linux-kernel - [syzbot] [bcachefs?] kernel BUG in bch2_btree_path_peek

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Message-ID: <6749afb0.050a0220.253251.00b2.GAE@google.com>
Date: Fri, 29 Nov 2024 04:12:32 -0800
From: syzbot <syzbot+3ebaf90b49bd97e920ee@...kaller.appspotmail.com>
To: kent.overstreet@...ux.dev, linux-bcachefs@...r.kernel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bcachefs?] kernel BUG in bch2_btree_path_peek_slot

Hello,

syzbot found the following issue on:

HEAD commit:    65ae975e97d5 Merge tag 'net-6.13-rc1' of git://git.kernel...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14794d30580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=3891b550f14aea0f
dashboard link: https://syzkaller.appspot.com/bug?extid=3ebaf90b49bd97e920ee
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-65ae975e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/53fd215a7a86/vmlinux-65ae975e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/589c729ff0b2/bzImage-65ae975e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3ebaf90b49bd97e920ee@...kaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/bcachefs/btree_iter.c:1816!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 4683 Comm: kworker/u5:1 Not tainted 6.12.0-syzkaller-10681-g65ae975e97d5 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: bcachefs bch2_write_point_do_index_updates
RIP: 0010:bch2_btree_path_peek_slot+0xf50/0xf90 fs/bcachefs/btree_iter.c:1816
Code: f7 ff ff 48 89 34 24 be 08 00 00 00 44 89 44 24 08 e8 c4 fa e3 fd 48 8b 34 24 44 8b 44 24 08 e9 50 f7 ff ff e8 51 12 79 fd 90 <0f> 0b e8 49 12 79 fd 90 0f 0b e8 21 4a b6 07 e8 3c 12 79 fd 90 0f
RSP: 0018:ffffc9000de4c0a0 EFLAGS: 00010293
RAX: ffffffff841cd22f RBX: 0000000000002164 RCX: ffff88801f290000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc9000de4c1b0 R08: ffffffff841cc410 R09: 0000000000000000
R10: ffffc9000de4c300 R11: fffff52001bc9862 R12: dffffc0000000000
R13: 1ffff1100adc228d R14: ffff888056e11448 R15: 1ffff1100adc228c
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0e030d38 CR3: 000000004f5d2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bch2_btree_iter_peek_slot+0xa2f/0x2550 fs/bcachefs/btree_iter.c:2658
 __bch2_bkey_get_iter fs/bcachefs/btree_iter.h:575 [inline]
 bch2_bkey_get_iter fs/bcachefs/btree_iter.h:589 [inline]
 try_alloc_bucket fs/bcachefs/alloc_foreground.c:305 [inline]
 bch2_bucket_alloc_freelist fs/bcachefs/alloc_foreground.c:525 [inline]
 bch2_bucket_alloc_trans+0x1997/0x3a50 fs/bcachefs/alloc_foreground.c:648
 bch2_bucket_alloc_set_trans+0x517/0xd30 fs/bcachefs/alloc_foreground.c:808
 __open_bucket_add_buckets+0x13d0/0x1ec0 fs/bcachefs/alloc_foreground.c:1057
 open_bucket_add_buckets+0x33a/0x410 fs/bcachefs/alloc_foreground.c:1101
 bch2_alloc_sectors_start_trans+0xce9/0x2030
 __bch2_btree_node_alloc fs/bcachefs/btree_update_interior.c:339 [inline]
 bch2_btree_reserve_get+0x612/0x1890 fs/bcachefs/btree_update_interior.c:549
 bch2_btree_update_start+0xe56/0x14e0 fs/bcachefs/btree_update_interior.c:1247
 bch2_btree_split_leaf+0x123/0x840 fs/bcachefs/btree_update_interior.c:1856
 bch2_trans_commit_error+0x212/0x1390 fs/bcachefs/btree_trans_commit.c:942
 __bch2_trans_commit+0x7ead/0x93c0 fs/bcachefs/btree_trans_commit.c:1140
 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline]
 btree_key_cache_flush_pos fs/bcachefs/btree_key_cache.c:432 [inline]
 bch2_btree_key_cache_journal_flush+0x97d/0xe70 fs/bcachefs/btree_key_cache.c:512
 journal_flush_pins+0x5f7/0xb20 fs/bcachefs/journal_reclaim.c:565
 __bch2_journal_reclaim+0x789/0xdc0 fs/bcachefs/journal_reclaim.c:698
 __journal_res_get+0x1de3/0x2670 fs/bcachefs/journal.c:581
 bch2_journal_res_get_slowpath+0xe6/0x710 fs/bcachefs/journal.c:606
 bch2_journal_res_get fs/bcachefs/journal.h:382 [inline]
 bch2_trans_journal_res_get fs/bcachefs/btree_trans_commit.c:350 [inline]
 bch2_trans_commit_error+0xd91/0x1390 fs/bcachefs/btree_trans_commit.c:962
 __bch2_trans_commit+0x7ead/0x93c0 fs/bcachefs/btree_trans_commit.c:1140
 bch2_trans_commit fs/bcachefs/btree_update.h:184 [inline]
 __bch2_data_update_index_update+0x56bb/0x77f0 fs/bcachefs/data_update.c:368
 bch2_data_update_index_update+0x63/0x90 fs/bcachefs/data_update.c:414
 __bch2_write_index+0x16d1/0x2140 fs/bcachefs/io_write.c:527
 bch2_write_point_do_index_updates+0x32e/0x690 fs/bcachefs/io_write.c:635
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:bch2_btree_path_peek_slot+0xf50/0xf90 fs/bcachefs/btree_iter.c:1816
Code: f7 ff ff 48 89 34 24 be 08 00 00 00 44 89 44 24 08 e8 c4 fa e3 fd 48 8b 34 24 44 8b 44 24 08 e9 50 f7 ff ff e8 51 12 79 fd 90 <0f> 0b e8 49 12 79 fd 90 0f 0b e8 21 4a b6 07 e8 3c 12 79 fd 90 0f
RSP: 0018:ffffc9000de4c0a0 EFLAGS: 00010293
RAX: ffffffff841cd22f RBX: 0000000000002164 RCX: ffff88801f290000
RDX: 0000000000000000 RSI: 0000000000000100 RDI: 0000000000000000
RBP: ffffc9000de4c1b0 R08: ffffffff841cc410 R09: 0000000000000000
R10: ffffc9000de4c300 R11: fffff52001bc9862 R12: dffffc0000000000
R13: 1ffff1100adc228d R14: ffff888056e11448 R15: 1ffff1100adc228c
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe0e030d38 CR3: 000000004f5d2000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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