lowmemorykiller: Killing 'syz-executor.5' (3303) (tgid 3303), adj 1000, to free 36016kB on behalf of 'kswapd0' (33) because cache 61000kB is below limit 65536kB for oom_score_adj 12 Free memory is -12400kB above reserved BUG: sleeping function called from invalid context at kernel/fork.c:905 in_atomic(): 0, irqs_disabled(): 0, pid: 33, name: kswapd0 2 locks held by kswapd0/33: #0: (shrinker_rwsem){++++..}, at: [<00000000b6f6f95e>] shrink_slab.part.0+0xb2/0xa20 mm/vmscan.c:472 #1: (rcu_read_lock){......}, at: [<00000000e9d87002>] lowmem_scan+0x242/0xb50 drivers/staging/android/lowmemorykiller.c:272 Preemption disabled at: [<00000000797a876a>] spin_lock include/linux/spinlock.h:302 [inline] [<00000000797a876a>] task_lock include/linux/sched.h:3217 [inline] [<00000000797a876a>] get_task_mm+0x20/0xc0 kernel/fork.c:1012 CPU: 1 PID: 33 Comm: kswapd0 Not tainted 4.9.189+ #22 ffff8801d840f7c0 ffffffff81b65c01 0000000000000000 0000000000000001 ffff8801d95817c0 ffffffff810d1010 ffff8801d95817c0 ffff8801d840f7f8 ffffffff814018f3 ffff8801d95817c0 ffffffff82a39fc0 0000000000000389 Call Trace: [<000000008c283f8f>] __dump_stack lib/dump_stack.c:15 [inline] [<000000008c283f8f>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<000000006918f238>] ___might_sleep.cold+0x1c1/0x1fa kernel/sched/core.c:8004 [<00000000c3a2315e>] __might_sleep+0x95/0x1a0 kernel/sched/core.c:7961 [<0000000038ae5f6e>] mmput+0x28/0x370 kernel/fork.c:905 [<0000000055ad9a7c>] handle_lmk_event+0xea/0x8a0 drivers/staging/android/lowmemorykiller.c:111 [<00000000708387f5>] lowmem_scan+0x695/0xb50 drivers/staging/android/lowmemorykiller.c:345 [<0000000019ee812b>] do_shrink_slab mm/vmscan.c:399 [inline] [<0000000019ee812b>] shrink_slab.part.0+0x3cf/0xa20 mm/vmscan.c:502 [<00000000970a6cea>] shrink_slab mm/vmscan.c:466 [inline] [<00000000970a6cea>] shrink_node+0x1ed/0x750 mm/vmscan.c:2604 [<000000009942393f>] kswapd_shrink_node mm/vmscan.c:3209 [inline] [<000000009942393f>] balance_pgdat mm/vmscan.c:3329 [inline] [<000000009942393f>] kswapd+0x7f8/0x13b0 mm/vmscan.c:3523 [<000000008b53ade7>] kthread+0x278/0x310 kernel/kthread.c:211 [<0000000002f34d0a>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 ================================= [ INFO: inconsistent lock state ] 4.9.189+ #22 Tainted: G W --------------------------------- inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-R} usage. kswapd0/33 [HC0[0]:SC0[0]:HE1:SE1] takes: (&mm->mmap_sem){+++++?}, at: [<00000000b9d05922>] get_cmdline+0xa3/0x2d0 mm/util.c:641 mark_held_locks+0xb1/0x100 kernel/locking/lockdep.c:2660 __lockdep_trace_alloc kernel/locking/lockdep.c:2882 [inline] lockdep_trace_alloc+0x18c/0x2b0 kernel/locking/lockdep.c:2897 __alloc_pages_nodemask+0x143/0x1a80 mm/page_alloc.c:3803 __alloc_pages include/linux/gfp.h:433 [inline] __alloc_pages_node include/linux/gfp.h:446 [inline] alloc_pages_node include/linux/gfp.h:460 [inline] pmd_alloc_one arch/x86/include/asm/pgalloc.h:88 [inline] __pmd_alloc+0x4a/0x330 mm/memory.c:3742 pmd_alloc include/linux/mm.h:1625 [inline] alloc_new_pmd mm/mremap.c:64 [inline] move_page_tables+0xadb/0xd60 mm/mremap.c:212 shift_arg_pages+0x1ae/0x470 fs/exec.c:642 setup_arg_pages+0x60d/0x7c0 fs/exec.c:754 load_elf_binary+0xa84/0x4a90 fs/binfmt_elf.c:860 search_binary_handler fs/exec.c:1621 [inline] search_binary_handler+0x14f/0x700 fs/exec.c:1599 exec_binprm fs/exec.c:1663 [inline] do_execveat_common.isra.0+0xf81/0x1db0 fs/exec.c:1785 do_execve+0x3a/0x50 fs/exec.c:1829 run_init_process+0x33/0x37 init/main.c:904 try_to_run_init_process+0x18/0x48 init/main.c:913 kernel_init+0xf2/0x163 init/main.c:984 ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:375 irq event stamp: 1303947 hardirqs last enabled at (1303947): [<00000000d93e857b>] dump_stack+0x100/0x120 lib/dump_stack.c:56 hardirqs last disabled at (1303946): [<00000000114b0c97>] dump_stack+0x2c/0x120 lib/dump_stack.c:38 softirqs last enabled at (1303904): [<0000000009efba5b>] __do_softirq+0x474/0x964 kernel/softirq.c:314 softirqs last disabled at (1303887): [<000000001eebdc83>] invoke_softirq kernel/softirq.c:368 [inline] softirqs last disabled at (1303887): [<000000001eebdc83>] irq_exit+0x119/0x160 kernel/softirq.c:409 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&mm->mmap_sem); lock(&mm->mmap_sem); *** DEADLOCK *** 3 locks held by kswapd0/33: #0: (shrinker_rwsem){++++..}, at: [<00000000b6f6f95e>] shrink_slab.part.0+0xb2/0xa20 mm/vmscan.c:472 #1: (rcu_read_lock){......}, at: [<00000000e9d87002>] lowmem_scan+0x242/0xb50 drivers/staging/android/lowmemorykiller.c:272 #2: (lmk_event_lock){+.+.-.}, at: [<000000004e8f0de1>] spin_lock include/linux/spinlock.h:302 [inline] #2: (lmk_event_lock){+.+.-.}, at: [<000000004e8f0de1>] handle_lmk_event+0xfb/0x8a0 drivers/staging/android/lowmemorykiller.c:114 stack backtrace: CPU: 1 PID: 33 Comm: kswapd0 Tainted: G W 4.9.189+ #22 ffff8801d840f500 ffffffff81b65c01 00000000000000f0 ffff8801d95817c0 ffffffff83caf950 ffff8801d9582108 ffffffff84250fc0 ffff8801d840f578 ffffffff81408330 0000000000000000 ffffffff00000001 0000000000000001 Call Trace: [<000000008c283f8f>] __dump_stack lib/dump_stack.c:15 [inline] [<000000008c283f8f>] dump_stack+0xc1/0x120 lib/dump_stack.c:51 [<00000000b55966cc>] print_usage_bug kernel/locking/lockdep.c:2387 [inline] [<00000000b55966cc>] print_usage_bug.cold+0x452/0x5a2 kernel/locking/lockdep.c:2354 [<00000000544ae9f3>] valid_state kernel/locking/lockdep.c:2400 [inline] [<00000000544ae9f3>] mark_lock_irq kernel/locking/lockdep.c:2602 [inline] [<00000000544ae9f3>] mark_lock+0x6c7/0x12e0 kernel/locking/lockdep.c:3065 [<00000000ecce8e60>] mark_irqflags kernel/locking/lockdep.c:2958 [inline] [<00000000ecce8e60>] __lock_acquire+0x5be/0x4390 kernel/locking/lockdep.c:3302 [<00000000c48dba16>] lock_acquire+0x133/0x3d0 kernel/locking/lockdep.c:3756 [<000000003ddc2500>] down_read+0x44/0xb0 kernel/locking/rwsem.c:22 [<00000000b9d05922>] get_cmdline+0xa3/0x2d0 mm/util.c:641 [<00000000c5628c8b>] handle_lmk_event+0x13c/0x8a0 drivers/staging/android/lowmemorykiller.c:128 [<00000000708387f5>] lowmem_scan+0x695/0xb50 drivers/staging/android/lowmemorykiller.c:345 [<0000000019ee812b>] do_shrink_slab mm/vmscan.c:399 [inline] [<0000000019ee812b>] shrink_slab.part.0+0x3cf/0xa20 mm/vmscan.c:502 [<00000000970a6cea>] shrink_slab mm/vmscan.c:466 [inline] [<00000000970a6cea>] shrink_node+0x1ed/0x750 mm/vmscan.c:2604 [<000000009942393f>] kswapd_shrink_node mm/vmscan.c:3209 [inline] [<000000009942393f>] balance_pgdat mm/vmscan.c:3329 [inline] [<000000009942393f>] kswapd+0x7f8/0x13b0 mm/vmscan.c:3523