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Message-ID: <670ba885.050a0220.4cbc0.002e.GAE@google.com> Date: Sun, 13 Oct 2024 04:01:25 -0700 From: syzbot <syzbot+8cb2efaaad483f65f56c@...kaller.appspotmail.com> To: akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, syzkaller-bugs@...glegroups.com, willy@...radead.org Subject: [syzbot] [fs?] [mm?] stack segment fault in folio_wait_writeback Hello, syzbot found the following issue on: HEAD commit: 7234e2ea0edd Merge tag 'scsi-fixes' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=157a085f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=7cd9e7e4a8a0a15b dashboard link: https://syzkaller.appspot.com/bug?extid=8cb2efaaad483f65f56c 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=146c7fd0580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-7234e2ea.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa111520a0b7/vmlinux-7234e2ea.xz kernel image: https://storage.googleapis.com/syzbot-assets/07889fadba3b/bzImage-7234e2ea.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/178fe4a5f5e7/mount_1.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/7847e1862894/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8cb2efaaad483f65f56c@...kaller.appspotmail.com loop0: detected capacity change from 0 to 256 exFAT-fs (loop0): failed to load upcase table (idx : 0x00010000, chksum : 0xcc9b7de9, utbl_chksum : 0xe619d30d) Oops: stack segment: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5340 Comm: syz.0.50 Not tainted 6.12.0-rc2-syzkaller-00305-g7234e2ea0edd #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:PageTail include/linux/page-flags.h:281 [inline] RIP: 0010:const_folio_flags include/linux/page-flags.h:309 [inline] RIP: 0010:folio_test_writeback include/linux/page-flags.h:555 [inline] RIP: 0010:folio_wait_writeback+0x2f/0x1e0 mm/page-writeback.c:3187 Code: 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 ac 7e c4 ff 4c 8d 73 08 4c 89 f5 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 f7 e8 11 2f 2e 00 4d 8b 3e 4c 89 fe RSP: 0018:ffffc900025a7190 EFLAGS: 00010202 RAX: ffffffff81d068a4 RBX: 0000000000000000 RCX: ffff888000c3c880 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff81cc460e R09: 1ffffd4000003328 R10: dffffc0000000000 R11: fffff94000003329 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000008 R15: 0000000000000001 FS: 00007f7a897816c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7a88a75c60 CR3: 000000003f406000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __filemap_fdatawait_range+0x17c/0x2b0 mm/filemap.c:533 file_write_and_wait_range+0x1e3/0x280 mm/filemap.c:792 __generic_file_fsync+0x6f/0x1a0 fs/libfs.c:1528 exfat_file_fsync+0xf9/0x1d0 fs/exfat/file.c:524 exfat_file_write_iter+0x312/0x3f0 fs/exfat/file.c:608 iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743 do_splice_from fs/splice.c:941 [inline] direct_splice_actor+0x11b/0x220 fs/splice.c:1164 splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108 do_splice_direct_actor fs/splice.c:1207 [inline] do_splice_direct+0x289/0x3e0 fs/splice.c:1233 do_sendfile+0x561/0xe10 fs/read_write.c:1388 __do_sys_sendfile64 fs/read_write.c:1455 [inline] __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1441 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: 0033:0x7f7a8897dff9 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:00007f7a89781038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f7a88b35f80 RCX: 00007f7a8897dff9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004 RBP: 00007f7a889f0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000100001 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f7a88b35f80 R15: 00007fffbdf78608 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:PageTail include/linux/page-flags.h:281 [inline] RIP: 0010:const_folio_flags include/linux/page-flags.h:309 [inline] RIP: 0010:folio_test_writeback include/linux/page-flags.h:555 [inline] RIP: 0010:folio_wait_writeback+0x2f/0x1e0 mm/page-writeback.c:3187 Code: 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb 49 bd 00 00 00 00 00 fc ff df e8 ac 7e c4 ff 4c 8d 73 08 4c 89 f5 48 c1 ed 03 <42> 80 7c 2d 00 00 74 08 4c 89 f7 e8 11 2f 2e 00 4d 8b 3e 4c 89 fe RSP: 0018:ffffc900025a7190 EFLAGS: 00010202 RAX: ffffffff81d068a4 RBX: 0000000000000000 RCX: ffff888000c3c880 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff81cc460e R09: 1ffffd4000003328 R10: dffffc0000000000 R11: fffff94000003329 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000008 R15: 0000000000000001 FS: 00007f7a897816c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7a8975ff98 CR3: 000000003f406000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 57 push %r15 2: 41 56 push %r14 4: 41 55 push %r13 6: 41 54 push %r12 8: 53 push %rbx 9: 48 83 ec 18 sub $0x18,%rsp d: 48 89 fb mov %rdi,%rbx 10: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 17: fc ff df 1a: e8 ac 7e c4 ff call 0xffc47ecb 1f: 4c 8d 73 08 lea 0x8(%rbx),%r14 23: 4c 89 f5 mov %r14,%rbp 26: 48 c1 ed 03 shr $0x3,%rbp * 2a: 42 80 7c 2d 00 00 cmpb $0x0,0x0(%rbp,%r13,1) <-- trapping instruction 30: 74 08 je 0x3a 32: 4c 89 f7 mov %r14,%rdi 35: e8 11 2f 2e 00 call 0x2e2f4b 3a: 4d 8b 3e mov (%r14),%r15 3d: 4c 89 fe mov %r15,%rsi --- 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 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
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