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Message-ID: <000000000000d6e06d06102ae80b@google.com> Date: Tue, 30 Jan 2024 06:52:21 -0800 From: syzbot <syzbot+cdee56dbcdf0096ef605@...kaller.appspotmail.com> To: adilger.kernel@...ger.ca, chandan.babu@...cle.com, jack@...e.com, linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org, syzkaller-bugs@...glegroups.com, tytso@....edu Subject: Re: [syzbot] [xfs?] [ext4?] general protection fault in jbd2__journal_start syzbot has found a reproducer for the following issue on: HEAD commit: 861c0981648f Merge tag 'jfs-6.8-rc3' of github.com:kleikam.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=13ca8d97e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=b0b9993d7d6d1990 dashboard link: https://syzkaller.appspot.com/bug?extid=cdee56dbcdf0096ef605 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=104393efe80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1393b90fe80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7c6cc521298d/disk-861c0981.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6203c94955db/vmlinux-861c0981.xz kernel image: https://storage.googleapis.com/syzbot-assets/17e76e12b58c/bzImage-861c0981.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/d31d4eed2912/mount_3.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cdee56dbcdf0096ef605@...kaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc000a8a4829: 0000 [#1] PREEMPT SMP KASAN KASAN: probably user-memory-access in range [0x0000000054524148-0x000000005452414f] CPU: 1 PID: 5065 Comm: syz-executor260 Not tainted 6.8.0-rc2-syzkaller-00031-g861c0981648f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:jbd2__journal_start+0x87/0x5d0 fs/jbd2/transaction.c:496 Code: 74 63 48 8b 1b 48 85 db 74 79 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 63 4d 8f ff 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 4a 4d 8f ff 4c 39 65 00 0f 85 1a RSP: 0018:ffffc900043265c8 EFLAGS: 00010203 RAX: 000000000a8a4829 RBX: ffff8880205fa3a8 RCX: ffff8880235dbb80 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88801c1a6000 RBP: 000000005452414e R08: 0000000000000c40 R09: 0000000000000001 R10: dffffc0000000000 R11: ffffed1003834871 R12: ffff88801c1a6000 R13: dffffc0000000000 R14: 0000000000000c40 R15: 0000000000000002 FS: 0000555556f90380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020020000 CR3: 0000000021fed000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __ext4_journal_start_sb+0x215/0x5b0 fs/ext4/ext4_jbd2.c:112 __ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline] ext4_dirty_inode+0x92/0x110 fs/ext4/inode.c:5969 __mark_inode_dirty+0x305/0xda0 fs/fs-writeback.c:2452 generic_update_time fs/inode.c:1905 [inline] inode_update_time fs/inode.c:1918 [inline] __file_update_time fs/inode.c:2106 [inline] file_update_time+0x39b/0x3e0 fs/inode.c:2136 ext4_page_mkwrite+0x207/0xdf0 fs/ext4/inode.c:6090 do_page_mkwrite+0x197/0x470 mm/memory.c:2966 wp_page_shared mm/memory.c:3353 [inline] do_wp_page+0x20e3/0x4c80 mm/memory.c:3493 handle_pte_fault mm/memory.c:5160 [inline] __handle_mm_fault+0x26a3/0x72b0 mm/memory.c:5285 handle_mm_fault+0x27e/0x770 mm/memory.c:5450 do_user_addr_fault arch/x86/mm/fault.c:1415 [inline] handle_page_fault arch/x86/mm/fault.c:1507 [inline] exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1563 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:71 Code: 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 <f3> a4 c3 48 89 c8 48 c1 e9 03 83 e0 07 f3 48 a5 89 c1 85 c9 75 b3 RSP: 0018:ffffc900043270f8 EFLAGS: 00050202 RAX: ffffffff848cda01 RBX: 0000000020020040 RCX: 0000000000000040 RDX: 0000000000000000 RSI: ffff8880131873b0 RDI: 0000000020020000 RBP: 1ffff92000864f26 R08: ffff8880131873ef R09: 1ffff11002630e7d R10: dffffc0000000000 R11: ffffed1002630e7e R12: 00000000000000c0 R13: dffffc0000000000 R14: 000000002001ff80 R15: ffff888013187330 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x86/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] xfs_bulkstat_fmt+0x4f/0x120 fs/xfs/xfs_ioctl.c:744 xfs_bulkstat_one_int+0xd8b/0x12e0 fs/xfs/xfs_itable.c:161 xfs_bulkstat_iwalk+0x72/0xb0 fs/xfs/xfs_itable.c:239 xfs_iwalk_ag_recs+0x4c3/0x820 fs/xfs/xfs_iwalk.c:220 xfs_iwalk_run_callbacks+0x25b/0x490 fs/xfs/xfs_iwalk.c:376 xfs_iwalk_ag+0xad6/0xbd0 fs/xfs/xfs_iwalk.c:482 xfs_iwalk+0x360/0x6f0 fs/xfs/xfs_iwalk.c:584 xfs_bulkstat+0x4f8/0x6c0 fs/xfs/xfs_itable.c:308 xfs_ioc_bulkstat+0x3d0/0x450 fs/xfs/xfs_ioctl.c:867 xfs_file_ioctl+0x6a5/0x1980 fs/xfs/xfs_ioctl.c:1994 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f02d4018b59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdbe0deb98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f02d4018b59 RDX: 000000002001fc40 RSI: 000000008040587f RDI: 0000000000000004 RBP: 00000000000116e3 R08: 0000000000000000 R09: 0000555556f914c0 R10: 0000000020000300 R11: 0000000000000246 R12: 00007ffdbe0debc0 R13: 00007ffdbe0debac R14: 431bde82d7b634db R15: 00007f02d406103b </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:jbd2__journal_start+0x87/0x5d0 fs/jbd2/transaction.c:496 Code: 74 63 48 8b 1b 48 85 db 74 79 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 63 4d 8f ff 48 8b 2b 48 89 e8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 ef e8 4a 4d 8f ff 4c 39 65 00 0f 85 1a RSP: 0018:ffffc900043265c8 EFLAGS: 00010203 RAX: 000000000a8a4829 RBX: ffff8880205fa3a8 RCX: ffff8880235dbb80 RDX: 0000000000000000 RSI: 0000000000000002 RDI: ffff88801c1a6000 RBP: 000000005452414e R08: 0000000000000c40 R09: 0000000000000001 R10: dffffc0000000000 R11: ffffed1003834871 R12: ffff88801c1a6000 R13: dffffc0000000000 R14: 0000000000000c40 R15: 0000000000000002 FS: 0000555556f90380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020020000 CR3: 0000000021fed000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 74 63 je 0x65 2: 48 8b 1b mov (%rbx),%rbx 5: 48 85 db test %rbx,%rbx 8: 74 79 je 0x83 a: 48 89 d8 mov %rbx,%rax d: 48 c1 e8 03 shr $0x3,%rax 11: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 63 4d 8f ff call 0xff8f4d83 20: 48 8b 2b mov (%rbx),%rbp 23: 48 89 e8 mov %rbp,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 ef mov %rbp,%rdi 34: e8 4a 4d 8f ff call 0xff8f4d83 39: 4c 39 65 00 cmp %r12,0x0(%rbp) 3d: 0f .byte 0xf 3e: 85 1a test %ebx,(%rdx) --- 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.
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