[syzbot] [reiserfs?] kernel panic: corrupted stack end in do_sys_ftruncate

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a92b7d26c743 Merge tag 'drm-fixes-2023-06-23' of git://ano..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17455d57280000
kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=3e32db5854a2dc0011ff
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a44d50a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bee4cb280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/53d1be238f30/disk-a92b7d26.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/04748ac79920/vmlinux-a92b7d26.xz
kernel image: https://storage.googleapis.com/syzbot-assets/78634d05a96b/bzImage-a92b7d26.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1afab00be7e0/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3e32db...@syzkaller.appspotmail.com

REISERFS (device loop0): Created .reiserfs_priv - reserved for xattr storage.
Kernel panic - not syncing: corrupted stack end detected inside scheduler
CPU: 1 PID: 4994 Comm: syz-executor351 Not tainted 6.4.0-rc7-syzkaller-00226-ga92b7d26c743 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106
panic+0x686/0x730 kernel/panic.c:340
schedule_debug kernel/sched/core.c:5905 [inline]
__schedule+0x5055/0x5880 kernel/sched/core.c:6563
preempt_schedule_irq+0x52/0x90 kernel/sched/core.c:6981
irqentry_exit+0x35/0x80 kernel/entry/common.c:433
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
RIP: 0010:memmove+0x4b/0x1b0 arch/x86/lib/memmove_64.S:68
Code: 01 01 00 00 0f 1f 44 00 00 48 81 fa a8 02 00 00 72 05 40 38 fe 74 48 48 83 ea 20 48 83 ea 20 4c 8b 1e 4c 8b 56 08 4c 8b 4e 10 <4c> 8b 46 18 48 8d 76 20 4c 89 1f 4c 89 57 08 4c 89 4f 10 4c 89 47
RSP: 0018:ffffc9000390ef90 EFLAGS: 00000282
RAX: ffff8880734b1030 RBX: 0000000000000000 RCX: 0000000000000000
RDX: fffffffff67b3789 RSI: ffff88807ccfe700 RDI: ffff88807ccfd730
RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000fd0 R14: ffff8880734b10d8 R15: 0000000000000008
leaf_paste_in_buffer+0x270/0xc30 fs/reiserfs/lbalance.c:1017
balance_leaf_new_nodes_paste_whole fs/reiserfs/do_balan.c:1171 [inline]
balance_leaf_new_nodes_paste fs/reiserfs/do_balan.c:1215 [inline]
balance_leaf_new_nodes fs/reiserfs/do_balan.c:1246 [inline]
balance_leaf+0x29c5/0xddc0 fs/reiserfs/do_balan.c:1450
do_balance+0x319/0x810 fs/reiserfs/do_balan.c:1888
reiserfs_paste_into_item+0x74b/0x8d0 fs/reiserfs/stree.c:2157
reiserfs_get_block+0x165c/0x4100 fs/reiserfs/inode.c:1069
__block_write_begin_int+0x3bd/0x14b0 fs/buffer.c:2064
reiserfs_write_begin+0x36e/0xa60 fs/reiserfs/inode.c:2773
generic_cont_expand_simple+0x117/0x1f0 fs/buffer.c:2425
reiserfs_setattr+0x395/0x1370 fs/reiserfs/inode.c:3303
notify_change+0xb2c/0x1180 fs/attr.c:483
do_truncate+0x143/0x200 fs/open.c:66
do_sys_ftruncate+0x53a/0x770 fs/open.c:194
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa89d7102b9
Code: eb ff ff 44 89 25 77 1e 07 00 48 8b 45 90 48 89 05 2c 43 07 00 48 8b 45 c8 64 48 2b 04 25 28 00 00 00 0f 85 1f 01 00 00 48 8d <65> d8 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 0f 1f 80 00 00 00
RSP: 002b:00007ffc8f2c2e78 EFLAGS: 00000246 ORIG_RAX: 000000000000004d
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa89d7102b9
RDX: 00007fa89d7102b9 RSI: 0000000002007fff RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 00007ffc8f2c2ea0
R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000
</TASK>
Kernel Offset: disabled
Rebooting in 86400 seconds..
----------------
Code disassembly (best guess):
0: 01 01 add %eax,(%rcx)
2: 00 00 add %al,(%rax)
4: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
9: 48 81 fa a8 02 00 00 cmp $0x2a8,%rdx
10: 72 05 jb 0x17
12: 40 38 fe cmp %dil,%sil
15: 74 48 je 0x5f
17: 48 83 ea 20 sub $0x20,%rdx
1b: 48 83 ea 20 sub $0x20,%rdx
1f: 4c 8b 1e mov (%rsi),%r11
22: 4c 8b 56 08 mov 0x8(%rsi),%r10
26: 4c 8b 4e 10 mov 0x10(%rsi),%r9
* 2a: 4c 8b 46 18 mov 0x18(%rsi),%r8 <-- trapping instruction
2e: 48 8d 76 20 lea 0x20(%rsi),%rsi
32: 4c 89 1f mov %r11,(%rdi)
35: 4c 89 57 08 mov %r10,0x8(%rdi)
39: 4c 89 4f 10 mov %r9,0x10(%rdi)
3d: 4c rex.WR
3e: 89 .byte 0x89
3f: 47 rex.RXB


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[syzbot]

syzbot suspects this issue was fixed by commit:

commit 6f861765464f43a71462d52026fbddfc858239a5
Author: Jan Kara <ja...@suse.cz>
Date: Wed Nov 1 17:43:10 2023 +0000

fs: Block writes to mounted block devices

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12203874180000
start commit: a92b7d26c743 Merge tag 'drm-fixes-2023-06-23' of git://ano..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=2cbd298d0aff1140
dashboard link: https://syzkaller.appspot.com/bug?extid=3e32db5854a2dc0011ff

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a44d50a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10bee4cb280000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: fs: Block writes to mounted block devices

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[syzbot]

Auto-closing this bug as obsolete.
No recent activity, existing reproducers are no longer triggering the issue.