Hello, syzbot found the following issue on: HEAD commit: 4357f03d6611 Merge tag 'pm-5.15-rc2' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173e2d27300000 kernel config: https://syzkaller.appspot.com/x/.config?x=ccfb8533b1cbe3b1 dashboard link: https://syzkaller.appspot.com/bug?extid=533f389d4026d86a2a95 compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1395c6f1300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11568cad300000 The issue was bisected to: commit 020250f31c4c75ac7687a673e29c00786582a5f4 Author: Dmitry Kadashev <dkadashev@xxxxxxxxx> Date: Thu Jul 8 06:34:43 2021 +0000 namei: make do_linkat() take struct filename bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=137e8a4b300000 final oops: https://syzkaller.appspot.com/x/report.txt?x=10fe8a4b300000 console output: https://syzkaller.appspot.com/x/log.txt?x=177e8a4b300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+533f389d4026d86a2a95@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: 020250f31c4c ("namei: make do_linkat() take struct filename") general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17] CPU: 1 PID: 148 Comm: kworker/u4:2 Not tainted 5.15.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline] RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:319 [inline] RIP: 0010:percpu_ref_put+0x93/0x1d0 include/linux/percpu-refcount.h:338 Code: 01 48 c7 c7 40 58 52 8a be b1 02 00 00 48 c7 c2 80 58 52 8a e8 fe 18 e9 ff 49 bd 00 00 00 00 00 fc ff df 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 9e 73 52 00 48 8b 2b 48 89 ee 48 RSP: 0018:ffffc90000dc0b30 EFLAGS: 00010206 RAX: 0000000000000182 RBX: 0000000000000c10 RCX: ffff888016781c80 RDX: 0000000080000100 RSI: 0000000000000004 RDI: ffff8880b9d32508 RBP: 000000000000003f R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff88806df0a000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f853d75b740 CR3: 00000000702e7000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> cgroup_bpf_put include/linux/cgroup.h:926 [inline] cgroup_sk_free+0x3c/0xa0 kernel/cgroup/cgroup.c:6613 sk_prot_free net/core/sock.c:1852 [inline] __sk_destruct+0x541/0x820 net/core/sock.c:1943 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers+0x71a/0x910 kernel/time/timer.c:1734 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1747 __do_softirq+0x392/0x7a3 kernel/softirq.c:558 __irq_exit_rcu+0xec/0x170 kernel/softirq.c:636 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1097 </IRQ> asm_sysvec_apic_timer_interrupt+0x12/0x20 RIP: 0010:lock_acquire+0x21f/0x4d0 kernel/locking/lockdep.c:5629 Code: 08 4c 89 f7 e8 c2 d1 69 00 f6 84 24 81 00 00 00 02 0f 85 13 02 00 00 41 f7 c4 00 02 00 00 74 01 fb 48 c7 44 24 40 0e 36 e0 45 <4b> c7 04 2f 00 00 00 00 43 c7 44 2f 09 00 00 00 00 43 c7 44 2f 11 RSP: 0018:ffffc9000170f8e0 EFLAGS: 00000206 RAX: 0000000000000001 RBX: 1ffff920002e1f2c RCX: ffff888016782670 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000170fa40 R08: dffffc0000000000 R09: fffffbfff1fa2fc1 R10: fffffbfff1fa2fc1 R11: 0000000000000000 R12: 0000000000000246 R13: 1ffff920002e1f24 R14: ffffc9000170f960 R15: dffffc0000000000 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267 rcu_read_lock include/linux/rcupdate.h:687 [inline] inet_twsk_purge+0x11b/0x890 net/ipv4/inet_timewait_sock.c:268 ops_exit_list net/core/net_namespace.c:171 [inline] cleanup_net+0x7ec/0xc50 net/core/net_namespace.c:591 process_one_work+0x853/0x1140 kernel/workqueue.c:2297 worker_thread+0xac1/0x1320 kernel/workqueue.c:2444 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 Modules linked in: ---[ end trace 6ae4e3b5aac552a5 ]--- RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline] RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:319 [inline] RIP: 0010:percpu_ref_put+0x93/0x1d0 include/linux/percpu-refcount.h:338 Code: 01 48 c7 c7 40 58 52 8a be b1 02 00 00 48 c7 c2 80 58 52 8a e8 fe 18 e9 ff 49 bd 00 00 00 00 00 fc ff df 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 9e 73 52 00 48 8b 2b 48 89 ee 48 RSP: 0018:ffffc90000dc0b30 EFLAGS: 00010206 RAX: 0000000000000182 RBX: 0000000000000c10 RCX: ffff888016781c80 RDX: 0000000080000100 RSI: 0000000000000004 RDI: ffff8880b9d32508 RBP: 000000000000003f R08: dffffc0000000000 R09: ffffed10173a64a2 R10: ffffed10173a64a2 R11: 0000000000000000 R12: ffff88806df0a000 R13: dffffc0000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f853d75b740 CR3: 000000000c68e000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 c7 c7 40 58 52 8a mov $0xffffffff8a525840,%rdi 7: be b1 02 00 00 mov $0x2b1,%esi c: 48 c7 c2 80 58 52 8a mov $0xffffffff8a525880,%rdx 13: e8 fe 18 e9 ff callq 0xffe91916 18: 49 bd 00 00 00 00 00 movabs $0xdffffc0000000000,%r13 1f: fc ff df 22: 48 89 d8 mov %rbx,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 48 89 df mov %rbx,%rdi 33: e8 9e 73 52 00 callq 0x5273d6 38: 48 8b 2b mov (%rbx),%rbp 3b: 48 89 ee mov %rbp,%rsi 3e: 48 rex.W --- 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 syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
