syzbot has found a reproducer for the following issue on: HEAD commit: c964ced77262 Merge tag 'for-linus' of git://git.kernel.org.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1575f45f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407 dashboard link: https://syzkaller.appspot.com/bug?extid=748cc361874fca7d33cc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10561830580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120c8240580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c964ced7.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e937ef58569a/vmlinux-c964ced7.xz kernel image: https://storage.googleapis.com/syzbot-assets/f1df9880ca4b/bzImage-c964ced7.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/33caeecf49f6/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+748cc361874fca7d33cc@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 74 at fs/ext4/inode.c:5195 ext4_write_inode+0x627/0x6f0 fs/ext4/inode.c:5195 Modules linked in: CPU: 0 UID: 0 PID: 74 Comm: kswapd0 Not tainted 6.12.0-rc3-syzkaller-00087-gc964ced77262 #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:ext4_write_inode+0x627/0x6f0 fs/ext4/inode.c:5195 Code: ff ff ff 4d 85 ff 74 12 e8 16 38 34 ff 4c 89 ff e8 0e 7d c2 ff e9 cf fd ff ff e8 04 38 34 ff e9 c5 fd ff ff e8 fa 37 34 ff 90 <0f> 0b 90 e9 b7 fd ff ff e8 ec 37 34 ff e9 76 fd ff ff 44 89 f1 80 RSP: 0018:ffffc90000e46e20 EFLAGS: 00010293 RAX: ffffffff8260af56 RBX: 0000000000000800 RCX: ffff88801eea2440 RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000000000000000 RBP: ffffc90000e46f20 R08: ffffffff8260a9f2 R09: 1ffffffff2039fcd R10: dffffc0000000000 R11: ffffffff8260a930 R12: 0000000000220840 R13: 1ffff920001c8dc8 R14: 0000000000000000 R15: ffff88801eea2440 FS: 0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fbfc77f1af8 CR3: 000000000e734000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> write_inode fs/fs-writeback.c:1503 [inline] __writeback_single_inode+0x711/0x10d0 fs/fs-writeback.c:1723 writeback_single_inode+0x1f3/0x660 fs/fs-writeback.c:1779 write_inode_now+0x1dd/0x260 fs/fs-writeback.c:2829 iput_final fs/inode.c:1864 [inline] iput+0x60d/0xa50 fs/inode.c:1903 __dentry_kill+0x20d/0x630 fs/dcache.c:615 shrink_kill+0xa9/0x2c0 fs/dcache.c:1060 shrink_dentry_list+0x2c0/0x5b0 fs/dcache.c:1087 prune_dcache_sb+0x10f/0x180 fs/dcache.c:1168 super_cache_scan+0x34f/0x4b0 fs/super.c:221 do_shrink_slab+0x701/0x1160 mm/shrinker.c:435 shrink_slab+0x1093/0x14d0 mm/shrinker.c:662 shrink_one+0x43b/0x850 mm/vmscan.c:4818 shrink_many mm/vmscan.c:4879 [inline] lru_gen_shrink_node mm/vmscan.c:4957 [inline] shrink_node+0x3799/0x3de0 mm/vmscan.c:5937 kswapd_shrink_node mm/vmscan.c:6765 [inline] balance_pgdat mm/vmscan.c:6957 [inline] kswapd+0x1ca3/0x3700 mm/vmscan.c:7226 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> --- 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.
