cannot load conntrack support for proto=2 ====================================================== WARNING: possible circular locking dependency detected 4.14.289-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.2/13840 is trying to acquire lock: (sb_writers#6){.+.+}, at: [] file_start_write include/linux/fs.h:2714 [inline] (sb_writers#6){.+.+}, at: [] vfs_fallocate+0x5c1/0x790 fs/open.c:318 but task is already holding lock: (ashmem_mutex){+.+.}, at: [] ashmem_shrink_scan drivers/staging/android/ashmem.c:494 [inline] (ashmem_mutex){+.+.}, at: [] ashmem_ioctl+0x27e/0xd00 drivers/staging/android/ashmem.c:843 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (ashmem_mutex){+.+.}: __mutex_lock_common kernel/locking/mutex.c:756 [inline] __mutex_lock+0xc4/0x1310 kernel/locking/mutex.c:893 ashmem_mmap+0x50/0x5c0 drivers/staging/android/ashmem.c:393 call_mmap include/linux/fs.h:1785 [inline] mmap_region+0xa1a/0x1220 mm/mmap.c:1717 do_mmap+0x5b3/0xcb0 mm/mmap.c:1495 do_mmap_pgoff include/linux/mm.h:2187 [inline] vm_mmap_pgoff+0x14e/0x1a0 mm/util.c:366 SYSC_mmap_pgoff mm/mmap.c:1545 [inline] SyS_mmap_pgoff+0x249/0x510 mm/mmap.c:1503 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #2 (&mm->mmap_sem){++++}: __might_fault mm/memory.c:4705 [inline] __might_fault+0x137/0x1b0 mm/memory.c:4690 _copy_to_user+0x27/0xd0 lib/usercopy.c:25 copy_to_user include/linux/uaccess.h:155 [inline] filldir+0x1d5/0x390 fs/readdir.c:237 dir_emit_dot include/linux/fs.h:3361 [inline] dir_emit_dots include/linux/fs.h:3372 [inline] dcache_readdir+0x180/0x860 fs/libfs.c:192 iterate_dir+0x1a0/0x5e0 fs/readdir.c:52 SYSC_getdents fs/readdir.c:272 [inline] SyS_getdents+0x125/0x240 fs/readdir.c:253 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #1 (&type->i_mutex_dir_key#5){++++}: down_write+0x34/0x90 kernel/locking/rwsem.c:54 inode_lock include/linux/fs.h:719 [inline] do_last fs/namei.c:3331 [inline] path_openat+0xde2/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb -> #0 (sb_writers#6){.+.+}: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 file_start_write include/linux/fs.h:2714 [inline] vfs_fallocate+0x5c1/0x790 fs/open.c:318 ashmem_shrink_scan.part.0+0x135/0x3d0 drivers/staging/android/ashmem.c:501 ashmem_shrink_scan drivers/staging/android/ashmem.c:494 [inline] ashmem_ioctl+0x294/0xd00 drivers/staging/android/ashmem.c:843 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb other info that might help us debug this: Chain exists of: sb_writers#6 --> &mm->mmap_sem --> ashmem_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ashmem_mutex); lock(&mm->mmap_sem); lock(ashmem_mutex); lock(sb_writers#6); *** DEADLOCK *** 1 lock held by syz-executor.2/13840: #0: (ashmem_mutex){+.+.}, at: [] ashmem_shrink_scan drivers/staging/android/ashmem.c:494 [inline] #0: (ashmem_mutex){+.+.}, at: [] ashmem_ioctl+0x27e/0xd00 drivers/staging/android/ashmem.c:843 stack backtrace: CPU: 1 PID: 13840 Comm: syz-executor.2 Not tainted 4.14.289-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_circular_bug.constprop.0.cold+0x2d7/0x41e kernel/locking/lockdep.c:1258 check_prev_add kernel/locking/lockdep.c:1905 [inline] check_prevs_add kernel/locking/lockdep.c:2022 [inline] validate_chain kernel/locking/lockdep.c:2464 [inline] __lock_acquire+0x2e0e/0x3f20 kernel/locking/lockdep.c:3491 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:36 [inline] percpu_down_read include/linux/percpu-rwsem.h:59 [inline] __sb_start_write+0x64/0x260 fs/super.c:1342 file_start_write include/linux/fs.h:2714 [inline] vfs_fallocate+0x5c1/0x790 fs/open.c:318 ashmem_shrink_scan.part.0+0x135/0x3d0 drivers/staging/android/ashmem.c:501 ashmem_shrink_scan drivers/staging/android/ashmem.c:494 [inline] ashmem_ioctl+0x294/0xd00 drivers/staging/android/ashmem.c:843 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f7858c3c209 RSP: 002b:00007f78575b1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f7858d4ef60 RCX: 00007f7858c3c209 RDX: 0000000000000000 RSI: 000000000000770a RDI: 0000000000000004 RBP: 00007f7858c96161 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdccbc111f R14: 00007f78575b1300 R15: 0000000000022000 UDF-fs: error (device loop1): udf_process_sequence: Block 99 of volume descriptor sequence is corrupted or we could not read it kauditd_printk_skb: 3 callbacks suppressed audit: type=1804 audit(1659098013.563:61): pid=13841 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir584757427/syzkaller.f845tw/128/file2" dev="sda1" ino=14340 res=1 UDF-fs: error (device loop1): udf_process_sequence: Block 1984 of volume descriptor sequence is corrupted or we could not read it audit: type=1804 audit(1659098013.703:62): pid=13864 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir584757427/syzkaller.f845tw/129/file2" dev="sda1" ino=14341 res=1 UDF-fs: Scanning with blocksize 512 failed UDF-fs: warning (device loop1): udf_load_vrs: No anchor found audit: type=1804 audit(1659098013.844:63): pid=13878 uid=0 auid=4294967295 ses=4294967295 op="invalid_pcr" cause="open_writers" comm="syz-executor.0" name="/root/syzkaller-testdir584757427/syzkaller.f845tw/130/file2" dev="sda1" ino=14316 res=1 UDF-fs: Scanning with blocksize 1024 failed UDF-fs: warning (device loop1): udf_load_vrs: No anchor found UDF-fs: Scanning with blocksize 2048 failed UDF-fs: warning (device loop1): udf_load_vrs: No VRS found UDF-fs: Scanning with blocksize 4096 failed divide error: 0000 [#1] PREEMPT SMP KASAN Modules linked in: CPU: 0 PID: 13925 Comm: syz-executor.3 Not tainted 4.14.289-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 task: ffff8880651aa5c0 task.stack: ffff888065120000 RIP: 0010:fbcon_init+0xcb4/0x1cc0 drivers/video/fbdev/core/fbcon.c:1065 RSP: 0018:ffff8880651277e0 EFLAGS: 00010246 RAX: 0000000000000030 RBX: ffff8880b08fd080 RCX: ffffc9000909e000 RDX: 0000000000000000 RSI: ffff888092dda634 RDI: ffff8880b08fd238 RBP: ffff888092dda280 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8880651aa5c0 R12: ffff8880b0b50e00 R13: 0000000000000008 R14: ffff888092dda5b4 R15: 0000000000000030 FS: 00007f3a9b3e6700(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f3a9b3e5d38 CR3: 00000000981ad000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: visual_init+0x332/0x5e0 drivers/tty/vt/vt.c:746 vc_allocate+0x2c5/0x640 drivers/tty/vt/vt.c:802 con_install+0x4d/0x450 drivers/tty/vt/vt.c:2916 tty_driver_install_tty drivers/tty/tty_io.c:1225 [inline] tty_init_dev.part.0+0x99/0x400 drivers/tty/tty_io.c:1338 tty_init_dev drivers/tty/tty_io.c:1328 [inline] tty_open_by_driver drivers/tty/tty_io.c:1973 [inline] tty_open+0x669/0x8b0 drivers/tty/tty_io.c:2021 chrdev_open+0x23c/0x6d0 fs/char_dev.c:423 do_dentry_open+0x44b/0xec0 fs/open.c:777 vfs_open+0x105/0x220 fs/open.c:888 do_last fs/namei.c:3428 [inline] path_openat+0x628/0x2970 fs/namei.c:3569 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f3a9ca24124 RSP: 002b:00007f3a9b3e5ca0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f3a9cb83f60 RCX: 00007f3a9ca24124 RDX: 0000000000000002 RSI: 00007f3a9b3e5d40 RDI: 00000000ffffff9c RBP: 00007f3a9b3e5d40 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000002 R13: 00007ffda5550e0f R14: 00007f3a9b3e6300 R15: 0000000000022000 Code: 54 24 30 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 8d 0d 00 00 31 d2 44 89 f8 48 8b 74 24 38 b5 b0 03 00 00 48 89 f2 48 c1 ea 03 89 44 24 30 48 b8 00 00 RIP: fbcon_init+0xcb4/0x1cc0 drivers/video/fbdev/core/fbcon.c:1065 RSP: ffff8880651277e0 ---[ end trace 606c74f117571996 ]--- ---------------- Code disassembly (best guess): 0: 54 push %rsp 1: 24 30 and $0x30,%al 3: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax a: fc ff df d: 48 c1 ea 03 shr $0x3,%rdx 11: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 15: 84 c0 test %al,%al 17: 74 08 je 0x21 19: 3c 03 cmp $0x3,%al 1b: 0f 8e 8d 0d 00 00 jle 0xdae 21: 31 d2 xor %edx,%edx 23: 44 89 f8 mov %r15d,%eax 26: 48 8b 74 24 38 mov 0x38(%rsp),%rsi * 2b: f7 b5 b0 03 00 00 divl 0x3b0(%rbp) <-- trapping instruction 31: 48 89 f2 mov %rsi,%rdx 34: 48 c1 ea 03 shr $0x3,%rdx 38: 89 44 24 30 mov %eax,0x30(%rsp) 3c: 48 rex.W 3d: b8 .byte 0xb8