===================================== WARNING: bad unlock balance detected! 6.14.0-rc5-syzkaller-g77c95b8c7a16 #0 Not tainted ------------------------------------- syz.3.64/6791 is trying to release lock (&mm->mmap_lock) at: [] mmap_read_unlock include/linux/mmap_lock.h:217 [inline] [] __mm_populate+0x328/0x3d8 mm/gup.c:2044 but there are no more locks to release! other info that might help us debug this: no locks held by syz.3.64/6791. stack backtrace: CPU: 1 UID: 0 PID: 6791 Comm: syz.3.64 Not tainted 6.14.0-rc5-syzkaller-g77c95b8c7a16 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:120 dump_stack+0x1c/0x28 lib/dump_stack.c:129 print_unlock_imbalance_bug+0x254/0x2ac kernel/locking/lockdep.c:5289 __lock_release kernel/locking/lockdep.c:5518 [inline] lock_release+0x410/0x9e4 kernel/locking/lockdep.c:5872 up_read+0x24/0x3c kernel/locking/rwsem.c:1619 mmap_read_unlock include/linux/mmap_lock.h:217 [inline] __mm_populate+0x328/0x3d8 mm/gup.c:2044 mm_populate include/linux/mm.h:3386 [inline] vm_mmap_pgoff+0x304/0x3c4 mm/util.c:580 ksys_mmap_pgoff+0x3a4/0x5c8 mm/mmap.c:607 __do_sys_mmap arch/arm64/kernel/sys.c:28 [inline] __se_sys_mmap arch/arm64/kernel/sys.c:21 [inline] __arm64_sys_mmap+0xf8/0x110 arch/arm64/kernel/sys.c:21 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 6791 at kernel/locking/rwsem.c:252 rwsem_read_trylock kernel/locking/rwsem.c:253 [inline] WARNING: CPU: 1 PID: 6791 at kernel/locking/rwsem.c:252 __down_read_common kernel/locking/rwsem.c:1247 [inline] WARNING: CPU: 1 PID: 6791 at kernel/locking/rwsem.c:252 __down_read kernel/locking/rwsem.c:1261 [inline] WARNING: CPU: 1 PID: 6791 at kernel/locking/rwsem.c:252 down_read+0x2f0/0x2fc kernel/locking/rwsem.c:1526 Modules linked in: CPU: 1 UID: 0 PID: 6791 Comm: syz.3.64 Not tainted 6.14.0-rc5-syzkaller-g77c95b8c7a16 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : rwsem_read_trylock kernel/locking/rwsem.c:253 [inline] pc : __down_read_common kernel/locking/rwsem.c:1247 [inline] pc : __down_read kernel/locking/rwsem.c:1261 [inline] pc : down_read+0x2f0/0x2fc kernel/locking/rwsem.c:1526 lr : instrument_atomic_read_write include/linux/instrumented.h:96 [inline] lr : atomic_long_add_return_acquire include/linux/atomic/atomic-instrumented.h:3297 [inline] lr : rwsem_read_trylock kernel/locking/rwsem.c:250 [inline] lr : __down_read_common kernel/locking/rwsem.c:1247 [inline] lr : __down_read kernel/locking/rwsem.c:1261 [inline] lr : down_read+0x6c/0x2fc kernel/locking/rwsem.c:1526 sp : ffff8000a0bc77d0 x29: ffff8000a0bc77d0 x28: ffff700014178f84 x27: 1ffff00014178f50 x26: ffff0000d71f8000 x25: 1fffe0001ae3f0a3 x24: dfff800000000000 x23: 0000000000000002 x22: ffff0000c52c4560 x21: ffff0000d71f8518 x20: ffffffffffffff00 x19: ffff0000c52c4560 x18: 0000ffff97fe7fff x17: 0000000000000000 x16: ffff800080bf8c6c x15: 0000000000000001 x14: 1fffe00018a588ac x13: 0000000000000000 x12: 0000000000000000 x11: ffff600018a588ad x10: 1fffe00018a588ac x9 : dfff800000000000 x8 : fffffffffffffe00 x7 : 0000000000000000 x6 : ffff8000803088a4 x5 : 0000000000000000 x4 : 0000000000000001 x3 : ffff80008b7df83c x2 : 0000000000000001 x1 : 0000000000000008 x0 : ffff0000c52c4560 Call trace: rwsem_read_trylock kernel/locking/rwsem.c:253 [inline] (P) __down_read_common kernel/locking/rwsem.c:1247 [inline] (P) __down_read kernel/locking/rwsem.c:1261 [inline] (P) down_read+0x2f0/0x2fc kernel/locking/rwsem.c:1526 (P) mmap_read_lock include/linux/mmap_lock.h:190 [inline] exit_mm+0x6c/0x210 kernel/exit.c:546 do_exit+0x46c/0x1acc kernel/exit.c:925 do_group_exit+0x194/0x22c kernel/exit.c:1087 get_signal+0x13e4/0x1500 kernel/signal.c:3036 do_signal+0x22c/0x3a04 arch/arm64/kernel/signal.c:1658 do_notify_resume+0x74/0x1f4 arch/arm64/kernel/entry-common.c:148 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:169 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:178 [inline] el0_svc+0xac/0x168 arch/arm64/kernel/entry-common.c:745 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 irq event stamp: 78559 hardirqs last enabled at (78559): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (78559): [] _raw_spin_unlock_irqrestore+0x38/0x98 kernel/locking/spinlock.c:194 hardirqs last disabled at (78558): [] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:108 [inline] hardirqs last disabled at (78558): [] _raw_spin_lock_irqsave+0x2c/0x7c kernel/locking/spinlock.c:162 softirqs last enabled at (78426): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (78424): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]---