general protection fault, probably for non-canonical address 0xdffffc000000003d: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef] CPU: 2 PID: 114 Comm: kswapd1 Not tainted 6.4.0-rc1-syzkaller-00109-gcc3c44c9fda2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 RIP: 0010:__lock_acquire+0xdce/0x5df0 kernel/locking/lockdep.c:4942 Code: 00 00 3b 05 94 6f 59 0f 0f 87 42 0a 00 00 41 be 01 00 00 00 e9 83 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 19 32 00 00 48 81 3b 20 f8 15 90 0f 84 06 f3 ff RSP: 0018:ffffc90000e7f028 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 00000000000001e8 RCX: 0000000000000000 RDX: 000000000000003d RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888017a00000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f7378000 CR3: 000000000c571000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire kernel/locking/lockdep.c:5691 [inline] lock_acquire+0x1b1/0x520 kernel/locking/lockdep.c:5656 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:350 [inline] detach_extent_buffer_page+0x7b0/0xfb0 fs/btrfs/extent_io.c:3461 btrfs_release_extent_buffer_pages+0x143/0x410 fs/btrfs/extent_io.c:3530 release_extent_buffer+0x242/0x2b0 fs/btrfs/extent_io.c:4028 try_release_extent_buffer+0x307/0x8d0 fs/btrfs/extent_io.c:5112 btree_release_folio+0xc2/0x100 fs/btrfs/disk-io.c:752 filemap_release_folio+0x13f/0x1b0 mm/filemap.c:4118 shrink_folio_list+0x2f51/0x3dc0 mm/vmscan.c:2076 evict_folios+0x794/0x1940 mm/vmscan.c:5157 try_to_shrink_lruvec+0x82c/0xb90 mm/vmscan.c:5333 shrink_one+0x462/0x710 mm/vmscan.c:5377 shrink_many mm/vmscan.c:5429 [inline] lru_gen_shrink_node mm/vmscan.c:5546 [inline] shrink_node+0x1fd5/0x3500 mm/vmscan.c:6487 kswapd_shrink_node mm/vmscan.c:7287 [inline] balance_pgdat+0xa02/0x1ac0 mm/vmscan.c:7477 kswapd+0x677/0xd60 mm/vmscan.c:7737 kthread+0x344/0x440 kernel/kthread.c:379 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:__lock_acquire+0xdce/0x5df0 kernel/locking/lockdep.c:4942 Code: 00 00 3b 05 94 6f 59 0f 0f 87 42 0a 00 00 41 be 01 00 00 00 e9 83 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 <80> 3c 02 00 0f 85 19 32 00 00 48 81 3b 20 f8 15 90 0f 84 06 f3 ff RSP: 0018:ffffc90000e7f028 EFLAGS: 00010002 RAX: dffffc0000000000 RBX: 00000000000001e8 RCX: 0000000000000000 RDX: 000000000000003d RSI: 0000000000000000 RDI: 00000000000001e8 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888017a00000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff88802c800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000f7378000 CR3: 000000000c571000 CR4: 0000000000350ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 3b 05 94 6f 59 0f cmp 0xf596f94(%rip),%eax # 0xf596f9c 8: 0f 87 42 0a 00 00 ja 0xa50 e: 41 be 01 00 00 00 mov $0x1,%r14d 14: e9 83 00 00 00 jmpq 0x9c 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 da mov %rbx,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 19 32 00 00 jne 0x324d 34: 48 81 3b 20 f8 15 90 cmpq $0xffffffff9015f820,(%rbx) 3b: 0f .byte 0xf 3c: 84 06 test %al,(%rsi) 3e: f3 repz 3f: ff .byte 0xff