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Message-ID: <00000000000084bb2e0620cf1e89@google.com> Date: Thu, 29 Aug 2024 02:30:02 -0700 From: syzbot <syzbot+ba3c0273042a898c230e@...kaller.appspotmail.com> To: linux-kernel@...r.kernel.org, lizhi.xu@...driver.com, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [btrfs?] kernel BUG in __extent_writepage_io (2) Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in try_merge_map em: ffff88802539cdc8, blockstart: 18446744073709551613, start: 0, len: 503808, btrfs_get_extent em: ffff88802539cdc8, blockstart: 18446744073709551613, em refs: 1, add_extent_mapping Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 1 UID: 0 PID: 6499 Comm: syz.4.24 Not tainted 6.11.0-rc5-syzkaller-00081-gd5d547aa7b51-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:extent_map_block_start fs/btrfs/extent_map.h:154 [inline] RIP: 0010:try_merge_map+0x684/0x8e0 fs/btrfs/extent_map.c:387 Code: 19 e8 a0 f9 e1 fd 48 8b 2c 24 eb 0e e8 95 f9 e1 fd 48 8b 2c 24 4c 8b 64 24 10 48 83 c5 28 48 89 e8 48 c1 e8 03 48 89 44 24 20 <42> 80 3c 38 00 74 08 48 89 ef e8 4d 16 46 fe 48 89 6c 24 18 48 8b RSP: 0018:ffffc90008e8f2c0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffff88802539cdc8 RCX: ffff88802b4e0000 RDX: 0000000000000000 RSI: fffffffffffffffd RDI: fffffffffffffffc RBP: 0000000000000028 R08: ffffffff83b19139 R09: 1ffff11004a739c3 R10: dffffc0000000000 R11: ffffed1004a739c4 R12: fffffffffffffffd R13: ffff88802539ce18 R14: 1ffff11004a739c3 R15: dffffc0000000000 FS: 00007f6c742e86c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6c742e7f98 CR3: 00000000221cc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> setup_extent_mapping fs/btrfs/extent_map.c:467 [inline] add_extent_mapping+0x604/0xa50 fs/btrfs/extent_map.c:500 btrfs_add_extent_mapping+0x10e/0x7b0 fs/btrfs/extent_map.c:712 btrfs_get_extent+0x124b/0x1d30 fs/btrfs/inode.c:6962 btrfs_cont_expand+0x28f/0xcd0 fs/btrfs/inode.c:4923 btrfs_write_check+0x440/0x590 fs/btrfs/file.c:1181 btrfs_direct_write+0x2f1/0xb40 fs/btrfs/direct-io.c:818 btrfs_do_write_iter+0x2a1/0x760 fs/btrfs/file.c:1505 do_iter_readv_writev+0x60a/0x890 vfs_writev+0x37c/0xbb0 fs/read_write.c:971 do_pwritev fs/read_write.c:1072 [inline] __do_sys_pwritev2 fs/read_write.c:1131 [inline] __se_sys_pwritev2+0x1ca/0x2d0 fs/read_write.c:1122 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c73579e79 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6c742e8038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148 RAX: ffffffffffffffda RBX: 00007f6c73716058 RCX: 00007f6c73579e79 RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000004 RBP: 00007f6c735e793e R08: 0000000000000000 R09: 0000000000000003 R10: 0000000000002000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f6c73716058 R15: 00007ffed77574b8 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:extent_map_block_start fs/btrfs/extent_map.h:154 [inline] RIP: 0010:try_merge_map+0x684/0x8e0 fs/btrfs/extent_map.c:387 Code: 19 e8 a0 f9 e1 fd 48 8b 2c 24 eb 0e e8 95 f9 e1 fd 48 8b 2c 24 4c 8b 64 24 10 48 83 c5 28 48 89 e8 48 c1 e8 03 48 89 44 24 20 <42> 80 3c 38 00 74 08 48 89 ef e8 4d 16 46 fe 48 89 6c 24 18 48 8b RSP: 0018:ffffc90008e8f2c0 EFLAGS: 00010206 RAX: 0000000000000005 RBX: ffff88802539cdc8 RCX: ffff88802b4e0000 RDX: 0000000000000000 RSI: fffffffffffffffd RDI: fffffffffffffffc RBP: 0000000000000028 R08: ffffffff83b19139 R09: 1ffff11004a739c3 R10: dffffc0000000000 R11: ffffed1004a739c4 R12: fffffffffffffffd R13: ffff88802539ce18 R14: 1ffff11004a739c3 R15: dffffc0000000000 FS: 00007f6c742e86c0(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f6c742e7f98 CR3: 00000000221cc000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e8 a0 f9 e1 fd call 0xfde1f9a5 5: 48 8b 2c 24 mov (%rsp),%rbp 9: eb 0e jmp 0x19 b: e8 95 f9 e1 fd call 0xfde1f9a5 10: 48 8b 2c 24 mov (%rsp),%rbp 14: 4c 8b 64 24 10 mov 0x10(%rsp),%r12 19: 48 83 c5 28 add $0x28,%rbp 1d: 48 89 e8 mov %rbp,%rax 20: 48 c1 e8 03 shr $0x3,%rax 24: 48 89 44 24 20 mov %rax,0x20(%rsp) * 29: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 ef mov %rbp,%rdi 33: e8 4d 16 46 fe call 0xfe461685 38: 48 89 6c 24 18 mov %rbp,0x18(%rsp) 3d: 48 rex.W 3e: 8b .byte 0x8b Tested on: commit: d5d547aa Merge tag 'random-6.11-rc6-for-linus' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1162fc35980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a0455552d0b27491 dashboard link: https://syzkaller.appspot.com/bug?extid=ba3c0273042a898c230e compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=1166fa0b980000
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