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[2003:cb:c73b:3100:2d28:e0b7:1254:b2f6]) by smtp.gmail.com with ESMTPSA id k4-20020a05600c1c8400b00414807ef8dfsm21034990wms.5.2024.04.03.01.55.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 03 Apr 2024 01:55:14 -0700 (PDT) Message-ID: <579d5127-c763-4001-9625-4563a9316ac3@redhat.com> Date: Wed, 3 Apr 2024 10:55:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [mm?] WARNING: bad unlock balance in madvise_cold_or_pageout_pte_range To: syzbot , akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com References: <000000000000662a630615207d87@google.com> From: David Hildenbrand Cc: Ryan Roberts Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp 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MOvATmw6ZG+nbw2uiRQTXYjsDrn65VSilBGM2Cm4nGkpL7vv+ZANdGWMRI8c9EYJzIWKEKNrR8TeRObWRmqoDKqgxdbbuK9VmKdYULEfqnze2/RGYv+dqfCE6IhEuayCdZxnhw2yEMgwiAvGHWvqLDW3/eaL+9YgdnKcIhKv0myPquPIZE6BT6HxFlhPBk1xxgsY1Jzw6zMFDP0CGv9H+/6jhEsMDPykwTOwVtl555IV/kXl1+O4cyVlRvriiAEK4bpFL18qonLprxq5CD0oYA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 02.04.24 19:32, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: c0b832517f62 Add linux-next specific files for 20240402 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=155b7db1180000 > kernel config: https://syzkaller.appspot.com/x/.config?x=afcaf46d374cec8c > dashboard link: https://syzkaller.appspot.com/bug?extid=c641706ad4e9688cccdf > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > > Unfortunately, I don't have any reproducer for this issue yet. > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/0d36ec76edc7/disk-c0b83251.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/6f9bb4e37dd0/vmlinux-c0b83251.xz > kernel image: https://storage.googleapis.com/syzbot-assets/2349287b14b7/bzImage-c0b83251.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+c641706ad4e9688cccdf@syzkaller.appspotmail.com > > ===================================== > WARNING: bad unlock balance detected! > 6.9.0-rc2-next-20240402-syzkaller #0 Not tainted > ------------------------------------- > syz-executor.4/9211 is trying to release lock (ptlock_ptr(ptdesc)) at: > [] spin_unlock include/linux/spinlock.h:391 [inline] > [] madvise_cold_or_pageout_pte_range+0x170f/0x3990 mm/madvise.c:480 > but there are no more locks to release! > > other info that might help us debug this: > 1 lock held by syz-executor.4/9211: > #0: ffff888067e40b18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:144 [inline] > #0: ffff888067e40b18 (&mm->mmap_lock){++++}-{3:3}, at: do_madvise+0x481/0x44a0 mm/madvise.c:1429 > > stack backtrace: > CPU: 0 PID: 9211 Comm: syz-executor.4 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > Call Trace: > > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 > print_unlock_imbalance_bug+0x256/0x2c0 kernel/locking/lockdep.c:5194 > __lock_release kernel/locking/lockdep.c:5431 [inline] > lock_release+0x599/0x9f0 kernel/locking/lockdep.c:5774 > __raw_spin_unlock include/linux/spinlock_api_smp.h:141 [inline] > _raw_spin_unlock+0x16/0x50 kernel/locking/spinlock.c:186 > spin_unlock include/linux/spinlock.h:391 [inline] > madvise_cold_or_pageout_pte_range+0x170f/0x3990 mm/madvise.c:480 > walk_pmd_range mm/pagewalk.c:143 [inline] > walk_pud_range mm/pagewalk.c:221 [inline] > walk_p4d_range mm/pagewalk.c:256 [inline] > walk_pgd_range+0xba1/0x1810 mm/pagewalk.c:293 > __walk_page_range+0x132/0x720 mm/pagewalk.c:395 > walk_page_range+0x58f/0x7c0 mm/pagewalk.c:521 > madvise_cold_page_range mm/madvise.c:562 [inline] > madvise_cold mm/madvise.c:584 [inline] > madvise_vma_behavior mm/madvise.c:1028 [inline] > madvise_walk_vmas mm/madvise.c:1256 [inline] > do_madvise+0x1e7b/0x44a0 mm/madvise.c:1442 > __do_sys_madvise mm/madvise.c:1457 [inline] > __se_sys_madvise mm/madvise.c:1455 [inline] > __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1455 > do_syscall_64+0xfb/0x240 > entry_SYSCALL_64_after_hwframe+0x72/0x7a > RIP: 0033:0x7ff60947dda9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ff60a1b50c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 00007ff6095abf80 RCX: 00007ff60947dda9 > RDX: 0000000000000014 RSI: 0000000000600000 RDI: 0000000020000000 > RBP: 00007ff6094ca47a R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 000000000000000b R14: 00007ff6095abf80 R15: 00007fffacd4bc68 > > ------------[ cut here ]------------ > pvqspinlock: lock 0xffff88802ed23120 has corrupted value 0x0! > WARNING: CPU: 1 PID: 9211 at kernel/locking/qspinlock_paravirt.h:510 __pv_queued_spin_unlock_slowpath+0x241/0x2f0 kernel/locking/qspinlock_paravirt.h:508 > Modules linked in: > CPU: 1 PID: 9211 Comm: syz-executor.4 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 > RIP: 0010:__pv_queued_spin_unlock_slowpath+0x241/0x2f0 kernel/locking/qspinlock_paravirt.h:508 > Code: 65 47 6e f6 4c 89 f0 48 c1 e8 03 0f b6 04 18 84 c0 0f 85 9f 00 00 00 41 8b 16 48 c7 c7 c0 26 cb 8b 4c 89 f6 e8 90 f3 cb f5 90 <0f> 0b 90 90 eb 8d 44 89 f1 80 e1 07 38 c1 0f 8c 26 ff ff ff 4c 89 > RSP: 0018:ffffc9000e477238 EFLAGS: 00010246 > RAX: 5e9807e53cfb4f00 RBX: dffffc0000000000 RCX: 0000000000040000 > RDX: ffffc9000b3b8000 RSI: 000000000003ffff RDI: 0000000000040000 > RBP: dffffc0000000000 R08: ffffffff81580192 R09: fffffbfff1c39b10 > R10: dffffc0000000000 R11: fffffbfff1c39b10 R12: 1ffff11005da4626 > R13: ffff88802ed23130 R14: ffff88802ed23120 R15: ffff88802ed23120 > FS: 00007ff60a1b56c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fea8ecdaab3 CR3: 000000005d0fe000 CR4: 00000000003506f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > __raw_callee_save___pv_queued_spin_unlock_slowpath+0x15/0x30 > .slowpath+0x9/0x16 > pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:589 [inline] > queued_spin_unlock arch/x86/include/asm/qspinlock.h:57 [inline] > do_raw_spin_unlock+0x13c/0x8b0 kernel/locking/spinlock_debug.c:142 > __raw_spin_unlock include/linux/spinlock_api_smp.h:142 [inline] > _raw_spin_unlock+0x1e/0x50 kernel/locking/spinlock.c:186 > spin_unlock include/linux/spinlock.h:391 [inline] > madvise_cold_or_pageout_pte_range+0x170f/0x3990 mm/madvise.c:480 > walk_pmd_range mm/pagewalk.c:143 [inline] > walk_pud_range mm/pagewalk.c:221 [inline] > walk_p4d_range mm/pagewalk.c:256 [inline] > walk_pgd_range+0xba1/0x1810 mm/pagewalk.c:293 > __walk_page_range+0x132/0x720 mm/pagewalk.c:395 > walk_page_range+0x58f/0x7c0 mm/pagewalk.c:521 > madvise_cold_page_range mm/madvise.c:562 [inline] > madvise_cold mm/madvise.c:584 [inline] > madvise_vma_behavior mm/madvise.c:1028 [inline] > madvise_walk_vmas mm/madvise.c:1256 [inline] > do_madvise+0x1e7b/0x44a0 mm/madvise.c:1442 > __do_sys_madvise mm/madvise.c:1457 [inline] > __se_sys_madvise mm/madvise.c:1455 [inline] > __x64_sys_madvise+0xa6/0xc0 mm/madvise.c:1455 > do_syscall_64+0xfb/0x240 > entry_SYSCALL_64_after_hwframe+0x72/0x7a > RIP: 0033:0x7ff60947dda9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ff60a1b50c8 EFLAGS: 00000246 ORIG_RAX: 000000000000001c > RAX: ffffffffffffffda RBX: 00007ff6095abf80 RCX: 00007ff60947dda9 > RDX: 0000000000000014 RSI: 0000000000600000 RDI: 0000000020000000 > RBP: 00007ff6094ca47a R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 000000000000000b R14: 00007ff6095abf80 R15: 00007fffacd4bc68 > > > > --- > 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 > I'd suspect: commit 38456b4a3c609b205d5fdc6ef5347824a83fd818 Author: Ryan Roberts Date: Wed Mar 27 14:45:37 2024 +0000 mm: madvise: avoid split during MADV_PAGEOUT and MADV_COLD but I don't immediately see the issue. CCing Ryan. -- Cheers, David / dhildenb