Warning: Permanently added '10.128.0.84' (ECDSA) to the list of known hosts.
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syzkaller login: [   57.620881] 
[   57.622560] ======================================================
[   57.628856] WARNING: possible circular locking dependency detected
[   57.635152] 5.0.0-rc4+ #55 Not tainted
[   57.639064] ------------------------------------------------------
[   57.645387] syz-executor056/8093 is trying to acquire lock:
[   57.651086] 000000009f0c249a (&mm->mmap_sem){++++}, at: __do_page_fault+0x9c2/0xd60
[   57.658886] 
[   57.658886] but task is already holding lock:
[   57.664834] 00000000c04ead3e (&sb->s_type->i_mutex_key#12){+.+.}, at: generic_file_write_iter+0xe5/0x6a0
[   57.674442] 
[   57.674442] which lock already depends on the new lock.
[   57.674442] 
[   57.682759] 
[   57.682759] the existing dependency chain (in reverse order) is:
[   57.690363] 
[   57.690363] -> #2 (&sb->s_type->i_mutex_key#12){+.+.}:
[   57.697107]        down_write+0x8a/0x130
[   57.701153]        shmem_fallocate+0x168/0x1200
[   57.705819]        ashmem_shrink_scan+0x239/0x630
[   57.710664]        ashmem_ioctl+0x38a/0x12c0
[   57.715069]        do_vfs_ioctl+0x107b/0x17d0
[   57.719568]        ksys_ioctl+0xab/0xd0
[   57.723539]        __x64_sys_ioctl+0x73/0xb0
[   57.727932]        do_syscall_64+0x1a3/0x800
[   57.732324]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   57.738010] 
[   57.738010] -> #1 (ashmem_mutex){+.+.}:
[   57.743446]        __mutex_lock+0x12f/0x1670
[   57.747837]        mutex_lock_nested+0x16/0x20
[   57.752402]        ashmem_mmap+0x55/0x520
[   57.756533]        mmap_region+0xde5/0x1ca0
[   57.760836]        do_mmap+0xa09/0x1220
[   57.764793]        vm_mmap_pgoff+0x20b/0x2b0
[   57.769183]        ksys_mmap_pgoff+0x4f8/0x650
[   57.773751]        __x64_sys_mmap+0xe9/0x1b0
[   57.778160]        do_syscall_64+0x1a3/0x800
[   57.782553]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   57.788265] 
[   57.788265] -> #0 (&mm->mmap_sem){++++}:
[   57.793802]        lock_acquire+0x1db/0x570
[   57.798104]        down_read+0x8d/0x120
[   57.802074]        __do_page_fault+0x9c2/0xd60
[   57.806647]        do_page_fault+0xe6/0x7d8
[   57.810969]        page_fault+0x1e/0x30
[   57.814927]        iov_iter_fault_in_readable+0x377/0x450
[   57.820472]        generic_perform_write+0x202/0x6b0
[   57.825562]        __generic_file_write_iter+0x25e/0x630
[   57.831003]        generic_file_write_iter+0x34e/0x6a0
[   57.836262]        __vfs_write+0x764/0xb40
[   57.840475]        vfs_write+0x20c/0x580
[   57.844535]        ksys_write+0x105/0x260
[   57.848663]        __x64_sys_write+0x73/0xb0
[   57.853054]        do_syscall_64+0x1a3/0x800
[   57.857464]        entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   57.863150] 
[   57.863150] other info that might help us debug this:
[   57.863150] 
[   57.871266] Chain exists of:
[   57.871266]   &mm->mmap_sem --> ashmem_mutex --> &sb->s_type->i_mutex_key#12
[   57.871266] 
[   57.882784]  Possible unsafe locking scenario:
[   57.882784] 
[   57.888818]        CPU0                    CPU1
[   57.893464]        ----                    ----
[   57.898115]   lock(&sb->s_type->i_mutex_key#12);
[   57.902851]                                lock(ashmem_mutex);
[   57.908799]                                lock(&sb->s_type->i_mutex_key#12);
[   57.916051]   lock(&mm->mmap_sem);
[   57.919583] 
[   57.919583]  *** DEADLOCK ***
[   57.919583] 
[   57.925636] 2 locks held by syz-executor056/8093:
[   57.930461]  #0: 00000000ef40b124 (sb_writers#5){.+.+}, at: vfs_write+0x429/0x580
[   57.938101]  #1: 00000000c04ead3e (&sb->s_type->i_mutex_key#12){+.+.}, at: generic_file_write_iter+0xe5/0x6a0
[   57.948158] 
[   57.948158] stack backtrace:
[   57.952634] CPU: 1 PID: 8093 Comm: syz-executor056 Not tainted 5.0.0-rc4+ #55
[   57.959883] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.969214] Call Trace:
[   57.971793]  dump_stack+0x1db/0x2d0
[   57.975405]  ? dump_stack_print_info.cold+0x20/0x20
[   57.980426]  ? print_stack_trace+0x77/0xb0
[   57.984669]  ? vprintk_func+0x86/0x189
[   57.988542]  print_circular_bug.isra.0.cold+0x1cc/0x28f
[   57.993885]  __lock_acquire+0x3014/0x4a30
[   57.998021]  ? mark_held_locks+0x100/0x100
[   58.002244]  ? shmem_getpage_gfp+0x197e/0x4b70
[   58.006826]  ? trace_hardirqs_off_caller+0x300/0x300
[   58.011912]  ? do_raw_spin_trylock+0x270/0x270
[   58.016481]  ? shmem_getpage_gfp+0x26fb/0x4b70
[   58.021051]  ? __lock_is_held+0xb6/0x140
[   58.025094]  lock_acquire+0x1db/0x570
[   58.028879]  ? __do_page_fault+0x9c2/0xd60
[   58.033098]  ? ___might_sleep+0x1e7/0x310
[   58.037247]  ? lock_release+0xc40/0xc40
[   58.041227]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   58.046240]  ? cmp_ex_search+0x8c/0xb0
[   58.050143]  down_read+0x8d/0x120
[   58.053578]  ? __do_page_fault+0x9c2/0xd60
[   58.057810]  ? __down_interruptible+0x740/0x740
[   58.062462]  ? do_writepages+0x1a0/0x1a0
[   58.066513]  ? set_page_dirty+0x5dd/0xfc0
[   58.070646]  __do_page_fault+0x9c2/0xd60
[   58.074694]  do_page_fault+0xe6/0x7d8
[   58.078477]  ? unlock_page+0x2b1/0x4a0
[   58.082349]  ? vmalloc_sync_all+0x30/0x30
[   58.086485]  ? balance_dirty_pages_ratelimited+0x1b0/0x2370
[   58.092201]  ? retint_kernel+0x2d/0x2d
[   58.096094]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.100919]  page_fault+0x1e/0x30
[   58.104385] RIP: 0010:iov_iter_fault_in_readable+0x377/0x450
[   58.110163] Code: 89 f6 41 88 57 e0 e8 e8 ad f3 fd 45 85 f6 74 c1 e9 70 fe ff ff e8 59 ac f3 fd 0f 1f 00 0f ae e8 44 89 f0 48 8b 8d 68 ff ff ff <8a> 11 89 c3 0f 1f 00 41 88 57 d0 31 ff 89 de e8 b5 ad f3 fd 85 db
[   58.129062] RSP: 0018:ffff88808aaaf8a8 EFLAGS: 00010293
[   58.134406] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000020e30c3f
[   58.141658] RDX: 0000000000000000 RSI: ffffffff838e5807 RDI: 0000000000000007
[   58.148905] RBP: ffff88808aaaf948 R08: ffff88808fa4e600 R09: fffff94000423baf
[   58.156178] R10: fffff94000423bae R11: ffffea000211dd77 R12: 0000000000001000
[   58.163429] R13: 0000000000001000 R14: 0000000000000000 R15: ffff88808aaaf920
[   58.170699]  ? iov_iter_fault_in_readable+0x367/0x450
[   58.175905]  ? iov_iter_fault_in_readable+0x367/0x450
[   58.181079]  ? copy_page_from_iter+0x900/0x900
[   58.185646]  ? shmem_write_begin+0x105/0x1e0
[   58.190037]  ? shmem_write_begin+0x10f/0x1e0
[   58.194428]  generic_perform_write+0x202/0x6b0
[   58.198997]  ? add_page_wait_queue+0x480/0x480
[   58.203562]  ? current_time+0x1b0/0x1b0
[   58.207528]  ? __sanitizer_cov_trace_cmp8+0x18/0x20
[   58.212532]  ? generic_write_check_limits+0x291/0x380
[   58.217727]  __generic_file_write_iter+0x25e/0x630
[   58.222638]  ? __fget+0x499/0x710
[   58.226076]  generic_file_write_iter+0x34e/0x6a0
[   58.230816]  ? __generic_file_write_iter+0x630/0x630
[   58.235902]  ? kfree+0xcf/0x230
[   58.239162]  ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   58.244506]  ? __sanitizer_cov_trace_const_cmp8+0x18/0x20
[   58.250024]  ? iov_iter_init+0xea/0x220
[   58.254011]  __vfs_write+0x764/0xb40
[   58.257709]  ? kernel_read+0x120/0x120
[   58.261590]  ? rcu_read_lock_sched_held+0x110/0x130
[   58.266599]  ? rcu_sync_lockdep_assert+0x73/0xb0
[   58.271345]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   58.276881]  ? __sb_start_write+0x1ac/0x360
[   58.281188]  vfs_write+0x20c/0x580
[   58.284728]  ksys_write+0x105/0x260
[   58.288380]  ? __ia32_sys_read+0xb0/0xb0
[   58.292453]  ? do_futex+0x2910/0x2910
[   58.296254]  ? trace_hardirqs_off_caller+0x300/0x300
[   58.301352]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   58.306089]  __x64_sys_write+0x73/0xb0
[   58.309962]  do_syscall_64+0x1a3/0x800
[   58.313835]  ? syscall_return_slowpath+0x5f0/0x5f0
[   58.318756]  ? prepare_exit_to_usermode+0x232/0x3b0
[   58.323760]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   58.328600]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[   58.333797] RIP: 0033:0x4463d9
[   58.336973] Code: e8 2c b3 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 2b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[   58.355853] RSP: 002b:00007fcb2406eda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   58.363539] RAX: ffffffffffffffda RBX: 00000000006dbc28 RCX: 00000000004463d9
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[   58.370790] RDX: 00000000fffffe43 RSI: 0000000020000c40 RDI: 0000000000000004
[   58.378049] RBP: 00000000006dbc20 R08: 0000000000000000 R09: 0000000000000000
[   58.385323] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc2c
[   58.392582] R13: 0000000000000000 R14: 0080000080000000 R15: 20c49ba5e353f7cf
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