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kernel BUG in iov_iter_revert (2)

Status: upstream: reported C repro on 2024/10/31 13:07
Subsystems: netfs
[Documentation on labels]
Reported-by: syzbot+404b4b745080b6210c6c@syzkaller.appspotmail.com
First crash: 39d, last: 2d18h
Cause bisection: introduced by (bisect log) :
commit 3b97c3652d9128ab7f8c9b8adec6108611fdb153
Author: Joanne Koong <joannelkoong@gmail.com>
Date: Thu Oct 24 17:18:08 2024 +0000

  fuse: convert direct io to use folios

Crash: kernel BUG in iov_iter_revert (log)
Repro: C syz .config
  
▶ ▼ Discussions (6)
Title Replies (including bot) Last reply
Re: Possible locking bug in the block layer [was syzbot: Re: [syzbot] [netfs?] kernel BUG in iov_iter_revert (2)] 3 (3) 2024/12/05 11:19
[syzbot] [netfs?] kernel BUG in iov_iter_revert (2) 4 (11) 2024/12/05 09:59
Re: Possible locking bug in the block layer [was syzbot: Re: [syzbot] [netfs?] kernel BUG in iov_iter_revert (2)] 1 (1) 2024/12/05 04:48
[PATCH v2] netfs: fix kernel BUG in iov_iter_revert() 6 (6) 2024/12/04 14:03
[syzbot] Monthly netfs report (Nov 2024) 0 (1) 2024/11/21 09:50
[PATCH] netfs: fix kernel BUG in iov_iter_revert() 1 (1) 2024/11/01 16:15
▶ ▼ Similar bugs (1)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream kernel BUG in iov_iter_revert exfat C done 5 304d 323d 25/28 fixed on 2024/03/28 13:35
▶ ▼ Last patch testing requests (8)
Created Duration User Patch Repo Result
2024/12/05 09:39 19m dhowells@redhat.com patch https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git for-6.14/block OK log
2024/12/04 14:11 19m dhowells@redhat.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.13-rc1 report log
2024/12/04 13:59 19m dhowells@redhat.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git v6.13-rc1 OK log
2024/12/02 09:01 19m dmantipov@yandex.ru patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git e70140ba0d2b1a30467d4af6bcfe761327b9ec95 OK log
2024/11/10 15:38 13m retest repro upstream report log
2024/11/10 15:38 13m retest repro upstream report log
2024/11/10 15:38 13m retest repro upstream report log
2024/11/01 14:37 19m dmantipov@yandex.ru patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6c52d4da1c742cd01a797a4d0a2d3c5a60dc9bfe OK log

Sample crash report:
R10: 0000000000000002 R11: 0000000000000246 R12: 00007f40bfa2741c
R13: 00007ffe565206f0 R14: 00007f40bfa2a5a1 R15: 0000000000000001
 </TASK>
------------[ cut here ]------------
kernel BUG at lib/iov_iter.c:624!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5311 Comm: syz-executor145 Not tainted 6.12.0-rc4-syzkaller-00261-g850925a8133c #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:iov_iter_revert+0x420/0x590 lib/iov_iter.c:624
Code: 42 80 3c 20 00 48 8b 1c 24 74 08 48 89 df e8 17 07 43 fd 4c 89 2b e9 04 01 00 00 45 85 ed 48 8b 3c 24 75 16 e8 41 48 d9 fc 90 <0f> 0b 41 83 fd 05 48 8b 3c 24 0f 84 58 01 00 00 48 89 f8 48 c1 e8
RSP: 0018:ffffc9000d09f740 EFLAGS: 00010293
RAX: ffffffff84bba22f RBX: 000000000001e098 RCX: ffff88801f03a440
RDX: 0000000000000000 RSI: ffffffff8f098180 RDI: ffff888048077cf0
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff84bb9f14
R10: 0000000000000004 R11: ffff88801f03a440 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888048077ce0 R15: fffffffffffe1f68
FS:  000055556a75b380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555bd33aafa0 CR3: 0000000041784000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 netfs_reset_iter+0xce/0x130 fs/netfs/misc.c:133
 netfs_clear_unread fs/netfs/read_collect.c:22 [inline]
 netfs_read_subreq_terminated+0x1fe/0xad0 fs/netfs/read_collect.c:491
 netfs_read_to_pagecache+0x628/0x900 fs/netfs/buffered_read.c:306
 netfs_readahead+0x7e9/0x9d0 fs/netfs/buffered_read.c:421
 read_pages+0x17e/0x840 mm/readahead.c:160
 page_cache_ra_unbounded+0x774/0x8a0 mm/readahead.c:290
 do_page_cache_ra mm/readahead.c:320 [inline]
 force_page_cache_ra+0x280/0x2f0 mm/readahead.c:349
 force_page_cache_readahead mm/internal.h:357 [inline]
 generic_fadvise+0x522/0x830 mm/fadvise.c:106
 ksys_readahead mm/readahead.c:695 [inline]
 __do_sys_readahead mm/readahead.c:703 [inline]
 __se_sys_readahead mm/readahead.c:701 [inline]
 __x64_sys_readahead+0x1ac/0x230 mm/readahead.c:701
 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: 0033:0x7f40bf9e5689
Code: 48 83 c4 28 c3 e8 17 1a 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe565206c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000bb
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f40bf9e5689
RDX: 000800000000000d RSI: 0000000000000005 RDI: 0000000000000006
RBP: 00007f40bfa273ee R08: 00007ffe56520466 R09: 0000550032313335
R10: 0000000000000002 R11: 0000000000000246 R12: 00007f40bfa2741c
R13: 00007ffe565206f0 R14: 00007f40bfa2a5a1 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:iov_iter_revert+0x420/0x590 lib/iov_iter.c:624
Code: 42 80 3c 20 00 48 8b 1c 24 74 08 48 89 df e8 17 07 43 fd 4c 89 2b e9 04 01 00 00 45 85 ed 48 8b 3c 24 75 16 e8 41 48 d9 fc 90 <0f> 0b 41 83 fd 05 48 8b 3c 24 0f 84 58 01 00 00 48 89 f8 48 c1 e8
RSP: 0018:ffffc9000d09f740 EFLAGS: 00010293
RAX: ffffffff84bba22f RBX: 000000000001e098 RCX: ffff88801f03a440
RDX: 0000000000000000 RSI: ffffffff8f098180 RDI: ffff888048077cf0
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff84bb9f14
R10: 0000000000000004 R11: ffff88801f03a440 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff888048077ce0 R15: fffffffffffe1f68
FS:  000055556a75b380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555bd33aafa0 CR3: 0000000041784000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (16):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/27 15:34 upstream 850925a8133c 65e8686b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in iov_iter_revert
2024/10/27 14:49 upstream 850925a8133c 65e8686b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in iov_iter_revert
2024/10/27 13:52 upstream 850925a8133c 65e8686b .config console log report syz / log C [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in iov_iter_revert
2024/11/28 09:33 linux-next f486c8aa16b8 5df23865 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in iov_iter_revert
2024/11/28 18:23 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root kernel BUG in iov_iter_revert
2024/11/28 17:25 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root kernel BUG in iov_iter_revert
2024/11/28 12:40 upstream b86545e02e8c 5df23865 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root kernel BUG in iov_iter_revert
2024/10/27 13:02 upstream 850925a8133c 65e8686b .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root kernel BUG in iov_iter_revert
2024/12/02 19:25 upstream e70140ba0d2b b499ea68 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/12/01 00:06 upstream d8b78066f4c9 68914665 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/12/01 00:03 upstream d8b78066f4c9 68914665 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/11/29 00:28 upstream 65ae975e97d5 5df23865 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/11/28 17:43 upstream b86545e02e8c 5df23865 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/11/27 21:33 upstream aaf20f870da0 5df23865 .config console log report info [disk image (non-bootable)] [vmlinux] [kernel image] ci-qemu-upstream-386 kernel BUG in iov_iter_revert
2024/11/26 20:50 linux-next ed9a4ad6e5bd 11dbc254 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in iov_iter_revert
2024/11/22 00:01 linux-next ac24e26aa08f 4b25d554 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root kernel BUG in iov_iter_revert
* Struck through repros no longer work on HEAD.