[Samsung Galaxy Ace 3] ChipKng:
Yes, I've tried clean install, CM13, RR, no apps, everything. Seems this alarm clue was a wrong way.

Just had a crash when the phone was in active use:

[ 5003.983518] kill_fasync: bad magic number in fasync_struct!
[ 5003.983548] kill_fasync: bad magic number in fasync_struct!
[ 5004.043490] kill_fasync: bad magic number in fasync_struct!
[ 5004.058170] Unable to handle kernel paging request at virtual address 74f37d91
[ 5004.064549] pgd = d6034000
[ 5004.067143] [74f37d91] *pgd=00000000
[ 5004.070714] Internal error: Oops: 5 [#1] PREEMPT SMP ARM
[ 5004.076086] Modules linked in: adsprpc
[ 5004.079748] CPU: 0 Tainted: G W (3.4.113-g9966092 #1)
[ 5004.085975] PC is at kill_fasync+0x30/0xa8
[ 5004.090156] LR is at kill_fasync+0x20/0xa8
[...]
[ 5004.748419] [<c015b5dc>] (kill_fasync+0x30/0xa8) from [<c03bea14>] (add_interrupt_randomness+0x188/0x1a8)
[ 5004.758033] [<c03bea14>] (add_interrupt_randomness+0x188/0x1a8) from [<c00e8a98>] (handle_irq_event_percpu+0x1d0/0x2b4)
[ 5004.768776] [<c00e8a98>] (handle_irq_event_percpu+0x1d0/0x2b4) from [<c00e8bb8>] (handle_irq_event+0x3c/0x5c)
[ 5004.778695] [<c00e8bb8>] (handle_irq_event+0x3c/0x5c) from [<c00eb8c8>] (handle_fasteoi_irq+0xe0/0x14c)
[ 5004.788065] [<c00eb8c8>] (handle_fasteoi_irq+0xe0/0x14c) from [<c00e8164>] (generic_handle_irq+0x20/0x30)
[ 5004.797618] [<c00e8164>] (generic_handle_irq+0x20/0x30) from [<c000e7d8>] (handle_IRQ+0xa4/0xe4)
[ 5004.806286] [<c000e7d8>] (handle_IRQ+0xa4/0xe4) from [<c0008668>] (gic_handle_irq+0xcc/0x17c)
[ 5004.814893] [<c0008668>] (gic_handle_irq+0xcc/0x17c) from [<c000da80>] (__irq_svc+0x40/0x74)
[ 5004.823286] Exception stack(0xd61eff68 to 0xd61effb0)
[ 5004.828230] ff60: edde0b00 b6bab1e8 b6b467d0 60070030 00000000 0000edde
[ 5004.836501] ff80: d61ee050 00000001 00000b00 c000de54 d61ee000 00000001 b6baa770 d61effb0
[ 5004.844650] ffa0: c000de04 c000968c 00070013 ffffffff
[ 5004.849594] [<c000da80>] (__irq_svc+0x40/0x74) from [<c000968c>] (do_vfp+0x10/0x20)
[ 5004.857316] [<c000968c>] (do_vfp+0x10/0x20) from [<00000000>] ( (null))
[ 5004.864000] Code: e5944000 e3047601 e3540000 0a00001a (e5943004)
[ 5004.870012] ---[ end trace 83006a5a525934f3 ]---
[ 5004.874682] Kernel panic - not syncing: Fatal exception in interrupt
[ 5004.880939] CPU1: stopping
[ 5004.883624] [<c0013c88>] (unwind_backtrace+0x0/0xec) from [<c0013040>] (handle_IPI+0x124/0x200)
[ 5004.892384] [<c0013040>] (handle_IPI+0x124/0x200) from [<c00086e0>] (gic_handle_irq+0x144/0x17c)
[ 5004.901174] [<c00086e0>] (gic_handle_irq+0x144/0x17c) from [<c000da80>] (__irq_svc+0x40/0x74)
[ 5004.909658] Exception stack(0xd8d11d58 to 0xd8d11da0)
[ 5004.914603] 1d40: 00000001 00000020
[ 5004.922874] 1d60: d8d11e08 00002e81 d8d11e04 e6ff0e0f e6fed028 c0b78b9f 00007fd8 c0dc680c
[ 5004.931023] 1d80: e6ff5000 c0b78b9e d8d11db8 d8d11da0 c030c098 c030c1bc 80000013 ffffffff
[ 5004.939110] [<c000da80>] (__irq_svc+0x40/0x74) from [<c030c1bc>] (vsnprintf+0x1d0/0x380)
[ 5004.947259] [<c030c1bc>] (vsnprintf+0x1d0/0x380) from [<c0169e54>] (seq_printf+0x44/0x70)
[ 5004.955408] [<c0169e54>] (seq_printf+0x44/0x70) from [<c019238c>] (show_map_vma+0x1ec/0x278)
[ 5004.963740] [<c019238c>] (show_map_vma+0x1ec/0x278) from [<c0192764>] (show_smap+0x84/0x1d8)
[ 5004.972256] [<c0192764>] (show_smap+0x84/0x1d8) from [<c0169864>] (seq_read+0x1b0/0x428)
[ 5004.980344] [<c0169864>] (seq_read+0x1b0/0x428) from [<c014ce70>] (vfs_read+0xac/0x12c)
[ 5004.988309] [<c014ce70>] (vfs_read+0xac/0x12c) from [<c014d1d8>] (sys_read+0x38/0x64)
[ 5004.996031] [<c014d1d8>] (sys_read+0x38/0x64) from [<c000e024>] (__sys_trace_return+0x0/0x1c)
[ 5005.104836] Rebooting in 5 seconds..
[ 5010.108315] Going down for restart now
[ 5010.111429] msm_restart : clear reset flag

No errors detected

The log is full with "[ 5004.043490] kill_fasync: bad magic number in fasync_struct!" messages.