syzbot has found a reproducer for the following issue on: HEAD commit: 9b2ffa6148b1 Merge tag 'mtd/fixes-for-6.13-rc5' of git://g.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=10a00018580000 kernel config: https://syzkaller.appspot.com/x/.config?x=d269ef41b9262400 dashboard link: https://syzkaller.appspot.com/bug?extid=14641d8d78cc029add8a compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14ad74c4580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/73bb7d109a64/disk-9b2ffa61.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/001f7910aa4e/vmlinux-9b2ffa61.xz kernel image: https://storage.googleapis.com/syzbot-assets/11e525a24c33/bzImage-9b2ffa61.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+14641d8d78cc029add8a@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: unable to handle page fault for address: fffffbfff3f8171b #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 23ffe4067 P4D 23ffe4067 PUD 23ffe3067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.13.0-rc4-syzkaller-00012-g9b2ffa6148b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189 Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 RSP: 0018:ffffffff8e607640 EFLAGS: 00010086 RAX: 000000000172ce01 RBX: 1ffffffff3f8171b RCX: ffffffff817ac1c4 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9fc0b8d8 RBP: ffffffffffffffff R08: ffffffff9fc0b8df R09: 1ffffffff3f8171b R10: dffffc0000000000 R11: fffffbfff3f8171b R12: ffffffff8e697084 R13: ffffffff8e6965c0 R14: dffffc0000000001 R15: fffffbfff3f8171c FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff3f8171b CR3: 000000005d4e4000 CR4: 0000000000350ef0 Call Trace: <TASK> instrument_atomic_read include/linux/instrumented.h:68 [inline] _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline] __lock_acquire+0xc94/0x2100 kernel/locking/lockdep.c:5196 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5849 _raw_spin_lock_nested+0x31/0x40 kernel/locking/spinlock.c:378 raw_spin_rq_lock_nested+0xb0/0x140 kernel/sched/core.c:606 raw_spin_rq_lock kernel/sched/sched.h:1523 [inline] raw_spin_rq_lock_irq kernel/sched/sched.h:1529 [inline] sched_core_balance+0xd87/0xf50 kernel/sched/core.c:6411 do_balance_callbacks kernel/sched/core.c:5021 [inline] __balance_callbacks+0x18a/0x280 kernel/sched/core.c:5075 finish_lock_switch kernel/sched/core.c:5122 [inline] finish_task_switch+0x1d3/0x870 kernel/sched/core.c:5241 context_switch kernel/sched/core.c:5372 [inline] __schedule+0x1858/0x4c30 kernel/sched/core.c:6756 schedule_idle+0x56/0x90 kernel/sched/core.c:6874 do_idle+0x567/0x5c0 kernel/sched/idle.c:353 cpu_startup_entry+0x42/0x60 kernel/sched/idle.c:423 rest_init+0x2dc/0x300 init/main.c:747 start_kernel+0x47f/0x500 init/main.c:1102 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0x9f/0xa0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x147 </TASK> Modules linked in: CR2: fffffbfff3f8171b ---[ end trace 0000000000000000 ]--- RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:87 [inline] RIP: 0010:memory_is_nonzero mm/kasan/generic.c:104 [inline] RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:129 [inline] RIP: 0010:memory_is_poisoned mm/kasan/generic.c:161 [inline] RIP: 0010:check_region_inline mm/kasan/generic.c:180 [inline] RIP: 0010:kasan_check_range+0x82/0x290 mm/kasan/generic.c:189 Code: 01 00 00 00 00 fc ff df 4f 8d 3c 31 4c 89 fd 4c 29 dd 48 83 fd 10 7f 29 48 85 ed 0f 84 3e 01 00 00 4c 89 cd 48 f7 d5 48 01 dd <41> 80 3b 00 0f 85 c9 01 00 00 49 ff c3 48 ff c5 75 ee e9 1e 01 00 RSP: 0018:ffffffff8e607640 EFLAGS: 00010086 RAX: 000000000172ce01 RBX: 1ffffffff3f8171b RCX: ffffffff817ac1c4 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff9fc0b8d8 RBP: ffffffffffffffff R08: ffffffff9fc0b8df R09: 1ffffffff3f8171b R10: dffffc0000000000 R11: fffffbfff3f8171b R12: ffffffff8e697084 R13: ffffffff8e6965c0 R14: dffffc0000000001 R15: fffffbfff3f8171c FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffbfff3f8171b CR3: 000000005d4e4000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 7 bytes skipped: 0: df 4f 8d fisttps -0x73(%rdi) 3: 3c 31 cmp $0x31,%al 5: 4c 89 fd mov %r15,%rbp 8: 4c 29 dd sub %r11,%rbp b: 48 83 fd 10 cmp $0x10,%rbp f: 7f 29 jg 0x3a 11: 48 85 ed test %rbp,%rbp 14: 0f 84 3e 01 00 00 je 0x158 1a: 4c 89 cd mov %r9,%rbp 1d: 48 f7 d5 not %rbp 20: 48 01 dd add %rbx,%rbp * 23: 41 80 3b 00 cmpb $0x0,(%r11) <-- trapping instruction 27: 0f 85 c9 01 00 00 jne 0x1f6 2d: 49 ff c3 inc %r11 30: 48 ff c5 inc %rbp 33: 75 ee jne 0x23 35: e9 .byte 0xe9 36: 1e (bad) 37: 01 00 add %eax,(%rax) --- 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.
