====================================================== WARNING: possible circular locking dependency detected 5.13.0-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.0/9831 is trying to acquire lock: ffffffff8cfd6720 (fs_reclaim){+.+.}-{0:0}, at: __fs_reclaim_acquire+0x0/0x30 mm/page_alloc.c:4222 but task is already holding lock: ffff8880b9b31088 (lock#2){-.-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (lock#2){-.-.}-{2:2}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 local_lock_acquire+0x23/0x130 include/linux/local_lock_internal.h:42 free_unref_page+0x242/0x550 mm/page_alloc.c:3439 mm_free_pgd kernel/fork.c:636 [inline] __mmdrop+0xae/0x3f0 kernel/fork.c:687 mmdrop include/linux/sched/mm.h:49 [inline] finish_task_switch+0x221/0x630 kernel/sched/core.c:4582 context_switch kernel/sched/core.c:4686 [inline] __schedule+0xc0f/0x11f0 kernel/sched/core.c:5940 schedule+0x14b/0x210 kernel/sched/core.c:6019 rwsem_down_write_slowpath+0xec7/0x14c0 kernel/locking/rwsem.c:1106 __down_write_common kernel/locking/rwsem.c:1261 [inline] __down_write kernel/locking/rwsem.c:1270 [inline] down_write+0x165/0x170 kernel/locking/rwsem.c:1407 i_mmap_lock_write include/linux/fs.h:494 [inline] unlink_file_vma+0x7c/0x1b0 mm/mmap.c:171 free_pgtables+0x198/0x2d0 mm/memory.c:427 exit_mmap+0x3fc/0x7a0 mm/mmap.c:3203 __mmput+0x111/0x370 kernel/fork.c:1101 exec_mmap+0x50e/0x610 fs/exec.c:1031 begin_new_exec+0x6ac/0x1190 fs/exec.c:1287 load_elf_binary+0x836/0x3bd0 fs/binfmt_elf.c:1001 search_binary_handler fs/exec.c:1724 [inline] exec_binprm fs/exec.c:1765 [inline] bprm_execve+0x8eb/0x1470 fs/exec.c:1834 do_execveat_common+0x451/0x5a0 fs/exec.c:1923 do_execve fs/exec.c:1991 [inline] __do_sys_execve fs/exec.c:2067 [inline] __se_sys_execve fs/exec.c:2062 [inline] __x64_sys_execve+0x8e/0xa0 fs/exec.c:2062 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&mapping->i_mmap_rwsem){++++}-{3:3}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 down_write+0x97/0x170 kernel/locking/rwsem.c:1406 i_mmap_lock_write include/linux/fs.h:494 [inline] dma_resv_lockdep+0x3b5/0x63a drivers/dma-buf/dma-resv.c:689 do_one_initcall+0x1a7/0x400 init/main.c:1246 do_initcall_level+0x14a/0x1f5 init/main.c:1319 do_initcalls+0x4b/0x8c init/main.c:1335 kernel_init_freeable+0x3f1/0x57e init/main.c:1557 kernel_init+0x19/0x2a0 init/main.c:1449 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 (fs_reclaim){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4564 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4578 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5176 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5375 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3066 n_tty_open+0x19/0x150 drivers/tty/n_tty.c:1914 tty_ldisc_open drivers/tty/tty_ldisc.c:464 [inline] tty_ldisc_setup+0x1ba/0x3c0 drivers/tty/tty_ldisc.c:791 tty_init_dev+0x271/0x4c0 drivers/tty/tty_io.c:1461 ptmx_open+0xdb/0x2c0 drivers/tty/pty.c:851 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3361 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3494 do_filp_open+0x221/0x460 fs/namei.c:3521 do_sys_openat2+0x124/0x460 fs/open.c:1195 do_sys_open fs/open.c:1211 [inline] __do_sys_openat fs/open.c:1227 [inline] __se_sys_openat fs/open.c:1222 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1222 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: fs_reclaim --> &mapping->i_mmap_rwsem --> lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(lock#2); lock(&mapping->i_mmap_rwsem); lock(lock#2); lock(fs_reclaim); *** DEADLOCK *** 4 locks held by syz-executor.0/9831: #0: ffffffff8d5ca708 (tty_mutex){+.+.}-{3:3}, at: ptmx_open+0xcd/0x2c0 drivers/tty/pty.c:850 #1: ffff888023a381c0 (&tty->legacy_mutex){+.+.}-{3:3}, at: tty_init_dev+0x6a/0x4c0 drivers/tty/tty_io.c:1436 #2: ffff888023a38098 (&tty->ldisc_sem){++++}-{0:0}, at: __tty_ldisc_lock drivers/tty/tty_ldisc.c:315 [inline] #2: ffff888023a38098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_lock+0x6a/0xb0 drivers/tty/tty_ldisc.c:339 #3: ffff8880b9b31088 (lock#2){-.-.}-{2:2}, at: local_lock_acquire+0x7/0x130 include/linux/local_lock_internal.h:41 stack backtrace: CPU: 1 PID: 9831 Comm: syz-executor.0 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:96 print_circular_bug+0xb17/0xdc0 kernel/locking/lockdep.c:2009 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __fs_reclaim_acquire+0x20/0x30 mm/page_alloc.c:4564 fs_reclaim_acquire+0x59/0xf0 mm/page_alloc.c:4578 prepare_alloc_pages+0x151/0x5a0 mm/page_alloc.c:5176 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5375 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3066 n_tty_open+0x19/0x150 drivers/tty/n_tty.c:1914 tty_ldisc_open drivers/tty/tty_ldisc.c:464 [inline] tty_ldisc_setup+0x1ba/0x3c0 drivers/tty/tty_ldisc.c:791 tty_init_dev+0x271/0x4c0 drivers/tty/tty_io.c:1461 ptmx_open+0xdb/0x2c0 drivers/tty/pty.c:851 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3361 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3494 do_filp_open+0x221/0x460 fs/namei.c:3521 do_sys_openat2+0x124/0x460 fs/open.c:1195 do_sys_open fs/open.c:1211 [inline] __do_sys_openat fs/open.c:1227 [inline] __se_sys_openat fs/open.c:1222 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1222 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8762545188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffeb5a5aaef R14: 00007f8762545300 R15: 0000000000022000 BUG: sleeping function called from invalid context at mm/page_alloc.c:5179 in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 9831, name: syz-executor.0 INFO: lockdep is turned off. irq event stamp: 2518 hardirqs last enabled at (2517): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] hardirqs last enabled at (2517): [] _raw_spin_unlock_irqrestore+0x8b/0x120 kernel/locking/spinlock.c:191 hardirqs last disabled at (2518): [] __alloc_pages_bulk+0x801/0x1090 mm/page_alloc.c:5291 softirqs last enabled at (842): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last enabled at (842): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 softirqs last disabled at (831): [] invoke_softirq kernel/softirq.c:432 [inline] softirqs last disabled at (831): [] __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 CPU: 1 PID: 9831 Comm: syz-executor.0 Not tainted 5.13.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:96 ___might_sleep+0x4e5/0x6b0 kernel/sched/core.c:9153 prepare_alloc_pages+0x1c0/0x5a0 mm/page_alloc.c:5179 __alloc_pages+0x14d/0x5f0 mm/page_alloc.c:5375 stack_depot_save+0x361/0x490 lib/stackdepot.c:303 save_stack+0xf9/0x1f0 mm/page_owner.c:120 __set_page_owner+0x42/0x2f0 mm/page_owner.c:181 prep_new_page mm/page_alloc.c:2445 [inline] __alloc_pages_bulk+0x9f2/0x1090 mm/page_alloc.c:5313 alloc_pages_bulk_array_node include/linux/gfp.h:557 [inline] vm_area_alloc_pages mm/vmalloc.c:2775 [inline] __vmalloc_area_node mm/vmalloc.c:2845 [inline] __vmalloc_node_range+0x3ad/0x7f0 mm/vmalloc.c:2947 __vmalloc_node mm/vmalloc.c:2996 [inline] vzalloc+0x75/0x80 mm/vmalloc.c:3066 n_tty_open+0x19/0x150 drivers/tty/n_tty.c:1914 tty_ldisc_open drivers/tty/tty_ldisc.c:464 [inline] tty_ldisc_setup+0x1ba/0x3c0 drivers/tty/tty_ldisc.c:791 tty_init_dev+0x271/0x4c0 drivers/tty/tty_io.c:1461 ptmx_open+0xdb/0x2c0 drivers/tty/pty.c:851 chrdev_open+0x53b/0x5f0 fs/char_dev.c:414 do_dentry_open+0x7cb/0x1010 fs/open.c:826 do_open fs/namei.c:3361 [inline] path_openat+0x28e6/0x39b0 fs/namei.c:3494 do_filp_open+0x221/0x460 fs/namei.c:3521 do_sys_openat2+0x124/0x460 fs/open.c:1195 do_sys_open fs/open.c:1211 [inline] __do_sys_openat fs/open.c:1227 [inline] __se_sys_openat fs/open.c:1222 [inline] __x64_sys_openat+0x243/0x290 fs/open.c:1222 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8762545188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffeb5a5aaef R14: 00007f8762545300 R15: 0000000000022000