syzbot has found a reproducer for the following issue on: HEAD commit: 5f5673607153 Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=11e69c27980000 kernel config: https://syzkaller.appspot.com/x/.config?x=dedbcb1ff4387972 dashboard link: https://syzkaller.appspot.com/bug?extid=247ac87eabcb1f8fa990 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14a57480580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e69c27980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/40172aed5414/disk-5f567360.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/58372f305e9d/vmlinux-5f567360.xz kernel image: https://storage.googleapis.com/syzbot-assets/d2aae6fa798f/Image-5f567360.gz.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/b790e8eefcc7/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/47201b805f63/mount_1.gz The issue was bisected to: commit 03ef80b469d5d83530ce1ce15be78a40e5300f9b Author: Kent Overstreet <kent.overstreet@xxxxxxxxx> Date: Sat Sep 23 22:41:51 2023 +0000 bcachefs: Ignore unknown mount options bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=1077cf8a980000 final oops: https://syzkaller.appspot.com/x/report.txt?x=1277cf8a980000 console output: https://syzkaller.appspot.com/x/log.txt?x=1477cf8a980000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+247ac87eabcb1f8fa990@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 03ef80b469d5 ("bcachefs: Ignore unknown mount options") ------------[ cut here ]------------ truncate spotted in mem i_size < btree i_size: 1 < 57344 WARNING: CPU: 0 PID: 6420 at fs/bcachefs/fs-io.c:447 bchfs_truncate+0x988/0xab0 fs/bcachefs/fs-io.c:444 Modules linked in: CPU: 0 UID: 0 PID: 6420 Comm: syz-executor335 Not tainted 6.11.0-rc7-syzkaller-g5f5673607153 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : bchfs_truncate+0x988/0xab0 fs/bcachefs/fs-io.c:444 lr : bchfs_truncate+0x988/0xab0 fs/bcachefs/fs-io.c:444 sp : ffff8000a4467300 x29: ffff8000a4467500 x28: ffff0000de380000 x27: 000000000000e000 x26: ffff0000de748da0 x25: dfff800000000000 x24: ffff70001488ce74 x23: 1fffe0001bce91b4 x22: ffff0000de748ca0 x21: ffff0000de3ca380 x20: ffff8000927b7000 x19: ffff0000de748760 x18: 0000000000000008 x17: 0000000000000000 x16: ffff800083032784 x15: 0000000000000001 x14: 1fffe000366d325a x13: 0000000000000000 x12: 0000000000000000 x11: 0000000000000002 x10: 0000000000ff0100 x9 : ab59bfad62359900 x8 : ab59bfad62359900 x7 : 0000000000000001 x6 : 0000000000000001 x5 : ffff8000a4466a58 x4 : ffff80008f65b620 x3 : ffff8000806051a0 x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000 Call trace: bchfs_truncate+0x988/0xab0 fs/bcachefs/fs-io.c:444 bch2_setattr+0x198/0x230 fs/bcachefs/fs.c:942 notify_change+0x9f0/0xca0 fs/attr.c:503 do_truncate+0x1c0/0x28c fs/open.c:65 handle_truncate fs/namei.c:3381 [inline] do_open fs/namei.c:3731 [inline] path_openat+0x2388/0x29f8 fs/namei.c:3886 do_filp_open+0x1bc/0x3cc fs/namei.c:3913 do_sys_openat2+0x124/0x1b8 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1442 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 irq event stamp: 140 hardirqs last enabled at (139): [<ffff800080388420>] __up_console_sem kernel/printk/printk.c:341 [inline] hardirqs last enabled at (139): [<ffff800080388420>] __console_unlock kernel/printk/printk.c:2801 [inline] hardirqs last enabled at (139): [<ffff800080388420>] console_unlock+0x18c/0x3d4 kernel/printk/printk.c:3120 hardirqs last disabled at (140): [<ffff80008b3363f4>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:470 softirqs last enabled at (8): [<ffff8000800307f8>] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (6): [<ffff8000800307c4>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- --- 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.
