Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5332 Comm: syz.4.5 Not tainted 6.11.0-rc4-next-20240823-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline] RIP: 0010:__rb_erase_color+0x2d7/0xa30 lib/rbtree.c:413 Code: 73 02 00 00 49 8d 5c 24 10 48 89 dd 48 c1 ed 03 42 80 7c 35 00 00 74 08 48 89 df e8 13 d8 44 f6 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 fa d7 44 f6 41 f6 45 00 01 48 89 RSP: 0018:ffffc900040a6760 EFLAGS: 00010046 RAX: 000000000016e360 RBX: ffff888029eadaa0 RCX: dffffc0000000000 RDX: ffffffff81680dc0 RSI: ffff8880b903eb48 RDI: ffff888029eada90 RBP: 1ffff110053d5b54 R08: ffffffff901c1baf R09: 1ffffffff2038375 R10: dffffc0000000000 R11: fffffbfff2038376 R12: ffff888029eada90 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3121da CR3: 0000000078e72000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rb_erase_augmented include/linux/rbtree_augmented.h:331 [inline] rb_erase_augmented_cached include/linux/rbtree_augmented.h:340 [inline] __dequeue_entity+0x953/0xd30 kernel/sched/fair.c:863 set_next_entity+0xfe/0x4c0 kernel/sched/fair.c:5559 set_next_task_fair+0x1dd/0x540 kernel/sched/fair.c:13151 set_next_task kernel/sched/sched.h:2434 [inline] pick_next_task kernel/sched/core.c:6085 [inline] __schedule+0x250c/0x4b30 kernel/sched/core.c:6632 preempt_schedule_common+0x84/0xd0 kernel/sched/core.c:6856 preempt_schedule+0xe1/0xf0 kernel/sched/core.c:6880 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 unwind_next_frame+0x18f8/0x22d0 arch/x86/kernel/unwind_orc.c:672 __unwind_start+0x59a/0x740 arch/x86/kernel/unwind_orc.c:760 unwind_start arch/x86/include/asm/unwind.h:64 [inline] arch_stack_walk+0xe5/0x150 arch/x86/kernel/stacktrace.c:24 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 save_stack+0xfb/0x1f0 mm/page_owner.c:156 __reset_page_owner+0x76/0x430 mm/page_owner.c:297 reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1098 [inline] free_unref_folios+0xe8a/0x1850 mm/page_alloc.c:2699 folios_put_refs+0x76c/0x860 mm/swap.c:1007 folio_batch_release include/linux/pagevec.h:101 [inline] shmem_undo_range+0x64c/0x1cf0 mm/shmem.c:1035 shmem_truncate_range mm/shmem.c:1147 [inline] shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1275 evict+0x58b/0x9e0 fs/inode.c:780 __dentry_kill+0x20d/0x630 fs/dcache.c:610 dput+0x19f/0x2b0 fs/dcache.c:852 __fput+0x5de/0x890 fs/file_table.c:432 task_work_run+0x24f/0x310 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xa2f/0x28e0 kernel/exit.c:939 do_group_exit+0x207/0x2c0 kernel/exit.c:1088 get_signal+0x176f/0x1810 kernel/signal.c:2936 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0xc9/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2854379e79 Code: Unable to access opcode bytes at 0x7f2854379e4f. RSP: 002b:00007f2855188038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: 0000000000010106 RBX: 00007f2854516058 RCX: 00007f2854379e79 RDX: 0000000000010106 RSI: 00000000200000c0 RDI: 0000000000000006 RBP: 00007f28543e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f2854516058 R15: 00007ffe08434f58 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:____rb_erase_color lib/rbtree.c:354 [inline] RIP: 0010:__rb_erase_color+0x2d7/0xa30 lib/rbtree.c:413 Code: 73 02 00 00 49 8d 5c 24 10 48 89 dd 48 c1 ed 03 42 80 7c 35 00 00 74 08 48 89 df e8 13 d8 44 f6 4c 8b 2b 4d 89 ef 49 c1 ef 03 <43> 80 3c 37 00 74 08 4c 89 ef e8 fa d7 44 f6 41 f6 45 00 01 48 89 RSP: 0018:ffffc900040a6760 EFLAGS: 00010046 RAX: 000000000016e360 RBX: ffff888029eadaa0 RCX: dffffc0000000000 RDX: ffffffff81680dc0 RSI: ffff8880b903eb48 RDI: ffff888029eada90 RBP: 1ffff110053d5b54 R08: ffffffff901c1baf R09: 1ffffffff2038375 R10: dffffc0000000000 R11: fffffbfff2038376 R12: ffff888029eada90 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3121da CR3: 0000000078e72000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 73 02 jae 0x4 2: 00 00 add %al,(%rax) 4: 49 8d 5c 24 10 lea 0x10(%r12),%rbx 9: 48 89 dd mov %rbx,%rbp c: 48 c1 ed 03 shr $0x3,%rbp 10: 42 80 7c 35 00 00 cmpb $0x0,0x0(%rbp,%r14,1) 16: 74 08 je 0x20 18: 48 89 df mov %rbx,%rdi 1b: e8 13 d8 44 f6 call 0xf644d833 20: 4c 8b 2b mov (%rbx),%r13 23: 4d 89 ef mov %r13,%r15 26: 49 c1 ef 03 shr $0x3,%r15 * 2a: 43 80 3c 37 00 cmpb $0x0,(%r15,%r14,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 fa d7 44 f6 call 0xf644d833 39: 41 f6 45 00 01 testb $0x1,0x0(%r13) 3e: 48 rex.W 3f: 89 .byte 0x89