From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f78.google.com (mail-io1-f78.google.com [209.85.166.78]) (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 E64A81DF97F for ; Sun, 10 Aug 2025 21:55:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754862925; cv=none; b=NP9mzOQPqQg4xn8xxQxGzNggfTqN/Ni6RbbrJwtsVB53qwx5f2jzJzBSiAQvo2BElqEcobT4YlhpOAk/v2j28YsMTGHAwz4MHuxy6HDkZkZaTVaFThQh9wX5CYOdbHR1QS75ByetZuEPmUoYkKmqWuNTaiCWkgDmR62BF99iV0o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754862925; c=relaxed/simple; bh=MRCBh/xh8E0qzjwuodnKjP/03LZyIWVca2FSuTLy79A=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=bTSqtTV6cX18268J9ZdnCMw24MgbcqbJlABwlZY77uB92Nv9CwlFSnSvX1z5YW9ukk/GweTmArU2Ny39xVheJuZM4F9cBEbjuwkp1wqOd6R2YDiG/fPcnLxyvMqpafIHH+JypkDg6oyWFJ12TyRES8biuDnW9ed35ns5RHj7f0I= 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=209.85.166.78 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-io1-f78.google.com with SMTP id ca18e2360f4ac-881a05b0846so355964139f.1 for ; Sun, 10 Aug 2025 14:55:23 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754862923; x=1755467723; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=wv9bFpMiDccCulrRjZHbJGrbhfdSTv5fYiCRt2bjYBc=; b=nTnAnuBSEq0WuBUp7ZwYmL5pNK0ArFVECctuSgldkI5hTWFA6aD0u4a0uwz0xM82m1 z3z+xzjeuJkWO5Zfn/s5cqv5w5qEkwKioMGhpF/drMpLW2CmjMDswmtmNlcp7xOGcZfB xoq0BBxXYSA5oX/KmnYWB7N9t9ZC6G9oEEAXINEHSGLMwxxjJaGxtqey+yzxCq+uS+dV NUeEWWirINObtZyPcByYXrgI5zVtuNKeEm/HmPKDXXlrxRz+iJZ2JXwjST7ELH5xy/IF JM+AjwKqpoMNUITnQdWXrQrrFxJ7pANK01swZPeLaQHRnB6inXg2tniSzSvV/23mhDEj Vsng== X-Forwarded-Encrypted: i=1; AJvYcCWDTF2AgEDO+tvDyagFfKZ7HGw3hwfgu40m4JGdqd8aSMu5qeeNaNx38NZJ6cygO2CMujln1gjlId6Cmw==@vger.kernel.org X-Gm-Message-State: AOJu0Yw5G5MQERVssnNO1l2rGaz5t+EEuo8SdKbxCcJG8zDnge8nwC+S iZDaG7v+02UGELYphuqQrFomJoFJaMFWfreHlwDDpwGis4Gjz0Sxj2YGZnYGexHK7x6IgTovdeO aXRAn7EiVWXf/Y6/pGCpe8vOqRDeHiE7OyJTqN5WV6dOPNvzyazBZQL7vfMA= X-Google-Smtp-Source: AGHT+IEs6Btxh1vuctiQqLY9I2Z3E5GBI6RjaU14aBZITv7nPo6FvT96/FWgmaQqqk/JTtAu4jPDh49Sa24bRk/gcRXHcE/NKYML Precedence: bulk X-Mailing-List: linux-btrfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:4a06:b0:87c:1d65:3aeb with SMTP id ca18e2360f4ac-883f11c040dmr1841176739f.2.1754862923026; Sun, 10 Aug 2025 14:55:23 -0700 (PDT) Date: Sun, 10 Aug 2025 14:55:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6899154b.050a0220.51d73.0094.GAE@google.com> Subject: [syzbot] [btrfs?] INFO: task hung in __alloc_workqueue (2) From: syzbot To: anna-maria@linutronix.de, clm@fb.com, dsterba@suse.com, frederic@kernel.org, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 479058002c32 Merge tag 'ata-6.17-rc1-fixes' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1315e042580000 kernel config: https://syzkaller.appspot.com/x/.config?x=943d6f7b1ddd8799 dashboard link: https://syzkaller.appspot.com/bug?extid=ead9101689c4ca30dbe8 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11d262f0580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7226b9adab95/disk-47905800.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b10c6c12e41f/vmlinux-47905800.xz kernel image: https://storage.googleapis.com/syzbot-assets/7e99b92d1763/bzImage-47905800.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/1ca3e7130df3/mount_0.gz fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=17f2f6a2580000) IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ead9101689c4ca30dbe8@syzkaller.appspotmail.com INFO: task syz.1.170:8358 blocked for more than 143 seconds. Tainted: G W 6.16.0-syzkaller-11852-g479058002c32 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.170 state:D stack:26024 pid:8358 tgid:8358 ppid:6003 task_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5357 [inline] __schedule+0x16f3/0x4c20 kernel/sched/core.c:6961 __schedule_loop kernel/sched/core.c:7043 [inline] schedule+0x165/0x360 kernel/sched/core.c:7058 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common kernel/sched/completion.c:121 [inline] wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion+0x2bf/0x5d0 kernel/sched/completion.c:153 kthread_flush_worker+0x1c6/0x240 kernel/kthread.c:1563 __alloc_workqueue+0x146b/0x1b70 kernel/workqueue.c:5763 alloc_workqueue_noprof+0xd4/0x210 kernel/workqueue.c:5786 btrfs_init_workqueues+0x42c/0x6c0 fs/btrfs/disk-io.c:2000 open_ctree+0x11ef/0x3a10 fs/btrfs/disk-io.c:3424 btrfs_fill_super fs/btrfs/super.c:977 [inline] btrfs_get_tree_super fs/btrfs/super.c:1937 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2074 [inline] btrfs_get_tree+0xf55/0x1820 fs/btrfs/super.c:2108 vfs_get_tree+0x92/0x2b0 fs/super.c:1815 do_new_mount+0x2a2/0x9e0 fs/namespace.c:3805 do_mount fs/namespace.c:4133 [inline] __do_sys_mount fs/namespace.c:4344 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4321 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb27169038a RSP: 002b:00007ffefe6fdaf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffefe6fdb80 RCX: 00007fb27169038a RDX: 00002000000055c0 RSI: 0000200000000200 RDI: 00007ffefe6fdb40 RBP: 00002000000055c0 R08: 00007ffefe6fdb80 R09: 000000000300000a R10: 000000000300000a R11: 0000000000000246 R12: 0000200000000200 R13: 00007ffefe6fdb40 R14: 00000000000055a3 R15: 0000200000000080 Showing all locks held in the system: 1 lock held by khungtaskd/38: #0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 1 lock held by udevd/5207: #0: ffff8880358bfa18 (&ep->lock){++++}-{3:3}, at: write_lock_irq include/linux/rwlock_rt.h:104 [inline] #0: ffff8880358bfa18 (&ep->lock){++++}-{3:3}, at: ep_poll fs/eventpoll.c:2127 [inline] #0: ffff8880358bfa18 (&ep->lock){++++}-{3:3}, at: do_epoll_wait+0x84d/0xbb0 fs/eventpoll.c:2560 2 locks held by getty/5598: #0: ffff88823bfae8a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x444/0x1410 drivers/tty/n_tty.c:2222 3 locks held by kworker/u8:3/5911: 3 locks held by kworker/u8:7/5942: 6 locks held by udevd/6060: 1 lock held by udevd/6069: 1 lock held by udevd/6190: 6 locks held by udevd/6237: #0: ffff88802205eea8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:884 [inline] #0: ffff88802205eea8 (&sb->s_type->i_mutex_key#7){++++}-{4:4}, at: blkdev_read_iter+0x2ff/0x440 block/fops.c:848 #1: ffff88803b280250 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:472 [inline] #1: ffff88803b280250 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:277 [inline] #1: ffff88803b280250 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:337 #2: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #2: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: ___pte_offset_map+0x29/0x200 mm/pgtable-generic.c:286 #3: ffff888026394c58 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] #3: ffff888026394c58 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0x13e/0x210 mm/pgtable-generic.c:401 #4: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #4: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #4: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: __rt_spin_lock kernel/locking/spinlock_rt.c:50 [inline] #4: ffffffff8d9a8b80 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1bb/0x2c0 kernel/locking/spinlock_rt.c:57 #5: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] #5: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x170/0x540 mm/swap.c:-1 2 locks held by kworker/u8:9/6857: 1 lock held by syz.1.170/8358: #0: ffff88802315a0d0 (&type->s_umount_key#53/1){+.+.}-{4:4}, at: alloc_super+0x204/0x990 fs/super.c:345 4 locks held by kworker/u8:11/10100: 1 lock held by syz.3.381/11502: 2 locks held by syz.4.382/11516: #0: ffff88805e1a80d0 (&type->s_umount_key#53/1){+.+.}-{4:4}, at: alloc_super+0x204/0x990 fs/super.c:345 #1: ffffffff8d611078 (bit_wait_table + i){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] #1: ffffffff8d611078 (bit_wait_table + i){+.+.}-{3:3}, at: finish_wait kernel/sched/wait.c:394 [inline] #1: ffffffff8d611078 (bit_wait_table + i){+.+.}-{3:3}, at: __wait_on_bit+0x1ff/0x300 kernel/sched/wait_bit.c:55 3 locks held by syz.0.383/11517: #0: ffff88801aa94488 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3107 [inline] #0: ffff88801aa94488 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x217/0xaa0 fs/read_write.c:682 #1: ffff888054b3c598 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #1: ffff888054b3c598 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x82/0x120 mm/shmem.c:3518 #2: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] #2: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x170/0x540 mm/swap.c:-1 3 locks held by syz.5.384/11518: #0: ffff88801aa94488 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3107 [inline] #0: ffff88801aa94488 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x217/0xaa0 fs/read_write.c:682 #1: ffff8880254a6e88 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:869 [inline] #1: ffff8880254a6e88 (&sb->s_type->i_mutex_key#12){+.+.}-{4:4}, at: shmem_file_write_iter+0x82/0x120 mm/shmem.c:3518 #2: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:44 [inline] #2: ffff8880b8833490 ((lock)#2){+.+.}-{3:3}, at: __folio_batch_add_and_move+0x170/0x540 mm/swap.c:-1 7 locks held by syz.2.385/11535: 1 lock held by udevadm/11536: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Tainted: G W 6.16.0-syzkaller-11852-g479058002c32 #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline] watchdog+0xf93/0xfe0 kernel/hung_task.c:491 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 5911 Comm: kworker/u8:3 Tainted: G W 6.16.0-syzkaller-11852-g479058002c32 #0 PREEMPT_{RT,(full)} Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:get_timer_this_cpu_base kernel/time/timer.c:939 [inline] RIP: 0010:__mod_timer+0x81c/0xf60 kernel/time/timer.c:1101 Code: 01 00 00 00 48 8b 5c 24 20 41 0f b6 44 2d 00 84 c0 0f 85 72 06 00 00 8b 2b e8 f0 bb 49 09 41 89 c5 89 c3 bf 08 00 00 00 89 c6 0f c1 12 00 41 83 fd 07 44 89 34 24 0f 87 69 06 00 00 e8 4c bc RSP: 0018:ffffc90004fff680 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 0000000000000000 RCX: f9fab87ca5ec6a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000200000 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff520009ffeac R12: ffff8880b8825a80 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000802 FS: 0000000000000000(0000) GS:ffff8881268cd000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f46b6524000 CR3: 000000003afb2000 CR4: 00000000003526f0 Call Trace: queue_delayed_work_on+0x18b/0x280 kernel/workqueue.c:2559 queue_delayed_work include/linux/workqueue.h:684 [inline] batadv_forw_packet_queue+0x239/0x2a0 net/batman-adv/send.c:691 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:842 [inline] batadv_iv_ogm_schedule+0x892/0xf00 net/batman-adv/bat_iv_ogm.c:874 batadv_iv_send_outstanding_bat_ogm_packet+0x6c6/0x7e0 net/batman-adv/bat_iv_ogm.c:1714 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup