From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f71.google.com (mail-ot1-f71.google.com [209.85.210.71]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 156982D662F for ; Tue, 28 Apr 2026 03:05:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777345506; cv=none; b=TsMivCRomYouX70HRNHRA1u853FxxmcbvlPd+ZTseai0ufMWlr7qewnxAZK3YSNSEi2h3VHDX1JO7X1+1Y6tNSv6kxxrry+b6fEEUw61Rrsb2ccRO530uNPyqh4qCizsTVNbxxoKvhBi45hdrdgFys8Qzh4nZWzupV1NX39T4aU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777345506; c=relaxed/simple; bh=MgRNdBzoP8fuN0Pb8WyIHMwvGmk6AVFapZXOhkAKrmI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=J/5DQ4lK584ErgHd7kZSImLqaHiRnTTId1Q/1eHTWAgXOSnyywIDIiqIDUVmjCgkh9/uF2PZrlHQNtqvlj12otjZR0seqSC7M08BN8xXJey8q3pv9H6yYv9OkYpM84ReWHyuJ7XaqWFc9Q841wwUoNBoNxOR/SGuT7TId+Kc6H8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.210.71 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-ot1-f71.google.com with SMTP id 46e09a7af769-7d4c7afa9e0so17833049a34.0 for ; Mon, 27 Apr 2026 20:05:04 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777345504; x=1777950304; h=to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=ontcwRSzsfUs9+hrzCVx6gXV7+P1ps5IIjzAwbavutA=; b=BSCnwirUW77yfR8cjyNtpiEK7Ft+BbTpstxVQaI1jqTYm4vQLFGJCkpkwH2CGeAEFz RRhq/zdhvRV+qrcBFfEjrYIXh6/rQFO8aqa3hnjDyFwtRfsjEFI5TbGCapecNptEeI+G zYgQShf4VmaSXslskdICfTTebsWD9rmXO/Ns2hVaw1cpjBNRGh1Rl1OiZDayweW3VA0B ug1/9oqV50n45c1crGllJi6kZUTX5puz1PRk6Tv9TVUdnxrm2fm5cVAO2+D5RDAzRiSx ciKaqFWA9ZuHM7i/4eSzt9nn/+cf3Ur3FjK4OYeucL3AQZZI75SuhkdhALB7+Y3R99rR AOlw== X-Forwarded-Encrypted: i=1; AFNElJ8yPCiIWigRf7Jw9cRp5yocgvH/qjiMFNSUJkuRc1MLY2EoKd8Ii4/7zaKYttWMH1MdVEe2RxomLtI8I8I=@vger.kernel.org X-Gm-Message-State: AOJu0Ywk6KpgrQd7xAPSsQByxtDFkb3EEuoVmya5nbmVQuRABX/imDwI fm+G79UA12i/k7XDwqgyFgf4yUtNGkFP8l40Wm7TWuxgGIUFhOhZpowhm3AOjZA2G1eytRKG3iw GEiZePcwJjGSHmRnAZLuXbeVDrkvhLjbmltiLmFmFhzpp36ZdvRrzxr7ZWqw= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1844:b0:696:1cbd:27ac with SMTP id 006d021491bc7-6965cb83ebamr621622eaf.49.1777345504178; Mon, 27 Apr 2026 20:05:04 -0700 (PDT) Date: Mon, 27 Apr 2026 20:05:04 -0700 In-Reply-To: <20260427234728.81020-1-kartikey406@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69f023e0.050a0220.1d2f3.0001.GAE@google.com> Subject: Re: [syzbot] [nilfs?] INFO: task hung in nilfs_transaction_begin (2) From: syzbot To: kartikey406@gmail.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: INFO: task hung in nilfs_transaction_begin INFO: task syz.0.17:6369 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.17 state:D stack:26072 pid:6369 tgid:6366 ppid:6267 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x17b4/0x5680 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x164/0x360 kernel/sched/core.c:7282 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7339 rwsem_down_read_slowpath+0x6d9/0x940 kernel/locking/rwsem.c:1114 __down_read_common kernel/locking/rwsem.c:1291 [inline] __down_read kernel/locking/rwsem.c:1304 [inline] down_read+0x99/0x2e0 kernel/locking/rwsem.c:1570 nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221 nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921 notify_change+0xc1a/0xf40 fs/attr.c:556 chmod_common+0x273/0x4a0 fs/open.c:637 do_fchmodat+0x12d/0x230 fs/open.c:682 __do_sys_fchmodat fs/open.c:701 [inline] __se_sys_fchmodat fs/open.c:698 [inline] __x64_sys_fchmodat+0x7d/0x90 fs/open.c:698 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5998f9cdd9 RSP: 002b:00007f5999d84028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007f5999216090 RCX: 00007f5998f9cdd9 RDX: 000000000000017f RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007f5999032d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f5999216128 R14: 00007f5999216090 R15: 00007ffdbc74df58 INFO: task syz.1.18:6408 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.18 state:D stack:26072 pid:6408 tgid:6405 ppid:6371 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5387 [inline] __schedule+0x17b4/0x5680 kernel/sched/core.c:7188 __schedule_loop kernel/sched/core.c:7267 [inline] schedule+0x164/0x360 kernel/sched/core.c:7282 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7339 rwsem_down_read_slowpath+0x6d9/0x940 kernel/locking/rwsem.c:1114 __down_read_common kernel/locking/rwsem.c:1291 [inline] __down_read kernel/locking/rwsem.c:1304 [inline] down_read+0x99/0x2e0 kernel/locking/rwsem.c:1570 nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221 nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921 notify_change+0xc1a/0xf40 fs/attr.c:556 chmod_common+0x273/0x4a0 fs/open.c:637 do_fchmodat+0x12d/0x230 fs/open.c:682 __do_sys_fchmodat fs/open.c:701 [inline] __se_sys_fchmodat fs/open.c:698 [inline] __x64_sys_fchmodat+0x7d/0x90 fs/open.c:698 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbc13b9cdd9 RSP: 002b:00007fbc14a1b028 EFLAGS: 00000246 ORIG_RAX: 000000000000010c RAX: ffffffffffffffda RBX: 00007fbc13e16090 RCX: 00007fbc13b9cdd9 RDX: 000000000000017f RSI: 0000200000000300 RDI: ffffffffffffff9c RBP: 00007fbc13c32d69 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fbc13e16128 R14: 00007fbc13e16090 R15: 00007ffcbf037038 Showing all locks held in the system: 5 locks held by kworker/u8:1/13: #0: ffff8880b863aea0 ( &rq->__lock ){-.-.}-{2:2} , at: raw_spin_rq_lock_nested+0x31/0x150 kernel/sched/core.c:652 #1: ffff8880b8624588 ( psi_seq ){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffff8880b8626118 (&base->lock){-.-.}-{2:2}, at: lock_timer_base kernel/time/timer.c:1004 [inline] #2: ffff8880b8626118 (&base->lock){-.-.}-{2:2}, at: __mod_timer+0x1ae/0xf30 kernel/time/timer.c:1085 #3: ffffffff9a6630d8 ( &obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_activate+0x83/0x580 lib/debugobjects.c:835 #4: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] #4: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #4: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1181 [inline] #4: ffffffff8e95cd60 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa6/0x2550 arch/x86/kernel/unwind_orc.c:495 1 lock held by khungtaskd/32: #0: ffffffff8e95cd60 ( rcu_read_lock ){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline] ){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] ){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 4 locks held by kworker/u8:3/49: #0: ffff88813fe7c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline] #0: ffff88813fe7c140 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385 #1: ffffc90000b97c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline] #1: ffffc90000b97c40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385 #2: ffffffff8fdceac0 (rtnl_mutex){+.+.}-{4:4} , at: linkwatch_event+0xe/0x60 net/core/link_watch.c:313 #3: ffffffff8e963068 ( rcu_state.exp_mutex ){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] ){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961 2 locks held by getty/5374: #0: ffff8880369100a0 ( &tty->ldisc_sem ){++++}-{0:0} , at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000322b2e8 ( &ldata->atomic_read_lock ){+.+.}-{4:4} , at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 2 locks held by syz.0.17/6367: 4 locks held by syz.0.17/6369: #0: ffff8880793ac410 ( sb_writers #12 ){.+.+}-{0:0} , at: mnt_want_write+0x41/0x90 fs/namespace.c:493 #1: ffff88806a8f9af0 ( &type->i_mutex_dir_key #8 ){++++}-{4:4}, at: inode_lock_killable include/linux/fs.h:1034 [inline] ){++++}-{4:4}, at: chmod_common+0x191/0x4a0 fs/open.c:629 #2: ffff8880793ac600 (sb_internal#2){.+.+}-{0:0}, at: nilfs_setattr+0x124/0x2c0 fs/nilfs2/inode.c:921 #3: ffff88807c577288 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221 3 locks held by syz.1.18/6406: 4 locks held by syz.1.18/6408: #0: ffff888033ae0410 ( sb_writers #12){.+.+}-{0:0} , at: mnt_want_write+0x41/0x90 fs/namespace.c:493 Tested on: commit: 3b3bea6d Merge tag 'cgroup-for-7.1-rc1-fixes' of git:/.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=175d9348580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4caf64b1ee83dac0 dashboard link: https://syzkaller.appspot.com/bug?extid=62f0f99d2f2bb8e3bbd7 compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=169f5ace580000