Hello, syzbot found the following issue on: HEAD commit: c0b832517f62 Add linux-next specific files for 20240402 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=12d5def9180000 kernel config: https://syzkaller.appspot.com/x/.config?x=afcaf46d374cec8c dashboard link: https://syzkaller.appspot.com/bug?extid=beb5226eef6218124e9d 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=1155ccc5180000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14b06795180000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0d36ec76edc7/disk-c0b83251.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/6f9bb4e37dd0/vmlinux-c0b83251.xz kernel image: https://storage.googleapis.com/syzbot-assets/2349287b14b7/bzImage-c0b83251.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+beb5226eef6218124e9d@xxxxxxxxxxxxxxxxxxxxxxxxx ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 ------------[ cut here ]------------ kernel BUG at include/linux/mm.h:1135! Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 12 Comm: kworker/u8:1 Not tainted 6.9.0-rc2-next-20240402-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Workqueue: events_unbound io_ring_exit_work RIP: 0010:put_page_testzero include/linux/mm.h:1135 [inline] RIP: 0010:folio_put_testzero include/linux/mm.h:1141 [inline] RIP: 0010:folio_put include/linux/mm.h:1508 [inline] RIP: 0010:put_page include/linux/mm.h:1581 [inline] RIP: 0010:__io_remove_buffers+0x8ee/0x8f0 io_uring/kbuf.c:196 Code: ff fb ff ff 48 c7 c7 3c 68 a9 8f e8 fc b6 56 fd e9 ee fb ff ff e8 12 dc f1 fc 48 89 ef 48 c7 c6 60 ff 1e 8c e8 13 20 3b fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa RSP: 0018:ffffc90000117830 EFLAGS: 00010246 RAX: 12798bbc5474ca00 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: 0000000000000001 RBP: ffffea0000880c40 R08: ffffffff92f3a5ef R09: 1ffffffff25e74bd R10: dffffc0000000000 R11: fffffbfff25e74be R12: 0000000000000008 R13: 0000000000000002 R14: ffff88802d20d280 R15: ffffea0000880c74 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200020c4 CR3: 000000007d97a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> io_put_bl io_uring/kbuf.c:229 [inline] io_destroy_buffers+0x14e/0x490 io_uring/kbuf.c:243 io_ring_ctx_free+0x818/0xe70 io_uring/io_uring.c:2710 io_ring_exit_work+0x7c7/0x850 io_uring/io_uring.c:2941 process_one_work kernel/workqueue.c:3218 [inline] process_scheduled_works+0xa2c/0x1830 kernel/workqueue.c:3299 worker_thread+0x86d/0xd70 kernel/workqueue.c:3380 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:put_page_testzero include/linux/mm.h:1135 [inline] RIP: 0010:folio_put_testzero include/linux/mm.h:1141 [inline] RIP: 0010:folio_put include/linux/mm.h:1508 [inline] RIP: 0010:put_page include/linux/mm.h:1581 [inline] RIP: 0010:__io_remove_buffers+0x8ee/0x8f0 io_uring/kbuf.c:196 Code: ff fb ff ff 48 c7 c7 3c 68 a9 8f e8 fc b6 56 fd e9 ee fb ff ff e8 12 dc f1 fc 48 89 ef 48 c7 c6 60 ff 1e 8c e8 13 20 3b fd 90 <0f> 0b 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa RSP: 0018:ffffc90000117830 EFLAGS: 00010246 RAX: 12798bbc5474ca00 RBX: 0000000000000000 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: ffffffff8bcad5c0 RDI: 0000000000000001 RBP: ffffea0000880c40 R08: ffffffff92f3a5ef R09: 1ffffffff25e74bd R10: dffffc0000000000 R11: fffffbfff25e74be R12: 0000000000000008 R13: 0000000000000002 R14: ffff88802d20d280 R15: ffffea0000880c74 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f31a71870f0 CR3: 000000007930c000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title 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. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
