Warning: Permanently added '10.128.0.27' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 53.214113][ T8068] IPVS: ftp: loaded support on port[0] = 21 [ 53.290477][ T8071] [ 53.292836][ T8071] ====================================================== [ 53.299945][ T8071] WARNING: possible circular locking dependency detected [ 53.307903][ T8071] 5.4.0-rc2+ #0 Not tainted [ 53.312476][ T8071] ------------------------------------------------------ [ 53.320686][ T8071] syz-executor968/8071 is trying to acquire lock: [ 53.327128][ T8071] ffff888093877598 (&mm->mmap_sem#2){++++}, at: __might_fault+0xd2/0x160 [ 53.335527][ T8071] [ 53.335527][ T8071] but task is already holding lock: [ 53.342888][ T8071] ffff88809cac3d00 (&rp->fetch_lock){+.+.}, at: mon_bin_read+0x5c/0x7b0 [ 53.351468][ T8071] [ 53.351468][ T8071] which lock already depends on the new lock. [ 53.351468][ T8071] [ 53.361854][ T8071] [ 53.361854][ T8071] the existing dependency chain (in reverse order) is: [ 53.370852][ T8071] [ 53.370852][ T8071] -> #1 (&rp->fetch_lock){+.+.}: [ 53.377945][ T8071] lock_acquire+0x158/0x250 [ 53.382953][ T8071] __mutex_lock_common+0x14c/0x2e20 [ 53.388670][ T8071] mutex_lock_nested+0x1b/0x30 [ 53.393927][ T8071] mon_bin_vma_fault+0x6d/0x260 [ 53.399280][ T8071] __do_fault+0x144/0x3d0 [ 53.404116][ T8071] handle_mm_fault+0x42f1/0x5ff0 [ 53.409556][ T8071] __get_user_pages+0x1002/0x1610 [ 53.415230][ T8071] populate_vma_page_range+0x1fd/0x250 [ 53.421190][ T8071] __mm_populate+0x278/0x3d0 [ 53.426298][ T8071] vm_mmap_pgoff+0x1a0/0x1d0 [ 53.431399][ T8071] ksys_mmap_pgoff+0x46b/0x560 [ 53.436669][ T8071] __x64_sys_mmap+0x103/0x120 [ 53.441837][ T8071] do_syscall_64+0xf7/0x1c0 [ 53.446853][ T8071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.453324][ T8071] [ 53.453324][ T8071] -> #0 (&mm->mmap_sem#2){++++}: [ 53.460415][ T8071] validate_chain+0x161e/0x7bc0 [ 53.465759][ T8071] __lock_acquire+0xc75/0x1be0 [ 53.471012][ T8071] lock_acquire+0x158/0x250 [ 53.476007][ T8071] __might_fault+0xf5/0x160 [ 53.481068][ T8071] _copy_to_user+0x2c/0x150 [ 53.486104][ T8071] mon_bin_read+0x1ac/0x7b0 [ 53.491196][ T8071] __vfs_read+0xb8/0x730 [ 53.495932][ T8071] vfs_read+0x1dd/0x420 [ 53.500579][ T8071] ksys_read+0x117/0x220 [ 53.505313][ T8071] __x64_sys_read+0x7b/0x90 [ 53.510322][ T8071] do_syscall_64+0xf7/0x1c0 [ 53.515317][ T8071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.521786][ T8071] [ 53.521786][ T8071] other info that might help us debug this: [ 53.521786][ T8071] [ 53.531996][ T8071] Possible unsafe locking scenario: [ 53.531996][ T8071] [ 53.539420][ T8071] CPU0 CPU1 [ 53.544757][ T8071] ---- ---- [ 53.551309][ T8071] lock(&rp->fetch_lock); [ 53.555696][ T8071] lock(&mm->mmap_sem#2); [ 53.562600][ T8071] lock(&rp->fetch_lock); [ 53.569505][ T8071] lock(&mm->mmap_sem#2); [ 53.573889][ T8071] [ 53.573889][ T8071] *** DEADLOCK *** [ 53.573889][ T8071] [ 53.582187][ T8071] 1 lock held by syz-executor968/8071: [ 53.587615][ T8071] #0: ffff88809cac3d00 (&rp->fetch_lock){+.+.}, at: mon_bin_read+0x5c/0x7b0 [ 53.596351][ T8071] [ 53.596351][ T8071] stack backtrace: [ 53.602226][ T8071] CPU: 0 PID: 8071 Comm: syz-executor968 Not tainted 5.4.0-rc2+ #0 [ 53.610099][ T8071] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.620146][ T8071] Call Trace: [ 53.623410][ T8071] dump_stack+0x1d8/0x2f8 [ 53.627712][ T8071] print_circular_bug+0xc2d/0xe60 [ 53.632713][ T8071] ? stack_trace_save+0xb6/0x150 [ 53.637619][ T8071] ? save_trace+0x3f/0xa20 [ 53.642006][ T8071] check_noncircular+0x206/0x3a0 [ 53.646923][ T8071] validate_chain+0x161e/0x7bc0 [ 53.651757][ T8071] ? __kasan_check_read+0x11/0x20 [ 53.656750][ T8071] ? mark_lock+0x107/0x1650 [ 53.661222][ T8071] ? __lock_acquire+0xc75/0x1be0 [ 53.666146][ T8071] __lock_acquire+0xc75/0x1be0 [ 53.670900][ T8071] ? trace_lock_acquire+0x159/0x1d0 [ 53.676328][ T8071] lock_acquire+0x158/0x250 [ 53.680800][ T8071] ? __might_fault+0xd2/0x160 [ 53.685445][ T8071] __might_fault+0xf5/0x160 [ 53.689928][ T8071] ? __might_fault+0xd2/0x160 [ 53.694574][ T8071] _copy_to_user+0x2c/0x150 [ 53.699048][ T8071] mon_bin_read+0x1ac/0x7b0 [ 53.703529][ T8071] ? mon_bin_exit+0x40/0x40 [ 53.708014][ T8071] __vfs_read+0xb8/0x730 [ 53.712228][ T8071] ? security_file_permission+0x23c/0x350 [ 53.717916][ T8071] ? rw_verify_area+0x1c2/0x360 [ 53.722748][ T8071] vfs_read+0x1dd/0x420 [ 53.726874][ T8071] ksys_read+0x117/0x220 [ 53.731088][ T8071] __x64_sys_read+0x7b/0x90 [ 53.735561][ T8071] do_syscall_64+0xf7/0x1c0 [ 53.740040][ T8071] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 53.745901][ T8071] RIP: 0033:0x44a7a9 [ 53.749778][ T8071] Code: e8 ec b6 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 0f 83 cb cc fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 53.769507][ T8071] RSP: 002b:00007f4b3a27bce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 [ 53.777905][ T8071] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 000000000044a7a9 executing program executing program [ 53.785853][ T8071] RDX: 00000000000000cb RSI: 0000000020000100 RDI: 0000000000000003 [ 53.793798][ T8071] RBP: 00000000006dbc30 R08: 00007f4b3a27c700 R09: 0000000000000000 [ 53.801744][ T8071] R10: 00007f4b3a27c700 R11: 0000000000000246 R12: 00000000006dbc3c [ 53.809691][ T8071] R13: 00007ffc07c4157f R14: 00007f4b3a27c9c0 R15: 0000000000000001 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program