From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) (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 0382F199EB7 for ; Mon, 25 Nov 2024 12:41:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732538485; cv=none; b=Q2dj5qSGf15mhcL6jSPEqPIx92JBySXeyaaR3HEKdagdvIeI/5os7ZaWX7VUpCpCViF5bP1dKleolY9lX7wVgutXpnz613Mndaoa9wTfGCZHbw2zI+/cNR/DO9ef/2qSdCO2FMXPCNHimmzUhtLmUeKwmyu8XHq4E8Z/0n66yEo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732538485; c=relaxed/simple; bh=5Q9L81jn7hULPbu6trXuIMECP7YDHINg2ojX1G80uaI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=D4QHa0GXqxFmztb6+GZlV0WImy9qSD7+sh0/jAodCxR+fe7uwLB1Fa3u3Yzs6jCsM4A3mLRN5zN4n7G6EhrrVrKABd5xT2jGkUBmpJSvh+LmP7ZEFhqn0qoJzTZI4J0tWFbGe/iVizZe0ytprKpF6jz7qUMbBghgsd5hry7ndA4= 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=209.85.166.200 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-f200.google.com with SMTP id e9e14a558f8ab-3a794990ef3so35185155ab.1 for ; Mon, 25 Nov 2024 04:41:23 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732538483; x=1733143283; 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=euSAAuk7huTYwElhTsQhtYtA71Wz6NJWASwxT/CmTsg=; b=VZL9Qw8V8jBWQ7pXVR1rdk5CEYSOnrrzJPcYJwBBvVewbYgTg/oKb8Q5OlAOjx/LE6 T550h2dYSAJ66U74uKjowjYi4NZqhjOhuyJrBgGUGb+iY6JgkE0R5RPV8B6WZv32zIwS Xvr9ZtXof0yAyHVbEyYpm1GhpMJny7fsWPLwDJarcY+3JlkxcVxhOe3FHXIXhBSbo2a6 wQWabsj4fcUoIUP02N1oT9yzYHHFb60gwW/7vQ10Wi/VmEKwi7DELX02u51cFJ39lWAm GHruo+qU2J0CctDrsZ1ddYpIz7/mQOmSnO7iehYjzFSsMsVxL8ER2pq96MNcvj/0ykjl o7Nw== X-Forwarded-Encrypted: i=1; AJvYcCVrddv8HMqzs+q2blishcGg+9RWa8ODBWoVxwA/h4WoYkAHRjL3pSP5nZHXnYDtY8OPCWZGhAll/VFABiQ=@vger.kernel.org X-Gm-Message-State: AOJu0YwaYXMESBezWrAlXla/yCRX0DH01pYWB4s/SluZHUc9N20Ncg4k TNcz7w2upCM9zmvvXK4W+8Uii8ZSehsh3KHwCi1/pvfi2Bg/ny75iy0v6q7hTWJBO40smLNJFi8 PKrn0f3qzYnf+lyWt39nR1dUInGzqfNJUhShvDZpajaSFiYOH8ul5Kbs= X-Google-Smtp-Source: AGHT+IGXDWlLYqxBQzFMAdM2WrAqBhDPBsQmuzARLj7h18kvLLNbtS8AqlU9eFnSHTwYG2MQ6XHrwujisIIwOzB8fXZE2A0nd0iJ Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1541:b0:3a7:a99f:eab8 with SMTP id e9e14a558f8ab-3a7a99fee5fmr50619985ab.2.1732538483145; Mon, 25 Nov 2024 04:41:23 -0800 (PST) Date: Mon, 25 Nov 2024 04:41:23 -0800 In-Reply-To: <6738c3ba.050a0220.bb738.000d.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67447073.050a0220.1cc393.007b.GAE@google.com> Subject: Re: [syzbot] [kernel?] WARNING: locking bug in get_random_u8 From: syzbot To: Jason@zx2c4.com, bigeasy@linutronix.de, boqun.feng@gmail.com, hdanton@sina.com, jason@zx2c4.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tytso@mit.edu Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 9f16d5e6f220 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16ee775f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=d8bc8a5565eebec6 dashboard link: https://syzkaller.appspot.com/bug?extid=7f4f9a43a9c78eaee04f compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1612dee8580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-9f16d5e6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dbaabe559df8/vmlinux-9f16d5e6.xz kernel image: https://storage.googleapis.com/syzbot-assets/5fe0afceb260/bzImage-9f16d5e6.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+7f4f9a43a9c78eaee04f@syzkaller.appspotmail.com ============================= [ BUG: Invalid wait context ] 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Not tainted ----------------------------- sshd/5973 is trying to lock: ffff88806a63af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: local_lock_acquire include/linux/local_lock_internal.h:29 [inline] ffff88806a63af60 (batched_entropy_u8.lock){..-.}-{3:3}, at: get_random_u8+0xef/0x7f0 drivers/char/random.c:551 other info that might help us debug this: context-{2:2} 2 locks held by sshd/5973: #0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1bba80 (rcu_read_lock){....}-{1:3}, at: lock_vma_under_rcu+0xe4/0x980 mm/memory.c:6272 #1: ffff88806a63ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 stack backtrace: CPU: 0 UID: 0 PID: 5973 Comm: sshd Not tainted 6.12.0-syzkaller-09073-g9f16d5e6f220 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_lock_invalid_wait_context kernel/locking/lockdep.c:4826 [inline] check_wait_context kernel/locking/lockdep.c:4898 [inline] __lock_acquire+0x878/0x3c40 kernel/locking/lockdep.c:5176 lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 local_lock_acquire include/linux/local_lock_internal.h:29 [inline] get_random_u8+0x107/0x7f0 drivers/char/random.c:551 get_random_u32_below include/linux/random.h:78 [inline] kfence_guarded_alloc mm/kfence/core.c:421 [inline] __kfence_alloc+0x4e8/0x15f0 mm/kfence/core.c:1136 kfence_alloc include/linux/kfence.h:129 [inline] slab_alloc_node mm/slub.c:4118 [inline] __kmalloc_cache_noprof+0x1e4/0x300 mm/slub.c:4290 kmalloc_noprof include/linux/slab.h:879 [inline] add_stack_record_to_list mm/page_owner.c:172 [inline] inc_stack_record_count mm/page_owner.c:214 [inline] __set_page_owner+0x34d/0x560 mm/page_owner.c:329 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556 prep_new_page mm/page_alloc.c:1564 [inline] get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474 __alloc_pages_noprof+0x223/0x25a0 mm/page_alloc.c:4751 alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2265 stack_depot_save_flags+0x566/0x8f0 lib/stackdepot.c:627 kasan_save_stack+0x42/0x60 mm/kasan/common.c:48 __kasan_record_aux_stack+0xba/0xd0 mm/kasan/generic.c:541 task_work_add+0xc0/0x3b0 kernel/task_work.c:77 task_tick_numa kernel/sched/fair.c:3607 [inline] task_tick_fair+0x524/0x8e0 kernel/sched/fair.c:13054 sched_tick+0x1dd/0x4f0 kernel/sched/core.c:5652 update_process_times+0x19c/0x2d0 kernel/time/timer.c:2524 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x376/0x530 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x5fb/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:check_preemption_disabled+0x2/0xe0 lib/smp_processor_id.c:13 Code: 0f 65 8b 05 5c b2 d3 74 85 c0 74 04 90 0f 0b 90 e9 53 fc ff ff 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 54 <55> 53 48 83 ec 08 65 8b 1d ad 02 d5 74 65 8b 05 a2 02 d5 74 a9 ff RSP: 0000:ffffc90003e1fc58 EFLAGS: 00000282 RAX: 0000000000000001 RBX: ffff88803221720c RCX: ffffffff8b1a7dad RDX: 0000000000000001 RSI: ffffffff8bd1e0c0 RDI: ffffffff8bd1e100 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000006 R13: 0000000000000000 R14: 0000000000000300 R15: 00007f9bd4999fff rcu_lockdep_current_cpu_online+0x35/0x150 kernel/rcu/tree.c:4777 rcu_read_lock_held_common kernel/rcu/update.c:113 [inline] rcu_read_lock_held+0x27/0x50 kernel/rcu/update.c:349 mt_slot lib/maple_tree.c:803 [inline] mtree_range_walk+0x25b/0xbe0 lib/maple_tree.c:2802 mas_state_walk lib/maple_tree.c:3620 [inline] mas_walk+0x4f9/0x910 lib/maple_tree.c:4946 lock_vma_under_rcu+0x2b5/0x980 mm/memory.c:6274 do_user_addr_fault+0x457/0x13f0 arch/x86/mm/fault.c:1329 handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x55f75beb0823 Code: 4c 89 ed 4c 89 e7 f3 aa eb 48 4c 89 e7 e8 95 48 f7 ff 48 89 c5 48 85 c0 74 38 48 89 c7 4c 89 ee 4d 39 f4 76 11 4c 89 f1 31 c0 a4 4c 89 e1 4c 29 f1 f3 aa eb 05 4c 89 e1 f3 a4 4c 89 ef 48 83 RSP: 002b:00007ffed36adfb0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000360000 RCX: 0000000000228010 RDX: 0000000000000002 RSI: 00007f9bd3f8c000 RDI: 00007f9bd461e000 RBP: 00007f9bd44ee010 R08: 00007f9bd44ee010 R09: 0000000000000000 R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000360000 R13: 00007f9bd3e5c010 R14: 0000000000358000 R15: 00007ffed36ae168 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 65 8b 05 5c b2 d3 74 mov %gs:0x74d3b25c(%rip),%eax # 0x74d3b263 7: 85 c0 test %eax,%eax 9: 74 04 je 0xf b: 90 nop c: 0f 0b ud2 e: 90 nop f: e9 53 fc ff ff jmp 0xfffffc67 14: 0f 1f 00 nopl (%rax) 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 41 54 push %r12 * 29: 55 push %rbp <-- trapping instruction 2a: 53 push %rbx 2b: 48 83 ec 08 sub $0x8,%rsp 2f: 65 8b 1d ad 02 d5 74 mov %gs:0x74d502ad(%rip),%ebx # 0x74d502e3 36: 65 8b 05 a2 02 d5 74 mov %gs:0x74d502a2(%rip),%eax # 0x74d502df 3d: a9 .byte 0xa9 3e: ff .byte 0xff --- 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.