Hello, syzbot found the following issue on: HEAD commit: 5d4809e25903 Add linux-next specific files for 20250620 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=150ef30c580000 kernel config: https://syzkaller.appspot.com/x/.config?x=58afc4b78b52b7e3 dashboard link: https://syzkaller.appspot.com/bug?extid=25317a459958aec47bfa compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10a5330c580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c9f6bc580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/16492bf6b788/disk-5d4809e2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/7be284ded1de/vmlinux-5d4809e2.xz kernel image: https://storage.googleapis.com/syzbot-assets/467d717f0d9c/bzImage-5d4809e2.xz The issue was bisected to: commit fb0b3e2b2d7f213cb4fde623706f9ed6d748a373 Author: Christian Brauner <brauner@xxxxxxxxxx> Date: Wed Jun 18 20:53:46 2025 +0000 pidfs: support xattrs on pidfds bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=15a1b370580000 final oops: https://syzkaller.appspot.com/x/report.txt?x=17a1b370580000 console output: https://syzkaller.appspot.com/x/log.txt?x=13a1b370580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+25317a459958aec47bfa@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: fb0b3e2b2d7f ("pidfs: support xattrs on pidfds") Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 RIP: 0010:pidfs_free_pid+0xaf/0x140 fs/pidfs.c:162 Code: f0 ff ff 73 e4 43 80 3c 3c 00 74 08 4c 89 f7 e8 67 19 de ff 49 83 3e 00 0f 85 84 00 00 00 e8 78 ee 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 42 19 de ff 4c 8b 33 4d 85 f6 74 RSP: 0018:ffffc90000a08b90 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801ceada00 RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880745f4370 RBP: 0000000000000001 R08: ffff8880745f4303 R09: 1ffff1100e8be860 R10: dffffc0000000000 R11: ffffed100e8be861 R12: 1ffff1100e8be86d R13: ffffffff81a8bfb4 R14: ffff8880745f4368 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc2d1bf28 CR3: 00000000745f2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> put_pid+0x9c/0x130 kernel/pid.c:103 rcu_do_batch kernel/rcu/tree.c:2582 [inline] rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2838 handle_softirqs+0x286/0x870 kernel/softirq.c:579 __do_softirq kernel/softirq.c:613 [inline] invoke_softirq kernel/softirq.c:453 [inline] __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: 43 dd 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 d5 1a 00 f3 0f 1e fa fb f4 <e9> 18 dd 02 00 cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197de0 EFLAGS: 000002c6 RAX: 5ef6bd65ac57ee00 RBX: ffffffff81975fd8 RCX: 5ef6bd65ac57ee00 RDX: 0000000000000001 RSI: ffffffff8d991d22 RDI: ffffffff8be320a0 RBP: ffffc90000197f20 R08: ffff8880b8732f1b R09: 1ffff110170e65e3 R10: dffffc0000000000 R11: ffffed10170e65e4 R12: ffffffff8fa193f0 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff110039d5b40 arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:749 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x147 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:pidfs_free_pid+0xaf/0x140 fs/pidfs.c:162 Code: f0 ff ff 73 e4 43 80 3c 3c 00 74 08 4c 89 f7 e8 67 19 de ff 49 83 3e 00 0f 85 84 00 00 00 e8 78 ee 79 ff 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 42 19 de ff 4c 8b 33 4d 85 f6 74 RSP: 0018:ffffc90000a08b90 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88801ceada00 RDX: 0000000000000100 RSI: 0000000000000001 RDI: ffff8880745f4370 RBP: 0000000000000001 R08: ffff8880745f4303 R09: 1ffff1100e8be860 R10: dffffc0000000000 R11: ffffed100e8be861 R12: 1ffff1100e8be86d R13: ffffffff81a8bfb4 R14: ffff8880745f4368 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff888125d26000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcc2d1bf28 CR3: 00000000745f2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: f0 ff lock (bad) 2: ff 73 e4 push -0x1c(%rbx) 5: 43 80 3c 3c 00 cmpb $0x0,(%r12,%r15,1) a: 74 08 je 0x14 c: 4c 89 f7 mov %r14,%rdi f: e8 67 19 de ff call 0xffde197b 14: 49 83 3e 00 cmpq $0x0,(%r14) 18: 0f 85 84 00 00 00 jne 0xa2 1e: e8 78 ee 79 ff call 0xff79ee9b 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 42 19 de ff call 0xffde197b 39: 4c 8b 33 mov (%rbx),%r14 3c: 4d 85 f6 test %r14,%r14 3f: 74 .byte 0x74 --- 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 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
