syzbot

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kernel BUG at fs/reiserfs/journal.c:505!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 5931 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:reiserfs_in_journal+0xa4e/0xa50 fs/reiserfs/journal.c:505
Code: 24 30 80 e2 07 80 c2 03 38 ca 0f 8c 73 fe ff ff 48 8b 7c 24 30 48 89 c3 e8 5f e7 b5 ff 48 89 d8 e9 5e fe ff ff e8 b2 a6 5d ff <0f> 0b 66 0f 1f 00 55 41 57 41 56 41 55 41 54 53 50 49 89 fc 48 bd
RSP: 0018:ffffc90002d46668 EFLAGS: 00010293
RAX: ffffffff822984de RBX: ffff88807a11c000 RCX: ffff88807a4a0000
RDX: 0000000000000000 RSI: 0000000000000213 RDI: 0000000000000213
RBP: ffff88807a11c630 R08: ffffc90002d467a0 R09: 1ffff1100b843208
R10: dffffc0000000000 R11: ffffed100b843209 R12: ffffc9000332b048
R13: ffffc9000332b050 R14: dffffc0000000000 R15: 0000000000000213
FS:  0000555566aca500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffe70 CR3: 0000000075a6d000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 is_block_in_journal fs/reiserfs/bitmap.c:125 [inline]
 scan_bitmap_block+0x4ad/0xe00 fs/reiserfs/bitmap.c:203
 scan_bitmap fs/reiserfs/bitmap.c:408 [inline]
 allocate_without_wrapping_disk fs/reiserfs/bitmap.c:1161 [inline]
 blocknrs_and_prealloc_arrays_from_search_start fs/reiserfs/bitmap.c:1274 [inline]
 reiserfs_allocate_blocknrs+0x298c/0x4e80 fs/reiserfs/bitmap.c:1375
 reiserfs_new_unf_blocknrs2 fs/reiserfs/reiserfs.h:3378 [inline]
 _allocate_block fs/reiserfs/inode.c:641 [inline]
 reiserfs_get_block+0x263a/0x4060 fs/reiserfs/inode.c:756
 __block_write_begin_int+0x57f/0x1af0 fs/buffer.c:2124
 reiserfs_write_begin+0x20a/0x4c0 fs/reiserfs/inode.c:2771
 generic_perform_write+0x2fe/0x5c0 mm/filemap.c:4036
 generic_file_write_iter+0xaf/0x2e0 mm/filemap.c:4157
 __kernel_write_iter+0x28c/0x690 fs/read_write.c:517
 dump_emit_page fs/coredump.c:957 [inline]
 dump_user_range+0x420/0x860 fs/coredump.c:984
 elf_core_dump+0x31d0/0x3770 fs/binfmt_elf.c:2184
 do_coredump+0x17cc/0x24d0 fs/coredump.c:833
 get_signal+0x1133/0x13f0 kernel/signal.c:2888
 arch_do_signal_or_restart+0xc2/0x800 arch/x86/kernel/signal.c:310
 exit_to_user_mode_loop+0x70/0x110 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x30 kernel/entry/common.c:315
 exc_page_fault+0x8c/0x100 arch/x86/mm/fault.c:1519
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f501d19ce61
Code: 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffe70 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f501d415fa0 RCX: 00007f501d19ce59
RDX: 0000000000000000 RSI: fffffffffffffe70 RDI: 0000000000008000
RBP: 00007f501d232d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f501d415fac R14: 00007f501d415fa0 R15: 00007f501d415fa0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:reiserfs_in_journal+0xa4e/0xa50 fs/reiserfs/journal.c:505
Code: 24 30 80 e2 07 80 c2 03 38 ca 0f 8c 73 fe ff ff 48 8b 7c 24 30 48 89 c3 e8 5f e7 b5 ff 48 89 d8 e9 5e fe ff ff e8 b2 a6 5d ff <0f> 0b 66 0f 1f 00 55 41 57 41 56 41 55 41 54 53 50 49 89 fc 48 bd
RSP: 0018:ffffc90002d46668 EFLAGS: 00010293
RAX: ffffffff822984de RBX: ffff88807a11c000 RCX: ffff88807a4a0000
RDX: 0000000000000000 RSI: 0000000000000213 RDI: 0000000000000213
RBP: ffff88807a11c630 R08: ffffc90002d467a0 R09: 1ffff1100b843208
R10: dffffc0000000000 R11: ffffed100b843209 R12: ffffc9000332b048
R13: ffffc9000332b050 R14: dffffc0000000000 R15: 0000000000000213
FS:  0000555566aca500(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2ee1c2000 CR3: 0000000075a6d000 CR4: 00000000003506f0