From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f207.google.com (mail-il1-f207.google.com [209.85.166.207]) (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 7391B946C for ; Sun, 6 Jul 2025 17:28:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751822914; cv=none; b=bNLKTjmggsie+cEPcrirqUtYa3IEuFGYWaK2GtLgDyAdEt4mDiRfcSwTnhORO+SfhisFZhO8zTVdGGIJcbZdlQeyFMWKm54rfLxWocmtvg+f4jeogHB7TlZ1HQwTTZWiLkmuBf339AhiC3jQz1Y0vhH2H1VWk4ma4VOfLMLdOzk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1751822914; c=relaxed/simple; bh=Q3bUQd1t4mluLUSGw7P9kDhCIOU4UhMx5uGfsM9jgUk=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=CzbU0wsK/treLB3z3XRsMzcthdD1PKC0grSyfE8dq3ApsBQ5xusdBLa6rzSvWvUAHUBecBOTTIc5531bh5lrvjXHHIQUClmUmPhF7fbHKd7Z1WbjhbU6mhfFOt4e+V1IVHL8eVR1KaNDctzpKSvawD6/KKx4qyijqPL0wZwG1FM= 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=209.85.166.207 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-il1-f207.google.com with SMTP id e9e14a558f8ab-3ddcc7e8266so31942425ab.0 for ; Sun, 06 Jul 2025 10:28:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751822911; x=1752427711; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=SA0KRF7Gm0oF5MNKAT+Ddz8GhM4arWtEZ2d06nst8yQ=; b=VETunPvJiw94s8LJnImdLC+DsAoQytlnV9nIZDJeWz+uVSbZd5qLH8QgQFgY8zYbY6 l4Q/nZTJdTRjT9OIv/H+uzc+n5Dd4HlhwgodrAfl+oiy1xTN88x478xwrPAQ3SA3r8Mx 6kW2N5GBX3nEoSWGa2IaDNya0z/1g74kmO+omJXwLxtznqanic+fD6U/udsnNTX3PrQK 3sOYIZ7CgFiXvUWtoNxnZF68bn+oMg1OZLrZvZjBurYPG5sYn1BA/wdSRkkJv7ycbc6e r6lWKCNjLw/vf1aAVOBrSvJSYxJ9gUleSgfLYgleti0JCGFJd4LCLs1VTjYODavzSa1v 7xeA== X-Forwarded-Encrypted: i=1; AJvYcCWuscMllmgnVBuxTC4I/PRjienHLxl72D58jet06U2JDOA2d2sh97QhYW9gcKTt8iVYua/iz9HuvL5JFkY=@vger.kernel.org X-Gm-Message-State: AOJu0YznkvmPDLdzQyrqZv+tdwIyuAV6ncDI4c3ZmgFGswZsrv6XYFuH TV4yVZ6wDIkArJJfdm8jX+I/Y1ttZuXevEuz2bgtbxZ104QWmlPSqVV8RVbTlWcvfCMhbyi23uZ kzijBKnyao7xUaCjIQd8wDL+jFmAVKr7Tuulo/C23PAxzIDl5nQlvNyw0wEA= X-Google-Smtp-Source: AGHT+IFRgmXf7+2+jbNqiRrRMdBbN7xg+/+5uSfIFtv7SviPlLzuzG/5+8cdmsN1DTl5DH7UtsuWYfoOMTF3OcXI7/ENHF0XMbky Precedence: bulk X-Mailing-List: linux-serial@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:85:b0:3dc:875e:ed8d with SMTP id e9e14a558f8ab-3e1347bc200mr97451205ab.4.1751822911599; Sun, 06 Jul 2025 10:28:31 -0700 (PDT) Date: Sun, 06 Jul 2025 10:28:31 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <686ab23f.a00a0220.c7b3.005f.GAE@google.com> Subject: [syzbot] [serial?] possible deadlock in get_partial_node (3) From: syzbot To: gregkh@linuxfoundation.org, jirislaby@kernel.org, linux-kernel@vger.kernel.org, linux-serial@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 50c8770a42fa Add linux-next specific files for 20250702 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=12e433d4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d831c9dfe03f77ec dashboard link: https://syzkaller.appspot.com/bug?extid=b02653606401c5d318a2 compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/eb40fda2e0ca/disk-50c8770a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cba4d214940c/vmlinux-50c8770a.xz kernel image: https://storage.googleapis.com/syzbot-assets/4b23ed647866/bzImage-50c8770a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b02653606401c5d318a2@syzkaller.appspotmail.com ============================================================================= ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc4-next-20250702-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor/5829 is trying to acquire lock: ffffffff8e130220 (console_owner){-.-.}-{0:0}, at: console_trylock_spinning kernel/printk/printk.c:2048 [inline] ffffffff8e130220 (console_owner){-.-.}-{0:0}, at: vprintk_emit+0x444/0x7a0 kernel/printk/printk.c:2449 but task is already holding lock: ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline] ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:5897 [inline] ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0xa9/0x250 mm/slub.c:5934 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&n->list_lock){-.-.}-{3:3}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 get_partial_node+0x37/0x390 mm/slub.c:2899 get_partial mm/slub.c:3013 [inline] ___slab_alloc+0xb3f/0x1410 mm/slub.c:3871 __slab_alloc mm/slub.c:3981 [inline] __slab_alloc_node mm/slub.c:4056 [inline] slab_alloc_node mm/slub.c:4217 [inline] __do_kmalloc_node mm/slub.c:4364 [inline] __kmalloc_noprof+0x305/0x4f0 mm/slub.c:4377 kmalloc_noprof include/linux/slab.h:909 [inline] tty_buffer_alloc drivers/tty/tty_buffer.c:180 [inline] __tty_buffer_request_room+0x1c8/0x520 drivers/tty/tty_buffer.c:273 __tty_insert_flip_string_flags+0xb8/0x430 drivers/tty/tty_buffer.c:309 tty_insert_flip_string_fixed_flag include/linux/tty_flip.h:35 [inline] tty_insert_flip_string include/linux/tty_flip.h:83 [inline] tty_insert_flip_string_and_push_buffer+0xa3/0x1f0 drivers/tty/tty_buffer.c:559 pty_write+0xa7/0xe0 drivers/tty/pty.c:118 tty_put_char+0x111/0x160 drivers/tty/tty_io.c:3154 __process_echoes+0x193/0xa20 drivers/tty/n_tty.c:708 flush_echoes drivers/tty/n_tty.c:791 [inline] __receive_buf drivers/tty/n_tty.c:1626 [inline] n_tty_receive_buf_common+0xc29/0x12f0 drivers/tty/n_tty.c:1723 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:37 receive_buf drivers/tty/tty_buffer.c:445 [inline] flush_to_ldisc+0x24a/0x720 drivers/tty/tty_buffer.c:495 process_one_work kernel/workqueue.c:3239 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3322 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3403 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&port->lock#2){-.-.}-{3:3}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 tty_port_tty_get drivers/tty/tty_port.c:307 [inline] tty_port_default_wakeup+0x21/0xf0 drivers/tty/tty_port.c:66 serial8250_tx_chars+0x72e/0x970 drivers/tty/serial/8250/8250_port.c:1728 serial8250_handle_irq+0x633/0xbb0 drivers/tty/serial/8250/8250_port.c:1836 serial8250_default_handle_irq+0xbf/0x1e0 drivers/tty/serial/8250/8250_port.c:1856 serial8250_interrupt+0x8d/0x160 drivers/tty/serial/8250/8250_core.c:82 __handle_irq_event_percpu+0x28c/0x980 kernel/irq/handle.c:158 handle_irq_event_percpu kernel/irq/handle.c:193 [inline] handle_irq_event+0x8b/0x1e0 kernel/irq/handle.c:210 handle_edge_irq+0x267/0x9c0 kernel/irq/chip.c:797 generic_handle_irq_desc include/linux/irqdesc.h:173 [inline] handle_irq arch/x86/kernel/irq.c:254 [inline] call_irq_handler arch/x86/kernel/irq.c:266 [inline] __common_interrupt+0x140/0x250 arch/x86/kernel/irq.c:292 common_interrupt+0xb6/0xe0 arch/x86/kernel/irq.c:285 asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:406 [inline] uart_port_unlock_irqrestore include/linux/serial_core.h:788 [inline] uart_port_unlock_deref+0x111/0x2f0 drivers/tty/serial/serial_core.c:91 uart_write+0xe8/0x130 drivers/tty/serial/serial_core.c:637 process_output_block drivers/tty/n_tty.c:561 [inline] n_tty_write+0xd35/0x11d0 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1006 [inline] file_tty_write+0x500/0x990 drivers/tty/tty_io.c:1081 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 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 -> #1 (&port_lock_key){-.-.}-{3:3}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xa7/0xf0 kernel/locking/spinlock.c:162 uart_port_lock_irqsave include/linux/serial_core.h:717 [inline] serial8250_console_write+0x17e/0x1ba0 drivers/tty/serial/8250/8250_port.c:3355 console_emit_next_record kernel/printk/printk.c:3138 [inline] console_flush_all+0x728/0xc40 kernel/printk/printk.c:3226 __console_flush_and_unlock kernel/printk/printk.c:3285 [inline] console_unlock+0xc4/0x270 kernel/printk/printk.c:3325 vprintk_emit+0x5b7/0x7a0 kernel/printk/printk.c:2450 _printk+0xcf/0x120 kernel/printk/printk.c:2475 register_console+0xa8b/0xf90 kernel/printk/printk.c:4126 univ8250_console_init+0x52/0x90 drivers/tty/serial/8250/8250_core.c:516 console_init+0x1a1/0x670 kernel/printk/printk.c:4325 start_kernel+0x2cc/0x500 init/main.c:1035 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:307 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:288 common_startup_64+0x13e/0x147 -> #0 (console_owner){-.-.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 console_trylock_spinning kernel/printk/printk.c:2048 [inline] vprintk_emit+0x460/0x7a0 kernel/printk/printk.c:2449 _printk+0xcf/0x120 kernel/printk/printk.c:2475 __slab_bug+0x6e/0xd0 mm/slub.c:1065 slab_bug+0x57/0x80 mm/slub.c:1076 list_slab_objects+0x35/0x1c0 mm/slub.c:5866 free_partial mm/slub.c:5903 [inline] __kmem_cache_shutdown+0xd4/0x250 mm/slub.c:5934 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:523 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x583/0x690 block/bio.c:1764 bch2_fs_io_read_exit+0x67/0x80 fs/bcachefs/io_read.c:1513 __bch2_fs_free fs/bcachefs/super.c:607 [inline] bch2_fs_release+0x24c/0x830 fs/bcachefs/super.c:667 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 deactivate_locked_super+0xb9/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: console_owner --> &port->lock#2 --> &n->list_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&n->list_lock); lock(&port->lock#2); lock(&n->list_lock); lock(console_owner); *** DEADLOCK *** 4 locks held by syz-executor/5829: #0: ffffffff8e890948 (bio_slab_lock){+.+.}-{4:4}, at: bio_put_slab block/bio.c:140 [inline] #0: ffffffff8e890948 (bio_slab_lock){+.+.}-{4:4}, at: bioset_exit+0x44a/0x690 block/bio.c:1764 #1: ffffffff8dfd41f0 (cpu_hotplug_lock){++++}-{0:0}, at: kmem_cache_destroy+0x3e/0x160 mm/slab_common.c:510 #2: ffffffff8e22bc30 (slab_mutex){+.+.}-{4:4}, at: kmem_cache_destroy+0x4c/0x160 mm/slab_common.c:511 #3: ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: spin_lock_irq include/linux/spinlock.h:376 [inline] #3: ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: free_partial mm/slub.c:5897 [inline] #3: ffff888031e7ca98 (&n->list_lock){-.-.}-{3:3}, at: __kmem_cache_shutdown+0xa9/0x250 mm/slub.c:5934 stack backtrace: CPU: 1 UID: 0 PID: 5829 Comm: syz-executor Not tainted 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 console_trylock_spinning kernel/printk/printk.c:2048 [inline] vprintk_emit+0x460/0x7a0 kernel/printk/printk.c:2449 _printk+0xcf/0x120 kernel/printk/printk.c:2475 __slab_bug+0x6e/0xd0 mm/slub.c:1065 slab_bug+0x57/0x80 mm/slub.c:1076 list_slab_objects+0x35/0x1c0 mm/slub.c:5866 free_partial mm/slub.c:5903 [inline] __kmem_cache_shutdown+0xd4/0x250 mm/slub.c:5934 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:523 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x583/0x690 block/bio.c:1764 bch2_fs_io_read_exit+0x67/0x80 fs/bcachefs/io_read.c:1513 __bch2_fs_free fs/bcachefs/super.c:607 [inline] bch2_fs_release+0x24c/0x830 fs/bcachefs/super.c:667 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 deactivate_locked_super+0xb9/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1da98fc57 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffad2fdc88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fd1daa10925 RCX: 00007fd1da98fc57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffad2fdd40 RBP: 00007fffad2fdd40 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffad2fedd0 R13: 00007fd1daa10925 R14: 00000000000519af R15: 00007fffad2fee10 BUG bio-488 (Not tainted): Objects remaining on __kmem_cache_shutdown() ----------------------------------------------------------------------------- Object 0xffff888079362000 @offset=0 Object 0xffff888079362280 @offset=640 Slab 0xffffea0001e4d880 objects=12 used=2 fp=0xffff888079362500 flags=0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff) ------------[ cut here ]------------ WARNING: mm/slub.c:1171 at __slab_err+0x15/0x20 mm/slub.c:1171, CPU#1: syz-executor/5829 Modules linked in: CPU: 1 UID: 0 PID: 5829 Comm: syz-executor Tainted: G B 6.16.0-rc4-next-20250702-syzkaller #0 PREEMPT(full) Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:__slab_err+0x15/0x20 mm/slub.c:1171 Code: 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 e8 bb ff ff ff bf 05 00 00 00 be 01 00 00 00 e8 0c 6c 5b 00 90 <0f> 0b 90 e9 03 38 4a 0a cc 66 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc9000404fba8 EFLAGS: 00010093 RAX: ffffffff81836dfa RBX: ffff8880610763c0 RCX: ffff888026ac9e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: ffffffff92a69fc7 R09: 1ffffffff254d3f8 R10: dffffc0000000000 R11: fffffbfff254d3f9 R12: ffff888031e7cac8 R13: ffffea0001e4d880 R14: ffffea0001b20a10 R15: ffff888031e7ca80 FS: 000055555575d500(0000) GS:ffff888125d1d000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff8d2bb3000 CR3: 0000000078e02000 CR4: 00000000003526f0 Call Trace: free_partial mm/slub.c:5903 [inline] __kmem_cache_shutdown+0xd4/0x250 mm/slub.c:5934 kmem_cache_destroy+0x76/0x160 mm/slab_common.c:523 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x583/0x690 block/bio.c:1764 bch2_fs_io_read_exit+0x67/0x80 fs/bcachefs/io_read.c:1513 __bch2_fs_free fs/bcachefs/super.c:607 [inline] bch2_fs_release+0x24c/0x830 fs/bcachefs/super.c:667 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 deactivate_locked_super+0xb9/0x130 fs/super.c:474 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1417 task_work_run+0x1d1/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fd1da98fc57 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffad2fdc88 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007fd1daa10925 RCX: 00007fd1da98fc57 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffad2fdd40 RBP: 00007fffad2fdd40 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffad2fedd0 R13: 00007fd1daa10925 R14: 00000000000519af R15: 00007fffad2fee10 --- 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 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