On 2023/12/28 04:51, syzbot wrote:
Hello, syzbot found the following issue on: HEAD commit: 5254c0cbc92d Merge tag 'block-6.7-2023-12-22' of git://git.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=10cc6995e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=314e9ad033a7d3a7 dashboard link: https://syzkaller.appspot.com/bug?extid=59dcc2e7283a6f5f5ba1 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=13e35809e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=155d5fd6e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ebe09a5995ee/disk-5254c0cb.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/02178d7f5f98/vmlinux-5254c0cb.xz kernel image: https://storage.googleapis.com/syzbot-assets/12307f47d87c/bzImage-5254c0cb.xz The issue was bisected to: commit ea4452de2ae987342fadbdd2c044034e6480daad Author: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> Date: Fri Nov 18 10:00:11 2022 +0000 mm: fix unexpected changes to {failslab|fail_page_alloc}.attr bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=13027f76e80000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10827f76e80000 console output: https://syzkaller.appspot.com/x/log.txt?x=17027f76e80000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+59dcc2e7283a6f5f5ba1@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: ea4452de2ae9 ("mm: fix unexpected changes to {failslab|fail_page_alloc}.attr") R10: 0000000000000000 R11: 0000000000000246 R12: 00007efe98069194 R13: 00007efe97fd2210 R14: 0000000000000002 R15: 6972642f7665642f </TASK> ------------[ cut here ]------------ WARNING: CPU: 0 PID: 5107 at drivers/gpu/drm/drm_prime.c:227 drm_prime_destroy_file_private+0x43/0x60 drivers/gpu/drm/drm_prime.c:227
The warning is caused by !RB_EMPTY_ROOT(&prime_fpriv->dmabufs): drm_prime_destroy_file_private --> WARN_ON(!RB_EMPTY_ROOT(&prime_fpriv->dmabufs)); It seems irrelevant to the logic of fault injection. So I don't see why the commit ea4452de2ae9 can cause this warning. :(
Modules linked in: CPU: 0 PID: 5107 Comm: syz-executor227 Not tainted 6.7.0-rc6-syzkaller-00248-g5254c0cbc92d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:drm_prime_destroy_file_private+0x43/0x60 drivers/gpu/drm/drm_prime.c:227 Code: 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 21 48 8b 83 90 00 00 00 48 85 c0 75 06 5b e9 13 f1 93 fc e8 0e f1 93 fc 90 <0f> 0b 90 5b e9 04 f1 93 fc e8 3f 9b ea fc eb d8 66 66 2e 0f 1f 84 RSP: 0018:ffffc90003bdf9e0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff888019f28378 RCX: ffffc90003bdf9b0 RDX: ffff888018ff9dc0 RSI: ffffffff84f380c2 RDI: ffff888019f28408 RBP: ffff888019f28000 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8f193a57 R11: 0000000000000000 R12: ffff88814829a000 R13: ffff888019f282a8 R14: ffff88814829a068 R15: ffff88814829a0a0 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe98050410 CR3: 000000006d1ff000 CR4: 0000000000350ef0 Call Trace: <TASK> drm_file_free.part.0+0x738/0xb90 drivers/gpu/drm/drm_file.c:290 drm_file_free drivers/gpu/drm/drm_file.c:247 [inline] drm_close_helper.isra.0+0x180/0x1f0 drivers/gpu/drm/drm_file.c:307 drm_release+0x22a/0x4f0 drivers/gpu/drm/drm_file.c:494 __fput+0x270/0xb70 fs/file_table.c:394 task_work_run+0x14d/0x240 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa8a/0x2ad0 kernel/exit.c:869 do_group_exit+0xd4/0x2a0 kernel/exit.c:1018 get_signal+0x23b5/0x2790 kernel/signal.c:2904 arch_do_signal_or_restart+0x90/0x7f0 arch/x86/kernel/signal.c:309 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x121/0x240 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1e/0x60 kernel/entry/common.c:296 do_syscall_64+0x4d/0x110 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7efe98014769 Code: Unable to access opcode bytes at 0x7efe9801473f. RSP: 002b:00007efe97fd2208 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007efe9809c408 RCX: 00007efe98014769 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007efe9809c408 RBP: 00007efe9809c400 R08: 0000000000003131 R09: 0000000000003131 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efe98069194 R13: 00007efe97fd2210 R14: 0000000000000002 R15: 6972642f7665642f </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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. 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
