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@xxxxxxxxxxxxxxxxxxxxxxxxx ===================================== 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: [<ffffffff81f01c0f>] spin_unlock include/linux/spinlock.h:391 [inline] [<ffffffff81f01c0f>] 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: <TASK> __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 </TASK> ------------[ 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: <TASK> __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 </TASK> --- 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@xxxxxxxxxxxxxxxx. 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
