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Message-ID: <670cb772.050a0220.3e960.0056.GAE@google.com> Date: Sun, 13 Oct 2024 23:17:22 -0700 From: syzbot <syzbot+0058ba2149d0a0c61344@...kaller.appspotmail.com> To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, syzkaller-bugs@...glegroups.com Subject: [syzbot] [ocfs2?] general protection fault in ocfs2_evict_inode Hello, syzbot found the following issue on: HEAD commit: 33ce24234fca Add linux-next specific files for 20241008 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14148f07980000 kernel config: https://syzkaller.appspot.com/x/.config?x=4750ca93740b938d dashboard link: https://syzkaller.appspot.com/bug?extid=0058ba2149d0a0c61344 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/ee8dc2df0c57/disk-33ce2423.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/dc473c0fa06e/vmlinux-33ce2423.xz kernel image: https://storage.googleapis.com/syzbot-assets/4671f1ca2e61/bzImage-33ce2423.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0058ba2149d0a0c61344@...kaller.appspotmail.com ocfs2: Unmounting device (7,4) on (node local) Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 UID: 0 PID: 11386 Comm: syz.4.712 Not tainted 6.12.0-rc2-next-20241008-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:ocfs2_clear_inode fs/ocfs2/inode.c:1208 [inline] RIP: 0010:ocfs2_evict_inode+0xdd3/0x4680 fs/ocfs2/inode.c:1220 Code: 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 5f 17 71 fe 4c 01 f3 4d 8b 24 24 49 83 c4 08 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 3e 17 71 fe 49 8b 3c 24 49 81 c7 RSP: 0018:ffffc9000349ef00 EFLAGS: 00010202 RAX: 0000000000000001 RBX: fffff52000693df4 RCX: ffff88802db11e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000349f650 R08: ffffffff838d937e R09: 1ffff1100bf6f616 R10: dffffc0000000000 R11: ffffed100bf6f617 R12: 0000000000000008 R13: 1ffff1100bf6f644 R14: dffffc0000000000 R15: ffff88805fb7b338 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021000000 CR3: 000000002dcfc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> evict+0x4e8/0x9b0 fs/inode.c:808 __ocfs2_free_slot_info fs/ocfs2/slot_map.c:307 [inline] ocfs2_free_slot_info+0x94/0x270 fs/ocfs2/slot_map.c:443 ocfs2_delete_osb+0x58/0x180 fs/ocfs2/super.c:2497 ocfs2_dismount_volume+0x594/0x8f0 fs/ocfs2/super.c:1936 generic_shutdown_super+0x139/0x2d0 fs/super.c:642 kill_block_super+0x44/0x90 fs/super.c:1696 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x16a3/0x1740 kernel/signal.c:2917 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f581257dff9 Code: Unable to access opcode bytes at 0x7f581257dfcf. RSP: 002b:00007f5813441038 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: 0000000000ffecc0 RBX: 00007f5812735f80 RCX: 00007f581257dff9 RDX: 7706c522012798af RSI: 0000000020001340 RDI: 0000000000000005 RBP: 00007f58125f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5812735f80 R15: 00007ffd87bff1c8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ocfs2_clear_inode fs/ocfs2/inode.c:1208 [inline] RIP: 0010:ocfs2_evict_inode+0xdd3/0x4680 fs/ocfs2/inode.c:1220 Code: 00 00 4c 89 e0 48 c1 e8 03 42 80 3c 30 00 74 08 4c 89 e7 e8 5f 17 71 fe 4c 01 f3 4d 8b 24 24 49 83 c4 08 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 74 08 4c 89 e7 e8 3e 17 71 fe 49 8b 3c 24 49 81 c7 RSP: 0018:ffffc9000349ef00 EFLAGS: 00010202 RAX: 0000000000000001 RBX: fffff52000693df4 RCX: ffff88802db11e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000349f650 R08: ffffffff838d937e R09: 1ffff1100bf6f616 R10: dffffc0000000000 R11: ffffed100bf6f617 R12: 0000000000000008 R13: 1ffff1100bf6f644 R14: dffffc0000000000 R15: ffff88805fb7b338 FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000021000000 CR3: 000000002dcfc000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4c 89 e0 mov %r12,%rax 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) e: 74 08 je 0x18 10: 4c 89 e7 mov %r12,%rdi 13: e8 5f 17 71 fe call 0xfe711777 18: 4c 01 f3 add %r14,%rbx 1b: 4d 8b 24 24 mov (%r12),%r12 1f: 49 83 c4 08 add $0x8,%r12 23: 4c 89 e0 mov %r12,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 e7 mov %r12,%rdi 34: e8 3e 17 71 fe call 0xfe711777 39: 49 8b 3c 24 mov (%r12),%rdi 3d: 49 rex.WB 3e: 81 .byte 0x81 3f: c7 .byte 0xc7 --- 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@...glegroups.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
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