Hello, syzbot found the following issue on: HEAD commit: e431e712c836 Merge branch 'sfc-tc-encap-actions-offload' git tree: net-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=17e7771b280000 kernel config: https://syzkaller.appspot.com/x/.config?x=526f919910d4a671 dashboard link: https://syzkaller.appspot.com/bug?extid=4e2e47f32607d0f72d43 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12610c75280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171cdef1280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/35e2db144233/disk-e431e712.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ecf37a1cef2c/vmlinux-e431e712.xz kernel image: https://storage.googleapis.com/syzbot-assets/a3da92090562/bzImage-e431e712.xz The issue was bisected to: commit c662b043cdca89bf0f03fc37251000ac69a3a548 Author: David Howells <dhowells@xxxxxxxxxx> Date: Tue Jun 6 13:08:56 2023 +0000 crypto: af_alg/hash: Support MSG_SPLICE_PAGES bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=12392407280000 final oops: https://syzkaller.appspot.com/x/report.txt?x=11392407280000 console output: https://syzkaller.appspot.com/x/log.txt?x=16392407280000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+4e2e47f32607d0f72d43@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: c662b043cdca ("crypto: af_alg/hash: Support MSG_SPLICE_PAGES") general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.4.0-rc5-syzkaller-01107-ge431e712c836 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/25/2023 Workqueue: cryptd cryptd_queue_worker RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline] RIP: 0010:crypto_shash_finup+0x53/0x160 crypto/shash.c:198 Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 05 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 00 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b RSP: 0018:ffffc900000e7ba0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff83df35bf RDI: 0000000000000020 RBP: ffff888028350b08 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 1ffffffff218470c R12: ffff8880123fa1c0 R13: ffff888029582ac8 R14: 0000000000000014 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f251034e440 CR3: 000000007cc84000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> shash_ahash_finup+0xdf/0x3a0 crypto/shash.c:333 cryptd_hash_finup+0xce/0x120 crypto/cryptd.c:597 crypto_request_complete include/crypto/algapi.h:272 [inline] cryptd_queue_worker+0x130/0x1d0 crypto/cryptd.c:181 process_one_work+0x99a/0x15e0 kernel/workqueue.c:2405 worker_thread+0x67d/0x10c0 kernel/workqueue.c:2552 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:crypto_shash_alg include/crypto/hash.h:827 [inline] RIP: 0010:crypto_shash_finup+0x53/0x160 crypto/shash.c:198 Code: fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 05 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 5d 00 48 8d 7b 20 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d8 00 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b RSP: 0018:ffffc900000e7ba0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000004 RSI: ffffffff83df35bf RDI: 0000000000000020 RBP: ffff888028350b08 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 1ffffffff218470c R12: ffff8880123fa1c0 R13: ffff888029582ac8 R14: 0000000000000014 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f251034e440 CR3: 000000002aa8e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 3 bytes skipped: 0: 48 c1 ea 03 shr $0x3,%rdx 4: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 8: 0f 85 05 01 00 00 jne 0x113 e: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 15: fc ff df 18: 48 8b 5d 00 mov 0x0(%rbp),%rbx 1c: 48 8d 7b 20 lea 0x20(%rbx),%rdi 20: 48 89 fa mov %rdi,%rdx 23: 48 c1 ea 03 shr $0x3,%rdx * 27: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2b: 0f 85 d8 00 00 00 jne 0x109 31: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 38: fc ff df 3b: 4c rex.WR 3c: 8b .byte 0x8b --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection If the bug is already fixed, 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 change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
