Title | Replies (including bot) | Last reply |
---|---|---|
possible deadlock in get_user_pages_unlocked | 8 (9) | 2018/03/10 04:15 |
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Title | Replies (including bot) | Last reply |
---|---|---|
possible deadlock in get_user_pages_unlocked | 8 (9) | 2018/03/10 04:15 |
Kernel | Title | Repro | Cause bisect | Fix bisect | Count | Last | Reported | Patched | Status |
---|---|---|---|---|---|---|---|---|---|
upstream | possible deadlock in get_user_pages_unlocked (2) mm | C | done | 4 | 1955d | 1959d | 0/28 | closed as invalid on 2019/06/23 22:16 |
============================================ WARNING: possible recursive locking detected 4.15.0+ #291 Not tainted -------------------------------------------- syzkaller746568/4446 is trying to acquire lock: (&mm->mmap_sem){++++}, at: [<000000006212449e>] __get_user_pages_locked mm/gup.c:909 [inline] (&mm->mmap_sem){++++}, at: [<000000006212449e>] get_user_pages_unlocked+0x218/0x4f0 mm/gup.c:990 but task is already holding lock: (&mm->mmap_sem){++++}, at: [<000000009bfdb3c4>] get_user_pages_unlocked+0xff/0x4f0 mm/gup.c:989 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&mm->mmap_sem); lock(&mm->mmap_sem); *** DEADLOCK *** May be due to missing lock nesting notation 3 locks held by syzkaller746568/4446: #0: (&vcpu->mutex){+.+.}, at: [<00000000d22fa6cb>] vcpu_load+0x1c/0x70 arch/x86/kvm/../../../virt/kvm/kvm_main.c:158 #1: (&kvm->srcu){....}, at: [<000000007ac6ea14>] vcpu_enter_guest arch/x86/kvm/x86.c:7064 [inline] #1: (&kvm->srcu){....}, at: [<000000007ac6ea14>] vcpu_run arch/x86/kvm/x86.c:7143 [inline] #1: (&kvm->srcu){....}, at: [<000000007ac6ea14>] kvm_arch_vcpu_ioctl_run+0x1b11/0x5bf0 arch/x86/kvm/x86.c:7310 #2: (&mm->mmap_sem){++++}, at: [<000000009bfdb3c4>] get_user_pages_unlocked+0xff/0x4f0 mm/gup.c:989 stack backtrace: CPU: 0 PID: 4446 Comm: syzkaller746568 Not tainted 4.15.0+ #291 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 print_deadlock_bug kernel/locking/lockdep.c:1761 [inline] check_deadlock kernel/locking/lockdep.c:1805 [inline] validate_chain kernel/locking/lockdep.c:2401 [inline] __lock_acquire+0xe8f/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 down_read+0x96/0x150 kernel/locking/rwsem.c:24 __get_user_pages_locked mm/gup.c:909 [inline] get_user_pages_unlocked+0x218/0x4f0 mm/gup.c:990 hva_to_pfn_slow arch/x86/kvm/../../../virt/kvm/kvm_main.c:1388 [inline] hva_to_pfn arch/x86/kvm/../../../virt/kvm/kvm_main.c:1493 [inline] __gfn_to_pfn_memslot+0x386/0xf80 arch/x86/kvm/../../../virt/kvm/kvm_main.c:1549 try_async_pf+0x13b/0xc40 arch/x86/kvm/mmu.c:3802 tdp_page_fault+0x40a/0xa70 arch/x86/kvm/mmu.c:3898 kvm_mmu_page_fault+0x10d/0x2f0 arch/x86/kvm/mmu.c:4928 handle_ept_violation+0x198/0x550 arch/x86/kvm/vmx.c:6550 vmx_handle_exit+0x25d/0x1ce0 arch/x86/kvm/vmx.c:8893 vcpu_enter_guest arch/x86/kvm/x86.c:7081 [inline] vcpu_run arch/x86/kvm/x86.c:7143 [inline] kvm_arch_vcpu_ioctl_run+0x1c69/0x5bf0 arch/x86/kvm/x86.c:7310 kvm_vcpu_ioctl+0x64c/0x1010 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2564 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1520 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x29/0xa0 RIP: 0033:0x448fc9 RSP: 002b:00007ff4b260ada8 EFLAGS: 00000297 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff4b260b700 RCX: 0000000000448fc9 RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000008 RBP: 00007fffca7f9900 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000297 R12: 0000000000000000 R13: 00007fffca7f985f R14: 00007ff4b260b9c0 R15: 000000000000000d WARNING: CPU: 0 PID: 4446 at mm/gup.c:498 faultin_page mm/gup.c:498 [inline] WARNING: CPU: 0 PID: 4446 at mm/gup.c:498 __get_user_pages+0x10a7/0x15f0 mm/gup.c:699
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2018/02/02 00:37 | upstream | 7109a04eae81 | 67bd3383 | .config | console log | report | syz | C | ci-upstream-kasan-gce | |||
2018/02/25 00:22 | upstream | 9cb9c07d6b0c | 5c1e0207 | .config | console log | report | ci-upstream-kasan-gce | |||||
2018/02/08 16:28 | upstream | 581e400ff935 | 9fb5ec43 | .config | console log | report | ci-upstream-kasan-gce | |||||
2018/02/02 00:05 | upstream | 7109a04eae81 | 67bd3383 | .config | console log | report | ci-upstream-kasan-gce | |||||
2018/02/25 00:44 | upstream | 9cb9c07d6b0c | 5c1e0207 | .config | console log | report | ci-upstream-kasan-gce-386 |