====================================================== WARNING: possible circular locking dependency detected 4.16.0-rc4+ #348 Not tainted ------------------------------------------------------ syz-executor2/10296 is trying to acquire lock: (&sb->s_type->i_mutex_key#11){++++}, at: [<00000000a120db71>] inode_lock include/linux/fs.h:713 [inline] (&sb->s_type->i_mutex_key#11){++++}, at: [<00000000a120db71>] shmem_file_llseek+0xef/0x240 mm/shmem.c:2579 but task is already holding lock: (ashmem_mutex){+.+.}, at: [<000000003e60ff8a>] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:326 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (ashmem_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0x16f/0x1a80 kernel/locking/mutex.c:893 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908 ashmem_mmap+0x53/0x410 drivers/staging/android/ashmem.c:362 call_mmap include/linux/fs.h:1786 [inline] mmap_region+0xa99/0x15a0 mm/mmap.c:1705 do_mmap+0x6c0/0xe00 mm/mmap.c:1483 do_mmap_pgoff include/linux/mm.h:2223 [inline] vm_mmap_pgoff+0x1de/0x280 mm/util.c:355 SYSC_mmap_pgoff mm/mmap.c:1533 [inline] SyS_mmap_pgoff+0x462/0x5f0 mm/mmap.c:1491 SYSC_mmap arch/x86/kernel/sys_x86_64.c:100 [inline] SyS_mmap+0x16/0x20 arch/x86/kernel/sys_x86_64.c:91 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #1 (&mm->mmap_sem){++++}: __might_fault+0x13a/0x1d0 mm/memory.c:4571 _copy_to_user+0x2c/0xc0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] filldir+0x1a7/0x320 fs/readdir.c:196 dir_emit_dot include/linux/fs.h:3370 [inline] dir_emit_dots include/linux/fs.h:3381 [inline] dcache_readdir+0x12d/0x5e0 fs/libfs.c:192 iterate_dir+0x1ca/0x530 fs/readdir.c:51 SYSC_getdents fs/readdir.c:231 [inline] SyS_getdents+0x225/0x450 fs/readdir.c:212 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 -> #0 (&sb->s_type->i_mutex_key#11){++++}: lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] shmem_file_llseek+0xef/0x240 mm/shmem.c:2579 vfs_llseek+0xa2/0xd0 fs/read_write.c:300 ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:338 vfs_llseek fs/read_write.c:300 [inline] SYSC_lseek fs/read_write.c:313 [inline] SyS_lseek+0xeb/0x170 fs/read_write.c:304 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 other info that might help us debug this: Chain exists of: &sb->s_type->i_mutex_key#11 --> &mm->mmap_sem --> ashmem_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ashmem_mutex); lock(&mm->mmap_sem); lock(ashmem_mutex); lock(&sb->s_type->i_mutex_key#11); *** DEADLOCK *** 1 lock held by syz-executor2/10296: #0: (ashmem_mutex){+.+.}, at: [<000000003e60ff8a>] ashmem_llseek+0x56/0x1f0 drivers/staging/android/ashmem.c:326 stack backtrace: CPU: 1 PID: 10296 Comm: syz-executor2 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 print_circular_bug.isra.38+0x2cd/0x2dc kernel/locking/lockdep.c:1223 check_prev_add kernel/locking/lockdep.c:1863 [inline] check_prevs_add kernel/locking/lockdep.c:1976 [inline] validate_chain kernel/locking/lockdep.c:2417 [inline] __lock_acquire+0x30a8/0x3e00 kernel/locking/lockdep.c:3431 lock_acquire+0x1d5/0x580 kernel/locking/lockdep.c:3920 down_write+0x87/0x120 kernel/locking/rwsem.c:70 inode_lock include/linux/fs.h:713 [inline] shmem_file_llseek+0xef/0x240 mm/shmem.c:2579 vfs_llseek+0xa2/0xd0 fs/read_write.c:300 ashmem_llseek+0xe7/0x1f0 drivers/staging/android/ashmem.c:338 vfs_llseek fs/read_write.c:300 [inline] SYSC_lseek fs/read_write.c:313 [inline] SyS_lseek+0xeb/0x170 fs/read_write.c:304 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007f3150545c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000008 RAX: ffffffffffffffda RBX: 00007f31505466d4 RCX: 0000000000453e69 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000015 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000003da R14: 00000000006f5d10 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 10573 Comm: syz-executor4 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 kmem_cache_zalloc include/linux/slab.h:691 [inline] alloc_posix_timer kernel/time/posix-timers.c:458 [inline] do_timer_create+0x152/0x1610 kernel/time/posix-timers.c:511 SYSC_timer_create kernel/time/posix-timers.c:586 [inline] SyS_timer_create+0xf9/0x120 kernel/time/posix-timers.c:577 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007fb022b8ac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000de RAX: ffffffffffffffda RBX: 00007fb022b8b6d4 RCX: 0000000000453e69 RDX: 0000000020044000 RSI: 0000000020547fa8 RDI: 0000000000000003 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 0000000000000655 R14: 00000000006f9898 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 10606 Comm: syz-executor0 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 anon_vma_chain_alloc mm/rmap.c:128 [inline] __anon_vma_prepare+0xbc/0x6b0 mm/rmap.c:182 anon_vma_prepare include/linux/rmap.h:153 [inline] do_huge_pmd_anonymous_page+0x1049/0x19e0 mm/huge_memory.c:678 create_huge_pmd mm/memory.c:3870 [inline] __handle_mm_fault+0x178a/0x38c0 mm/memory.c:4074 handle_mm_fault+0x44a/0xb10 mm/memory.c:4140 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1422 do_page_fault+0xee/0x730 arch/x86/mm/fault.c:1497 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1151 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66 RSP: 0018:ffff8801cc477c98 EFLAGS: 00010202 RAX: ffffed003988efa2 RBX: 0000000000000010 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffff8801cc477d00 RDI: 0000000020000080 RBP: ffff8801cc477cc8 R08: 0000000000000000 R09: ffffed003988efa2 R10: 0000000000000002 R11: ffffed003988efa1 R12: 0000000020000080 R13: ffff8801cc477d00 R14: 00007ffffffff000 R15: 0000000020000090 copy_to_user include/linux/uaccess.h:155 [inline] put_timespec64+0xef/0x180 kernel/time/time.c:867 SYSC_clock_gettime kernel/time/posix-timers.c:1068 [inline] SyS_clock_gettime+0x12f/0x160 kernel/time/posix-timers.c:1056 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007ffb74e6dc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 00007ffb74e6e6d4 RCX: 0000000000453e69 RDX: 0000000000000000 RSI: 0000000020000080 RDI: fffbffeffffffff1 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 000000000000004e R14: 00000000006f07f0 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 10619 Comm: syz-executor0 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] kmem_cache_alloc+0x47/0x760 mm/slab.c:3539 anon_vma_alloc mm/rmap.c:81 [inline] __anon_vma_prepare+0x39d/0x6b0 mm/rmap.c:189 anon_vma_prepare include/linux/rmap.h:153 [inline] do_huge_pmd_anonymous_page+0x1049/0x19e0 mm/huge_memory.c:678 create_huge_pmd mm/memory.c:3870 [inline] __handle_mm_fault+0x178a/0x38c0 mm/memory.c:4074 handle_mm_fault+0x44a/0xb10 mm/memory.c:4140 __do_page_fault+0x5c9/0xc90 arch/x86/mm/fault.c:1422 do_page_fault+0xee/0x730 arch/x86/mm/fault.c:1497 page_fault+0x25/0x50 arch/x86/entry/entry_64.S:1151 RIP: 0010:copy_user_generic_unrolled+0x89/0xc0 arch/x86/lib/copy_user_64.S:66 RSP: 0018:ffff8801cbaa7c98 EFLAGS: 00010202 RAX: ffffed0039754fa2 RBX: 0000000000000010 RCX: 0000000000000002 RDX: 0000000000000000 RSI: ffff8801cbaa7d00 RDI: 0000000020000080 RBP: ffff8801cbaa7cc8 R08: 0000000000000000 R09: ffffed0039754fa2 R10: 0000000000000002 R11: ffffed0039754fa1 R12: 0000000020000080 R13: ffff8801cbaa7d00 R14: 00007ffffffff000 R15: 0000000020000090 copy_to_user include/linux/uaccess.h:155 [inline] put_timespec64+0xef/0x180 kernel/time/time.c:867 SYSC_clock_gettime kernel/time/posix-timers.c:1068 [inline] SyS_clock_gettime+0x12f/0x160 kernel/time/posix-timers.c:1056 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007ffb74e6dc68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e4 RAX: ffffffffffffffda RBX: 00007ffb74e6e6d4 RCX: 0000000000453e69 RDX: 0000000000000000 RSI: 0000000020000080 RDI: fffbffeffffffff1 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000013 R13: 000000000000004e R14: 00000000006f07f0 R15: 0000000000000001 CPU: 1 PID: 10625 Comm: syz-executor5 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc_node mm/slab.c:3286 [inline] kmem_cache_alloc_node_trace+0x5a/0x760 mm/slab.c:3648 __do_kmalloc_node mm/slab.c:3668 [inline] __kmalloc_node+0x33/0x70 mm/slab.c:3676 kmalloc_node include/linux/slab.h:554 [inline] kvmalloc_node+0x64/0xd0 mm/util.c:419 kvmalloc include/linux/mm.h:541 [inline] kvzalloc include/linux/mm.h:549 [inline] alloc_netdev_mqs+0x16d/0xfb0 net/core/dev.c:8303 tun_set_iff drivers/net/tun.c:2540 [inline] __tun_chr_ioctl+0x14c2/0x40d0 drivers/net/tun.c:2820 tun_chr_ioctl+0x2a/0x40 drivers/net/tun.c:3077 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 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007f3697f35c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f3697f366d4 RCX: 0000000000453e69 RDX: 00000000200000c0 RSI: 00000000400454ca RDI: 0000000000000013 RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000014 R13: 0000000000000323 R14: 00000000006f4be8 R15: 0000000000000000 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 10647 Comm: syz-executor7 Not tainted 4.16.0-rc4+ #348 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+0x194/0x24d lib/dump_stack.c:53 fail_dump lib/fault-inject.c:51 [inline] should_fail+0x8c0/0xa40 lib/fault-inject.c:149 should_failslab+0xec/0x120 mm/failslab.c:32 slab_pre_alloc_hook mm/slab.h:422 [inline] slab_alloc mm/slab.c:3365 [inline] __do_kmalloc mm/slab.c:3703 [inline] __kmalloc_track_caller+0x5f/0x760 mm/slab.c:3720 memdup_user+0x2c/0x90 mm/util.c:160 do_ip_setsockopt.isra.12+0x12d6/0x3210 net/ipv4/ip_sockglue.c:943 ip_setsockopt+0x3a/0xa0 net/ipv4/ip_sockglue.c:1252 tcp_setsockopt+0x82/0xd0 net/ipv4/tcp.c:2905 sock_common_setsockopt+0x95/0xd0 net/core/sock.c:2975 SYSC_setsockopt net/socket.c:1849 [inline] SyS_setsockopt+0x189/0x360 net/socket.c:1828 do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x453e69 RSP: 002b:00007fb6624fac68 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 00007fb6624fb6d4 RCX: 0000000000453e69 RDX: 0000000000000029 RSI: 0000000000000000 RDI: 0000000000000013 RBP: 000000000072bf58 R08: 0000000000000010 R09: 0000000000000000 R10: 0000000020b50fdc R11: 0000000000000246 R12: 0000000000000014 R13: 000000000000053c R14: 00000000006f7e40 R15: 0000000000000000 QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl capability: warning: `syz-executor4' uses deprecated v2 capabilities in a way that may be insecure