From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-ot1-f69.google.com (mail-ot1-f69.google.com [209.85.210.69]) (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 A1DE4392C50 for ; Mon, 13 Apr 2026 06:38:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776062284; cv=none; b=k+qpH3f2EhtnAP/BOivT4VTydyZJDwEqZgPRpK9o0HSu8c8G6EZSYQlw2xcHLj1Own2DsP5GcHUXXQUqXY6pgOcPRDJ6NtKn4NM827yHrQb/NsLNA9aSWbFIbUkCj48dhsxrqC1yf5Xu3/kqM+871O0tdPB+EtExzzltVBFDls0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776062284; c=relaxed/simple; bh=UwJ48Z5dSr8c3dVmLHzxwXB4J++HSR4v2jWSthikYKA=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=X197C5vmV2YPK2WjQC2GdHrLBkfO41CupueKbqRGfZQUUDvOmzbDrB8XR8wvajiIo8ccNGGRkXtjVExGy1VWwdPkhq7KwxzxW0cQi9ztfvBQ5ZTAbIIWJHgeXx1uzDDItB28Lmoi9fXwdd9bc8IdsuoavhvaGFU3ITElnRABIo0= 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=209.85.210.69 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-f69.google.com with SMTP id 46e09a7af769-7dbc56f5290so8612216a34.0 for ; Sun, 12 Apr 2026 23:38:02 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1776062281; x=1776667081; 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=4LkerVcEwD/1ghtolbBLoFJMbcKYdsnCXStD1RKzS1s=; b=Owpqte7hYdBCSJ7x82AokPWZgyOh5s7/9cCP/fZzKmlnJ1kJVok3GfD6K6fjE1CTdD cFpKIZ9oJMu8WmzWZOq1uZqNYfTMtl3E2WAgQeQ5SvUI/nlhgYz4ayK8el8/7IZDoIp/ BfMtLduD0p04VkV3p+KWm/gX3kiH1qSCA1rt+ZWHmsApkIhg+tmmZ4e35frsHZqeT/Bm fs3xfBS+ir+A9CE4PEvH4y1wYFVceLvZiD+qCGGRmgrRReZhJTDMKslEjdeyU3hPIoiN WUKlJhjbvafr6qyrtvfjyiQPWdkmOdHCYLXjwvvNeZ54Ng26x6YEda9Le0T/aVJzcLgP Syog== X-Gm-Message-State: AOJu0YxShPbwMxrphhw0uTSsTKGlLYJc/YqeGbUrRJrypRC6XR2Q0cTK VnSJbMOaVoZoY514Qpc0jPQpF6ThK7lbVKOfhnSDNydJWKiUslhRDTPHf78tD4yVoH244tHkxGZ 6WXJMXwlqLyFFFjYXH3TiItSurLw/z76fI6LsRpjRQFoUfvkgEZ7giuTfEhc= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1606:b0:67e:4140:769a with SMTP id 006d021491bc7-68be5c5e82amr6121097eaf.7.1776062281591; Sun, 12 Apr 2026 23:38:01 -0700 (PDT) Date: Sun, 12 Apr 2026 23:38:01 -0700 In-Reply-To: <20260413061917.18327-2-ytohnuki@amazon.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69dc8f49.050a0220.3030df.0046.GAE@google.com> Subject: Re: [syzbot] [xfs?] INFO: task hung in xlog_force_lsn (2) From: syzbot To: linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org, syzkaller-bugs@googlegroups.com, ytohnuki@amazon.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 xfs_buf_item_unpin INFO: task kworker/u8:0:12 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:0 state:D stack:20896 pid:12 tgid:12 ppid:2 task_flags:0x4248060 flags:0x00080000 Workqueue: xfs-cil/loop1 xlog_cil_push_work Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x1553/0x5190 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75 ___down_common kernel/locking/semaphore.c:268 [inline] __down_common+0x321/0x730 kernel/locking/semaphore.c:293 down+0x80/0xd0 kernel/locking/semaphore.c:100 xfs_buf_lock+0x14d/0x520 fs/xfs/xfs_buf.c:993 xfs_buf_item_unpin+0x1c4/0x770 fs/xfs/xfs_buf_item.c:551 xlog_cil_ail_insert fs/xfs/xfs_log_cil.c:-1 [inline] xlog_cil_committed+0x9f4/0x1170 fs/xfs/xfs_log_cil.c:995 xlog_cil_push_work+0x1e0c/0x23d0 fs/xfs/xfs_log_cil.c:1607 process_one_work kernel/workqueue.c:3288 [inline] process_scheduled_works+0xb6e/0x18c0 kernel/workqueue.c:3371 worker_thread+0x8a2/0xda0 kernel/workqueue.c:3452 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 INFO: task syz.1.22:6678 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.1.22 state:D stack:25536 pid:6678 tgid:6675 ppid:6316 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5298 [inline] __schedule+0x1553/0x5190 kernel/sched/core.c:6911 __schedule_loop kernel/sched/core.c:6993 [inline] schedule+0x164/0x360 kernel/sched/core.c:7008 schedule_timeout+0xc3/0x2c0 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+0x2cc/0x5e0 kernel/sched/completion.c:153 __flush_workqueue+0x6f6/0x14f0 kernel/workqueue.c:4096 xlog_cil_push_now fs/xfs/xfs_log_cil.c:1725 [inline] xlog_cil_force_seq+0x228/0x8c0 fs/xfs/xfs_log_cil.c:1927 xfs_log_force_seq+0x196/0x440 fs/xfs/xfs_log.c:3000 __xfs_trans_commit+0x7d3/0xc20 fs/xfs/xfs_trans.c:877 xfs_trans_commit+0x13e/0x1c0 fs/xfs/xfs_trans.c:926 xfs_sync_sb_buf+0x13f/0x230 fs/xfs/libxfs/xfs_sb.c:1490 xfs_ioc_setlabel+0x1de/0x340 fs/xfs/xfs_ioctl.c:1041 xfs_file_ioctl+0x9c5/0x1710 fs/xfs/xfs_ioctl.c:1198 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f73218ba539 RSP: 002b:00007f7320f1e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7321b25fa0 RCX: 00007f73218ba539 RDX: 00002000000001c0 RSI: 0000000041009432 RDI: 0000000000000004 RBP: 00007f732194dee0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7321b26038 R14: 00007f7321b25fa0 R15: 00007ffded160d28 Showing all locks held in the system: 2 locks held by kworker/u8:0/12: #0: ffff88803de1e138 ((wq_completion)xfs-cil/loop1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803de1e138 ((wq_completion)xfs-cil/loop1){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90000117c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90000117c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 1 lock held by khungtaskd/38: #0: ffffffff8dbb20c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8dbb20c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8dbb20c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u9:0/60: #0: ffff888028c92138 ((wq_completion)hci7){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff888028c92138 ((wq_completion)hci7){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc9000126fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc9000126fc40 ((work_completion)(&hdev->cmd_sync_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 #2: ffff8880310bcf80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_cmd_sync_work+0x1d3/0x400 net/bluetooth/hci_sync.c:331 2 locks held by kworker/u8:4/67: #0: ffff88813fe6c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88813fe6c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc9000153fc40 ((reaper_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc9000153fc40 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 2 locks held by kworker/u8:6/140: #0: ffff88803a6cc138 ((wq_completion)xfs-cil/loop4#36){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803a6cc138 ((wq_completion)xfs-cil/loop4#36){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90003aa7c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90003aa7c40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 2 locks held by kworker/1:2/805: #0: ffff88802558a538 ((wq_completion)xfs-sync/loop1){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88802558a538 ((wq_completion)xfs-sync/loop1){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90005107c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90005107c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 2 locks held by kworker/u8:8/1054: #0: ffff88803583d138 ((wq_completion)xfs-cil/loop3#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803583d138 ((wq_completion)xfs-cil/loop3#2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90005edfc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90005edfc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 3 locks held by kworker/u8:10/1400: #0: ffff88803478a138 ((wq_completion)loop8){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803478a138 ((wq_completion)loop8){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90006c0fc40 ((work_completion)(&lo->rootcg_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90006c0fc40 ((work_completion)(&lo->rootcg_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 #2: ffff888025b90160 (&lo->lo_work_lock){+.+.}-{3:3}, at: spin_lock_irq include/linux/spinlock_rt.h:96 [inline] #2: ffff888025b90160 (&lo->lo_work_lock){+.+.}-{3:3}, at: loop_process_work+0x125/0x11b0 drivers/block/loop.c:1953 2 locks held by kworker/u8:12/1431: #0: ffff88813fe6c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88813fe6c138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90006b0fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90006b0fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 2 locks held by kworker/u8:14/4094: #0: ffff88803ac6a138 ((wq_completion)xfs-cil/loop2#4){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803ac6a138 ((wq_completion)xfs-cil/loop2#4){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc900107bfc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc900107bfc40 ((work_completion)(&ctx->push_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 1 lock held by udevd/5162: 2 locks held by getty/5551: #0: ffff8880370870a0 (&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+0x462/0x13c0 drivers/tty/n_tty.c:2211 1 lock held by udevd/6362: #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline] #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: get_partial_node_bulk mm/slub.c:3750 [inline] #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: __refill_objects_node+0x87/0x560 mm/slub.c:7027 2 locks held by kworker/1:6/6523: #0: ffff8880376a0938 ((wq_completion)xfs-sync/loop4#37){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff8880376a0938 ((wq_completion)xfs-sync/loop4#37){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90004f07c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90004f07c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 2 locks held by kworker/1:7/6527: #0: ffff8880296d4d38 ((wq_completion)xfs-sync/loop3){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff8880296d4d38 ((wq_completion)xfs-sync/loop3){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc90004f27c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc90004f27c40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 1 lock held by udevd/6623: #0: ffff88802205be30 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1043 [inline] #0: ffff88802205be30 (&sb->s_type->i_mutex_key#9){++++}-{4:4}, at: blkdev_read_iter+0x2ff/0x440 block/fops.c:854 1 lock held by udevd/6644: 5 locks held by udevd/6645: 2 locks held by kworker/0:6/6670: #0: ffff88803b9f1d38 ((wq_completion)xfs-sync/loop2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3263 [inline] #0: ffff88803b9f1d38 ((wq_completion)xfs-sync/loop2){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0 kernel/workqueue.c:3371 #1: ffffc900015cfc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3264 [inline] #1: ffffc900015cfc40 ((work_completion)(&(&log->l_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0 kernel/workqueue.c:3371 1 lock held by syz.1.22/6678: #0: ffff888036b5c480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:537 1 lock held by syz.3.32/6804: #0: ffff8880247ec480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:537 1 lock held by syz.2.37/6884: #0: ffff8880288bc480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:537 1 lock held by syz.4.146/8193: #0: ffff888034c2a480 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x63/0x210 fs/namespace.c:537 1 lock held by syz-executor/8516: #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: spin_lock include/linux/spinlock_rt.h:45 [inline] #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: get_partial_node_bulk mm/slub.c:3750 [inline] #0: ffff88801b2c5a58 (&n->list_lock){+.+.}-{3:3}, at: __refill_objects_node+0x87/0x560 mm/slub.c:7027 1 lock held by syz.5.318/10004: #0: ffff88803c46c0d0 (&type->s_umount_key#55/1){+.+.}-{4:4}, at: alloc_super+0x28c/0xac0 fs/super.c:345 2 locks held by syz.6.319/10016: 2 locks held by syz.0.320/10018: 2 locks held by syz.7.321/10020: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:161 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:346 [inline] watchdog+0xfd9/0x1030 kernel/hung_task.c:515 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 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: 6644 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)} Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:spin_lock include/linux/spinlock_rt.h:45 [inline] RIP: 0010:__slab_free+0xe6/0x2a0 mm/slub.c:5519 Code: f0 49 0f c7 4e 20 0f 84 cd 00 00 00 48 89 44 24 40 48 89 54 24 48 e9 ac 00 00 00 49 8b 06 48 c1 e8 3a 4c 8b ac c3 c8 00 00 00 <4c> 89 ef e8 b2 9b f0 08 4d 8b 26 41 c1 ec 09 41 83 e4 01 f6 43 0a RSP: 0018:ffffc900051978b0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff88801b2c8280 RCX: 0000000000120011 RDX: ffff88805d4e99c8 RSI: ffff88805d4e99c8 RDI: ffff88801b2c8280 RBP: ffffc90005197938 R08: 0000000000000001 R09: ffffffff8227effc R10: dffffc0000000000 R11: fffffbfff1e7e917 R12: 0000000000000000 R13: ffff88801b2c5b00 R14: ffffea0001753a00 R15: 0000000000000000 FS: 00007fe1d410f880(0000) GS:ffff88812660f000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe1d37bb000 CR3: 0000000035e24000 CR4: 00000000003526f0 Call Trace: qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4538 [inline] slab_alloc_node mm/slub.c:4866 [inline] __do_kmalloc_node mm/slub.c:5259 [inline] __kmalloc_noprof+0x399/0x7b0 mm/slub.c:5272 kmalloc_noprof include/linux/slab.h:954 [inline] tomoyo_realpath_from_path+0xe3/0x5d0 security/tomoyo/realpath.c:251 tomoyo_get_realpath security/tomoyo/file.c:151 [inline] tomoyo_path_perm+0x283/0x560 security/tomoyo/file.c:827 security_inode_getattr+0x12b/0x310 security/security.c:1870 vfs_getattr fs/stat.c:259 [inline] vfs_fstat fs/stat.c:281 [inline] __do_sys_newfstat fs/stat.c:551 [inline] __se_sys_newfstat fs/stat.c:546 [inline] __x64_sys_newfstat+0x13b/0x270 fs/stat.c:546 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe1d4267ad7 Code: 73 01 c3 48 8b 0d 21 f3 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 05 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 8b 15 f1 f2 0d 00 f7 d8 64 89 02 b8 RSP: 002b:00007ffd1c62b248 EFLAGS: 00000297 ORIG_RAX: 0000000000000005 RAX: ffffffffffffffda RBX: 000055d891db7280 RCX: 00007fe1d4267ad7 RDX: 00007fe1d4345ea0 RSI: 00007ffd1c62b250 RDI: 000000000000000b RBP: 00007fe1d4345ff0 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 000000000000000a R13: 0000000000003fff R14: 0000000000000000 R15: 000055d891db7280 Tested on: commit: 028ef9c9 Linux 7.0 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=125260ce580000 kernel config: https://syzkaller.appspot.com/x/.config?x=9800c931612cba58 dashboard link: https://syzkaller.appspot.com/bug?extid=c27dee924f3271489c82 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=1266d106580000