loop7: detected capacity change from 0 to 256 general protection fault, probably for non-canonical address 0xdffffc000000002b: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000158-0x000000000000015f] CPU: 1 PID: 14130 Comm: syz.7.1937 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 RIP: 0010:__lock_acquire+0xf8/0x7c40 kernel/locking/lockdep.c:4933 Code: 42 0f b6 04 00 84 c0 0f 85 e9 64 00 00 83 3d 52 40 bd 0c 00 0f 84 80 27 00 00 83 3d 41 b9 3b 0b 00 74 2a 4c 89 e8 48 c1 e8 03 <42> 80 3c 00 00 74 12 4c 89 ef e8 39 61 6f 00 49 b8 00 00 00 00 00 RSP: 0018:ffffc9000485f820 EFLAGS: 00010006 RAX: 000000000000002b RBX: 0000000000000000 RCX: 1ffff9200090bf24 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000158 RBP: ffffc9000485fa50 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1c4215e R12: 0000000000000001 R13: 0000000000000158 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fee932d96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004280 CR3: 00000000493bb000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1bb/0x4a0 kernel/locking/lockdep.c:5676 down_read_killable+0x4c/0x340 kernel/locking/rwsem.c:1543 mmap_read_lock_killable include/linux/mmap_lock.h:126 [inline] proc_map_files_readdir+0x3c1/0x970 fs/proc/base.c:2413 iterate_dir+0x213/0x550 fs/readdir.c:-1 __do_sys_getdents64 fs/readdir.c:369 [inline] __se_sys_getdents64+0xf2/0x270 fs/readdir.c:354 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fee9239de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fee932d9028 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9 RAX: ffffffffffffffda RBX: 00007fee92625fa0 RCX: 00007fee9239de99 RDX: 000000000000005e RSI: 0000200000000280 RDI: 0000000000000005 RBP: 00007fee92433eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fee92626038 R14: 00007fee92625fa0 R15: 00007ffef9831e18 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xf8/0x7c40 kernel/locking/lockdep.c:4933 Code: 42 0f b6 04 00 84 c0 0f 85 e9 64 00 00 83 3d 52 40 bd 0c 00 0f 84 80 27 00 00 83 3d 41 b9 3b 0b 00 74 2a 4c 89 e8 48 c1 e8 03 <42> 80 3c 00 00 74 12 4c 89 ef e8 39 61 6f 00 49 b8 00 00 00 00 00 RSP: 0018:ffffc9000485f820 EFLAGS: 00010006 RAX: 000000000000002b RBX: 0000000000000000 RCX: 1ffff9200090bf24 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000158 RBP: ffffc9000485fa50 R08: dffffc0000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1c4215e R12: 0000000000000001 R13: 0000000000000158 R14: 0000000000000000 R15: 0000000000000001 FS: 00007fee932d96c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000004280 CR3: 00000000493bb000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 42 0f b6 04 00 movzbl (%rax,%r8,1),%eax 5: 84 c0 test %al,%al 7: 0f 85 e9 64 00 00 jne 0x64f6 d: 83 3d 52 40 bd 0c 00 cmpl $0x0,0xcbd4052(%rip) # 0xcbd4066 14: 0f 84 80 27 00 00 je 0x279a 1a: 83 3d 41 b9 3b 0b 00 cmpl $0x0,0xb3bb941(%rip) # 0xb3bb962 21: 74 2a je 0x4d 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 00 00 cmpb $0x0,(%rax,%r8,1) <-- trapping instruction 2f: 74 12 je 0x43 31: 4c 89 ef mov %r13,%rdi 34: e8 39 61 6f 00 call 0x6f6172 39: 49 rex.WB 3a: b8 00 00 00 00 mov $0x0,%eax