general protection fault, probably for non-canonical address 0xdffffc0000000002: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] CPU: 1 PID: 4159 Comm: syz-executor.0 Not tainted 6.1.0-rc2-syzkaller-00078-g98555239e4c3-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 RIP: 0010:dbgfs_rm_context mm/damon/dbgfs.c:900 [inline] RIP: 0010:dbgfs_rm_context_write+0x155/0x4c0 mm/damon/dbgfs.c:971 Code: a1 c1 a7 ff 45 85 e4 0f 85 ca 02 00 00 e8 c3 c4 a7 ff 48 8b 1d 5c 86 52 0f 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 03 00 00 48 8b 2b 48 85 ed 0f 84 8e 02 00 00 RSP: 0018:ffffc9000596fcb0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff81d4d7bd RDI: 0000000000000005 RBP: 0000000020000040 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000008c07e R12: 0000000000000000 R13: ffff88806d41a000 R14: ffffc9000596fec8 R15: ffffffffffffffea FS: 00007f469e46e700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f469d7a80c0 CR3: 000000007ebb7000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: full_proxy_write+0x118/0x180 fs/debugfs/file.c:236 vfs_write+0x2d7/0xdd0 fs/read_write.c:582 ksys_write+0x127/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f469d68b5a9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f469e46e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f469d7abf80 RCX: 00007f469d68b5a9 RDX: 0000000000000188 RSI: 0000000020000040 RDI: 0000000000000003 RBP: 00007f469d6e67b0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fffab8c608f R14: 00007f469e46e300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:dbgfs_rm_context mm/damon/dbgfs.c:900 [inline] RIP: 0010:dbgfs_rm_context_write+0x155/0x4c0 mm/damon/dbgfs.c:971 Code: a1 c1 a7 ff 45 85 e4 0f 85 ca 02 00 00 e8 c3 c4 a7 ff 48 8b 1d 5c 86 52 0f 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 1f 03 00 00 48 8b 2b 48 85 ed 0f 84 8e 02 00 00 RSP: 0018:ffffc9000596fcb0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000000 RDX: 0000000000000002 RSI: ffffffff81d4d7bd RDI: 0000000000000005 RBP: 0000000020000040 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 000000000008c07e R12: 0000000000000000 R13: ffff88806d41a000 R14: ffffc9000596fec8 R15: ffffffffffffffea FS: 00007f469e46e700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f469e44d718 CR3: 000000007ebb7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 4 bytes skipped: 0: 45 85 e4 test %r12d,%r12d 3: 0f 85 ca 02 00 00 jne 0x2d3 9: e8 c3 c4 a7 ff callq 0xffa7c4d1 e: 48 8b 1d 5c 86 52 0f mov 0xf52865c(%rip),%rbx # 0xf528671 15: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1c: fc ff df 1f: 48 89 da mov %rbx,%rdx 22: 48 c1 ea 03 shr $0x3,%rdx * 26: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2a: 0f 85 1f 03 00 00 jne 0x34f 30: 48 8b 2b mov (%rbx),%rbp 33: 48 85 ed test %rbp,%rbp 36: 0f 84 8e 02 00 00 je 0x2ca