linux-kernel - Re: [syzbot] [bcachefs] WARNING in srcu_check_nmi

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Message-ID: <671e4655.050a0220.2b8c0f.01d8.GAE@google.com>
Date: Sun, 27 Oct 2024 06:55:33 -0700
From: syzbot <syzbot+314c2cfd4071ad738810@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, kvm@...r.kernel.org, 
	linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, 
	pbonzini@...hat.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [bcachefs] WARNING in srcu_check_nmi_safety (2)

syzbot has found a reproducer for the following issue on:

HEAD commit:    850925a8133c Merge tag '9p-for-6.12-rc5' of https://github..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1311ea87980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=309bb816d40abc28
dashboard link: https://syzkaller.appspot.com/bug?extid=314c2cfd4071ad738810
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14bf3e5f980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-850925a8.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c831c931f29c/vmlinux-850925a8.xz
kernel image: https://storage.googleapis.com/syzbot-assets/85f584e52a7f/bzImage-850925a8.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/9ebb84247bd1/mount_5.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+314c2cfd4071ad738810@...kaller.appspotmail.com

------------[ cut here ]------------
CPU 0 old state 2 new state 1
WARNING: CPU: 0 PID: 5631 at kernel/rcu/srcutree.c:708 srcu_check_nmi_safety+0xca/0x150 kernel/rcu/srcutree.c:708
Modules linked in:
CPU: 0 UID: 0 PID: 5631 Comm: syz.2.27 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:srcu_check_nmi_safety+0xca/0x150 kernel/rcu/srcutree.c:708
Code: 81 c3 c8 01 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 20 84 c0 75 77 8b 33 48 c7 c7 80 0d 0c 8c 89 ea 44 89 f9 e8 87 81 db ff 90 <0f> 0b 90 90 eb 0c 42 0f b6 04 23 84 c0 75 3d 45 89 3e 48 83 c4 08
RSP: 0000:ffffc9000d1c7648 EFLAGS: 00010246
RAX: 84aa6098780aa300 RBX: ffffe8ffffc537c8 RCX: ffff88803ecb8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000002 R08: ffffffff8155e452 R09: 1ffff11003f8519a
R10: dffffc0000000000 R11: ffffed1003f8519b R12: dffffc0000000000
R13: 0000607fe0053600 R14: ffffe8ffffc53620 R15: 0000000000000001
FS:  00007fe40acde6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe409f7e719 CR3: 000000001f99c000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 srcu_read_lock include/linux/srcu.h:248 [inline]
 __kvm_handle_hva_range virt/kvm/kvm_main.c:612 [inline]
 kvm_mmu_notifier_invalidate_range_end+0x90/0x3e0 virt/kvm/kvm_main.c:843
 mn_hlist_invalidate_end mm/mmu_notifier.c:550 [inline]
 __mmu_notifier_invalidate_range_end+0x241/0x410 mm/mmu_notifier.c:569
 mmu_notifier_invalidate_range_end include/linux/mmu_notifier.h:472 [inline]
 wp_page_copy mm/memory.c:3460 [inline]
 do_wp_page+0x265a/0x52d0 mm/memory.c:3745
 handle_pte_fault+0x10e3/0x6800 mm/memory.c:5771
 __handle_mm_fault mm/memory.c:5898 [inline]
 handle_mm_fault+0x1106/0x1bb0 mm/memory.c:6066
 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline]
 handle_page_fault arch/x86/mm/fault.c:1481 [inline]
 exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fe409e418e0
Code: 39 4f 08 72 4c 8d 4d ff 85 ed 74 33 66 0f 1f 44 00 00 48 39 f0 72 1b 4d 8b 07 49 89 c1 49 29 f1 47 0f b6 0c 08 45 84 c9 74 08 <45> 88 0c 00 49 8b 47 10 48 83 c0 01 49 89 47 10 83 e9 01 73 d3 41
RSP: 002b:00007fe40acdd4a0 EFLAGS: 00010202
RAX: 0000000000147010 RBX: 00007fe40acdd540 RCX: 0000000000000007
RDX: 00000000000007ff RSI: 0000000000001000 RDI: 00007fe40acdd5e0
RBP: 0000000000000008 R08: 00007fe400c00000 R09: 0000000000000015
R10: 0000000020005982 R11: 00000000000058ad R12: 0000000000000c01
R13: 00007fe40a005ae0 R14: 0000000000000017 R15: 00007fe40acdd5e0
 </TASK>


---
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.