On 01/18/2015 01:36 PM, Konstantin Khlebnikov wrote: > On Sun, Jan 18, 2015 at 2:34 PM, Sasha Levin <sasha.levin@xxxxxxxxxx> wrote: >> On 06/24/2014 04:16 PM, Konstantin Khlebnikov wrote: >>> This patch prints warning (if CONFIG_DEBUG_VM=y) when >>> memory commitment becomes too negative. >>> >>> Signed-off-by: Konstantin Khlebnikov <koct9i@xxxxxxxxx> >> >> Hi Konstantin, >> >> I seem to be hitting this warning when fuzzing on the latest -next kernel: > > That might be unexpected change of shmem file which holds anon-vma data, > thanks to checkpoint-restore they are expoted via /proc/.../map_files > > I've fixed truncate (https://lkml.org/lkml/2014/6/24/729) but there > are some other ways > to change i_size: write, fallocate and maybe something else. deja vu! With the latest -next: [ 884.898243] ------------[ cut here ]------------ [ 884.899983] ------------[ cut here ]------------ [ 884.900013] WARNING: CPU: 5 PID: 17543 at mm/mmap.c:159 __vm_enough_memory+0x3b7/0x440() [ 884.900017] ------------[ cut here ]------------ [ 884.900155] memory commitment underflow [ 884.900158] Modules linked in: [ 884.900167] CPU: 5 PID: 17543 Comm: trinity-c102 Not tainted 4.0.0-next-20150424-sasha-00038-ga61bf14 #2171 [ 884.900180] WARNING: CPU: 0 PID: 18483 at mm/mmap.c:159 __vm_enough_memory+0x3b7/0x440() [ 884.900185] ffff88017e180000 [ 884.900188] memory commitment underflow [ 884.900190] 0000000012331894 [ 884.900193] Modules linked in: [ 884.900195] ffff8807dd8bf5a8 [ 884.900196] [ 884.900200] ffffffffa9abbf32 [ 884.900211] 0000000000000000 ffff8807dd8bf628 ffff8807dd8bf5f8 ffffffff9f1f1c2a [ 884.900222] ffff8807dd8bf5d8 ffffffff9f5efb27 ffff8807dd8bf628 ffffed00fbb17ec1 [ 884.900230] Call Trace: [ 884.900247] dump_stack (lib/dump_stack.c:52) [ 884.900260] warn_slowpath_common (kernel/panic.c:447) [ 884.900270] ? __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 884.900278] warn_slowpath_fmt (kernel/panic.c:453) [ 884.900286] ? warn_slowpath_common (kernel/panic.c:453) [ 884.900300] ? find_get_entry (include/linux/rcupdate.h:969 mm/filemap.c:1003) [ 884.900310] __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 884.900317] ? find_get_entry (mm/filemap.c:967) [ 884.900334] cap_vm_enough_memory (security/commoncap.c:954) [ 884.900344] security_vm_enough_memory_mm (security/security.c:235) [ 884.900355] shmem_getpage_gfp (mm/shmem.c:1156) [ 884.900369] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) [ 884.900382] ? lockdep_init (include/linux/list.h:28 kernel/locking/lockdep.c:4065) [ 884.900391] ? shmem_add_to_page_cache (mm/shmem.c:1034) [ 884.900402] ? __wake_up_locked_key (kernel/sched/wait.c:456) [ 884.900414] ? __bdi_update_bandwidth (mm/page-writeback.c:1579) [ 884.900422] ? __lock_is_held (kernel/locking/lockdep.c:3572) [ 884.900432] ? iov_iter_single_seg_count (lib/iov_iter.c:310) [ 884.900441] shmem_write_begin (mm/shmem.c:1492) [ 884.900450] generic_perform_write (mm/filemap.c:2467) [ 884.900461] ? generic_write_checks (mm/filemap.c:2427) [ 884.900475] ? file_update_time (fs/inode.c:1746) [ 884.900483] ? file_remove_suid (fs/inode.c:1718) [ 884.900492] ? generic_file_write_iter (include/linux/sched.h:3091 include/linux/sched.h:3102 mm/filemap.c:2269 mm/filemap.c:2622) [ 884.900501] ? mutex_trylock (kernel/locking/mutex.c:615) [ 884.900510] __generic_file_write_iter (mm/filemap.c:2597) [ 884.900521] ? get_parent_ip (kernel/sched/core.c:2556) [ 884.900531] generic_file_write_iter (mm/filemap.c:2625) [ 884.900543] do_iter_readv_writev (fs/read_write.c:665) [ 884.900551] ? do_readv_writev (include/linux/fs.h:2417 fs/read_write.c:804) [ 884.900558] ? do_loop_readv_writev (fs/read_write.c:657) [ 884.900567] ? rw_verify_area (fs/read_write.c:406 (discriminator 4)) [ 884.900576] do_readv_writev (fs/read_write.c:808) [ 884.900583] ? __generic_file_write_iter (mm/filemap.c:2616) [ 884.900591] ? vfs_write (fs/read_write.c:777) [ 884.900601] ? debug_smp_processor_id (lib/smp_processor_id.c:57) [ 884.900609] ? get_lock_stats (kernel/locking/lockdep.c:249) [ 884.900621] ? vtime_account_user (kernel/sched/cputime.c:701) [ 884.900630] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [ 884.900639] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2594 kernel/locking/lockdep.c:2636) [ 884.900646] ? trace_hardirqs_on (kernel/locking/lockdep.c:2644) [ 884.900654] vfs_writev (fs/read_write.c:848) [ 884.900663] SyS_writev (fs/read_write.c:881 fs/read_write.c:872) [ 884.900671] ? SyS_readv (fs/read_write.c:872) [ 884.900684] ? syscall_trace_enter_phase2 (arch/x86/kernel/ptrace.c:1592) [ 884.900693] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) [ 884.900703] tracesys_phase2 (arch/x86/kernel/entry_64.S:337) [ 884.900716] ? __percpu_counter_sum (lib/percpu_counter.c:107) [ 884.900723] ---[ end trace 957b1b1a507acb40 ]--- [ 884.900730] CPU: 0 PID: 18483 Comm: trinity-c39 Not tainted 4.0.0-next-20150424-sasha-00038-ga61bf14 #2171 [ 884.900746] ffff880077ba3000 000000005dbf6d8b ffff88007bd8f5b8 ffffffffa9abbf32 [ 884.900759] 0000000000000000 ffff88007bd8f638 ffff88007bd8f608 ffffffff9f1f1c2a [ 884.900771] ffff88007bd8f618 ffffffff9f5efb27 ffffffff9f2700d0 ffffed000f7b1ec3 [ 884.900774] Call Trace: [ 884.900787] dump_stack (lib/dump_stack.c:52) [ 884.900796] warn_slowpath_common (kernel/panic.c:447) [ 884.900807] ? __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 884.900820] ? finish_task_switch (kernel/sched/sched.h:1077 kernel/sched/core.c:2245) [ 884.900830] warn_slowpath_fmt (kernel/panic.c:453) [ 884.900838] ? warn_slowpath_common (kernel/panic.c:453) [ 884.900846] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [ 884.900863] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2594 kernel/locking/lockdep.c:2636) [ 884.900873] __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 884.900883] ? find_get_entry (mm/filemap.c:967) [ 884.900895] cap_vm_enough_memory (security/commoncap.c:954) [ 884.900905] security_vm_enough_memory_mm (security/security.c:235) [ 884.900912] ? security_vm_enough_memory_mm (security/security.c:234) [ 884.900922] shmem_getpage_gfp (mm/shmem.c:1156) [ 884.900931] ? lockdep_init (include/linux/list.h:28 kernel/locking/lockdep.c:4065) [ 884.900940] ? shmem_add_to_page_cache (mm/shmem.c:1034) [ 884.900950] ? __wake_up_locked_key (kernel/sched/wait.c:456) [ 884.900960] ? __bdi_update_bandwidth (mm/page-writeback.c:1579) [ 884.900968] ? __lock_is_held (kernel/locking/lockdep.c:3572) [ 884.900977] ? iov_iter_single_seg_count (lib/iov_iter.c:310) [ 884.900986] shmem_write_begin (mm/shmem.c:1492) [ 884.900996] generic_perform_write (mm/filemap.c:2467) [ 884.901011] ? generic_write_checks (mm/filemap.c:2427) [ 884.901173] ? file_update_time (fs/inode.c:1746) [ 884.901182] ? file_remove_suid (fs/inode.c:1718) [ 884.901190] ? generic_file_write_iter (include/linux/sched.h:3091 include/linux/sched.h:3102 mm/filemap.c:2269 mm/filemap.c:2622) [ 884.901199] ? mutex_trylock (kernel/locking/mutex.c:615) [ 884.901207] __generic_file_write_iter (mm/filemap.c:2597) [ 884.901217] ? get_parent_ip (kernel/sched/core.c:2556) [ 884.901228] generic_file_write_iter (mm/filemap.c:2625) [ 884.901240] do_iter_readv_writev (fs/read_write.c:665) [ 884.901248] ? do_readv_writev (include/linux/fs.h:2417 fs/read_write.c:804) [ 884.901257] ? do_loop_readv_writev (fs/read_write.c:657) [ 884.901269] ? rw_verify_area (fs/read_write.c:406 (discriminator 4)) [ 884.901278] do_readv_writev (fs/read_write.c:808) [ 884.901288] ? __generic_file_write_iter (mm/filemap.c:2616) [ 884.901297] ? vfs_write (fs/read_write.c:777) [ 884.901306] ? debug_smp_processor_id (lib/smp_processor_id.c:57) [ 884.901314] ? get_lock_stats (kernel/locking/lockdep.c:249) [ 884.901326] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [ 884.901336] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2594 kernel/locking/lockdep.c:2636) [ 884.901345] ? trace_hardirqs_on (kernel/locking/lockdep.c:2644) [ 884.901355] vfs_writev (fs/read_write.c:848) [ 884.901365] ? __fdget_pos (fs/file.c:717) [ 884.901374] SyS_pwritev (include/linux/file.h:38 fs/read_write.c:937 fs/read_write.c:922) [ 884.901382] ? SyS_preadv (fs/read_write.c:922) [ 884.901393] ? syscall_trace_enter_phase2 (arch/x86/kernel/ptrace.c:1592) [ 884.901404] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) [ 884.901414] tracesys_phase2 (arch/x86/kernel/entry_64.S:337) [ 884.901423] ---[ end trace 957b1b1a507acb41 ]--- [ 885.133658] WARNING: CPU: 6 PID: 17218 at mm/mmap.c:159 __vm_enough_memory+0x3b7/0x440() [ 885.136475] memory commitment underflow [ 885.137807] Modules linked in: [ 885.139002] CPU: 6 PID: 17218 Comm: trinity-c296 Tainted: G W 4.0.0-next-20150424-sasha-00038-ga61bf14 #2171 [ 885.142889] ffff88078e4a8000 0000000057b5e6a5 ffff88078e6275a8 ffffffffa9abbf32 [ 885.145640] 0000000000000000 ffff88078e627628 ffff88078e6275f8 ffffffff9f1f1c2a [ 885.148334] ffff88078e6275d8 ffffffff9f5efb27 ffff88078e627628 ffffed00f1cc4ec1 [ 885.150427] Call Trace: [ 885.151080] dump_stack (lib/dump_stack.c:52) [ 885.152771] warn_slowpath_common (kernel/panic.c:447) [ 885.154819] ? __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 885.156674] warn_slowpath_fmt (kernel/panic.c:453) [ 885.158168] ? warn_slowpath_common (kernel/panic.c:453) [ 885.159853] ? find_get_entry (include/linux/rcupdate.h:969 mm/filemap.c:1003) [ 885.161311] __vm_enough_memory (mm/mmap.c:157 (discriminator 3)) [ 885.162823] ? find_get_entry (mm/filemap.c:967) [ 885.164599] cap_vm_enough_memory (security/commoncap.c:954) [ 885.166588] security_vm_enough_memory_mm (security/security.c:235) [ 885.168923] shmem_getpage_gfp (mm/shmem.c:1156) [ 885.170990] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) [ 885.173230] ? lockdep_init (include/linux/list.h:28 kernel/locking/lockdep.c:4065) [ 885.175228] ? shmem_add_to_page_cache (mm/shmem.c:1034) [ 885.177492] ? __wake_up_locked_key (kernel/sched/wait.c:456) [ 885.179648] ? __bdi_update_bandwidth (mm/page-writeback.c:1579) [ 885.181288] ? __lock_is_held (kernel/locking/lockdep.c:3572) [ 885.182750] ? __wake_up_bit (kernel/sched/wait.c:456) [ 885.184418] ? iov_iter_single_seg_count (lib/iov_iter.c:310) [ 885.186728] shmem_write_begin (mm/shmem.c:1492) [ 885.188751] generic_perform_write (mm/filemap.c:2467) [ 885.190906] ? generic_write_checks (mm/filemap.c:2427) [ 885.193252] ? file_update_time (fs/inode.c:1746) [ 885.195344] ? file_remove_suid (fs/inode.c:1718) [ 885.196996] ? generic_file_write_iter (include/linux/sched.h:3091 include/linux/sched.h:3102 mm/filemap.c:2269 mm/filemap.c:2622) [ 885.198672] ? mutex_trylock (kernel/locking/mutex.c:615) [ 885.200440] __generic_file_write_iter (mm/filemap.c:2597) [ 885.202666] ? get_parent_ip (kernel/sched/core.c:2556) [ 885.204647] generic_file_write_iter (mm/filemap.c:2625) [ 885.206875] do_iter_readv_writev (fs/read_write.c:665) [ 885.209242] ? do_readv_writev (include/linux/fs.h:2417 fs/read_write.c:804) [ 885.211306] ? do_loop_readv_writev (fs/read_write.c:657) [ 885.213414] ? rw_verify_area (fs/read_write.c:406 (discriminator 4)) [ 885.215263] do_readv_writev (fs/read_write.c:808) [ 885.216855] ? __generic_file_write_iter (mm/filemap.c:2616) [ 885.218482] ? vfs_write (fs/read_write.c:777) [ 885.219931] ? debug_smp_processor_id (lib/smp_processor_id.c:57) [ 885.222062] ? get_lock_stats (kernel/locking/lockdep.c:249) [ 885.224275] ? vtime_account_user (kernel/sched/cputime.c:701) [ 885.226375] ? __this_cpu_preempt_check (lib/smp_processor_id.c:63) [ 885.228472] ? trace_hardirqs_on_caller (kernel/locking/lockdep.c:2594 kernel/locking/lockdep.c:2636) [ 885.230673] ? trace_hardirqs_on (kernel/locking/lockdep.c:2644) [ 885.232751] vfs_writev (fs/read_write.c:848) [ 885.234490] SyS_writev (fs/read_write.c:881 fs/read_write.c:872) [ 885.236473] ? SyS_readv (fs/read_write.c:872) [ 885.238300] ? syscall_trace_enter_phase2 (arch/x86/kernel/ptrace.c:1592) [ 885.240677] ? trace_hardirqs_on_thunk (arch/x86/lib/thunk_64.S:42) [ 885.242909] tracesys_phase2 (arch/x86/kernel/entry_64.S:337) [ 885.246363] ---[ end trace 957b1b1a507acb42 ]--- Thanks, Sasha -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>