1. 12 Dec, 2015 1 commit
  2. 24 Jun, 2015 1 commit
    • Larry Finger's avatar
      mm: kmemleak_alloc_percpu() should follow the gfp from per_alloc() · 8a8c35fa
      Larry Finger authored
      Beginning at commit d52d3997 ("ipv6: Create percpu rt6_info"), the
      following INFO splat is logged:
      
        ===============================
        [ INFO: suspicious RCU usage. ]
        4.1.0-rc7-next-20150612 #1 Not tainted
        -------------------------------
        kernel/sched/core.c:7318 Illegal context switch in RCU-bh read-side critical section!
        other info that might help us debug this:
        rcu_scheduler_active = 1, debug_locks = 0
         3 locks held by systemd/1:
         #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff815f0c8f>] rtnetlink_rcv+0x1f/0x40
         #1:  (rcu_read_lock_bh){......}, at: [<ffffffff816a34e2>] ipv6_add_addr+0x62/0x540
         #2:  (addrconf_hash_lock){+...+.}, at: [<ffffffff816a3604>] ipv6_add_addr+0x184/0x540
        stack backtrace:
        CPU: 0 PID: 1 Comm: systemd Not tainted 4.1.0-rc7-next-20150612 #1
        Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.20   04/17/2014
        Call Trace:
          dump_stack+0x4c/0x6e
          lockdep_rcu_suspicious+0xe7/0x120
          ___might_sleep+0x1d5/0x1f0
          __might_sleep+0x4d/0x90
          kmem_cache_alloc+0x47/0x250
          create_object+0x39/0x2e0
          kmemleak_alloc_percpu+0x61/0xe0
          pcpu_alloc+0x370/0x630
      
      Additional backtrace lines are truncated.  In addition, the above splat
      is followed by several "BUG: sleeping function called from invalid
      context at mm/slub.c:1268" outputs.  As suggested by Martin KaFai Lau,
      these are the clue to the fix.  Routine kmemleak_alloc_percpu() always
      uses GFP_KERNEL for its allocations, whereas it should follow the gfp
      from its callers.
      Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Reviewed-by: default avatarKamalesh Babulal <kamalesh@linux.vnet.ibm.com>
      Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
      Signed-off-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
      Cc: Martin KaFai Lau <kafai@fb.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Christoph Lameter <cl@linux-foundation.org>
      Cc: <stable@vger.kernel.org>	[3.18+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8a8c35fa
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