_do_fill_super+0x44b/0xa50 fs/jffs2/fs.c:578 jffs2_fill_super+0x283/0x370 fs/jffs2/super.c:290 mtd_get_sb+0x2f0/0x4c0 drivers/mtd/mtdsuper.c:57 mtd_get_sb_by_nr drivers/mtd/mtdsuper.c:88 [inline] get_tree_mtd+0x6f9/0x8a0 drivers/mtd/mtdsuper.c:141 vfs_get_tree+0x92/0x320 fs/super.c:1947 fc_mount fs/namespace.c:1198 [inline] do_new_mount_fc fs/namespace.c:3772 [inline] do_new_mount fs/namespace.c:3848 [inline] path_mount+0x7d0/0x24c0 fs/namespace.c:4168 do_mount fs/namespace.c:4181 [inline] __do_sys_mount fs/namespace.c:4397 [inline] __se_sys_mount fs/namespace.c:4374 [inline] __ia32_sys_mount+0x292/0x310 fs/namespace.c:4374 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:79 [inline] __do_fast_syscall_32+0x13a/0x8b0 arch/x86/entry/syscall_32.c:291 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:316 entry_SYSENTER_compat_after_hwframe+0x84/0x8e -> #0 (&f->sem){+.+.}-{4:4}: check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 jffs2_do_clear_inode+0x5a/0x470 fs/jffs2/readinode.c:1419 evict+0x3c2/0xad0 fs/inode.c:822 dispose_list+0x117/0x1e0 fs/inode.c:864 prune_icache_sb+0xea/0x150 fs/inode.c:1011 super_cache_scan+0x3ac/0x5c0 fs/super.c:240 do_shrink_slab+0x416/0x1200 mm/shrinker.c:443 shrink_slab_memcg mm/shrinker.c:560 [inline] shrink_slab+0xa82/0x12e0 mm/shrinker.c:638 shrink_one+0x398/0x850 mm/vmscan.c:5119 shrink_many mm/vmscan.c:5180 [inline] lru_gen_shrink_node mm/vmscan.c:5258 [inline] shrink_node+0x2b20/0x4320 mm/vmscan.c:6247 kswapd_shrink_node mm/vmscan.c:7101 [inline] balance_pgdat+0xb20/0x1f00 mm/vmscan.c:7279 kswapd+0x556/0xb50 mm/vmscan.c:7555 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(fs_reclaim); lock(&f->sem); lock(fs_reclaim); lock(&f->sem); *** DEADLOCK *** locks held by kswapd0/113: 2, last CPU#2: #0: ffffffff8efc9a20 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat+0xbce/0x1f00 mm/vmscan.c:7292 #1: ffff88804b2a40e8 (&type->s_umount_key#57){++++}-{4:4}, at: super_trylock_shared fs/super.c:688 [inline] #1: ffff88804b2a40e8 (&type->s_umount_key#57){++++}-{4:4}, at: super_cache_scan+0x9b/0x5c0 fs/super.c:213 stack backtrace: CPU: 2 UID: 0 PID: 113 Comm: kswapd0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_circular_bug.cold+0x178/0x1be kernel/locking/lockdep.c:2087 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2219 check_prev_add+0xeb/0xe60 kernel/locking/lockdep.c:3209 check_prevs_add kernel/locking/lockdep.c:3328 [inline] validate_chain kernel/locking/lockdep.c:3952 [inline] __lock_acquire+0x1528/0x1f40 kernel/locking/lockdep.c:5288 lock_acquire kernel/locking/lockdep.c:5942 [inline] lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899 __mutex_lock_common kernel/locking/mutex.c:646 [inline] __mutex_lock+0x1a4/0x1bd0 kernel/locking/mutex.c:821 jffs2_do_clear_inode+0x5a/0x470 fs/jffs2/readinode.c:1419 evict+0x3c2/0xad0 fs/inode.c:822 dispose_list+0x117/0x1e0 fs/inode.c:864 prune_icache_sb+0xea/0x150 fs/inode.c:1011 super_cache_scan+0x3ac/0x5c0 fs/super.c:240 do_shrink_slab+0x416/0x1200 mm/shrinker.c:443 shrink_slab_memcg mm/shrinker.c:560 [inline] shrink_slab+0xa82/0x12e0 mm/shrinker.c:638 shrink_one+0x398/0x850 mm/vmscan.c:5119 shrink_many mm/vmscan.c:5180 [inline] lru_gen_shrink_node mm/vmscan.c:5258 [inline] shrink_node+0x2b20/0x4320 mm/vmscan.c:6247 kswapd_shrink_node mm/vmscan.c:7101 [inline] balance_pgdat+0xb20/0x1f00 mm/vmscan.c:7279 kswapd+0x556/0xb50 mm/vmscan.c:7555 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Tested on: commit: 50d05c7c Merge tag 'landlock-7.3-rc3' of git://git.ker.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=150621f9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=85bc5cc2fc7394d9 dashboard link: https://syzkaller.appspot.com/bug?extid=743079a09058321247d8 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 userspace arch: i386 patch: https://syzkaller.appspot.com/x/patch.diff?x=11ac8905580000